From 679212836a881b53382ea6bd811f38e00705d50d Mon Sep 17 00:00:00 2001 From: Bernhard Reutner-Fischer Date: Thu, 17 Jul 2008 11:59:13 +0000 Subject: - fix segfault in nameif with mactab file (by fixing and shrink config parser) function old new delta config_free_data - 37 +37 config_open 43 48 +5 pack_gzip 1658 1660 +2 nameif_main 527 525 -2 SynchronizeFile 629 623 -6 make_device 1184 1176 -8 config_close 31 18 -13 config_read 431 393 -38 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/5 up/down: 44/-67) Total: -23 bytes --- libbb/parse_config.c | 85 ++++++++++++++++++++++++++-------------------------- 1 file changed, 42 insertions(+), 43 deletions(-) (limited to 'libbb/parse_config.c') diff --git a/libbb/parse_config.c b/libbb/parse_config.c index f07099285..70f933fe3 100644 --- a/libbb/parse_config.c +++ b/libbb/parse_config.c @@ -31,44 +31,42 @@ Typical usage: */ -FILE* FAST_FUNC config_open(parser_t *parser, const char *filename) +parser_t* FAST_FUNC config_open(const char *filename) { - // empty file configures nothing! + parser_t *parser = xzalloc(sizeof(parser_t)); + /* empty file configures nothing */ parser->fp = fopen_or_warn(filename, "r"); - if (!parser->fp) - return parser->fp; - - // init parser - parser->line = NULL; - parser->lineno = 0; - - return parser->fp; + if (parser->fp) + return parser; + config_close (parser); + if (ENABLE_FEATURE_CLEAN_UP) + free(parser); + return NULL; } -void FAST_FUNC config_close(parser_t *parser) +static void config_free_data(parser_t *const parser) { free(parser->line); free(parser->data); + parser->line = 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) +int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char*delims,char comment) { char *line, *q; - int token_num, len; - int noreduce = (ntokens < 0); // do not treat subsequent delimiters as one delimiter - - if (ntokens < 0) + int ii; + /* do not treat subsequent delimiters as one delimiter */ + bool noreduce = (ntokens < 0); + if (noreduce) ntokens = -ntokens; - // nullify tokens memset(tokens, 0, sizeof(void *) * ntokens); - - // free used line - free(parser->line); - parser->line = NULL; - free(parser->data); - parser->data = NULL; + config_free_data(parser); while (1) { int n; @@ -82,13 +80,13 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint parser->lineno++; // handle continuations. Tito's code stolen :) while (1) { - len = strlen(line); - if (!len) - goto free_and_cont; - if (line[len - 1] != '\\') + ii = strlen(line); + if (!ii) + goto next_line; + if (line[ii - 1] != '\\') break; // multi-line object - line[--len] = '\0'; + line[--ii] = '\0'; //TODO: add xmalloc_fgetline-like iface but with appending to existing str q = xmalloc_fgetline(parser->fp); if (q) { @@ -101,34 +99,35 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint if (comment) { q = strchrnul(line, comment); *q = '\0'; - len = q - line; + ii = q - line; } // skip leading delimiters n = strspn(line, delims); if (n) { - len -= n; + ii -= n; strcpy(line, line + n); } - if (len) + if (ii) break; - // skip empty lines - free_and_cont: + + next_line: + /* skip empty line */ free(line); } // non-empty line found, parse and return // store line - parser->line = line = xrealloc(line, len + 1); + parser->line = line = xrealloc(line, ii + 1); parser->data = xstrdup(line); // now split line to tokens //TODO: discard consecutive delimiters? - token_num = 0; + ii = 0; ntokens--; // now it's max allowed token no while (1) { // get next token - if (token_num == ntokens) + if (ii == ntokens) break; q = line + strcspn(line, delims); if (!*q) @@ -136,20 +135,20 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint // pin token *q++ = '\0'; if (noreduce || *line) { - tokens[token_num++] = line; -//bb_error_msg("L[%d] T[%s]", token_num, 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[token_num++] = line; + tokens[ii++] = line; - if (token_num < mintokens) + if (ii < mintokens) bb_error_msg_and_die("bad line %u: %d tokens found, %d needed", - parser->lineno, token_num, mintokens); + parser->lineno, ii, mintokens); - return token_num; + return ii; } -- cgit v1.2.3