151 lines
3.1 KiB
C
151 lines
3.1 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 tarball for details.
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*/
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#include "libbb.h"
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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; // parser structure
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// open file
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if (config_open(filename, &p)) {
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// parse line-by-line
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while (*config_read(&p, t, 3, 0, delimiters, comment_char) >= 0) { // 0..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_open(const char *filename)
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{
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parser_t *parser = xzalloc(sizeof(parser_t));
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/* empty file configures nothing */
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parser->fp = fopen_or_warn(filename, "r");
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if (parser->fp)
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return parser;
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config_close (parser);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(parser);
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return NULL;
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}
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static void config_free_data(parser_t *const parser)
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{
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free(parser->line);
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free(parser->data);
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parser->line = parser->data = NULL;
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}
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void FAST_FUNC config_close(parser_t *parser)
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{
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config_free_data(parser);
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fclose(parser->fp);
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}
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int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment)
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{
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char *line, *q;
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int ii, seen;
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/* do not treat consecutive delimiters as one delimiter */
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bool noreduce = (ntokens < 0);
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if (noreduce)
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ntokens = -ntokens;
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memset(tokens, 0, sizeof(tokens[0]) * ntokens);
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config_free_data(parser);
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while (1) {
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//TODO: speed up xmalloc_fgetline by internally using fgets, not fgetc
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line = xmalloc_fgetline(parser->fp);
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if (!line)
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return -1;
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parser->lineno++;
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// handle continuations. Tito's code stolen :)
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while (1) {
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ii = strlen(line);
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if (!ii)
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goto next_line;
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if (line[ii - 1] != '\\')
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break;
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// multi-line object
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line[--ii] = '\0';
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//TODO: add xmalloc_fgetline-like iface but with appending to existing str
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q = xmalloc_fgetline(parser->fp);
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if (q) {
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parser->lineno++;
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line = xasprintf("%s%s", line, q);
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free(q);
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}
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}
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// comments mean EOLs
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if (comment) {
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q = strchrnul(line, comment);
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*q = '\0';
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ii = q - line;
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}
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// skip leading delimiters
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seen = strspn(line, delims);
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if (seen) {
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ii -= seen;
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strcpy(line, line + seen);
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}
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if (ii)
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break;
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next_line:
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/* skip empty line */
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free(line);
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}
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// non-empty line found, parse and return
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// store line
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parser->line = line = xrealloc(line, ii + 1);
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parser->data = xstrdup(line);
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/* now split line to tokens */
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ii = noreduce ? seen : 0;
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ntokens--; // now it's max allowed token no
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while (1) {
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// get next token
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if (ii == ntokens)
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break;
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q = line + strcspn(line, delims);
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if (!*q)
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break;
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// pin token
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*q++ = '\0';
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if (noreduce || *line) {
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tokens[ii++] = line;
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//bb_info_msg("L[%d] T[%s]\n", ii, line);
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}
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line = q;
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}
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// non-empty remainder is also a token,
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// so if ntokens <= 1, we just return the whole line
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if (noreduce || *line)
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tokens[ii++] = line;
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if (ii < mintokens)
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bb_error_msg_and_die("bad line %u: %d tokens found, %d needed",
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parser->lineno, ii, mintokens);
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return ii;
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}
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