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212 lines
5.2 KiB
C
212 lines
5.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* config file parser helper
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*
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* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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* Also for use in uClibc (http://uclibc.org/) licensed under LGPLv2.1 or later.
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*/
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#include "libbb.h"
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#if defined ENABLE_PARSE && ENABLE_PARSE
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int parse_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int parse_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *delims = "# \t";
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unsigned flags = PARSE_NORMAL;
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int mintokens = 0, ntokens = 128;
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opt_complementary = "-1:n+:m+:f+";
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getopt32(argv, "n:m:d:f:", &ntokens, &mintokens, &delims, &flags);
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//argc -= optind;
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argv += optind;
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while (*argv) {
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parser_t *p = config_open(*argv);
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if (p) {
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int n;
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char **t = xmalloc(sizeof(char *) * ntokens);
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while ((n = config_read(p, t, ntokens, mintokens, delims, flags)) != 0) {
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for (int i = 0; i < n; ++i)
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printf("[%s]", t[i]);
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puts("");
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}
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config_close(p);
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}
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argv++;
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}
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return EXIT_SUCCESS;
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}
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#endif
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/*
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Typical usage:
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----- CUT -----
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char *t[3]; // tokens placeholder
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parser_t *p = config_open(filename);
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if (p) {
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// parse line-by-line
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while (config_read(p, t, 3, 0, delimiters, flags)) { // 1..3 tokens
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// use tokens
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bb_error_msg("TOKENS: [%s][%s][%s]", t[0], t[1], t[2]);
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}
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...
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// free parser
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config_close(p);
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}
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----- CUT -----
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*/
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parser_t* FAST_FUNC config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path))
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{
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FILE* fp;
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parser_t *parser;
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fp = fopen_func(filename);
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if (!fp)
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return NULL;
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parser = xzalloc(sizeof(*parser));
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parser->fp = fp;
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return parser;
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}
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parser_t* FAST_FUNC config_open(const char *filename)
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{
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return config_open2(filename, fopen_or_warn_stdin);
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}
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static void config_free_data(parser_t *parser)
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{
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free(parser->line);
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parser->line = NULL;
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if (PARSE_KEEP_COPY) { /* compile-time constant */
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free(parser->data);
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parser->data = NULL;
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}
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}
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void FAST_FUNC config_close(parser_t *parser)
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{
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if (parser) {
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config_free_data(parser);
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fclose(parser->fp);
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free(parser);
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}
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}
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/*
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0. If parser is NULL return 0.
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1. Read a line from config file. If nothing to read then return 0.
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Handle continuation character. Advance lineno for each physical line.
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Discard everything past comment character.
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2. if PARSE_TRIM is set (default), remove leading and trailing delimiters.
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3. If resulting line is empty goto 1.
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4. Look for first delimiter. If !PARSE_COLLAPSE or !PARSE_TRIM is set then
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remember the token as empty.
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5. Else (default) if number of seen tokens is equal to max number of tokens
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(token is the last one) and PARSE_GREEDY is set then the remainder
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of the line is the last token.
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Else (token is not last or PARSE_GREEDY is not set) just replace
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first delimiter with '\0' thus delimiting the token.
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6. Advance line pointer past the end of token. If number of seen tokens
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is less than required number of tokens then goto 4.
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7. Check the number of seen tokens is not less the min number of tokens.
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Complain or die otherwise depending on PARSE_MIN_DIE.
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8. Return the number of seen tokens.
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mintokens > 0 make config_read() print error message if less than mintokens
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(but more than 0) are found. Empty lines are always skipped (not warned about).
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*/
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#undef config_read
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int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims)
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{
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char *line;
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int ntokens, mintokens;
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int t, len;
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ntokens = (uint8_t)flags;
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mintokens = (uint8_t)(flags >> 8);
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if (parser == NULL)
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return 0;
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again:
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memset(tokens, 0, sizeof(tokens[0]) * ntokens);
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config_free_data(parser);
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/* Read one line (handling continuations with backslash) */
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line = bb_get_chunk_with_continuation(parser->fp, &len, &parser->lineno);
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if (line == NULL)
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return 0;
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parser->line = line;
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/* Strip trailing line-feed if any */
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if (len && line[len-1] == '\n')
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line[len-1] = '\0';
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/* Skip token in the start of line? */
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if (flags & PARSE_TRIM)
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line += strspn(line, delims + 1);
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if (line[0] == '\0' || line[0] == delims[0])
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goto again;
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if (flags & PARSE_KEEP_COPY)
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parser->data = xstrdup(line);
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/* Tokenize the line */
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t = 0;
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do {
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/* Pin token */
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tokens[t] = line;
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/* Combine remaining arguments? */
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if ((t != (ntokens-1)) || !(flags & PARSE_GREEDY)) {
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/* Vanilla token, find next delimiter */
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line += strcspn(line, delims[0] ? delims : delims + 1);
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} else {
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/* Combining, find comment char if any */
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line = strchrnul(line, delims[0]);
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/* Trim any extra delimiters from the end */
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if (flags & PARSE_TRIM) {
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while (strchr(delims + 1, line[-1]) != NULL)
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line--;
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}
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}
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/* Token not terminated? */
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if (*line == delims[0])
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*line = '\0';
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else if (*line != '\0')
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*line++ = '\0';
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#if 0 /* unused so far */
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if (flags & PARSE_ESCAPE) {
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strcpy_and_process_escape_sequences(tokens[t], tokens[t]);
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}
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#endif
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/* Skip possible delimiters */
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if (flags & PARSE_COLLAPSE)
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line += strspn(line, delims + 1);
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t++;
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} while (*line && *line != delims[0] && t < ntokens);
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if (t < mintokens) {
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bb_error_msg("bad line %u: %d tokens found, %d needed",
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parser->lineno, t, mintokens);
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if (flags & PARSE_MIN_DIE)
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xfunc_die();
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if (flags & PARSE_KEEP_COPY)
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free(parser->data);
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goto again;
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}
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return t;
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}
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