From c01340fe26b76e172805ff641ad9af6bc45cdc91 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Wed, 16 Jul 2008 22:12:18 +0000 Subject: [PATCH] update of config file parser from Vladimir --- include/libbb.h | 20 ++------ libbb/parse_config.c | 106 +++---------------------------------------- miscutils/crond.c | 83 ++++++++++++++------------------- networking/nameif.c | 20 +++----- 4 files changed, 52 insertions(+), 177 deletions(-) diff --git a/include/libbb.h b/include/libbb.h index 3a7c2eee9..c124b1a5e 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -985,30 +985,20 @@ extern int set_loop(char **devname, const char *file, unsigned long long offset) char *bb_askpass(int timeout, const char * prompt) FAST_FUNC; int bb_ask_confirmation(void) FAST_FUNC; -extern int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC; +int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC; /* * Uniform config file parser helpers */ -#define PARSER_STDIO_BASED 1 -#if !PARSER_STDIO_BASED -typedef struct parser_t { - char *data; - char *line; - int lineno; -} parser_t; -extern char* config_open(parser_t *parser, const char *filename) FAST_FUNC; -#else typedef struct parser_t { FILE *fp; - char *line; + char *line, *data; int lineno; } parser_t; -extern FILE* config_open(parser_t *parser, const char *filename) FAST_FUNC; -#endif +FILE* config_open(parser_t *parser, const char *filename) FAST_FUNC; /* TODO: add define magic to collapse ntokens/mintokens/comment into one int param */ -extern char* config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) FAST_FUNC; -extern void config_close(parser_t *parser) FAST_FUNC; +int config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) FAST_FUNC; +void config_close(parser_t *parser) FAST_FUNC; /* Concatenate path and filename to new allocated buffer. * Add "/" only as needed (no duplicate "//" are produced). diff --git a/libbb/parse_config.c b/libbb/parse_config.c index 6612db367..e63204b09 100644 --- a/libbb/parse_config.c +++ b/libbb/parse_config.c @@ -31,101 +31,6 @@ Typical usage: */ -#if !PARSER_STDIO_BASED - -char* FAST_FUNC config_open(parser_t *parser, const char *filename) -{ - // empty file configures nothing! - char *data = xmalloc_open_read_close(filename, NULL); - if (!data) - return data; - - // convert 0x5c 0x0a (backslashes at the very end of line) to 0x20 0x20 (spaces) - for (char *s = data; (s = strchr(s, '\\')) != NULL; ++s) - if ('\n' == s[1]) { - s[0] = s[1] = ' '; - } - - // init parser - parser->line = parser->data = data; - parser->lineno = 0; - - return data; -} - -void FAST_FUNC config_close(parser_t *parser) -{ - // for now just free config data - free(parser->data); -} - -char* FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) -{ - char *ret, *line; - int noreduce = (ntokens<0); // do not treat subsequent delimiters as one delimiter - if (ntokens < 0) - ntokens = -ntokens; - ret = line = parser->line; - // nullify tokens - memset(tokens, 0, sizeof(void *) * ntokens); - // now split to lines - while (*line) { - int token_num = 0; - // limit the line - char *ptr = strchrnul(line, '\n'); - *ptr++ = '\0'; - // line number - parser->lineno++; - // comments mean EOLs - if (comment) - *strchrnul(line, comment) = '\0'; - // skip leading delimiters - while (*line && strchr(delims, *line)) - line++; - // skip empty lines - if (*line) { - char *s; - // now split line to tokens - s = line; - while (s) { - char *p; - // get next token - if (token_num+1 >= ntokens) - break; - p = s; - while (*p && !strchr(delims, *p)) - p++; - if (!