diff options
author | Denis Vlasenko <vda.linux@googlemail.com> | 2008-07-19 13:27:19 +0400 |
---|---|---|
committer | Denis Vlasenko <vda.linux@googlemail.com> | 2008-07-19 13:27:19 +0400 |
commit | 2e157ddf9ecd9d58864425f0e87409ddc218df94 (patch) | |
tree | 18f415d4847897a12d790b545f94c32ae68c199c /libbb | |
parent | bd28f6bf7f53ede8df39112d40cb52f2a3d00177 (diff) |
libbb: updated config_parse() from Vladimir
function old new delta
config_read 385 460 +75
runsvdir_main 1701 1716 +15
readit 331 338 +7
passwd_main 1049 1053 +4
parse_command 1504 1507 +3
decode_format_string 822 824 +2
bb__parsespent 117 119 +2
udhcp_get_option 221 222 +1
changepath 196 194 -2
parse_inittab 400 396 -4
nameif_main 683 679 -4
make_device 1176 1172 -4
config_open 48 40 -8
expand_main 698 689 -9
readcmd 1012 1002 -10
config_free_data 37 21 -16
SynchronizeFile 683 643 -40
sleep_main 474 362 -112
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 8/10 up/down: 109/-209) Total: -100 bytes
Diffstat (limited to 'libbb')
-rw-r--r-- | libbb/parse_config.c | 148 |
1 files changed, 107 insertions, 41 deletions
diff --git a/libbb/parse_config.c b/libbb/parse_config.c index 5f6dbbde1..3945501ad 100644 --- a/libbb/parse_config.c +++ b/libbb/parse_config.c @@ -9,23 +9,51 @@ #include "libbb.h" +#if ENABLE_PARSE +int parse_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int parse_main(int argc UNUSED_PARAM, char **argv) +{ + const char *delims = "# \t"; + unsigned flags = 0; + int mintokens = 0, ntokens = 128; + opt_complementary = "-1:n+:m+:f+"; + getopt32(argv, "n:m:d:f:", &ntokens, &mintokens, &delims, &flags); + //argc -= optind; + argv += optind; + while (*argv) { + parser_t *p = config_open(*argv); + if (p) { + int n; + char **t = xmalloc(sizeof(char *) * ntokens); + while ((n = config_read(p, t, ntokens, mintokens, delims, flags)) > 0) { + for (int i = 0; i < n; ++i) + printf("[%s]", t[i]); + puts(""); + } + config_close(p); + } + argv++; + } + return EXIT_SUCCESS; +} +#endif + /* Typical usage: ----- CUT ----- char *t[3]; // tokens placeholder - parser_t p; // parser structure - // open file - if (config_open(filename, &p)) { + parser_t *p = config_open(filename); + if (p) { // parse line-by-line - while (*config_read(&p, t, 3, 0, delimiters, comment_char) >= 0) { // 0..3 tokens + while (config_read(p, t, 3, 0, delimiters, flags)) { // 1..3 tokens // use tokens bb_error_msg("TOKENS: [%s][%s][%s]", t[0], t[1], t[2]); } ... // free parser - config_close(&p); + config_close(p); } ----- CUT ----- @@ -35,44 +63,69 @@ parser_t* FAST_FUNC config_open(const char *filename) { parser_t *parser = xzalloc(sizeof(parser_t)); /* empty file configures nothing */ - parser->fp = fopen_or_warn(filename, "r"); + parser->fp = fopen_or_warn_stdin(filename); if (parser->fp) return parser; - config_close (parser); if (ENABLE_FEATURE_CLEAN_UP) - free(parser); + free(parser); return NULL; } static void config_free_data(parser_t *const parser) { free(parser->line); - free(parser->data); - parser->line = parser->data = NULL; + parser->line = NULL; + USE_FEATURE_PARSE_COPY( + free(parser->data); + parser->data = NULL; + ) } + void FAST_FUNC config_close(parser_t *parser) { config_free_data(parser); fclose(parser->fp); } -int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) +/* +1. Read a line from config file. If nothing to read then bail out returning 0. + Handle continuation character. Advance lineno for each physical line. Cut comments. +2. if PARSE_DONT_TRIM is not set (default) skip leading and cut trailing delimiters, if any. +3. If resulting line is empty goto 1. +4. Look for first delimiter. If PARSE_DONT_REDUCE or PARSE_DONT_TRIM is set then pin empty token. +5. Else (default) if number of seen tokens is equal to max number