diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2006-12-27 07:35:04 +0300 |
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committer | Denis Vlasenko <vda.linux@googlemail.com> | 2006-12-27 07:35:04 +0300 |
commit | 8d42f86b146871ae4c4cafd3801a85f381249a14 (patch) | |
tree | b963999fc54eddb65f1929b894f868e24851fc9c /findutils/grep.c |
Correcting branch name to be like previous ones
Diffstat (limited to 'findutils/grep.c')
-rw-r--r-- | findutils/grep.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/findutils/grep.c b/findutils/grep.c new file mode 100644 index 000000000..8bb38f95c --- /dev/null +++ b/findutils/grep.c @@ -0,0 +1,483 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini grep implementation for busybox using libc regex. + * + * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley + * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org> + * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. + */ +/* BB_AUDIT SUSv3 defects - unsupported option -x. */ +/* BB_AUDIT GNU defects - always acts as -a. */ +/* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */ +/* + * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> - + * correction "-e pattern1 -e pattern2" logic and more optimizations. + * precompiled regex + */ +/* + * (C) 2006 Jac Goudsmit added -o option + */ + +#include "busybox.h" +#include "xregex.h" + + +/* options */ +#define GREP_OPTS "lnqvscFiHhe:f:Lor" +#define GREP_OPT_l (1<<0) +#define PRINT_FILES_WITH_MATCHES (option_mask32 & GREP_OPT_l) +#define GREP_OPT_n (1<<1) +#define PRINT_LINE_NUM (option_mask32 & GREP_OPT_n) +#define GREP_OPT_q (1<<2) +#define BE_QUIET (option_mask32 & GREP_OPT_q) +#define GREP_OPT_v (1<<3) +#define GREP_OPT_s (1<<4) +#define SUPPRESS_ERR_MSGS (option_mask32 & GREP_OPT_s) +#define GREP_OPT_c (1<<5) +#define PRINT_MATCH_COUNTS (option_mask32 & GREP_OPT_c) +#define GREP_OPT_F (1<<6) +#define FGREP_FLAG (option_mask32 & GREP_OPT_F) +#define GREP_OPT_i (1<<7) +#define GREP_OPT_H (1<<8) +#define GREP_OPT_h (1<<9) +#define GREP_OPT_e (1<<10) +#define GREP_OPT_f (1<<11) +#define GREP_OPT_L (1<<12) +#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & GREP_OPT_L) +#define GREP_OPT_o (1<<13) +#define GREP_OPT_r (1<<14) +#if ENABLE_FEATURE_GREP_CONTEXT +# define GREP_OPT_CONTEXT "A:B:C:" +# define GREP_OPT_A (1<<15) +# define GREP_OPT_B (1<<16) +# define GREP_OPT_C (1<<17) +# define GREP_OPT_E (1<<18) +#else +# define GREP_OPT_CONTEXT "" +# define GREP_OPT_A 0 +# define GREP_OPT_B 0 +# define GREP_OPT_C 0 +# define GREP_OPT_E (1<<15) +#endif +#if ENABLE_FEATURE_GREP_EGREP_ALIAS +# define OPT_EGREP "E" +#else +# define OPT_EGREP "" +#endif + +typedef unsigned char byte_t; + +static int reflags; +static byte_t invert_search; +static byte_t print_filename; +static byte_t open_errors; + +#if ENABLE_FEATURE_GREP_CONTEXT +static int lines_before; +static int lines_after; +static char **before_buf; +static int last_line_printed; +#endif /* ENABLE_FEATURE_GREP_CONTEXT */ + +/* globals used internally */ +static llist_t *pattern_head; /* growable list of patterns to match */ +static const char *cur_file; /* the current file we are reading */ + +typedef struct GREP_LIST_DATA { + char *pattern; + regex_t preg; +#define PATTERN_MEM_A 1 +#define COMPILED 2 + int flg_mem_alocated_compiled; +} grep_list_data_t; + +static void print_line(const char *line, int linenum, char decoration) +{ +#if ENABLE_FEATURE_GREP_CONTEXT + /* possibly print the