diff options
Diffstat (limited to 'diff.c')
| -rw-r--r-- | diff.c | 3785 |
1 files changed, 3785 insertions, 0 deletions
diff --git a/diff.c b/diff.c new file mode 100644 index 0000000000..d952686926 --- /dev/null +++ b/diff.c @@ -0,0 +1,3785 @@ +/* + * Copyright (C) 2005 Junio C Hamano + */ +#include "cache.h" +#include "quote.h" +#include "diff.h" +#include "diffcore.h" +#include "delta.h" +#include "xdiff-interface.h" +#include "color.h" +#include "attr.h" +#include "run-command.h" +#include "utf8.h" +#include "userdiff.h" +#include "sigchain.h" +#include "submodule.h" + +#ifdef NO_FAST_WORKING_DIRECTORY +#define FAST_WORKING_DIRECTORY 0 +#else +#define FAST_WORKING_DIRECTORY 1 +#endif + +static int diff_detect_rename_default; +static int diff_rename_limit_default = 200; +static int diff_suppress_blank_empty; +int diff_use_color_default = -1; +static const char *diff_word_regex_cfg; +static const char *external_diff_cmd_cfg; +int diff_auto_refresh_index = 1; +static int diff_mnemonic_prefix; + +static char diff_colors[][COLOR_MAXLEN] = { + GIT_COLOR_RESET, + GIT_COLOR_NORMAL, /* PLAIN */ + GIT_COLOR_BOLD, /* METAINFO */ + GIT_COLOR_CYAN, /* FRAGINFO */ + GIT_COLOR_RED, /* OLD */ + GIT_COLOR_GREEN, /* NEW */ + GIT_COLOR_YELLOW, /* COMMIT */ + GIT_COLOR_BG_RED, /* WHITESPACE */ + GIT_COLOR_NORMAL, /* FUNCINFO */ +}; + +static void diff_filespec_load_driver(struct diff_filespec *one); +static char *run_textconv(const char *, struct diff_filespec *, size_t *); + +static int parse_diff_color_slot(const char *var, int ofs) +{ + if (!strcasecmp(var+ofs, "plain")) + return DIFF_PLAIN; + if (!strcasecmp(var+ofs, "meta")) + return DIFF_METAINFO; + if (!strcasecmp(var+ofs, "frag")) + return DIFF_FRAGINFO; + if (!strcasecmp(var+ofs, "old")) + return DIFF_FILE_OLD; + if (!strcasecmp(var+ofs, "new")) + return DIFF_FILE_NEW; + if (!strcasecmp(var+ofs, "commit")) + return DIFF_COMMIT; + if (!strcasecmp(var+ofs, "whitespace")) + return DIFF_WHITESPACE; + if (!strcasecmp(var+ofs, "func")) + return DIFF_FUNCINFO; + die("bad config variable '%s'", var); +} + +static int git_config_rename(const char *var, const char *value) +{ + if (!value) + return DIFF_DETECT_RENAME; + if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy")) + return DIFF_DETECT_COPY; + return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0; +} + +/* + * These are to give UI layer defaults. + * The core-level commands such as git-diff-files should + * never be affected by the setting of diff.renames + * the user happens to have in the configuration file. + */ +int git_diff_ui_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) { + diff_use_color_default = git_config_colorbool(var, value, -1); + return 0; + } + if (!strcmp(var, "diff.renames")) { + diff_detect_rename_default = git_config_rename(var, value); + return 0; + } + if (!strcmp(var, "diff.autorefreshindex")) { + diff_auto_refresh_index = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.mnemonicprefix")) { + diff_mnemonic_prefix = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "diff.external")) + return git_config_string(&external_diff_cmd_cfg, var, value); + if (!strcmp(var, "diff.wordregex")) + return git_config_string(&diff_word_regex_cfg, var, value); + + return git_diff_basic_config(var, value, cb); +} + +int git_diff_basic_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "diff.renamelimit")) { + diff_rename_limit_default = git_config_int(var, value); + return 0; + } + + switch (userdiff_config(var, value)) { + case 0: break; + case -1: return -1; + default: return 0; + } + + if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) { + int slot = parse_diff_color_slot(var, 11); + if (!value) + return config_error_nonbool(var); + color_parse(value, var, diff_colors[slot]); + return 0; + } + + /* like GNU diff's --suppress-blank-empty option */ + if (!strcmp(var, "diff.suppressblankempty") || + /* for backwards compatibility */ + !strcmp(var, "diff.suppress-blank-empty")) { + diff_suppress_blank_empty = git_config_bool(var, value); + return 0; + } + + return git_color_default_config(var, value, cb); +} + +static char *quote_two(const char *one, const char *two) +{ + int need_one = quote_c_style(one, NULL, NULL, 1); + int need_two = quote_c_style(two, NULL, NULL, 1); + struct strbuf res = STRBUF_INIT; + + if (need_one + need_two) { + strbuf_addch(&res, '"'); + quote_c_style(one, &res, NULL, 1); + quote_c_style(two, &res, NULL, 1); + strbuf_addch(&res, '"'); + } else { + strbuf_addstr(&res, one); + strbuf_addstr(&res, two); + } + return strbuf_detach(&res, NULL); +} + +static const char *external_diff(void) +{ + static const char *external_diff_cmd = NULL; + static int done_preparing = 0; + + if (done_preparing) + return external_diff_cmd; + external_diff_cmd = getenv("GIT_EXTERNAL_DIFF"); + if (!external_diff_cmd) + external_diff_cmd = external_diff_cmd_cfg; + done_preparing = 1; + return external_diff_cmd; +} + +static struct diff_tempfile { + const char *name; /* filename external diff should read from */ + char hex[41]; + char mode[10]; + char tmp_path[PATH_MAX]; +} diff_temp[2]; + +typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len); + +struct emit_callback { + int color_diff; + unsigned ws_rule; + int blank_at_eof_in_preimage; + int blank_at_eof_in_postimage; + int lno_in_preimage; + int lno_in_postimage; + sane_truncate_fn truncate; + const char **label_path; + struct diff_words_data *diff_words; + int *found_changesp; + FILE *file; +}; + +static int count_lines(const char *data, int size) +{ + int count, ch, completely_empty = 1, nl_just_seen = 0; + count = 0; + while (0 < size--) { + ch = *data++; + if (ch == '\n') { + count++; + nl_just_seen = 1; + completely_empty = 0; + } + else { + nl_just_seen = 0; + completely_empty = 0; + } + } + if (completely_empty) + return 0; + if (!nl_just_seen) + count++; /* no trailing newline */ + return count; +} + +static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) { + mf->ptr = (char *)""; /* does not matter */ + mf->size = 0; + return 0; + } + else if (diff_populate_filespec(one, 0)) + return -1; + + mf->ptr = one->data; + mf->size = one->size; + return 0; +} + +static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule) +{ + char *ptr = mf->ptr; + long size = mf->size; + int cnt = 0; + + if (!size) + return cnt; + ptr += size - 1; /* pointing at the very end */ + if (*ptr != '\n') + ; /* incomplete line */ + else + ptr--; /* skip the last LF */ + while (mf->ptr < ptr) { + char *prev_eol; + for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--) + if (*prev_eol == '\n') + break; + if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule)) + break; + cnt++; + ptr = prev_eol - 1; + } + return cnt; +} + +static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2, + struct emit_callback *ecbdata) +{ + int l1, l2, at; + unsigned ws_rule = ecbdata->ws_rule; + l1 = count_trailing_blank(mf1, ws_rule); + l2 = count_trailing_blank(mf2, ws_rule); + if (l2 <= l1) { + ecbdata->blank_at_eof_in_preimage = 0; + ecbdata->blank_at_eof_in_postimage = 0; + return; + } + at = count_lines(mf1->ptr, mf1->size); + ecbdata->blank_at_eof_in_preimage = (at - l1) + 1; + + at = count_lines(mf2->ptr, mf2->size); + ecbdata->blank_at_eof_in_postimage = (at - l2) + 1; +} + +static void emit_line_0(FILE *file, const char *set, const char *reset, + int first, const char *line, int len) +{ + int has_trailing_newline, has_trailing_carriage_return; + int nofirst; + + if (len == 0) { + has_trailing_newline = (first == '\n'); + has_trailing_carriage_return = (!has_trailing_newline && + (first == '\r')); + nofirst = has_trailing_newline || has_trailing_carriage_return; + } else { + has_trailing_newline = (len > 0 && line[len-1] == '\n'); + if (has_trailing_newline) + len--; + has_trailing_carriage_return = (len > 0 && line[len-1] == '\r'); + if (has_trailing_carriage_return) + len--; + nofirst = 0; + } + + if (len || !nofirst) { + fputs(set, file); + if (!nofirst) + fputc(first, file); + fwrite(line, len, 1, file); + fputs(reset, file); + } + if (has_trailing_carriage_return) + fputc('\r', file); + if (has_trailing_newline) + fputc('\n', file); +} + +static void emit_line(FILE *file, const char *set, const char *reset, + const char *line, int len) +{ + emit_line_0(file, set, reset, line[0], line+1, len-1); +} + +static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len) +{ + if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) && + ecbdata->blank_at_eof_in_preimage && + ecbdata->blank_at_eof_in_postimage && + ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage && + ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage)) + return 0; + return ws_blank_line(line, len, ecbdata->ws_rule); +} + +static void emit_add_line(const char *reset, + struct emit_callback *ecbdata, + const char *line, int len) +{ + const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE); + const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW); + + if (!*ws) + emit_line_0(ecbdata->file, set, reset, '+', line, len); + else if (new_blank_line_at_eof(ecbdata, line, len)) + /* Blank line at EOF - paint '+' as well */ + emit_line_0(ecbdata->file, ws, reset, '+', line, len); + else { + /* Emit just the prefix, then the rest. */ + emit_line_0(ecbdata->file, set, reset, '+', "", 0); + ws_check_emit(line, len, ecbdata->ws_rule, + ecbdata->file, set, reset, ws); + } +} + +static void emit_hunk_header(struct emit_callback *ecbdata, + const char *line, int len) +{ + const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN); + const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO); + const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO); + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + static const char atat[2] = { '@', '@' }; + const char *cp, *ep; + + /* + * As a hunk header must begin with "@@ -<old>, +<new> @@", + * it always is at least 10 bytes long. + */ + if (len < 10 || + memcmp(line, atat, 2) || + !(ep = memmem(line + 2, len - 2, atat, 2))) { + emit_line(ecbdata->file, plain, reset, line, len); + return; + } + ep += 2; /* skip over @@ */ + + /* The hunk header in fraginfo color */ + emit_line(ecbdata->file, frag, reset, line, ep - line); + + /* blank before the func header */ + for (cp = ep; ep - line < len; ep++) + if (*ep != ' ' && *ep != '\t') + break; + if (ep != cp) + emit_line(ecbdata->file, plain, reset, cp, ep - cp); + + if (ep < line + len) + emit_line(ecbdata->file, func, reset, ep, line + len - ep); +} + +static struct diff_tempfile *claim_diff_tempfile(void) { + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) + if (!diff_temp[i].name) + return diff_temp + i; + die("BUG: diff is failing to clean up its tempfiles"); +} + +static int remove_tempfile_installed; + +static void remove_tempfile(void) +{ + int i; + for (i = 0; i < ARRAY_SIZE(diff_temp); i++) { + if (diff_temp[i].name == diff_temp[i].tmp_path) + unlink_or_warn(diff_temp[i].name); + diff_temp[i].name = NULL; + } +} + +static void remove_tempfile_on_signal(int signo) +{ + remove_tempfile(); + sigchain_pop(signo); + raise(signo); +} + +static void print_line_count(FILE *file, int count) +{ + switch (count) { + case 0: + fprintf(file, "0,0"); + break; + case 1: + fprintf(file, "1"); + break; + default: + fprintf(file, "1,%d", count); + break; + } +} + +static void emit_rewrite_lines(struct emit_callback *ecb, + int prefix, const char *data, int size) +{ + const char *endp = NULL; + static const char *nneof = " No newline at end of file\n"; + const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD); + const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET); + + while (0 < size) { + int len; + + endp = memchr(data, '\n', size); + len = endp ? (endp - data + 1) : size; + if (prefix != '+') { + ecb->lno_in_preimage++; + emit_line_0(ecb->file, old, reset, '-', + data, len); + } else { + ecb->lno_in_postimage++; + emit_add_line(reset, ecb, data, len); + } + size -= len; + data += len; + } + if (!endp) { + const char *plain = diff_get_color(ecb->color_diff, + DIFF_PLAIN); + emit_line_0(ecb->file, plain, reset, '\\', + nneof, strlen(nneof)); + } +} + +static