of tokens (token is the last one) + and PARSE_LAST_IS_GREEDY is set then pin the remainder of the line as the last token. + Else (token is not last or PARSE_LAST_IS_GREEDY is not set) just replace first delimiter with '\0' + thus delimiting token and pin it. +6. Advance line pointer past the end of token. If number of seen tokens is less than required number + of tokens then goto 4. +7. Control the number of seen tokens is not less the min number of tokens. Die if condition is not met. +8. Return the number of seen tokens. + +mintokens > 0 make config_read() exit with error message if less than mintokens +(but more than 0) are found. Empty lines are always skipped (not warned about). +*/ +#undef config_read +int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims) { char *line, *q; - int ii, seen; - /* do not treat consecutive delimiters as one delimiter */ - bool noreduce = (ntokens < 0); - if (noreduce) - ntokens = -ntokens; - - memset(tokens, 0, sizeof(tokens[0]) * ntokens); + char comment = *delims++; + int ii; + int ntokens = flags & 0xFF; + int mintokens = (flags & 0xFF00) >> 8; + + /* + // N.B. this could only be used in read-in-one-go version, or when tokens use xstrdup(). TODO + if (!parser->lineno || !(flags & PARSE_DONT_NULL)) + */ + memset(tokens, 0, sizeof(tokens[0]) * ntokens); config_free_data(parser); while (1) { //TODO: speed up xmalloc_fgetline by internally using fgets, not fgetc line = xmalloc_fgetline(parser->fp); if (!line) - return -1; + return 0; parser->lineno++; // handle continuations. Tito's code stolen :) @@ -98,12 +151,22 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint *q = '\0'; ii = q - line; } - // skip leading delimiters - seen = strspn(line, delims); - if (seen) { - ii -= seen; - strcpy(line, line + seen); + // skip leading and trailing delimiters + if (!(flags & PARSE_DONT_TRIM)) { + // skip leading + int n = strspn(line, delims); + if (n) { + ii -= n; + strcpy(line, line + n); + } + // cut trailing + if (ii) { + while (strchr(delims, line[--ii])) + continue; + line[++ii] = '\0'; + } } + // if something still remains -> return it if (ii) break; @@ -112,36 +175,39 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint free(line); } - // non-empty line found, parse and return + // non-empty line found, parse and return the number of tokens // store line parser->line = line = xrealloc(line, ii + 1); - parser->data = xstrdup(line); + USE_FEATURE_PARSE_COPY( + parser->data = xstrdup(line); + ) /* now split line to tokens */ - ii = noreduce ? seen : 0; ntokens--; // now it's max allowed token no - while (1) { + // N.B, non-empty remainder is also a token, + // so if ntokens <= 1, we just return the whole line + // N.B. if PARSE_LAST_IS_GREEDY is set the remainder of the line is stuck to the last token + for (ii = 0; *line && ii <= ntokens; ) { + //bb_info_msg("L[%s]", line); // get next token - if (ii == ntokens) - break; - q = line + strcspn(line, delims); - if (!*q) - break; + // at the last token and need greedy token -> + if ((flags & PARSE_LAST_IS_GREEDY) && (ii == ntokens)) { + // ... don't cut the line + q = line + strlen(line); + } else { + // vanilla token. cut the line at the first delim + q = line + strcspn(line, delims); + *q++ = '\0'; + } // pin token - *q++ = '\0'; - if (noreduce || *line) { + if ((flags & (PARSE_DONT_REDUCE|PARSE_DONT_TRIM)) || *line) { + //bb_info_msg("N[%d] T[%s]", ii, line); tokens[ii++] = line; -//bb_info_msg("L[%d] T[%s]\n", ii, line); } line = q; } - // non-empty remainder is also a token, - // so if ntokens <= 1, we just return the whole line - if (noreduce || *line) - tokens[ii++] = line; - if (ii < mintokens) bb_error_msg_and_die("bad line %u: %d tokens found, %d needed", parser->lineno, ii, mintokens); |