little '--' separator */ + if ((lines_before || lines_after) && last_line_printed && + last_line_printed < linenum - 1) { + puts("--"); + } + last_line_printed = linenum; +#endif + if (print_filename) + printf("%s%c", cur_file, decoration); + if (PRINT_LINE_NUM) + printf("%i%c", linenum, decoration); + /* Emulate weird GNU grep behavior with -ov */ + if ((option_mask32 & (GREP_OPT_v+GREP_OPT_o)) != (GREP_OPT_v+GREP_OPT_o)) + puts(line); +} + + +static int grep_file(FILE *file) +{ + char *line; + byte_t ret; + int linenum = 0; + int nmatches = 0; + regmatch_t regmatch; +#if ENABLE_FEATURE_GREP_CONTEXT + int print_n_lines_after = 0; + int curpos = 0; /* track where we are in the circular 'before' buffer */ + int idx = 0; /* used for iteration through the circular buffer */ +#endif /* ENABLE_FEATURE_GREP_CONTEXT */ + + while ((line = xmalloc_getline(file)) != NULL) { + llist_t *pattern_ptr = pattern_head; + grep_list_data_t * gl; + + linenum++; + ret = 0; + while (pattern_ptr) { + gl = (grep_list_data_t *)pattern_ptr->data; + if (FGREP_FLAG) { + ret = strstr(line, gl->pattern) != NULL; + } else { + /* + * test for a postitive-assertion match (regexec returns success (0) + * and the user did not specify invert search), or a negative-assertion + * match (regexec returns failure (REG_NOMATCH) and the user specified + * invert search) + */ + if (!(gl->flg_mem_alocated_compiled & COMPILED)) { + gl->flg_mem_alocated_compiled |= COMPILED; + xregcomp(&(gl->preg), gl->pattern, reflags); + } + regmatch.rm_so = 0; + regmatch.rm_eo = 0; + ret |= regexec(&(gl->preg), line, 1, ®match, 0) == 0; + } + pattern_ptr = pattern_ptr->link; + } /* while (pattern_ptr) */ + + if (ret ^ invert_search) { + + if (PRINT_FILES_WITH_MATCHES || BE_QUIET) + free(line); + + /* if we found a match but were told to be quiet, stop here */ + if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES) + return -1; + + /* keep track of matches */ + nmatches++; + + /* if we're just printing filenames, we stop after the first match */ + if (PRINT_FILES_WITH_MATCHES) + break; + + /* print the matched line */ + if (PRINT_MATCH_COUNTS == 0) { +#if ENABLE_FEATURE_GREP_CONTEXT + int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; + + /* if we were told to print 'before' lines and there is at least + * one line in the circular buffer, print them */ + if (lines_before && before_buf[prevpos] != NULL) { + int first_buf_entry_line_num = linenum - lines_before; + + /* advance to the first entry in the circular buffer, and + * figure out the line number is of the first line in the + * buffer */ + idx = curpos; + while (before_buf[idx] == NULL) { + idx = (idx + 1) % lines_before; + first_buf_entry_line_num++; + } + + /* now print each line in the buffer, clearing them as we go */ + while (before_buf[idx] != NULL) { + print_line(before_buf[idx], first_buf_entry_line_num, '-'); + free(before_buf[idx]); + before_buf[idx] = NULL; + idx = (idx + 1) % lines_before; + first_buf_entry_line_num++; + } + } + + /* make a note that we need to print 'after' lines */ + print_n_lines_after = lines_after; +#endif + if (option_mask32 & GREP_OPT_o) { + line[regmatch.rm_eo] = '\0'; + print_line(line + regmatch.rm_so, linenum, ':'); + } else { + print_line(line, linenum, ':'); + } + } + } +#if ENABLE_FEATURE_GREP_CONTEXT + else { /* no match */ + /* Add the line to the circular 'before' buffer */ + if (lines_before) { + free(before_buf[curpos]); + before_buf[curpos] = xstrdup(line); + curpos = (curpos + 1) % lines_before; + } + } + + /* if we need to print some context lines after the last match, do so */ + if (print_n_lines_after && (last_line_printed != linenum)) { + print_line(line, linenum, '-'); + print_n_lines_after--; + } +#endif /* ENABLE_FEATURE_GREP_CONTEXT */ + free(line); + } + + /* special-case file post-processing for options where we don't print line + * matches, just filenames and possibly match counts */ + + /* grep -c: print [filename:]count, even if count is zero */ + if (PRINT_MATCH_COUNTS) { + if (print_filename) + printf("%s:", cur_file); + printf("%d\n", nmatches); + } + + /* grep -l: print just the filename, but only if we grepped the line in the file */ + if (PRINT_FILES_WITH_MATCHES && nmatches > 0) { + puts(cur_file); + } + + /* grep -L: print just the filename, but only if we didn't grep the line in the file */ + if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) { + puts(cur_file); + } + + return nmatches; +} + +#if ENABLE_FEATURE_CLEAN_UP +#define new_grep_list_data(p, m) add_grep_list_data(p, m) +static char * add_grep_list_data(char *pattern, int flg_used_mem) +#else +#define new_grep_list_data(p, m) add_grep_list_data(p) +static char * add_grep_list_data(char *pattern) +#endif +{ + grep_list_data_t *gl = xmalloc(sizeof(grep_list_data_t)); + gl->pattern = pattern; +#if ENABLE_FEATURE_CLEAN_UP + gl->flg_mem_alocated_compiled = flg_used_mem; +#else + gl->flg_mem_alocated_compiled = 0; +#endif + return (char *)gl; +} + + +static void load_regexes_from_file(llist_t *fopt) +{ + char *line; + FILE *f; + + while (fopt) { + llist_t *cur = fopt; + char *ffile = cur->data; + + fopt = cur->link; + free(cur); + f = xfopen(ffile, "r"); + while ((line = xmalloc_getline(f)) != NULL) { + llist_add_to(&pattern_head, + new_grep_list_data(line, PATTERN_MEM_A)); + } + } +} + + +static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth) +{ + FILE *file = fopen(filename, "r"); + if (file == NULL) { + if (!SUPPRESS_ERR_MSGS) + bb_perror_msg("%s", cur_file); + open_errors = 1; + return 0; + } + cur_file = filename; + *(int*)matched += grep_file(file); + fclose(file); + return 1; +} + + +static int grep_dir(const char *dir) +{ + int matched = 0; + recursive_action(dir, + /* recurse= */ 1, + /* followLinks= */ 0, + /* depthFirst= */ 1, + /* fileAction= */ file_action_grep, + /* dirAction= */ NULL, + /* userData= */ &matched, + /* depth= */ 0); + return matched; +} + + +int grep_main(int argc, char **argv) +{ + FILE *file; + int matched; + llist_t *fopt = NULL; + + /* do normal option parsing */ +#if ENABLE_FEATURE_GREP_CONTEXT + char *slines_after; + char *slines_before; + char *Copt; + + opt_complementary = "H-h:e::f::C-AB"; + getopt32(argc, argv, + GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP, + &pattern_head, &fopt, + &slines_after, &slines_before, &Copt); + + if (option_mask32 & GREP_OPT_C) { + /* -C unsets prev -A and -B, but following -A or -B + may override it */ + if (!(option_mask32 & GREP_OPT_A)) /* not overridden */ + slines_after = Copt; + if (!