void emit_rewrite_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + const char *textconv_one, + const char *textconv_two, + struct diff_options *o) +{ + int lc_a, lc_b; + int color_diff = DIFF_OPT_TST(o, COLOR_DIFF); + const char *name_a_tab, *name_b_tab; + const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO); + const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO); + const char *reset = diff_get_color(color_diff, DIFF_RESET); + static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT; + const char *a_prefix, *b_prefix; + const char *data_one, *data_two; + size_t size_one, size_two; + struct emit_callback ecbdata; + + if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + name_a += (*name_a == '/'); + name_b += (*name_b == '/'); + name_a_tab = strchr(name_a, ' ') ? "\t" : ""; + name_b_tab = strchr(name_b, ' ') ? "\t" : ""; + + strbuf_reset(&a_name); + strbuf_reset(&b_name); + quote_two_c_style(&a_name, a_prefix, name_a, 0); + quote_two_c_style(&b_name, b_prefix, name_b, 0); + + diff_populate_filespec(one, 0); + diff_populate_filespec(two, 0); + if (textconv_one) { + data_one = run_textconv(textconv_one, one, &size_one); + if (!data_one) + die("unable to read files to diff"); + } + else { + data_one = one->data; + size_one = one->size; + } + if (textconv_two) { + data_two = run_textconv(textconv_two, two, &size_two); + if (!data_two) + die("unable to read files to diff"); + } + else { + data_two = two->data; + size_two = two->size; + } + + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.color_diff = color_diff; + ecbdata.found_changesp = &o->found_changes; + ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); + ecbdata.file = o->file; + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) { + mmfile_t mf1, mf2; + mf1.ptr = (char *)data_one; + mf2.ptr = (char *)data_two; + mf1.size = size_one; + mf2.size = size_two; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + } + ecbdata.lno_in_preimage = 1; + ecbdata.lno_in_postimage = 1; + + lc_a = count_lines(data_one, size_one); + lc_b = count_lines(data_two, size_two); + fprintf(o->file, + "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -", + metainfo, a_name.buf, name_a_tab, reset, + metainfo, b_name.buf, name_b_tab, reset, fraginfo); + print_line_count(o->file, lc_a); + fprintf(o->file, " +"); + print_line_count(o->file, lc_b); + fprintf(o->file, " @@%s\n", reset); + if (lc_a) + emit_rewrite_lines(&ecbdata, '-', data_one, size_one); + if (lc_b) + emit_rewrite_lines(&ecbdata, '+', data_two, size_two); +} + +struct diff_words_buffer { + mmfile_t text; + long alloc; + struct diff_words_orig { + const char *begin, *end; + } *orig; + int orig_nr, orig_alloc; +}; + +static void diff_words_append(char *line, unsigned long len, + struct diff_words_buffer *buffer) +{ + ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc); + line++; + len--; + memcpy(buffer->text.ptr + buffer->text.size, line, len); + buffer->text.size += len; + buffer->text.ptr[buffer->text.size] = '\0'; +} + +struct diff_words_data { + struct diff_words_buffer minus, plus; + const char *current_plus; + FILE *file; + regex_t *word_regex; +}; + +static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len) +{ + struct diff_words_data *diff_words = priv; + int minus_first, minus_len, plus_first, plus_len; + const char *minus_begin, *minus_end, *plus_begin, *plus_end; + + if (line[0] != '@' || parse_hunk_header(line, len, + &minus_first, &minus_len, &plus_first, &plus_len)) + return; + + /* POSIX requires that first be decremented by one if len == 0... */ + if (minus_len) { + minus_begin = diff_words->minus.orig[minus_first].begin; + minus_end = + diff_words->minus.orig[minus_first + minus_len - 1].end; + } else + minus_begin = minus_end = + diff_words->minus.orig[minus_first].end; + + if (plus_len) { + plus_begin = diff_words->plus.orig[plus_first].begin; + plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end; + } else + plus_begin = plus_end = diff_words->plus.orig[plus_first].end; + + if (diff_words->current_plus != plus_begin) + fwrite(diff_words->current_plus, + plus_begin - diff_words->current_plus, 1, + diff_words->file); + if (minus_begin != minus_end) + color_fwrite_lines(diff_words->file, + diff_get_color(1, DIFF_FILE_OLD), + minus_end - minus_begin, minus_begin); + if (plus_begin != plus_end) + color_fwrite_lines(diff_words->file, + diff_get_color(1, DIFF_FILE_NEW), + plus_end - plus_begin, plus_begin); + + diff_words->current_plus = plus_end; +} + +/* This function starts looking at *begin, and returns 0 iff a word was found. */ +static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex, + int *begin, int *end) +{ + if (word_regex && *begin < buffer->size) { + regmatch_t match[1]; + if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) { + char *p = memchr(buffer->ptr + *begin + match[0].rm_so, + '\n', match[0].rm_eo - match[0].rm_so); + *end = p ? p - buffer->ptr : match[0].rm_eo + *begin; + *begin += match[0].rm_so; + return *begin >= *end; + } + return -1; + } + + /* find the next word */ + while (*begin < buffer->size && isspace(buffer->ptr[*begin])) + (*begin)++; + if (*begin >= buffer->size) + return -1; + + /* find the end of the word */ + *end = *begin + 1; + while (*end < buffer->size && !isspace(buffer->ptr[*end])) + (*end)++; + + return 0; +} + +/* + * This function splits the words in buffer->text, stores the list with + * newline separator into out, and saves the offsets of the original words + * in buffer->orig. + */ +static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out, + regex_t *word_regex) +{ + int i, j; + long alloc = 0; + + out->size = 0; + out->ptr = NULL; + + /* fake an empty "0th" word */ + ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc); + buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr; + buffer->orig_nr = 1; + + for (i = 0; i < buffer->text.size; i++) { + if (find_word_boundaries(&buffer->text, word_regex, &i, &j)) + return; + + /* store original boundaries */ + ALLOC_GROW(buffer->orig, buffer->orig_nr + 1, + buffer->orig_alloc); + buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i; + buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j; + buffer->orig_nr++; + + /* store one word */ + ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc); + memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i); + out->ptr[out->size + j - i] = '\n'; + out->size += j - i + 1; + + i = j - 1; + } +} + +/* this executes the word diff on the accumulated buffers */ +static void diff_words_show(struct diff_words_data *diff_words) +{ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + mmfile_t minus, plus; + + /* special case: only removal */ + if (!diff_words->plus.text.size) { + color_fwrite_lines(diff_words->file, + diff_get_color(1, DIFF_FILE_OLD), + diff_words->minus.text.size, diff_words->minus.text.ptr); + diff_words->minus.text.size = 0; + return; + } + + diff_words->current_plus = diff_words->plus.text.ptr; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex); + diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex); + xpp.flags = XDF_NEED_MINIMAL; + /* as only the hunk header will be parsed, we need a 0-context */ + xecfg.ctxlen = 0; + xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words, + &xpp, &xecfg, &ecb); + free(minus.ptr); + free(plus.ptr); + if (diff_words->current_plus != diff_words->plus.text.ptr + + diff_words->plus.text.size) + fwrite(diff_words->current_plus, + diff_words->plus.text.ptr + diff_words->plus.text.size + - diff_words->current_plus, 1, + diff_words->file); + diff_words->minus.text.size = diff_words->plus.text.size = 0; +} + +/* In "color-words" mode, show word-diff of words accumulated in the buffer */ +static void diff_words_flush(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words->minus.text.size || + ecbdata->diff_words->plus.text.size) + diff_words_show(ecbdata->diff_words); +} + +static void free_diff_words_data(struct emit_callback *ecbdata) +{ + if (ecbdata->diff_words) { + diff_words_flush(ecbdata); + free (ecbdata->diff_words->minus.text.ptr); + free (ecbdata->diff_words->minus.orig); + free (ecbdata->diff_words->plus.text.ptr); + free (ecbdata->diff_words->plus.orig); + free(ecbdata->diff_words->word_regex); + free(ecbdata->diff_words); + ecbdata->diff_words = NULL; + } +} + +const char *diff_get_color(int diff_use_color, enum color_diff ix) +{ + if (diff_use_color) + return diff_colors[ix]; + return ""; +} + +static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len) +{ + const char *cp; + unsigned long allot; + size_t l = len; + + if (ecb->truncate) + return ecb->truncate(line, len); + cp = line; + allot = l; + while (0 < l) { + (void) utf8_width(&cp, &l); + if (!cp) + break; /* truncated in the middle? */ + } + return allot - l; +} + +static void find_lno(const char *line, struct emit_callback *ecbdata) +{ + const char *p; + ecbdata->lno_in_preimage = 0; + ecbdata->lno_in_postimage = 0; + p = strchr(line, '-'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10); + p = strchr(p, '+'); + if (!p) + return; /* cannot happen */ + ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10); +} + +static void fn_out_consume(void *priv, char *line, unsigned long len) +{ + struct emit_callback *ecbdata = priv; + const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO); + const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN); + const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET); + + *(ecbdata->found_changesp) = 1; + + if (ecbdata->label_path[0]) { + const char *name_a_tab, *name_b_tab; + + name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : ""; + name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : ""; + + fprintf(ecbdata->file, "%s--- %s%s%s\n", + meta, ecbdata->label_path[0], reset, name_a_tab); + fprintf(ecbdata->file, "%s+++ %s%s%s\n", + meta, ecbdata->label_path[1], reset, name_b_tab); + ecbdata->label_path[0] = ecbdata->label_path[1] = NULL; + } + + if (diff_suppress_blank_empty + && len == 2 && line[0] == ' ' && line[1] == '\n') { + line[0] = '\n'; + len = 1; + } + + if (line[0] == '@') { + if (ecbdata->diff_words) + diff_words_flush(ecbdata); + len = sane_truncate_line(ecbdata, line, len); + find_lno(line, ecbdata); + emit_hunk_header(ecbdata, line, len); + if (line[len-1] != '\n') + putc('\n', ecbdata->file); + return; + } + + if (len < 1) { + emit_line(ecbdata->file, reset, reset, line, len); + return; + } + + if (ecbdata->diff_words) { + if (line[0] == '-') { + diff_words_append(line, len, + &ecbdata->diff_words->minus); + return; + } else if (line[0] == '+') { + diff_words_append(line, len, + &ecbdata->diff_words->plus); + return; + } + diff_words_flush(ecbdata); + line++; + len--; + emit_line(ecbdata->file, plain, reset, line, len); + return; + } + + if (line[0] != '+') { + const char *color = + diff_get_color(ecbdata->color_diff, + line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN); + ecbdata->lno_in_preimage++; + if (line[0] == ' ') + ecbdata->lno_in_postimage++; + emit_line(ecbdata->file, color, reset, line, len); + } else { + ecbdata->lno_in_postimage++; + emit_add_line(reset, ecbdata, line + 1, len - 1); + } +} + +static char *pprint_rename(const char *a, const char *b) +{ + const char *old = a; + const char *new = b; + struct strbuf name = STRBUF_INIT; + int pfx_length, sfx_length; + int len_a = strlen(a); + int len_b = strlen(b); + int a_midlen, b_midlen; + int qlen_a = quote_c_style(a, NULL, NULL, 0); + int qlen_b = quote_c_style(b, NULL, NULL, 0); + + if (qlen_a || qlen_b) { + quote_c_style(a, &name, NULL, 0); + strbuf_addstr(&name, " => "); + quote_c_style(b, &name, NULL, 0); + return strbuf_detach(&name, NULL); + } + + /* Find common prefix */ + pfx_length = 0; + while (*old && *new && *old == *new) { + if (*old == '/') + pfx_length = old - a + 1; + old++; + new++; + } + + /* Find common suffix */ + old = a + len_a; + new = b + len_b; + sfx_length = 0; + while (a <= old && b <= new && *old == *new) { + if (*old == '/') + sfx_length = len_a - (old - a); + old--; + new--; + } + + /* + * pfx{mid-a => mid-b}sfx + * {pfx-a => pfx-b}sfx + * pfx{sfx-a => sfx-b} + * name-a => name-b + */ + a_midlen = len_a - pfx_length - sfx_length; + b_midlen = len_b - pfx_length - sfx_length; + if (a_midlen < 0) + a_midlen = 0; + if (b_midlen < 0) + b_midlen = 0; + + strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7); + if (pfx_length + sfx_length) { + strbuf_add(&name, a, pfx_length); + strbuf_addch(&name, '{'); + } + strbuf_add(&name, a + pfx_length, a_midlen); + strbuf_addstr(&name, " => "); + strbuf_add(&name, b + pfx_length, b_midlen); + if (pfx_length + sfx_length) { + strbuf_addch(&name, '}'); + strbuf_add(&name, a + len_a - sfx_length, sfx_length); + } + return strbuf_detach(&name, NULL); +} + +struct diffstat_t { + int nr; + int alloc; + struct diffstat_file { + char *from_name; + char *name; + char *print_name; + unsigned is_unmerged:1; + unsigned is_binary:1; + unsigned is_renamed:1; + unsigned int added, deleted; + } **files; +}; + +static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat, + const char *name_a, + const char *name_b) +{ + struct diffstat_file *x; + x = xcalloc(sizeof (*x), 1); + if (diffstat->nr == diffstat->alloc) { + diffstat->alloc = alloc_nr(diffstat->alloc); + diffstat->files = xrealloc(diffstat->files, + diffstat->alloc * sizeof(x)); + } + diffstat->files[diffstat->nr++] = x; + if (name_b) { + x->from_name = xstrdup(name_a); + x->name = xstrdup(name_b); + x->is_renamed = 1; + } + else { + x->from_name = NULL; + x->name = xstrdup(name_a); + } + return x; +} + +static void diffstat_consume(void *priv, char *line, unsigned long len) +{ + struct diffstat_t *diffstat = priv; + struct diffstat_file *x = diffstat->files[diffstat->nr - 1]; + + if (line[0] == '+') + x->added++; + else if (line[0] == '-') + x->deleted++; +} + +const char mime_boundary_leader[] = "------------"; + +static int scale_linear(int it, int width, int max_change) +{ + /* + * make sure that at least one '-' is printed if there were deletions, + * and likewise for '+'. + */ + if (max_change < 2) + return it; + return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1); +} + +static void show_name(FILE *file, + const char *prefix, const char *name, int len) +{ + fprintf(file, " %s%-*s |", prefix, len, name); +} + +static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset) +{ + if (cnt <= 0) + return; + fprintf(file, "%s", set); + while (cnt--) + putc(ch, file); + fprintf(file, "%s", reset); +} + +static void fill_print_name(struct diffstat_file *file) +{ + char *pname; + + if (file->print_name) + return; + + if (!file->is_renamed) { + struct strbuf buf = STRBUF_INIT; + if (quote_c_style(file->name, &buf, NULL, 0)) { + pname = strbuf_detach(&buf, NULL); + } else { + pname = file->name; + strbuf_release(&buf); + } + } else { + pname = pprint_rename(file->from_name, file->name); + } + file->print_name = pname; +} + +static void show_stats(struct diffstat_t *data, struct diff_options *options) +{ + int i, len, add, del, adds = 0, dels = 0; + int max_change = 0, max_len = 0; + int total_files = data->nr; + int width, name_width; + const char *reset, *set, *add_c, *del_c; + + if (data->nr == 0) + return; + + width = options->stat_width ? options->stat_width : 80; + name_width = options->stat_name_width ? options->stat_name_width : 50; + + /* Sanity: give at least 5 columns to the graph, + * but leave at least 10 columns for the name. + */ + if (width < 25) + width = 25; + if (name_width < 10) + name_width = 10; + else if (width < name_width + 15) + name_width = width - 15; + + /* Find the longest filename and max number of changes */ + reset = diff_get_color_opt(options, DIFF_RESET); + set = diff_get_color_opt(options, DIFF_PLAIN); + add_c = diff_get_color_opt(options, DIFF_FILE_NEW); + del_c = diff_get_color_opt(options, DIFF_FILE_OLD); + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + int change = file->added + file->deleted; + fill_print_name(file); + len = strlen(file->print_name); + if (max_len < len) + max_len = len; + + if (file->is_binary || file->is_unmerged) + continue; + if (max_change < change) + max_change = change; + } + + /* Compute the width of the graph part; + * 10 is for one blank at the beginning of the line plus + * " | count " between the name and the graph. + * + * From here on, name_width is the width of the name area, + * and width is the width of the graph area. + */ + name_width = (name_width < max_len) ? name_width : max_len; + if (width < (name_width + 10) + max_change) + width = width - (name_width + 10); + else + width = max_change; + + for (i = 0; i < data->nr; i++) { + const char *prefix = ""; + char *name = data->files[i]->print_name; + int added = data->files[i]->added; + int deleted = data->files[i]->deleted; + int name_len; + + /* + * "scale" the filename + */ + len = name_width; + name_len = strlen(name); + if (name_width < name_len) { + char *slash; + prefix = "..."; + len -= 3; + name += name_len - len; + slash = strchr(name, '/'); + if (slash) + name = slash; + } + + if (data->files[i]->is_binary) { + show_name(options->file, prefix, name, len); + fprintf(options->file, " Bin "); + fprintf(options->file, "%s%d%s", del_c, deleted, reset); + fprintf(options->file, " -> "); + fprintf(options->file, "%s%d%s", add_c, added, reset); + fprintf(options->file, " bytes"); + fprintf(options->file, "\n"); + continue; + } + else if (data->files[i]->is_unmerged) { + show_name(options->file, prefix, name, len); + fprintf(options->file, " Unmerged\n"); + continue; + } + else if (!data->files[i]->is_renamed && + (added + deleted == 0)) { + total_files--; + continue; + } + + /* + * scale the add/delete + */ + add = added; + del = deleted; + adds += add; + dels += del; + + if (width <= max_change) { + add = scale_linear(add, width, max_change); + del = scale_linear(del, width, max_change); + } + show_name(options->file, prefix, name, len); + fprintf(options->file, "%5d%s", added + deleted, + added + deleted ? " " : ""); + show_graph(options->file, '+', add, add_c, reset); + show_graph(options->file, '-', del, del_c, reset); + fprintf(options->file, "\n"); + } + fprintf(options->file, + " %d files changed, %d insertions(+), %d deletions(-)\n", + total_files, adds, dels); +} + +static void show_shortstats(struct diffstat_t *data, struct diff_options *options) +{ + int i, adds = 0, dels = 0, total_files = data->nr; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + if (!data->files[i]->is_binary && + !data->files[i]->is_unmerged) { + int added = data->files[i]->added; + int deleted= data->files[i]->deleted; + if (!data->files[i]->is_renamed && + (added + deleted == 0)) { + total_files--; + } else { + adds += added; + dels += deleted; + } + } + } + fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n", + total_files, adds, dels); +} + +static void show_numstat(struct diffstat_t *data, struct diff_options *options) +{ + int i; + + if (data->nr == 0) + return; + + for (i = 0; i < data->nr; i++) { + struct diffstat_file *file = data->files[i]; + + if (file->is_binary) + fprintf(options->file, "-\t-\t"); + else + fprintf(options->file, + "%d\t%d\t", file->added, file->deleted); + if (options->line_termination) { + fill_print_name(file); + if (!file->is_renamed) + write_name_quoted(file->name, options->file, + options->line_termination); + else { + fputs(file->print_name, options->file); + putc(options->line_termination, options->file); + } + } else { + if (file->is_renamed) { + putc('\0', options->file); + write_name_quoted(file->from_name, options->file, '\0'); + } + write_name_quoted(file->name, options->file, '\0'); + } + } +} + +struct dirstat_file { + const char *name; + unsigned long changed; +}; + +struct dirstat_dir { + struct dirstat_file *files; + int alloc, nr, percent, cumulative; +}; + +static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen) +{ + unsigned long this_dir = 0; + unsigned int sources = 0; + + while (dir->nr) { + struct dirstat_file *f = dir->files; + int namelen = strlen(f->name); + unsigned long this; + char *slash; + + if (namelen < baselen) + break; + if (memcmp(f->name, base, baselen)) + break; + slash = strchr(f->name + baselen, '/'); + if (slash) { + int newbaselen = slash + 1 - f->name; + this = gather_dirstat(file, dir, changed, f->name, newbaselen); + sources++; + } else { + this = f->changed; + dir->files++; + dir->nr--; + sources += 2; + } + this_dir += this; + } + + /* + * We don't report dirstat's for + * - the top level + * - or cases where everything came from a single directory + * under this directory (sources == 1). + */ + if (baselen && sources != 1) { + int permille = this_dir * 1000 / changed; + if (permille) { + int percent = permille / 10; + if (percent >= dir->percent) { + fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base); + if (!dir->cumulative) + return 0; + } + } + } + return this_dir; +} + +static int dirstat_compare(const void *_a, const void *_b) +{ + const struct dirstat_file *a = _a; + const struct dirstat_file *b = _b; + return strcmp(a->name, b->name); +} + +static void show_dirstat(struct diff_options *options) +{ + int i; + unsigned long changed; + struct dirstat_dir dir; + struct diff_queue_struct *q = &diff_queued_diff; + + dir.files = NULL; + dir.alloc = 0; + dir.nr = 0; + dir.percent = options->dirstat_percent; + dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE); + + changed = 0; + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + const char *name; + unsigned long copied, added, damage; + + name = p->one->path ? p->one->path : p->two->path; + + if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(p->one, 0); + diff_populate_filespec(p->two, 0); + diffcore_count_changes(p->one, p->two, NULL, NULL, 0, + &copied, &added); + diff_free_filespec_data(p->one); + diff_free_filespec_data(p->two); + } else if (DIFF_FILE_VALID(p->one)) { + diff_populate_filespec(p->one, 1); + copied = added = 0; + diff_free_filespec_data(p->one); + } else if (DIFF_FILE_VALID(p->two)) { + diff_populate_filespec(p->two, 1); + copied = 0; + added = p->two->size; + diff_free_filespec_data(p->two); + } else + continue; + + /* + * Original minus copied is the removed material, + * added is the new material. They are both damages + * made to the preimage. In --dirstat-by-file mode, count + * damaged files, not damaged lines. This is done by + * counting only a single damaged line per file. + */ + damage = (p->one->size - copied) + added; + if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0) + damage = 1; + + ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); + dir.files[dir.nr].name = name; + dir.files[dir.nr].changed = damage; + changed += damage; + dir.nr++; + } + + /* This can happen even with many files, if everything was renames */ + if (!changed) + return; + + /* Show all directories with more than x% of the changes */ + qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare); + gather_dirstat(options->file, &dir, changed, "", 0); +} + +static void free_diffstat_info(struct diffstat_t *diffstat) +{ + int i; + for (i = 0; i < diffstat->nr; i++) { + struct diffstat_file *f = diffstat->files[i]; + if (f->name != f->print_name) + free(f->print_name); + free(f->name); + free(f->from_name); + free(f); + } + free(diffstat->files); +} + +struct checkdiff_t { + const char *filename; + int lineno; + struct diff_options *o; + unsigned ws_rule; + unsigned status; +}; + +static int is_conflict_marker(const char *line, unsigned long len) +{ + char firstchar; + int cnt; + + if (len < 8) + return 0; + firstchar = line[0]; + switch (firstchar) { + case '=': case '>': case '<': + break; + default: + return 0; + } + for (cnt = 1; cnt < 7; cnt++) + if (line[cnt] != firstchar) + return 0; + /* line[0] thru line[6] are same as firstchar */ + if (firstchar == '=') { + /* divider between ours and theirs? */ + if (len != 8 || line[7] != '\n') + return 0; + } else if (len < 8 || !isspace(line[7])) { + /* not divider before ours nor after theirs */ + return 0; + } + return 1; +} + +static void checkdiff_consume(void *priv, char *line, unsigned long len) +{ + struct checkdiff_t *data = priv; + int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF); + const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE); + const char *reset = diff_get_color(color_diff, DIFF_RESET); + const char *set = diff_get_color(color_diff, DIFF_FILE_NEW); + char *err; + + if (line[0] == '+') { + unsigned bad; + data->lineno++; + if (is_conflict_marker(line + 1, len - 1)) { + data->status |= 1; + fprintf(data->o->file, + "%s:%d: leftover conflict marker\n", + data->filename, data->lineno); + } + bad = ws_check(line + 1, len - 1, data->ws_rule); + if (!bad) + return; + data->status |= bad; + err = whitespace_error_string(bad); + fprintf(data->o->file, "%s:%d: %s.