*p) - break; - *p++ = '\0'; - // pin token - if (noreduce || *s) { - tokens[token_num++] = s; -//bb_error_msg("L[%d] T[%s]", token_num, s); - } - s = p; - } - // non-empty remainder is also a token. So if ntokens == 0, we just return the whole line - if (s && (noreduce || *s)) - tokens[token_num++] = s; - // sanity check: have we got all required tokens? - if (token_num < mintokens) - bb_error_msg_and_die("bad line %u, %d tokens found, %d needed", parser->lineno, token_num, mintokens); - // advance data for the next call - line = ptr; - break; - } - // line didn't contain any token -> try next line - ret = line = ptr; - } - parser->line = line; - - // return current line. caller must check *ret to determine whether to continue - return ret; -} - -#else // stdio-based - FILE* FAST_FUNC config_open(parser_t *parser, const char *filename) { // empty file configures nothing! @@ -142,10 +47,12 @@ FILE* FAST_FUNC config_open(parser_t *parser, const char *filename) void FAST_FUNC config_close(parser_t *parser) { + free(parser->line); + free(parser->data); fclose(parser->fp); } -char* 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; @@ -160,6 +67,8 @@ char* FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mi // free used line free(parser->line); parser->line = NULL; + free(parser->data); + parser->data = NULL; while (1) { int n; @@ -211,6 +120,7 @@ char* FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mi // store line parser->line = line = xrealloc(line, len + 1); + parser->data = xstrdup(line); // now split line to tokens //TODO: discard consecutive delimiters? @@ -241,7 +151,5 @@ char* FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mi bb_error_msg_and_die("bad line %u: %d tokens found, %d needed", parser->lineno, token_num, mintokens); - return parser->line; // maybe token_num instead? + return token_num; } - -#endif diff --git a/miscutils/crond.c b/miscutils/crond.c index e48abf9f8..af37bb15b 100644 --- a/miscutils/crond.c +++ b/miscutils/crond.c @@ -304,7 +304,7 @@ static const char MonAry[] ALIGN1 = /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */ ; -static char *ParseField(char *user, char *ary, int modvalue, int off, +static void ParseField(char *user, char *ary, int modvalue, int off, const char *names, char *ptr) /* 'names' is a pointer to a set of 3-char abbreviations */ { @@ -312,11 +312,11 @@ static char *ParseField(char *user, char *ary, int modvalue, int off, int n1 = -1; int n2 = -1; - if (base == NULL) { - return NULL; - } + // this can't happen due to config_read() + /*if (base == NULL) + return;*/ - while (!isspace(*ptr)) { + while (1) { int skip = 0; /* Handle numeric digit or symbol or '*' */ @@ -352,8 +352,7 @@ static char *ParseField(char *user, char *ary, int modvalue, int off, /* handle optional range '-' */ if (skip == 0) { - crondlog(WARN9 "user %s: parse error at %s", user, base); - return NULL; + goto err; } if (*ptr == '-' && n2 < 0) { ++ptr; @@ -388,8 +387,7 @@ static char *ParseField(char *user, char *ary, int modvalue, int off, s0 = skip; } if (--failsafe == 0) { - crondlog(WARN9 "user %s: parse error at %s", user, base); - return NULL; + goto err; } } while (n1 != n2); @@ -402,9 +400,10 @@ static char *ParseField(char *user, char *ary, int modvalue, int off, n2 = -1; } - if (!isspace(*ptr)) { + if (*ptr) { + err: crondlog(WARN9 "user %s: parse error at %s", user, base); - return NULL; + return; } if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */ @@ -414,7 +413,6 @@ static char *ParseField(char *user, char *ary, int modvalue, int off, fprintf(stderr, "%d", (unsigned char)ary[i]); fputc('\n', stderr); } - return skip_whitespace(ptr); } static void FixDayDow(CronLine *line) @@ -445,11 +443,10 @@ static void FixDayDow(CronLine *line) static void SynchronizeFile(const char *fileName) { - FILE *fi; + struct parser_t parser; struct stat sbuf; - int maxEntries; int maxLines; - char buf[1024]; + char *tokens[6]; #if ENABLE_FEATURE_CROND_CALL_SENDMAIL char *mailTo = NULL; #endif @@ -458,57 +455,44 @@ static void SynchronizeFile(const char *fileName) return; DeleteFile(fileName); - fi = fopen(fileName, "r"); - if (!fi) + if (!config_open(&parser, fileName)) return; - maxEntries = MAXLINES; - if (strcmp(fileName, "root") == 0) { - maxEntries = 65535; - } - maxLines = maxEntries * 10; + maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES; - if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { + if (fstat(fileno(parser.fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { CronFile *file = xzalloc(sizeof(CronFile)); CronLine **pline; + int n; file->cf_User = xstrdup(fileName); pline = &file->cf_LineBase; - while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) { + while (--maxLines && (n=config_read(&parser, tokens, 6, 0, " \t", '#')) > 0) { CronLine *line; - char *ptr; - trim(buf); - if (buf[0] == '\0' || buf[0] == '#') { - continue; - } - if (--maxEntries == 0) { - break; - } if (DebugOpt) { - crondlog(LVL5 "user:%s entry:%s", fileName, buf); + crondlog(LVL5 "user:%s entry:%s", fileName, parser.data); } + /* check if line is setting MAILTO= */ - if (0 == strncmp("MAILTO=", buf, 7)) { + if (0 == strncmp(tokens[0], "MAILTO=", 7)) { #if ENABLE_FEATURE_CROND_CALL_SENDMAIL free(mailTo); - mailTo = (buf[7]) ? xstrdup(buf+7) : NULL; + mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL; #endif /* otherwise just ignore such lines */ continue; } + /* check if a minimum of tokens is specified */ + if (n < 5) + continue; *pline = line = xzalloc(sizeof(CronLine)); /* parse date ranges */ - ptr = ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, buf); - ptr = ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, ptr); - ptr = ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, ptr); - ptr = ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, ptr); - ptr = ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, ptr); - /* check failure */ - if (ptr == NULL) { - free(line); - continue; - } + ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, tokens[0]); + ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, tokens[1]); + ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, tokens[2]); + ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, tokens[3]); + ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, tokens[4]); /* * fix days and dow - if one is not "*" and the other * is "*", the other is set to 0, and vise-versa @@ -519,22 +503,23 @@ static void SynchronizeFile(const char *fileName) line->cl_MailTo = xstrdup(mailTo); #endif /* copy command */ - line->cl_Shell = xstrdup(ptr); + line->cl_Shell = xstrdup(tokens[5]); if (DebugOpt) { - crondlog(LVL5 " command:%s", ptr); + crondlog(LVL5 " command:%s", tokens[5]); } pline = &line->cl_Next; +//bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]); } *pline = NULL; file->cf_Next = FileBase; FileBase = file; - if (maxLines == 0 || maxEntries == 0) { + if (maxLines == 0) { crondlog(WARN9 "user %s: too many lines", fileName); } } - fclose(fi); + config_close(&parser); } static void CheckUpdates(void) diff --git a/networking/nameif.c b/networking/nameif.c index f3d333baf..506f4fa1c 100644 --- a/networking/nameif.c +++ b/networking/nameif.c @@ -160,21 +160,13 @@ int nameif_main(int argc, char **argv) prepend_new_eth_table(&clist, ifname, *argv++); } } else { - ifh = xfopen(fname, "r"); - while ((line = xmalloc_fgets(ifh)) != NULL) { - char *next; - - line_ptr = skip_whitespace(line); - if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) - goto read_next_line; - next = skip_non_whitespace(line_ptr); - if (*next) - *next++ = '\0'; - prepend_new_eth_table(&clist, line_ptr, next); - read_next_line: - free(line); + struct parser_t parser; + if (config_open(&parser, fname)) { + char *tokens[2]; + while (config_read(&parser, tokens, 2, 2, " \t", '#')) + prepend_new_eth_table(&clist, tokens[0], tokens[1]); + config_close(&parser); } - fclose(ifh); } ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);