1 /* vi: set sw=4 ts=4: */
3 * config file parser helper
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 int parse_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
14 int parse_main(int argc UNUSED_PARAM, char **argv)
16 const char *delims = "# \t";
17 unsigned flags = PARSE_NORMAL;
18 int mintokens = 0, ntokens = 128;
20 opt_complementary = "-1:n+:m+:f+";
21 getopt32(argv, "n:m:d:f:", &ntokens, &mintokens, &delims, &flags);
25 parser_t *p = config_open(*argv);
28 char **t = xmalloc(sizeof(char *) * ntokens);
29 while ((n = config_read(p, t, ntokens, mintokens, delims, flags)) != 0) {
30 for (int i = 0; i < n; ++i)
47 char *t[3]; // tokens placeholder
48 parser_t *p = config_open(filename);
51 while (config_read(p, t, 3, 0, delimiters, flags)) { // 1..3 tokens
53 bb_error_msg("TOKENS: [%s][%s][%s]", t[0], t[1], t[2]);
63 parser_t* FAST_FUNC config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path))
68 fp = fopen_func(filename);
71 parser = xzalloc(sizeof(*parser));
76 parser_t* FAST_FUNC config_open(const char *filename)
78 return config_open2(filename, fopen_or_warn_stdin);
81 static void config_free_data(parser_t *const parser)
85 if (PARSE_KEEP_COPY) { /* compile-time constant */
91 void FAST_FUNC config_close(parser_t *parser)
94 config_free_data(parser);
101 0. If parser is NULL return 0.
102 1. Read a line from config file. If nothing to read then return 0.
103 Handle continuation character. Advance lineno for each physical line.
104 Discard everything past comment characher.
105 2. if PARSE_TRIM is set (default), remove leading and trailing delimiters.
106 3. If resulting line is empty goto 1.
107 4. Look for first delimiter. If !PARSE_COLLAPSE or !PARSE_TRIM is set then
108 remember the token as empty.
109 5. Else (default) if number of seen tokens is equal to max number of tokens
110 (token is the last one) and PARSE_GREEDY is set then the remainder
111 of the line is the last token.
112 Else (token is not last or PARSE_GREEDY is not set) just replace
113 first delimiter with '\0' thus delimiting the token.
114 6. Advance line pointer past the end of token. If number of seen tokens
115 is less than required number of tokens then goto 4.
116 7. Check the number of seen tokens is not less the min number of tokens.
117 Complain or die otherwise depending on PARSE_MIN_DIE.
118 8. Return the number of seen tokens.
120 mintokens > 0 make config_read() print error message if less than mintokens
121 (but more than 0) are found. Empty lines are always skipped (not warned about).
124 int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims)
127 int ntokens, mintokens;
130 ntokens = flags & 0xFF;
131 mintokens = (flags & 0xFF00) >> 8;
137 memset(tokens, 0, sizeof(tokens[0]) * ntokens);
138 config_free_data(parser);
140 /* Read one line (handling continuations with backslash) */
141 line = bb_get_chunk_with_continuation(parser->fp, &len, &parser->lineno);
146 /* Strip trailing line-feed if any */
147 if (len && line[len-1] == '\n')
150 /* Skip token in the start of line? */
151 if (flags & PARSE_TRIM)
152 line += strspn(line, delims + 1);
154 if (line[0] == '\0' || line[0] == delims[0])
157 if (flags & PARSE_KEEP_COPY)
158 parser->data = xstrdup(line);
160 /* Tokenize the line */
161 for (t = 0; *line && *line != delims[0] && t < ntokens; t++) {
165 /* Combine remaining arguments? */
166 if ((t != (ntokens-1)) || !(flags & PARSE_GREEDY)) {
167 /* Vanilla token, find next delimiter */
168 line += strcspn(line, delims[0] ? delims : delims + 1);
170 /* Combining, find comment char if any */
171 line = strchrnul(line, delims[0]);
173 /* Trim any extra delimiters from the end */
174 if (flags & PARSE_TRIM) {
175 while (strchr(delims + 1, line[-1]) != NULL)
180 /* Token not terminated? */
181 if (line[0] == delims[0])
183 else if (line[0] != '\0')
186 #if 0 /* unused so far */
187 if (flags & PARSE_ESCAPE) {
191 from = to = tokens[t];
195 *to++ = bb_process_escape_sequence(&from);
204 /* Skip possible delimiters */
205 if (flags & PARSE_COLLAPSE)
206 line += strspn(line, delims + 1);
210 bb_error_msg("bad line %u: %d tokens found, %d needed",
211 parser->lineno, t, mintokens);
212 if (flags & PARSE_MIN_DIE)