\n", + data->filename, data->lineno, err); + free(err); + emit_line(data->o->file, set, reset, line, 1); + ws_check_emit(line + 1, len - 1, data->ws_rule, + data->o->file, set, reset, ws); + } else if (line[0] == ' ') { + data->lineno++; + } else if (line[0] == '@') { + char *plus = strchr(line, '+'); + if (plus) + data->lineno = strtol(plus, NULL, 10) - 1; + else + die("invalid diff"); + } +} + +static unsigned char *deflate_it(char *data, + unsigned long size, + unsigned long *result_size) +{ + int bound; + unsigned char *deflated; + z_stream stream; + + memset(&stream, 0, sizeof(stream)); + deflateInit(&stream, zlib_compression_level); + bound = deflateBound(&stream, size); + deflated = xmalloc(bound); + stream.next_out = deflated; + stream.avail_out = bound; + + stream.next_in = (unsigned char *)data; + stream.avail_in = size; + while (deflate(&stream, Z_FINISH) == Z_OK) + ; /* nothing */ + deflateEnd(&stream); + *result_size = stream.total_out; + return deflated; +} + +static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two) +{ + void *cp; + void *delta; + void *deflated; + void *data; + unsigned long orig_size; + unsigned long delta_size; + unsigned long deflate_size; + unsigned long data_size; + + /* We could do deflated delta, or we could do just deflated two, + * whichever is smaller. + */ + delta = NULL; + deflated = deflate_it(two->ptr, two->size, &deflate_size); + if (one->size && two->size) { + delta = diff_delta(one->ptr, one->size, + two->ptr, two->size, + &delta_size, deflate_size); + if (delta) { + void *to_free = delta; + orig_size = delta_size; + delta = deflate_it(delta, delta_size, &delta_size); + free(to_free); + } + } + + if (delta && delta_size < deflate_size) { + fprintf(file, "delta %lu\n", orig_size); + free(deflated); + data = delta; + data_size = delta_size; + } + else { + fprintf(file, "literal %lu\n", two->size); + free(delta); + data = deflated; + data_size = deflate_size; + } + + /* emit data encoded in base85 */ + cp = data; + while (data_size) { + int bytes = (52 < data_size) ? 52 : data_size; + char line[70]; + data_size -= bytes; + if (bytes <= 26) + line[0] = bytes + 'A' - 1; + else + line[0] = bytes - 26 + 'a' - 1; + encode_85(line + 1, cp, bytes); + cp = (char *) cp + bytes; + fputs(line, file); + fputc('\n', file); + } + fprintf(file, "\n"); + free(data); +} + +static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two) +{ + fprintf(file, "GIT binary patch\n"); + emit_binary_diff_body(file, one, two); + emit_binary_diff_body(file, two, one); +} + +static void diff_filespec_load_driver(struct diff_filespec *one) +{ + if (!one->driver) + one->driver = userdiff_find_by_path(one->path); + if (!one->driver) + one->driver = userdiff_find_by_name("default"); +} + +int diff_filespec_is_binary(struct diff_filespec *one) +{ + if (one->is_binary == -1) { + diff_filespec_load_driver(one); + if (one->driver->binary != -1) + one->is_binary = one->driver->binary; + else { + if (!one->data && DIFF_FILE_VALID(one)) + diff_populate_filespec(one, 0); + if (one->data) + one->is_binary = buffer_is_binary(one->data, + one->size); + if (one->is_binary == -1) + one->is_binary = 0; + } + } + return one->is_binary; +} + +static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one) +{ + diff_filespec_load_driver(one); + return one->driver->funcname.pattern ? &one->driver->funcname : NULL; +} + +static const char *userdiff_word_regex(struct diff_filespec *one) +{ + diff_filespec_load_driver(one); + return one->driver->word_regex; +} + +void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b) +{ + if (!options->a_prefix) + options->a_prefix = a; + if (!options->b_prefix) + options->b_prefix = b; +} + +static const char *get_textconv(struct diff_filespec *one) +{ + if (!DIFF_FILE_VALID(one)) + return NULL; + if (!S_ISREG(one->mode)) + return NULL; + diff_filespec_load_driver(one); + return one->driver->textconv; +} + +static void builtin_diff(const char *name_a, + const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + const char *lbl[2]; + char *a_one, *b_two; + const char *set = diff_get_color_opt(o, DIFF_METAINFO); + const char *reset = diff_get_color_opt(o, DIFF_RESET); + const char *a_prefix, *b_prefix; + const char *textconv_one = NULL, *textconv_two = NULL; + + if (DIFF_OPT_TST(o, SUBMODULE_LOG) && + (!one->mode || S_ISGITLINK(one->mode)) && + (!two->mode || S_ISGITLINK(two->mode))) { + const char *del = diff_get_color_opt(o, DIFF_FILE_OLD); + const char *add = diff_get_color_opt(o, DIFF_FILE_NEW); + show_submodule_summary(o->file, one ? one->path : two->path, + one->sha1, two->sha1, + del, add, reset); + return; + } + + if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) { + textconv_one = get_textconv(one); + textconv_two = get_textconv(two); + } + + diff_set_mnemonic_prefix(o, "a/", "b/"); + if (DIFF_OPT_TST(o, REVERSE_DIFF)) { + a_prefix = o->b_prefix; + b_prefix = o->a_prefix; + } else { + a_prefix = o->a_prefix; + b_prefix = o->b_prefix; + } + + /* Never use a non-valid filename anywhere if at all possible */ + name_a = DIFF_FILE_VALID(one) ? name_a : name_b; + name_b = DIFF_FILE_VALID(two) ? name_b : name_a; + + a_one = quote_two(a_prefix, name_a + (*name_a == '/')); + b_two = quote_two(b_prefix, name_b + (*name_b == '/')); + lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null"; + lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null"; + fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset); + if (lbl[0][0] == '/') { + /* /dev/null */ + fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset); + if (xfrm_msg && xfrm_msg[0]) + fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset); + } + else if (lbl[1][0] == '/') { + fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset); + if (xfrm_msg && xfrm_msg[0]) + fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset); + } + else { + if (one->mode != two->mode) { + fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset); + fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset); + } + if (xfrm_msg && xfrm_msg[0]) + fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset); + /* + * we do not run diff between different kind + * of objects. + */ + if ((one->mode ^ two->mode) & S_IFMT) + goto free_ab_and_return; + if (complete_rewrite && + (textconv_one || !diff_filespec_is_binary(one)) && + (textconv_two || !diff_filespec_is_binary(two))) { + emit_rewrite_diff(name_a, name_b, one, two, + textconv_one, textconv_two, o); + o->found_changes = 1; + goto free_ab_and_return; + } + } + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + if (!DIFF_OPT_TST(o, TEXT) && + ( (diff_filespec_is_binary(one) && !textconv_one) || + (diff_filespec_is_binary(two) && !textconv_two) )) { + /* Quite common confusing case */ + if (mf1.size == mf2.size && + !memcmp(mf1.ptr, mf2.ptr, mf1.size)) + goto free_ab_and_return; + if (DIFF_OPT_TST(o, BINARY)) + emit_binary_diff(o->file, &mf1, &mf2); + else + fprintf(o->file, "Binary files %s and %s differ\n", + lbl[0], lbl[1]); + o->found_changes = 1; + } + else { + /* Crazy xdl interfaces.. */ + const char *diffopts = getenv("GIT_DIFF_OPTS"); + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + struct emit_callback ecbdata; + const struct userdiff_funcname *pe; + + if (textconv_one) { + size_t size; + mf1.ptr = run_textconv(textconv_one, one, &size); + if (!mf1.ptr) + die("unable to read files to diff"); + mf1.size = size; + } + if (textconv_two) { + size_t size; + mf2.ptr = run_textconv(textconv_two, two, &size); + if (!mf2.ptr) + die("unable to read files to diff"); + mf2.size = size; + } + + pe = diff_funcname_pattern(one); + if (!pe) + pe = diff_funcname_pattern(two); + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + memset(&ecbdata, 0, sizeof(ecbdata)); + ecbdata.label_path = lbl; + ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF); + ecbdata.found_changesp = &o->found_changes; + ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a); + if (ecbdata.ws_rule & WS_BLANK_AT_EOF) + check_blank_at_eof(&mf1, &mf2, &ecbdata); + ecbdata.file = o->file; + xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + xecfg.ctxlen = o->context; + xecfg.interhunkctxlen = o->interhunkcontext; + xecfg.flags = XDL_EMIT_FUNCNAMES; + if (pe) + xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags); + if (!diffopts) + ; + else if (!prefixcmp(diffopts, "--unified=")) + xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10); + else if (!prefixcmp(diffopts, "-u")) + xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10); + if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) { + ecbdata.diff_words = + xcalloc(1, sizeof(struct diff_words_data)); + ecbdata.diff_words->file = o->file; + if (!o->word_regex) + o->word_regex = userdiff_word_regex(one); + if (!o->word_regex) + o->word_regex = userdiff_word_regex(two); + if (!o->word_regex) + o->word_regex = diff_word_regex_cfg; + if (o->word_regex) { + ecbdata.diff_words->word_regex = (regex_t *) + xmalloc(sizeof(regex_t)); + if (regcomp(ecbdata.diff_words->word_regex, + o->word_regex, + REG_EXTENDED | REG_NEWLINE)) + die ("Invalid regular expression: %s", + o->word_regex); + } + } + xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata, + &xpp, &xecfg, &ecb); + if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) + free_diff_words_data(&ecbdata); + if (textconv_one) + free(mf1.ptr); + if (textconv_two) + free(mf2.ptr); + xdiff_clear_find_func(&xecfg); + } + + free_ab_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + free(a_one); + free(b_two); + return; +} + +static void builtin_diffstat(const char *name_a, const char *name_b, + struct diff_filespec *one, + struct diff_filespec *two, + struct diffstat_t *diffstat, + struct diff_options *o, + int complete_rewrite) +{ + mmfile_t mf1, mf2; + struct diffstat_file *data; + + data = diffstat_add(diffstat, name_a, name_b); + + if (!one || !two) { + data->is_unmerged = 1; + return; + } + if (complete_rewrite) { + diff_populate_filespec(one, 0); + diff_populate_filespec(two, 0); + data->deleted = count_lines(one->data, one->size); + data->added = count_lines(two->data, two->size); + goto free_and_return; + } + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) { + data->is_binary = 1; + data->added = mf2.size; + data->deleted = mf1.size; + } else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat, + &xpp, &xecfg, &ecb); + } + + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); +} + +static void builtin_checkdiff(const char *name_a, const char *name_b, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o) +{ + mmfile_t mf1, mf2; + struct checkdiff_t data; + + if (!two) + return; + + memset(&data, 0, sizeof(data)); + data.filename = name_b ? name_b : name_a; + data.lineno = 0; + data.o = o; + data.ws_rule = whitespace_rule(attr_path); + + if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0) + die("unable to read files to diff"); + + /* + * All the other codepaths check both sides, but not checking + * the "old" side here is deliberate. We are checking the newly + * introduced changes, and as long as the "new" side is text, we + * can and should check what it introduces. + */ + if (diff_filespec_is_binary(two)) + goto free_and_return; + else { + /* Crazy xdl interfaces.. */ + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + xecfg.ctxlen = 1; /* at least one context line */ + xpp.flags = XDF_NEED_MINIMAL; + xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data, + &xpp, &xecfg, &ecb); + + if (data.ws_rule & WS_BLANK_AT_EOF) { + struct emit_callback ecbdata; + int blank_at_eof; + + ecbdata.ws_rule = data.ws_rule; + check_blank_at_eof(&mf1, &mf2, &ecbdata); + blank_at_eof = ecbdata.blank_at_eof_in_preimage; + + if (blank_at_eof) { + static char *err; + if (!err) + err = whitespace_error_string(WS_BLANK_AT_EOF); + fprintf(o->file, "%s:%d: %s.