(option_mask32 & GREP_OPT_B)) /* not overridden */ + slines_before = Copt; + option_mask32 |= GREP_OPT_A|GREP_OPT_B; /* for parser */ + } + if (option_mask32 & GREP_OPT_A) { + lines_after = xatoi_u(slines_after); + } + if (option_mask32 & GREP_OPT_B) { + lines_before = xatoi_u(slines_before); + } + /* sanity checks */ + if (option_mask32 & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L)) { + option_mask32 &= ~GREP_OPT_n; + lines_before = 0; + lines_after = 0; + } else if (lines_before > 0) + before_buf = (char **)xzalloc(lines_before * sizeof(char *)); +#else + /* with auto sanity checks */ + opt_complementary = "H-h:e::f::c-n:q-n:l-n"; + getopt32(argc, argv, GREP_OPTS OPT_EGREP, + &pattern_head, &fopt); +#endif + invert_search = ((option_mask32 & GREP_OPT_v) != 0); /* 0 | 1 */ + + if (pattern_head != NULL) { + /* convert char *argv[] to grep_list_data_t */ + llist_t *cur; + + for (cur = pattern_head; cur; cur = cur->link) + cur->data = new_grep_list_data(cur->data, 0); + } + if (option_mask32 & GREP_OPT_f) + load_regexes_from_file(fopt); + + if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') + option_mask32 |= GREP_OPT_F; + + if (!(option_mask32 & GREP_OPT_o)) + reflags = REG_NOSUB; + + if (ENABLE_FEATURE_GREP_EGREP_ALIAS && + (applet_name[0] == 'e' || (option_mask32 & GREP_OPT_E))) + reflags |= REG_EXTENDED; + + if (option_mask32 & GREP_OPT_i) + reflags |= REG_ICASE; + + argv += optind; + argc -= optind; + + /* if we didn't get a pattern from a -e and no command file was specified, + * argv[optind] should be the pattern. no pattern, no worky */ + if (pattern_head == NULL) { + if (*argv == NULL) + bb_show_usage(); + else { + char *pattern = new_grep_list_data(*argv++, 0); + + llist_add_to(&pattern_head, pattern); + argc--; + } + } + + /* argv[(optind)..(argc-1)] should be names of file to grep through. If + * there is more than one file to grep, we will print the filenames. */ + if (argc > 1) + print_filename = 1; + /* -H / -h of course override */ + if (option_mask32 & GREP_OPT_H) + print_filename = 1; + if (option_mask32 & GREP_OPT_h) + print_filename = 0; + + /* If no files were specified, or '-' was specified, take input from + * stdin. Otherwise, we grep through all the files specified. */ + if (argc == 0) + argc++; + matched = 0; + while (argc--) { + cur_file = *argv++; + file = stdin; + if (!cur_file || (*cur_file == '-' && !cur_file[1])) { + cur_file = "(standard input)"; + } else { + if (option_mask32 & GREP_OPT_r) { + struct stat st; + if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { + if (!(option_mask32 & GREP_OPT_h)) + print_filename = 1; + matched += grep_dir(cur_file); + goto grep_done; + } + } + /* else: fopen(dir) will succeed, but reading won't */ + file = fopen(cur_file, "r"); + if (file == NULL) { + if (!SUPPRESS_ERR_MSGS) + bb_perror_msg("%s", cur_file); + open_errors = 1; + continue; + } + } + matched += grep_file(file); + fclose_if_not_stdin(file); + grep_done: + if (matched < 0) { + /* we found a match but were told to be quiet, stop here and + * return success */ + break; + } + } + + /* destroy all the elments in the pattern list */ + if (ENABLE_FEATURE_CLEAN_UP) { + while (pattern_head) { + llist_t *pattern_head_ptr = pattern_head; + grep_list_data_t *gl = + (grep_list_data_t *)pattern_head_ptr->data; + + pattern_head = pattern_head->link; + if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A)) + free(gl->pattern); + if ((gl->flg_mem_alocated_compiled & COMPILED)) + regfree(&(gl->preg)); + free(pattern_head_ptr); + } + } + /* 0 = success, 1 = failed, 2 = error */ + /* If the -q option is specified, the exit status shall be zero + * if an input line is selected, even if an error was detected. */ + if (BE_QUIET && matched) + return 0; + if (open_errors) + return 2; + return !matched; /* invert return value 0 = success, 1 = failed */ +} |