\n", + data.filename, blank_at_eof, err); + data.status = 1; /* report errors */ + } + } + } + free_and_return: + diff_free_filespec_data(one); + diff_free_filespec_data(two); + if (data.status) + DIFF_OPT_SET(o, CHECK_FAILED); +} + +struct diff_filespec *alloc_filespec(const char *path) +{ + int namelen = strlen(path); + struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1); + + memset(spec, 0, sizeof(*spec)); + spec->path = (char *)(spec + 1); + memcpy(spec->path, path, namelen+1); + spec->count = 1; + spec->is_binary = -1; + return spec; +} + +void free_filespec(struct diff_filespec *spec) +{ + if (!--spec->count) { + diff_free_filespec_data(spec); + free(spec); + } +} + +void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1, + unsigned short mode) +{ + if (mode) { + spec->mode = canon_mode(mode); + hashcpy(spec->sha1, sha1); + spec->sha1_valid = !is_null_sha1(sha1); + } +} + +/* + * Given a name and sha1 pair, if the index tells us the file in + * the work tree has that object contents, return true, so that + * prepare_temp_file() does not have to inflate and extract. + */ +static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file) +{ + struct cache_entry *ce; + struct stat st; + int pos, len; + + /* + * We do not read the cache ourselves here, because the + * benchmark with my previous version that always reads cache + * shows that it makes things worse for diff-tree comparing + * two linux-2.6 kernel trees in an already checked out work + * tree. This is because most diff-tree comparisons deal with + * only a small number of files, while reading the cache is + * expensive for a large project, and its cost outweighs the + * savings we get by not inflating the object to a temporary + * file. Practically, this code only helps when we are used + * by diff-cache --cached, which does read the cache before + * calling us. + */ + if (!active_cache) + return 0; + + /* We want to avoid the working directory if our caller + * doesn't need the data in a normal file, this system + * is rather slow with its stat/open/mmap/close syscalls, + * and the object is contained in a pack file. The pack + * is probably already open and will be faster to obtain + * the data through than the working directory. Loose + * objects however would tend to be slower as they need + * to be individually opened and inflated. + */ + if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1)) + return 0; + + len = strlen(name); + pos = cache_name_pos(name, len); + if (pos < 0) + return 0; + ce = active_cache[pos]; + + /* + * This is not the sha1 we are looking for, or + * unreusable because it is not a regular file. + */ + if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode)) + return 0; + + /* + * If ce is marked as "assume unchanged", there is no + * guarantee that work tree matches what we are looking for. + */ + if (ce->ce_flags & CE_VALID) + return 0; + + /* + * If ce matches the file in the work tree, we can reuse it. + */ + if (ce_uptodate(ce) || + (!lstat(name, &st) && !ce_match_stat(ce, &st, 0))) + return 1; + + return 0; +} + +static int populate_from_stdin(struct diff_filespec *s) +{ + struct strbuf buf = STRBUF_INIT; + size_t size = 0; + + if (strbuf_read(&buf, 0, 0) < 0) + return error("error while reading from stdin %s", + strerror(errno)); + + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + return 0; +} + +static int diff_populate_gitlink(struct diff_filespec *s, int size_only) +{ + int len; + char *data = xmalloc(100); + len = snprintf(data, 100, + "Subproject commit %s\n", sha1_to_hex(s->sha1)); + s->data = data; + s->size = len; + s->should_free = 1; + if (size_only) { + s->data = NULL; + free(data); + } + return 0; +} + +/* + * While doing rename detection and pickaxe operation, we may need to + * grab the data for the blob (or file) for our own in-core comparison. + * diff_filespec has data and size fields for this purpose. + */ +int diff_populate_filespec(struct diff_filespec *s, int size_only) +{ + int err = 0; + if (!DIFF_FILE_VALID(s)) + die("internal error: asking to populate invalid file."); + if (S_ISDIR(s->mode)) + return -1; + + if (s->data) + return 0; + + if (size_only && 0 < s->size) + return 0; + + if (S_ISGITLINK(s->mode)) + return diff_populate_gitlink(s, size_only); + + if (!s->sha1_valid || + reuse_worktree_file(s->path, s->sha1, 0)) { + struct strbuf buf = STRBUF_INIT; + struct stat st; + int fd; + + if (!strcmp(s->path, "-")) + return populate_from_stdin(s); + + if (lstat(s->path, &st) < 0) { + if (errno == ENOENT) { + err_empty: + err = -1; + empty: + s->data = (char *)""; + s->size = 0; + return err; + } + } + s->size = xsize_t(st.st_size); + if (!s->size) + goto empty; + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + + if (strbuf_readlink(&sb, s->path, s->size)) + goto err_empty; + s->size = sb.len; + s->data = strbuf_detach(&sb, NULL); + s->should_free = 1; + return 0; + } + if (size_only) + return 0; + fd = open(s->path, O_RDONLY); + if (fd < 0) + goto err_empty; + s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0); + close(fd); + s->should_munmap = 1; + + /* + * Convert from working tree format to canonical git format + */ + if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) { + size_t size = 0; + munmap(s->data, s->size); + s->should_munmap = 0; + s->data = strbuf_detach(&buf, &size); + s->size = size; + s->should_free = 1; + } + } + else { + enum object_type type; + if (size_only) + type = sha1_object_info(s->sha1, &s->size); + else { + s->data = read_sha1_file(s->sha1, &type, &s->size); + s->should_free = 1; + } + } + return 0; +} + +void diff_free_filespec_blob(struct diff_filespec *s) +{ + if (s->should_free) + free(s->data); + else if (s->should_munmap) + munmap(s->data, s->size); + + if (s->should_free || s->should_munmap) { + s->should_free = s->should_munmap = 0; + s->data = NULL; + } +} + +void diff_free_filespec_data(struct diff_filespec *s) +{ + diff_free_filespec_blob(s); + free(s->cnt_data); + s->cnt_data = NULL; +} + +static void prep_temp_blob(const char *path, struct diff_tempfile *temp, + void *blob, + unsigned long size, + const unsigned char *sha1, + int mode) +{ + int fd; + struct strbuf buf = STRBUF_INIT; + struct strbuf template = STRBUF_INIT; + char *path_dup = xstrdup(path); + const char *base = basename(path_dup); + + /* Generate "XXXXXX_basename.ext" */ + strbuf_addstr(&template, "XXXXXX_"); + strbuf_addstr(&template, base); + + fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf, + strlen(base) + 1); + if (fd < 0) + die_errno("unable to create temp-file"); + if (convert_to_working_tree(path, + (const char *)blob, (size_t)size, &buf)) { + blob = buf.buf; + size = buf.len; + } + if (write_in_full(fd, blob, size) != size) + die_errno("unable to write temp-file"); + close(fd); + temp->name = temp->tmp_path; + strcpy(temp->hex, sha1_to_hex(sha1)); + temp->hex[40] = 0; + sprintf(temp->mode, "%06o", mode); + strbuf_release(&buf); + strbuf_release(&template); + free(path_dup); +} + +static struct diff_tempfile *prepare_temp_file(const char *name, + struct diff_filespec *one) +{ + struct diff_tempfile *temp = claim_diff_tempfile(); + + if (!DIFF_FILE_VALID(one)) { + not_a_valid_file: + /* A '-' entry produces this for file-2, and + * a '+' entry produces this for file-1. + */ + temp->name = "/dev/null"; + strcpy(temp->hex, "."); + strcpy(temp->mode, "."); + return temp; + } + + if (!remove_tempfile_installed) { + atexit(remove_tempfile); + sigchain_push_common(remove_tempfile_on_signal); + remove_tempfile_installed = 1; + } + + if (!one->sha1_valid || + reuse_worktree_file(name, one->sha1, 1)) { + struct stat st; + if (lstat(name, &st) < 0) { + if (errno == ENOENT) + goto not_a_valid_file; + die_errno("stat(%s)", name); + } + if (S_ISLNK(st.st_mode)) { + struct strbuf sb = STRBUF_INIT; + if (strbuf_readlink(&sb, name, st.st_size) < 0) + die_errno("readlink(%s)", name); + prep_temp_blob(name, temp, sb.buf, sb.len, + (one->sha1_valid ? + one->sha1 : null_sha1), + (one->sha1_valid ? + one->mode : S_IFLNK)); + strbuf_release(&sb); + } + else { + /* we can borrow from the file in the work tree */ + temp->name = name; + if (!one->sha1_valid) + strcpy(temp->hex, sha1_to_hex(null_sha1)); + else + strcpy(temp->hex, sha1_to_hex(one->sha1)); + /* Even though we may sometimes borrow the + * contents from the work tree, we always want + * one->mode. mode is trustworthy even when + * !(one->sha1_valid), as long as + * DIFF_FILE_VALID(one). + */ + sprintf(temp->mode, "%06o", one->mode); + } + return temp; + } + else { + if (diff_populate_filespec(one, 0)) + die("cannot read data blob for %s", one->path); + prep_temp_blob(name, temp, one->data, one->size, + one->sha1, one->mode); + } + return temp; +} + +/* An external diff command takes: + * + * diff-cmd name infile1 infile1-sha1 infile1-mode \ + * infile2 infile2-sha1 infile2-mode [ rename-to ] + * + */ +static void run_external_diff(const char *pgm, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + const char *xfrm_msg, + int complete_rewrite) +{ + const char *spawn_arg[10]; + int retval; + const char **arg = &spawn_arg[0]; + + if (one && two) { + struct diff_tempfile *temp_one, *temp_two; + const char *othername = (other ? other : name); + temp_one = prepare_temp_file(name, one); + temp_two = prepare_temp_file(othername, two); + *arg++ = pgm; + *arg++ = name; + *arg++ = temp_one->name; + *arg++ = temp_one->hex; + *arg++ = temp_one->mode; + *arg++ = temp_two->name; + *arg++ = temp_two->hex; + *arg++ = temp_two->mode; + if (other) { + *arg++ = other; + *arg++ = xfrm_msg; + } + } else { + *arg++ = pgm; + *arg++ = name; + } + *arg = NULL; + fflush(NULL); + retval = run_command_v_opt(spawn_arg, 0); + remove_tempfile(); + if (retval) { + fprintf(stderr, "external diff died, stopping at %s.\n", name); + exit(1); + } +} + +static int similarity_index(struct diff_filepair *p) +{ + return p->score * 100 / MAX_SCORE; +} + +static void fill_metainfo(struct strbuf *msg, + const char *name, + const char *other, + struct diff_filespec *one, + struct diff_filespec *two, + struct diff_options *o, + struct diff_filepair *p) +{ + strbuf_init(msg, PATH_MAX * 2 + 300); + switch (p->status) { + case DIFF_STATUS_COPIED: + strbuf_addf(msg, "similarity index %d%%", similarity_index(p)); + strbuf_addstr(msg, "\ncopy from "); + quote_c_style(name, msg, NULL, 0); + strbuf_addstr(msg, "\ncopy to "); + quote_c_style(other, msg, NULL, 0); + strbuf_addch(msg, '\n'); + break; + case DIFF_STATUS_RENAMED: + strbuf_addf(msg, "similarity index %d%%", similarity_index(p)); + strbuf_addstr(msg, "\nrename from "); + quote_c_style(name, msg, NULL, 0); + strbuf_addstr(msg, "\nrename to "); + quote_c_style(other, msg, NULL, 0); + strbuf_addch(msg, '\n'); + break; + case DIFF_STATUS_MODIFIED: + if (p->score) { + strbuf_addf(msg, "dissimilarity index %d%%\n", + similarity_index(p)); + break; + } + /* fallthru */ + default: + /* nothing */ + ; + } + if (one && two && hashcmp(one->sha1, two->sha1)) { + int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV; + + if (DIFF_OPT_TST(o, BINARY)) { + mmfile_t mf; + if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) || + (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two))) + abbrev = 40; + } + strbuf_addf(msg, "index %.*s..%.*s", + abbrev, sha1_to_hex(one->sha1), + abbrev, sha1_to_hex(two->sha1)); + if (one->mode == two->mode) + strbuf_addf(msg, " %06o", one->mode); + strbuf_addch(msg, '\n'); + } + if (msg->len) + strbuf_setlen(msg, msg->len - 1); +} + +static void run_diff_cmd(const char *pgm, + const char *name, + const char *other, + const char *attr_path, + struct diff_filespec *one, + struct diff_filespec *two, + struct strbuf *msg, + struct diff_options *o, + struct diff_filepair *p) +{ + const char *xfrm_msg = NULL; + int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score; + + if (msg) { + fill_metainfo(msg, name, other, one, two, o, p); + xfrm_msg = msg->len ? msg->buf : NULL; + } + + if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL)) + pgm = NULL; + else { + struct userdiff_driver *drv = userdiff_find_by_path(attr_path); + if (drv && drv->external) + pgm = drv->external; + } + + if (pgm) { + run_external_diff(pgm, name, other, one, two, xfrm_msg, + complete_rewrite); + return; + } + if (one && two) + builtin_diff(name, other ? other : name, + one, two, xfrm_msg, o, complete_rewrite); + else + fprintf(o->file, "* Unmerged path %s\n", name); +} + +static void diff_fill_sha1_info(struct diff_filespec *one) +{ + if (DIFF_FILE_VALID(one)) { + if (!one->sha1_valid) { + struct stat st; + if (!strcmp(one->path, "-")) { + hashcpy(one->sha1, null_sha1); + return; + } + if (lstat(one->path, &st) < 0) + die_errno("stat '%s'", one->path); + if (index_path(one->sha1, one->path, &st, 0)) + die("cannot hash %s", one->path); + } + } + else + hashclr(one->sha1); +} + +static void strip_prefix(int prefix_length, const char **namep, const char **otherp) +{ + /* Strip the prefix but do not molest /dev/null and absolute paths */ + if (*namep && **namep != '/') + *namep += prefix_length; + if (*otherp && **otherp != '/') + *otherp += prefix_length; +} + +static void run_diff(struct diff_filepair *p, struct diff_options *o) +{ + const char *pgm = external_diff(); + struct strbuf msg; + struct diff_filespec *one = p->one; + struct diff_filespec *two = p->two; + const char *name; + const char *other; + const char *attr_path; + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + attr_path = name; + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + if (DIFF_PAIR_UNMERGED(p)) { + run_diff_cmd(pgm, name, NULL, attr_path, + NULL, NULL, NULL, o, p); + return; + } + + diff_fill_sha1_info(one); + diff_fill_sha1_info(two); + + if (!pgm && + DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) && + (S_IFMT & one->mode) != (S_IFMT & two->mode)) { + /* + * a filepair that changes between file and symlink + * needs to be split into deletion and creation. + */ + struct diff_filespec *null = alloc_filespec(two->path); + run_diff_cmd(NULL, name, other, attr_path, + one, null, &msg, o, p); + free(null); + strbuf_release(&msg); + + null = alloc_filespec(one->path); + run_diff_cmd(NULL, name, other, attr_path, + null, two, &msg, o, p); + free(null); + } + else + run_diff_cmd(pgm, name, other, attr_path, + one, two, &msg, o, p); + + strbuf_release(&msg); +} + +static void run_diffstat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + const char *name; + const char *other; + int complete_rewrite = 0; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0); + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + + if (p->status == DIFF_STATUS_MODIFIED && p->score) + complete_rewrite = 1; + builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite); +} + +static void run_checkdiff(struct diff_filepair *p, struct diff_options *o) +{ + const char *name; + const char *other; + const char *attr_path; + + if (DIFF_PAIR_UNMERGED(p)) { + /* unmerged */ + return; + } + + name = p->one->path; + other = (strcmp(name, p->two->path) ? p->two->path : NULL); + attr_path = other ? other : name; + + if (o->prefix_length) + strip_prefix(o->prefix_length, &name, &other); + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + + builtin_checkdiff(name, other, attr_path, p->one, p->two, o); +} + +void diff_setup(struct diff_options *options) +{ + memset(options, 0, sizeof(*options)); + + options->file = stdout; + + options->line_termination = '\n'; + options->break_opt = -1; + options->rename_limit = -1; + options->dirstat_percent = 3; + options->context = 3; + + options->change = diff_change; + options->add_remove = diff_addremove; + if (diff_use_color_default > 0) + DIFF_OPT_SET(options, COLOR_DIFF); + options->detect_rename = diff_detect_rename_default; + + if (!diff_mnemonic_prefix) { + options->a_prefix = "a/"; + options->b_prefix = "b/"; + } +} + +int diff_setup_done(struct diff_options *options) +{ + int count = 0; + + if (options->output_format & DIFF_FORMAT_NAME) + count++; + if (options->output_format & DIFF_FORMAT_NAME_STATUS) + count++; + if (options->output_format & DIFF_FORMAT_CHECKDIFF) + count++; + if (options->output_format & DIFF_FORMAT_NO_OUTPUT) + count++; + if (count > 1) + die("--name-only, --name-status, --check and -s are mutually exclusive"); + + if (DIFF_OPT_TST(options, FIND_COPIES_HARDER)) + options->detect_rename = DIFF_DETECT_COPY; + + if (!DIFF_OPT_TST(options, RELATIVE_NAME)) + options->prefix = NULL; + if (options->prefix) + options->prefix_length = strlen(options->prefix); + else + options->prefix_length = 0; + + if (options->output_format & (DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF | + DIFF_FORMAT_NO_OUTPUT)) + options->output_format &= ~(DIFF_FORMAT_RAW | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_PATCH); + + /* + * These cases always need recursive; we do not drop caller-supplied + * recursive bits for other formats here. + */ + if (options->output_format & (DIFF_FORMAT_PATCH | + DIFF_FORMAT_NUMSTAT | + DIFF_FORMAT_DIFFSTAT | + DIFF_FORMAT_SHORTSTAT | + DIFF_FORMAT_DIRSTAT | + DIFF_FORMAT_SUMMARY | + DIFF_FORMAT_CHECKDIFF)) + DIFF_OPT_SET(options, RECURSIVE); + /* + * Also pickaxe would not work very well if you do not say recursive + */ + if (options->pickaxe) + DIFF_OPT_SET(options, RECURSIVE); + + if (options->detect_rename && options->rename_limit < 0) + options->rename_limit = diff_rename_limit_default; + if (options->setup & DIFF_SETUP_USE_CACHE) { + if (!active_cache) + /* read-cache does not die even when it fails + * so it is safe for us to do this here. Also + * it does not smudge active_cache or active_nr + * when it fails, so we do not have to worry about + * cleaning it up ourselves either. + */ + read_cache(); + } + if (options->abbrev <= 0 || 40 < options->abbrev) + options->abbrev = 40; /* full */ + + /* + * It does not make sense to show the first hit we happened + * to have found. It does not make sense not to return with + * exit code in such a case either. + */ + if (DIFF_OPT_TST(options, QUIET)) { + options->output_format = DIFF_FORMAT_NO_OUTPUT; + DIFF_OPT_SET(options, EXIT_WITH_STATUS); + } + + return 0; +} + +static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val) +{ + char c, *eq; + int len; + + if (*arg != '-') + return 0; + c = *++arg; + if (!c) + return 0; + if (c == arg_short) { + c = *++arg; + if (!c) + return 1; + if (val && isdigit(c)) { + char *end; + int n = strtoul(arg, &end, 10); + if (*end) + return 0; + *val = n; + return 1; + } + return 0; + } + if (c != '-') + return 0; + arg++; + eq = strchr(arg, '='); + if (eq) + len = eq - arg; + else + len = strlen(arg); + if (!len || strncmp(arg, arg_long, len)) + return 0; + if (eq) { + int n; + char *end; + if (!isdigit(*++eq)) + return 0; + n = strtoul(eq, &end, 10); + if (*end) + return 0; + *val = n; + } + return 1; +} + +static int diff_scoreopt_parse(const char *opt); + +int diff_opt_parse(struct diff_options *options, const char **av, int ac) +{ + const char *arg = av[0]; + + /* Output format options */ + if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) + options->output_format |= DIFF_FORMAT_PATCH; + else if (opt_arg(arg, 'U', "unified", &options->context)) + options->output_format |= DIFF_FORMAT_PATCH; + else if (!strcmp(arg, "--raw")) + options->output_format |= DIFF_FORMAT_RAW; + else if (!strcmp(arg, "--patch-with-raw")) + options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW; + else if (!strcmp(arg, "--numstat")) + options->output_format |= DIFF_FORMAT_NUMSTAT; + else if (!strcmp(arg, "--shortstat")) + options->output_format |= DIFF_FORMAT_SHORTSTAT; + else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent)) + options->output_format |= DIFF_FORMAT_DIRSTAT; + else if (!strcmp(arg, "--cumulative")) { + options->output_format |= DIFF_FORMAT_DIRSTAT; + DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE); + } else if (opt_arg(arg, 0, "dirstat-by-file", + &options->dirstat_percent)) { + options->output_format |= DIFF_FORMAT_DIRSTAT; + DIFF_OPT_SET(options, DIRSTAT_BY_FILE); + } + else if (!strcmp(arg, "--check")) + options->output_format |= DIFF_FORMAT_CHECKDIFF; + else if (!strcmp(arg, "--summary")) + options->output_format |= DIFF_FORMAT_SUMMARY; + else if (!strcmp(arg, "--patch-with-stat")) + options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT; + else if (!strcmp(arg, "--name-only")) + options->output_format |= DIFF_FORMAT_NAME; + else if (!strcmp(arg, "--name-status")) + options->output_format |= DIFF_FORMAT_NAME_STATUS; + else if (!strcmp(arg, "-s")) + options->output_format |= DIFF_FORMAT_NO_OUTPUT; + else if (!prefixcmp(arg, "--stat")) { + char *end; + int width = options->stat_width; + int name_width = options->stat_name_width; + arg += 6; + end = (char *)arg; + + switch (*arg) { + case '-': + if (!prefixcmp(arg, "-width=")) + width = strtoul(arg + 7, &end, 10); + else if (!prefixcmp(arg, "-name-width=")) + name_width = strtoul(arg + 12, &end, 10); + break; + case '=': + width = strtoul(arg+1, &end, 10); + if (*end == ',') + name_width = strtoul(end+1, &end, 10); + } + + /* Important! This checks all the error cases! */ + if (*end) + return 0; + options->output_format |= DIFF_FORMAT_DIFFSTAT; + options->stat_name_width = name_width; + options->stat_width = width; + } + + /* renames options */ + else if (!prefixcmp(arg, "-B")) { + if ((options->break_opt = diff_scoreopt_parse(arg)) == -1) + return -1; + } + else if (!prefixcmp(arg, "-M")) { + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return -1; + options->detect_rename = DIFF_DETECT_RENAME; + } + else if (!prefixcmp(arg, "-C")) { + if (options->detect_rename == DIFF_DETECT_COPY) + DIFF_OPT_SET(options, FIND_COPIES_HARDER); + if ((options->rename_score = diff_scoreopt_parse(arg)) == -1) + return -1; + options->detect_rename = DIFF_DETECT_COPY; + } + else if (!strcmp(arg, "--no-renames")) + options->detect_rename = 0; + else if (!strcmp(arg, "--relative")) + DIFF_OPT_SET(options, RELATIVE_NAME); + else if (!prefixcmp(arg, "--relative=")) { + DIFF_OPT_SET(options, RELATIVE_NAME); + options->prefix = arg + 11; + } + + /* xdiff options */ + else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE); + else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE); + else if (!strcmp(arg, "--ignore-space-at-eol")) + DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL); + else if (!strcmp(arg, "--patience")) + DIFF_XDL_SET(options, PATIENCE_DIFF); + + /* flags options */ + else if (!strcmp(arg, "--binary")) { + options->output_format |= DIFF_FORMAT_PATCH; + DIFF_OPT_SET(options, BINARY); + } + else if (!strcmp(arg, "--full-index")) + DIFF_OPT_SET(options, FULL_INDEX); + else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) + DIFF_OPT_SET(options, TEXT); + else if (!strcmp(arg, "-R")) + DIFF_OPT_SET(options, REVERSE_DIFF); + else if (!strcmp(arg, "--find-copies-harder")) + DIFF_OPT_SET(options, FIND_COPIES_HARDER); + else if (!strcmp(arg, "--follow")) + DIFF_OPT_SET(options, FOLLOW_RENAMES); + else if (!strcmp(arg, "--color")) + DIFF_OPT_SET(options, COLOR_DIFF); + else if (!strcmp(arg, "--no-color")) + DIFF_OPT_CLR(options, COLOR_DIFF); + else if (!strcmp(arg, "--color-words")) { + DIFF_OPT_SET(options, COLOR_DIFF); + DIFF_OPT_SET(options, COLOR_DIFF_WORDS); + } + else if (!prefixcmp(arg, "--color-words=")) { + DIFF_OPT_SET(options, COLOR_DIFF); + DIFF_OPT_SET(options, COLOR_DIFF_WORDS); + options->word_regex = arg + 14; + } + else if (!strcmp(arg, "--exit-code")) + DIFF_OPT_SET(options, EXIT_WITH_STATUS); + else if (!strcmp(arg, "--quiet")) + DIFF_OPT_SET(options, QUIET); + else if (!strcmp(arg, "--ext-diff")) + DIFF_OPT_SET(options, ALLOW_EXTERNAL); + else if (!strcmp(arg, "--no-ext-diff")) + DIFF_OPT_CLR(options, ALLOW_EXTERNAL); + else if (!strcmp(arg, "--textconv")) + DIFF_OPT_SET(options, ALLOW_TEXTCONV); + else if (!strcmp(arg, "--no-textconv")) + DIFF_OPT_CLR(options, ALLOW_TEXTCONV); + else if (!strcmp(arg, "--ignore-submodules")) + DIFF_OPT_SET(options, IGNORE_SUBMODULES); + else if (!strcmp(arg, "--submodule")) + DIFF_OPT_SET(options, SUBMODULE_LOG); + else if (!prefixcmp(arg, "--submodule=")) { + if (!strcmp(arg + 12, "log")) + DIFF_OPT_SET(options, SUBMODULE_LOG); + } + + /* misc options */ + else if (!strcmp(arg, "-z")) + options->line_termination = 0; + else if (!prefixcmp(arg, "-l")) + options->rename_limit = strtoul(arg+2, NULL, 10); + else if (!prefixcmp(arg, "-S")) + options->pickaxe = arg + 2; + else if (!strcmp(arg, "--pickaxe-all")) + options->pickaxe_opts = DIFF_PICKAXE_ALL; + else if (!strcmp(arg, "--pickaxe-regex")) + options->pickaxe_opts = DIFF_PICKAXE_REGEX; + else if (!prefixcmp(arg, "-O")) + options->orderfile = arg + 2; + else if (!prefixcmp(arg, "--diff-filter=")) + options->filter = arg + 14; + else if (!strcmp(arg, "--abbrev")) + options->abbrev = DEFAULT_ABBREV; + else if (!prefixcmp(arg, "--abbrev=")) { + options->abbrev = strtoul(arg + 9, NULL, 10); + if (options->abbrev < MINIMUM_ABBREV) + options->abbrev = MINIMUM_ABBREV; + else if (40 < options->abbrev) + options->abbrev = 40; + } + else if (!prefixcmp(arg, "--src-prefix=")) + options->a_prefix = arg + 13; + else if (!prefixcmp(arg, "--dst-prefix=")) + options->b_prefix = arg + 13; + else if (!strcmp(arg, "--no-prefix")) + options->a_prefix = options->b_prefix = ""; + else if (opt_arg(arg, '\0', "inter-hunk-context", + &options->interhunkcontext)) + ; + else if (!prefixcmp(arg, "--output=")) { + options->file = fopen(arg + strlen("--output="), "w"); + options->close_file = 1; + } else + return 0; + return 1; +} + +static int parse_num(const char **cp_p) +{ + unsigned long num, scale; + int ch, dot; + const char *cp = *cp_p; + + num = 0; + scale = 1; + dot = 0; + for (;;) { + ch = *cp; + if ( !dot && ch == '.' ) { + scale = 1; + dot = 1; + } else if ( ch == '%' ) { + scale = dot ? scale*100 : 100; + cp++; /* % is always at the end */ + break; + } else if ( ch >= '0' && ch <= '9' ) { + if ( scale < 100000 ) { + scale *= 10; + num = (num*10) + (ch-'0'); + } + } else { + break; + } + cp++; + } + *cp_p = cp; + + /* user says num divided by scale and we say internally that + * is MAX_SCORE * num / scale. + */ + return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale)); +} + +static int diff_scoreopt_parse(const char *opt) +{ + int opt1, opt2, cmd; + + if (*opt++ != '-') + return -1; + cmd = *opt++; + if (cmd != 'M' && cmd != 'C' && cmd != 'B') + return -1; /* that is not a -M, -C nor -B option */ + + opt1 = parse_num(&opt); + if (cmd != 'B') + opt2 = 0; + else { + if (*opt == 0) + opt2 = 0; + else if (*opt != '/') + return -1; /* we expect -B80/99 or -B80 */ + else { + opt++; + opt2 = parse_num(&opt); + } + } + if (*opt != 0) + return -1; + return opt1 | (opt2 << 16); +} + +struct diff_queue_struct diff_queued_diff; + +void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp) +{ + if (queue->alloc <= queue->nr) { + queue->alloc = alloc_nr(queue->alloc); + queue->queue = xrealloc(queue->queue, + sizeof(dp) * queue->alloc); + } + queue->queue[queue->nr++] = dp; +} + +struct diff_filepair *diff_queue(struct diff_queue_struct *queue, + struct diff_filespec *one, + struct diff_filespec *two) +{ + struct diff_filepair *dp = xcalloc(1, sizeof(*dp)); + dp->one = one; + dp->two = two; + if (queue) + diff_q(queue, dp); + return dp; +} + +void diff_free_filepair(struct diff_filepair *p) +{ + free_filespec(p->one); + free_filespec(p->two); + free(p); +} + +/* This is different from find_unique_abbrev() in that + * it stuffs the result with dots for alignment. + */ +const char *diff_unique_abbrev(const unsigned char *sha1, int len) +{ + int abblen; + const char *abbrev; + if (len == 40) + return sha1_to_hex(sha1); + + abbrev = find_unique_abbrev(sha1, len); + abblen = strlen(abbrev); + if (abblen < 37) { + static char hex[41]; + if (len < abblen && abblen <= len + 2) + sprintf(hex, "%s%.*s", abbrev, len+3-abblen, ".."); + else + sprintf(hex, "%s...", abbrev); + return hex; + } + return sha1_to_hex(sha1); +} + +static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt) +{ + int line_termination = opt->line_termination; + int inter_name_termination = line_termination ? '\t' : '\0'; + + if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) { + fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode, + diff_unique_abbrev(p->one->sha1, opt->abbrev)); + fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev)); + } + if (p->score) { + fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p), + inter_name_termination); + } else { + fprintf(opt->file, "%c%c", p->status, inter_name_termination); + } + + if (p->status == DIFF_STATUS_COPIED || + p->status == DIFF_STATUS_RENAMED) { + const char *name_a, *name_b; + name_a = p->one->path; + name_b = p->two->path; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, inter_name_termination); + write_name_quoted(name_b, opt->file, line_termination); + } else { + const char *name_a, *name_b; + name_a = p->one->mode ? p->one->path : p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, line_termination); + } +} + +int diff_unmodified_pair(struct diff_filepair *p) +{ + /* This function is written stricter than necessary to support + * the currently implemented transformers, but the idea is to + * let transformers to produce diff_filepairs any way they want, + * and filter and clean them up here before producing the output. + */ + struct diff_filespec *one = p->one, *two = p->two; + + if (DIFF_PAIR_UNMERGED(p)) + return 0; /* unmerged is interesting */ + + /* deletion, addition, mode or type change + * and rename are all interesting. + */ + if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) || + DIFF_PAIR_MODE_CHANGED(p) || + strcmp(one->path, two->path)) + return 0; + + /* both are valid and point at the same path. that is, we are + * dealing with a change. + */ + if (one->sha1_valid && two->sha1_valid && + !hashcmp(one->sha1, two->sha1)) + return 1; /* no change */ + if (!one->sha1_valid && !two->sha1_valid) + return 1; /* both look at the same file on the filesystem. */ + return 0; +} + +static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_diff(p, o); +} + +static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o, + struct diffstat_t *diffstat) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_diffstat(p, o, diffstat); +} + +static void diff_flush_checkdiff(struct diff_filepair *p, + struct diff_options *o) +{ + if (diff_unmodified_pair(p)) + return; + + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + return; /* no tree diffs in patch format */ + + run_checkdiff(p, o); +} + +int diff_queue_is_empty(void) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + for (i = 0; i < q->nr; i++) + if (!diff_unmodified_pair(q->queue[i])) + return 0; + return 1; +} + +#if DIFF_DEBUG +void diff_debug_filespec(struct diff_filespec *s, int x, const char *one) +{ + fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n", + x, one ? one : "", + s->path, + DIFF_FILE_VALID(s) ? "valid" : "invalid", + s->mode, + s->sha1_valid ? sha1_to_hex(s->sha1) : ""); + fprintf(stderr, "queue[%d] %s size %lu flags %d\n", + x, one ? one : "", + s->size, s->xfrm_flags); +} + +void diff_debug_filepair(const struct diff_filepair *p, int i) +{ + diff_debug_filespec(p->one, i, "one"); + diff_debug_filespec(p->two, i, "two"); + fprintf(stderr, "score %d, status %c rename_used %d broken %d\n", + p->score, p->status ? p->status : '?', + p->one->rename_used, p->broken_pair); +} + +void diff_debug_queue(const char *msg, struct diff_queue_struct *q) +{ + int i; + if (msg) + fprintf(stderr, "%s\n", msg); + fprintf(stderr, "q->nr = %d\n", q->nr); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + diff_debug_filepair(p, i); + } +} +#endif + +static void diff_resolve_rename_copy(void) +{ + int i; + struct diff_filepair *p; + struct diff_queue_struct *q = &diff_queued_diff; + + diff_debug_queue("resolve-rename-copy", q); + + for (i = 0; i < q->nr; i++) { + p = q->queue[i]; + p->status = 0; /* undecided */ + if (DIFF_PAIR_UNMERGED(p)) + p->status = DIFF_STATUS_UNMERGED; + else if (!DIFF_FILE_VALID(p->one)) + p->status = DIFF_STATUS_ADDED; + else if (!DIFF_FILE_VALID(p->two)) + p->status = DIFF_STATUS_DELETED; + else if (DIFF_PAIR_TYPE_CHANGED(p)) + p->status = DIFF_STATUS_TYPE_CHANGED; + + /* from this point on, we are dealing with a pair + * whose both sides are valid and of the same type, i.e. + * either in-place edit or rename/copy edit. + */ + else if (DIFF_PAIR_RENAME(p)) { + /* + * A rename might have re-connected a broken + * pair up, causing the pathnames to be the + * same again. If so, that's not a rename at + * all, just a modification.. + * + * Otherwise, see if this source was used for + * multiple renames, in which case we decrement + * the count, and call it a copy. + */ + if (!strcmp(p->one->path, p->two->path)) + p->status = DIFF_STATUS_MODIFIED; + else if (--p->one->rename_used > 0) + p->status = DIFF_STATUS_COPIED; + else + p->status = DIFF_STATUS_RENAMED; + } + else if (hashcmp(p->one->sha1, p->two->sha1) || + p->one->mode != p->two->mode || + is_null_sha1(p->one->sha1)) + p->status = DIFF_STATUS_MODIFIED; + else { + /* This is a "no-change" entry and should not + * happen anymore, but prepare for broken callers. + */ + error("feeding unmodified %s to diffcore", + p->one->path); + p->status = DIFF_STATUS_UNKNOWN; + } + } + diff_debug_queue("resolve-rename-copy done", q); +} + +static int check_pair_status(struct diff_filepair *p) +{ + switch (p->status) { + case DIFF_STATUS_UNKNOWN: + return 0; + case 0: + die("internal error in diff-resolve-rename-copy"); + default: + return 1; + } +} + +static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt) +{ + int fmt = opt->output_format; + + if (fmt & DIFF_FORMAT_CHECKDIFF) + diff_flush_checkdiff(p, opt); + else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) + diff_flush_raw(p, opt); + else if (fmt & DIFF_FORMAT_NAME) { + const char *name_a, *name_b; + name_a = p->two->path; + name_b = NULL; + strip_prefix(opt->prefix_length, &name_a, &name_b); + write_name_quoted(name_a, opt->file, opt->line_termination); + } +} + +static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs) +{ + if (fs->mode) + fprintf(file, " %s mode %06o ", newdelete, fs->mode); + else + fprintf(file, " %s ", newdelete); + write_name_quoted(fs->path, file, '\n'); +} + + +static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name) +{ + if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) { + fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode, + show_name ? ' ' : '\n'); + if (show_name) { + write_name_quoted(p->two->path, file, '\n'); + } + } +} + +static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p) +{ + char *names = pprint_rename(p->one->path, p->two->path); + + fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p)); + free(names); + show_mode_change(file, p, 0); +} + +static void diff_summary(FILE *file, struct diff_filepair *p) +{ + switch(p->status) { + case DIFF_STATUS_DELETED: + show_file_mode_name(file, "delete", p->one); + break; + case DIFF_STATUS_ADDED: + show_file_mode_name(file, "create", p->two); + break; + case DIFF_STATUS_COPIED: + show_rename_copy(file, "copy", p); + break; + case DIFF_STATUS_RENAMED: + show_rename_copy(file, "rename", p); + break; + default: + if (p->score) { + fputs(" rewrite ", file); + write_name_quoted(p->two->path, file, ' '); + fprintf(file, "(%d%%)\n", similarity_index(p)); + } + show_mode_change(file, p, !p->score); + break; + } +} + +struct patch_id_t { + git_SHA_CTX *ctx; + int patchlen; +}; + +static int remove_space(char *line, int len) +{ + int i; + char *dst = line; + unsigned char c; + + for (i = 0; i < len; i++) + if (!isspace((c = line[i]))) + *dst++ = c; + + return dst - line; +} + +static void patch_id_consume(void *priv, char *line, unsigned long len) +{ + struct patch_id_t *data = priv; + int new_len; + + /* Ignore line numbers when computing the SHA1 of the patch */ + if (!prefixcmp(line, "@@ -")) + return; + + new_len = remove_space(line, len); + + git_SHA1_Update(data->ctx, line, new_len); + data->patchlen += new_len; +} + +/* returns 0 upon success, and writes result into sha1 */ +static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + git_SHA_CTX ctx; + struct patch_id_t data; + char buffer[PATH_MAX * 4 + 20]; + + git_SHA1_Init(&ctx); + memset(&data, 0, sizeof(struct patch_id_t)); + data.ctx = &ctx; + + for (i = 0; i < q->nr; i++) { + xpparam_t xpp; + xdemitconf_t xecfg; + xdemitcb_t ecb; + mmfile_t mf1, mf2; + struct diff_filepair *p = q->queue[i]; + int len1, len2; + + memset(&xpp, 0, sizeof(xpp)); + memset(&xecfg, 0, sizeof(xecfg)); + if (p->status == 0) + return error("internal diff status error"); + if (p->status == DIFF_STATUS_UNKNOWN) + continue; + if (diff_unmodified_pair(p)) + continue; + if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) || + (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode))) + continue; + if (DIFF_PAIR_UNMERGED(p)) + continue; + + diff_fill_sha1_info(p->one); + diff_fill_sha1_info(p->two); + if (fill_mmfile(&mf1, p->one) < 0 || + fill_mmfile(&mf2, p->two) < 0) + return error("unable to read files to diff"); + + len1 = remove_space(p->one->path, strlen(p->one->path)); + len2 = remove_space(p->two->path, strlen(p->two->path)); + if (p->one->mode == 0) + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "newfilemode%06o" + "---/dev/null" + "+++b/%.*s", + len1, p->one->path, + len2, p->two->path, + p->two->mode, + len2, p->two->path); + else if (p->two->mode == 0) + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "deletedfilemode%06o" + "---a/%.*s" + "+++/dev/null", + len1, p->one->path, + len2, p->two->path, + p->one->mode, + len1, p->one->path); + else + len1 = snprintf(buffer, sizeof(buffer), + "diff--gita/%.*sb/%.*s" + "---a/%.*s" + "+++b/%.*s", + len1, p->one->path, + len2, p->two->path, + len1, p->one->path, + len2, p->two->path); + git_SHA1_Update(&ctx, buffer, len1); + + xpp.flags = XDF_NEED_MINIMAL; + xecfg.ctxlen = 3; + xecfg.flags = XDL_EMIT_FUNCNAMES; + xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data, + &xpp, &xecfg, &ecb); + } + + git_SHA1_Final(sha1, &ctx); + return 0; +} + +int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i; + int result = diff_get_patch_id(options, sha1); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + + free(q->queue); + q->queue = NULL; + q->nr = q->alloc = 0; + + return result; +} + +static int is_summary_empty(const struct diff_queue_struct *q) +{ + int i; + + for (i = 0; i < q->nr; i++) { + const struct diff_filepair *p = q->queue[i]; + + switch (p->status) { + case DIFF_STATUS_DELETED: + case DIFF_STATUS_ADDED: + case DIFF_STATUS_COPIED: + case DIFF_STATUS_RENAMED: + return 0; + default: + if (p->score) + return 0; + if (p->one->mode && p->two->mode && + p->one->mode != p->two->mode) + return 0; + break; + } + } + return 1; +} + +void diff_flush(struct diff_options *options) +{ + struct diff_queue_struct *q = &diff_queued_diff; + int i, output_format = options->output_format; + int separator = 0; + + /* + * Order: raw, stat, summary, patch + * or: name/name-status/checkdiff (other bits clear) + */ + if (!q->nr) + goto free_queue; + + if (output_format & (DIFF_FORMAT_RAW | + DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS | + DIFF_FORMAT_CHECKDIFF)) { + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + flush_one_pair(p, options); + } + separator++; + } + + if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) { + struct diffstat_t diffstat; + + memset(&diffstat, 0, sizeof(struct diffstat_t)); + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_stat(p, options, &diffstat); + } + if (output_format & DIFF_FORMAT_NUMSTAT) + show_numstat(&diffstat, options); + if (output_format & DIFF_FORMAT_DIFFSTAT) + show_stats(&diffstat, options); + if (output_format & DIFF_FORMAT_SHORTSTAT) + show_shortstats(&diffstat, options); + free_diffstat_info(&diffstat); + separator++; + } + if (output_format & DIFF_FORMAT_DIRSTAT) + show_dirstat(options); + + if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) { + for (i = 0; i < q->nr; i++) + diff_summary(options->file, q->queue[i]); + separator++; + } + + if (output_format & DIFF_FORMAT_PATCH) { + if (separator) { + putc(options->line_termination, options->file); + if (options->stat_sep) { + /* attach patch instead of inline */ + fputs(options->stat_sep, options->file); + } + } + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (check_pair_status(p)) + diff_flush_patch(p, options); + } + } + + if (output_format & DIFF_FORMAT_CALLBACK) + options->format_callback(q, options, options->format_callback_data); + + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); +free_queue: + free(q->queue); + q->queue = NULL; + q->nr = q->alloc = 0; + if (options->close_file) + fclose(options->file); +} + +static void diffcore_apply_filter(const char *filter) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + outq.queue = NULL; + outq.nr = outq.alloc = 0; + + if (!filter) + return; + + if (strchr(filter, DIFF_STATUS_FILTER_AON)) { + int found; + for (i = found = 0; !found && i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + if (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + strchr(filter, DIFF_STATUS_FILTER_BROKEN)) || + (!p->score && + strchr(filter, DIFF_STATUS_MODIFIED)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + strchr(filter, p->status))) + found++; + } + if (found) + return; + + /* otherwise we will clear the whole queue + * by copying the empty outq at the end of this + * function, but first clear the current entries + * in the queue. + */ + for (i = 0; i < q->nr; i++) + diff_free_filepair(q->queue[i]); + } + else { + /* Only the matching ones */ + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + if (((p->status == DIFF_STATUS_MODIFIED) && + ((p->score && + strchr(filter, DIFF_STATUS_FILTER_BROKEN)) || + (!p->score && + strchr(filter, DIFF_STATUS_MODIFIED)))) || + ((p->status != DIFF_STATUS_MODIFIED) && + strchr(filter, p->status))) + diff_q(&outq, p); + else + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +/* Check whether two filespecs with the same mode and size are identical */ +static int diff_filespec_is_identical(struct diff_filespec *one, + struct diff_filespec *two) +{ + if (S_ISGITLINK(one->mode)) + return 0; + if (diff_populate_filespec(one, 0)) + return 0; + if (diff_populate_filespec(two, 0)) + return 0; + return !memcmp(one->data, two->data, one->size); +} + +static void diffcore_skip_stat_unmatch(struct diff_options *diffopt) +{ + int i; + struct diff_queue_struct *q = &diff_queued_diff; + struct diff_queue_struct outq; + outq.queue = NULL; + outq.nr = outq.alloc = 0; + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + + /* + * 1. Entries that come from stat info dirtyness + * always have both sides (iow, not create/delete), + * one side of the object name is unknown, with + * the same mode and size. Keep the ones that + * do not match these criteria. They have real + * differences. + * + * 2. At this point, the file is known to be modified, + * with the same mode and size, and the object + * name of one side is unknown. Need to inspect + * the identical contents. + */ + if (!DIFF_FILE_VALID(p->one) || /* (1) */ + !DIFF_FILE_VALID(p->two) || + (p->one->sha1_valid && p->two->sha1_valid) || + (p->one->mode != p->two->mode) || + diff_populate_filespec(p->one, 1) || + diff_populate_filespec(p->two, 1) || + (p->one->size != p->two->size) || + !diff_filespec_is_identical(p->one, p->two)) /* (2) */ + diff_q(&outq, p); + else { + /* + * The caller can subtract 1 from skip_stat_unmatch + * to determine how many paths were dirty only + * due to stat info mismatch. + */ + if (!DIFF_OPT_TST(diffopt, NO_INDEX)) + diffopt->skip_stat_unmatch++; + diff_free_filepair(p); + } + } + free(q->queue); + *q = outq; +} + +void diffcore_std(struct diff_options *options) +{ + if (options->skip_stat_unmatch) + diffcore_skip_stat_unmatch(options); + if (options->break_opt != -1) + diffcore_break(options->break_opt); + if (options->detect_rename) + diffcore_rename(options); + if (options->break_opt != -1) + diffcore_merge_broken(); + if (options->pickaxe) + diffcore_pickaxe(options->pickaxe, options->pickaxe_opts); + if (options->orderfile) + diffcore_order(options->orderfile); + diff_resolve_rename_copy(); + diffcore_apply_filter(options->filter); + + if (diff_queued_diff.nr) + DIFF_OPT_SET(options, HAS_CHANGES); + else + DIFF_OPT_CLR(options, HAS_CHANGES); +} + +int diff_result_code(struct diff_options *opt, int status) +{ + int result = 0; + if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && + !(opt->output_format & DIFF_FORMAT_CHECKDIFF)) + return status; + if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && + DIFF_OPT_TST(opt, HAS_CHANGES)) + result |= 01; + if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) && + DIFF_OPT_TST(opt, CHECK_FAILED)) + result |= 02; + return result; +} + +void diff_addremove(struct diff_options *options, + int addremove, unsigned mode, + const unsigned char *sha1, + const char *concatpath) +{ + struct diff_filespec *one, *two; + + if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode)) + return; + + /* This may look odd, but it is a preparation for + * feeding "there are unchanged files which should + * not produce diffs, but when you are doing copy + * detection you would need them, so here they are" + * entries to the diff-core. They will be prefixed + * with something like '=' or '*' (I haven't decided + * which but should not make any difference). + * Feeding the same new and old to diff_change() + * also has the same effect. + * Before the final output happens, they are pruned after + * merged into rename/copy pairs as appropriate. + */ + if (DIFF_OPT_TST(options, REVERSE_DIFF)) + addremove = (addremove == '+' ? '-' : + addremove == '-' ? '+' : addremove); + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + + if (addremove != '+') + fill_filespec(one, sha1, mode); + if (addremove != '-') + fill_filespec(two, sha1, mode); + + diff_queue(&diff_queued_diff, one, two); + DIFF_OPT_SET(options, HAS_CHANGES); +} + +void diff_change(struct diff_options *options, + unsigned old_mode, unsigned new_mode, + const unsigned char *old_sha1, + const unsigned char *new_sha1, + const char *concatpath) +{ + struct diff_filespec *one, *two; + + if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode) + && S_ISGITLINK(new_mode)) + return; + + if (DIFF_OPT_TST(options, REVERSE_DIFF)) { + unsigned tmp; + const unsigned char *tmp_c; + tmp = old_mode; old_mode = new_mode; new_mode = tmp; + tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c; + } + + if (options->prefix && + strncmp(concatpath, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(concatpath); + two = alloc_filespec(concatpath); + fill_filespec(one, old_sha1, old_mode); + fill_filespec(two, new_sha1, new_mode); + + diff_queue(&diff_queued_diff, one, two); + DIFF_OPT_SET(options, HAS_CHANGES); +} + +void diff_unmerge(struct diff_options *options, + const char *path, + unsigned mode, const unsigned char *sha1) +{ + struct diff_filespec *one, *two; + + if (options->prefix && + strncmp(path, options->prefix, options->prefix_length)) + return; + + one = alloc_filespec(path); + two = alloc_filespec(path); + fill_filespec(one, sha1, mode); + diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1; +} + +static char *run_textconv(const char *pgm, struct diff_filespec *spec, + size_t *outsize) +{ + struct diff_tempfile *temp; + const char *argv[3]; + const char **arg = argv; + struct child_process child; + struct strbuf buf = STRBUF_INIT; + + temp = prepare_temp_file(spec->path, spec); + *arg++ = pgm; + *arg++ = temp->name; + *arg = NULL; + + memset(&child, 0, sizeof(child)); + child.argv = argv; + child.out = -1; + if (start_command(&child) != 0 || + strbuf_read(&buf, child.out, 0) < 0 || + finish_command(&child) != 0) { + strbuf_release(&buf); + remove_tempfile(); + error("error running textconv command '%s'", pgm); + return NULL; + } + remove_tempfile(); + + return strbuf_detach(&buf, outsize); +} |