* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Also for use in uClibc (http://uclibc.org/) licensed under LGPLv2.1 or later.
*/
#include "libbb.h"
+#if defined ENABLE_PARSE && ENABLE_PARSE
+int parse_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int parse_main(int argc UNUSED_PARAM, char **argv)
+{
+ const char *delims = "# \t";
+ unsigned flags = PARSE_NORMAL;
+ int mintokens = 0, ntokens = 128;
+
+ opt_complementary = "-1:n+:m+:f+";
+ getopt32(argv, "n:m:d:f:", &ntokens, &mintokens, &delims, &flags);
+ //argc -= optind;
+ argv += optind;
+ while (*argv) {
+ parser_t *p = config_open(*argv);
+ if (p) {
+ int n;
+ char **t = xmalloc(sizeof(char *) * ntokens);
+ while ((n = config_read(p, t, ntokens, mintokens, delims, flags)) != 0) {
+ for (int i = 0; i < n; ++i)
+ printf("[%s]", t[i]);
+ puts("");
+ }
+ config_close(p);
+ }
+ argv++;
+ }
+ return EXIT_SUCCESS;
+}
+#endif
+
/*
Typical usage:
----- CUT -----
char *t[3]; // tokens placeholder
- parser_t p; // parser structure
- // open file
- if (config_open(filename, &p)) {
+ parser_t *p = config_open(filename);
+ if (p) {
// parse line-by-line
- while (*config_read(&p, t, 3, 0, delimiters, comment_char) >= 0) { // 0..3 tokens
+ while (config_read(p, t, 3, 0, delimiters, flags)) { // 1..3 tokens
// use tokens
bb_error_msg("TOKENS: [%s][%s][%s]", t[0], t[1], t[2]);
}
...
// free parser
- config_close(&p);
+ config_close(p);
}
----- CUT -----
*/
+parser_t* FAST_FUNC config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path))
+{
+ FILE* fp;
+ parser_t *parser;
+
+ fp = fopen_func(filename);
+ if (!fp)
+ return NULL;
+ parser = xzalloc(sizeof(*parser));
+ parser->fp = fp;
+ return parser;
+}
+
parser_t* FAST_FUNC config_open(const char *filename)
{
- parser_t *parser = xzalloc(sizeof(parser_t));
- /* empty file configures nothing */
- parser->fp = fopen_or_warn(filename, "r");
- if (parser->fp)
- return parser;
- config_close (parser);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(parser);
- return NULL;
+ return config_open2(filename, fopen_or_warn_stdin);
}
-static void config_free_data(parser_t *const parser)
+static void config_free_data(parser_t *parser)
{
free(parser->line);
- free(parser->data);
- parser->line = parser->data = NULL;
+ parser->line = NULL;
+ if (PARSE_KEEP_COPY) { /* compile-time constant */
+ free(parser->data);
+ parser->data = NULL;
+ }
}
+
void FAST_FUNC config_close(parser_t *parser)
{
- config_free_data(parser);
- fclose(parser->fp);
+ if (parser) {
+ config_free_data(parser);
+ fclose(parser->fp);
+ free(parser);
+ }
}
-int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment)
+/*
+0. If parser is NULL return 0.
+1. Read a line from config file. If nothing to read then return 0.
+ Handle continuation character. Advance lineno for each physical line.
+ Discard everything past comment character.
+2. if PARSE_TRIM is set (default), remove leading and trailing delimiters.
+3. If resulting line is empty goto 1.
+4. Look for first delimiter. If !PARSE_COLLAPSE or !PARSE_TRIM is set then
+ remember the token as empty.
+5. Else (default) if number of seen tokens is equal to max number of tokens
+ (token is the last one) and PARSE_GREEDY is set then the remainder
+ of the line is the last token.
+ Else (token is not last or PARSE_GREEDY is not set) just replace
+ first delimiter with '\0' thus delimiting the token.
+6. Advance line pointer past the end of token. If number of seen tokens
+ is less than required number of tokens then goto 4.
+7. Check the number of seen tokens is not less the min number of tokens.
+ Complain or die otherwise depending on PARSE_MIN_DIE.
+8. Return the number of seen tokens.
+
+mintokens > 0 make config_read() print error message if less than mintokens
+(but more than 0) are found. Empty lines are always skipped (not warned about).
+*/
+#undef config_read
+int FAST_FUNC config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims)
{
- char *line, *q;
- int ii, seen;
- /* do not treat consecutive delimiters as one delimiter */
- bool noreduce = (ntokens < 0);
- if (noreduce)
- ntokens = -ntokens;
+ char *line;
+ int ntokens, mintokens;
+ int t, len;
+ ntokens = flags & 0xFF;
+ mintokens = (flags & 0xFF00) >> 8;
+
+ if (parser == NULL)
+ return 0;
+
+again:
memset(tokens, 0, sizeof(tokens[0]) * ntokens);
config_free_data(parser);
- while (1) {
-//TODO: speed up xmalloc_fgetline by internally using fgets, not fgetc
- line = xmalloc_fgetline(parser->fp);
- if (!line)
- return -1;
-
- parser->lineno++;
- // handle continuations. Tito's code stolen :)
- while (1) {
- ii = strlen(line);
- if (!ii)
- goto next_line;
- if (line[ii - 1] != '\\')
- break;
- // multi-line object
- line[--ii] = '\0';
-//TODO: add xmalloc_fgetline-like iface but with appending to existing str
- q = xmalloc_fgetline(parser->fp);
- if (q) {
- parser->lineno++;
- line = xasprintf("%s%s", line, q);
- free(q);
+ /* Read one line (handling continuations with backslash) */
+ line = bb_get_chunk_with_continuation(parser->fp, &len, &parser->lineno);
+ if (line == NULL)
+ return 0;
+ parser->line = line;
+
+ /* Strip trailing line-feed if any */
+ if (len && line[len-1] == '\n')
+ line[len-1] = '\0';
+
+ /* Skip token in the start of line? */
+ if (flags & PARSE_TRIM)
+ line += strspn(line, delims + 1);
+
+ if (line[0] == '\0' || line[0] == delims[0])
+ goto again;
+
+ if (flags & PARSE_KEEP_COPY)
+ parser->data = xstrdup(line);
+
+ /* Tokenize the line */
+ for (t = 0; *line && *line != delims[0] && t < ntokens; t++) {
+ /* Pin token */
+ tokens[t] = line;
+
+ /* Combine remaining arguments? */
+ if ((t != (ntokens-1)) || !(flags & PARSE_GREEDY)) {
+ /* Vanilla token, find next delimiter */
+ line += strcspn(line, delims[0] ? delims : delims + 1);
+ } else {
+ /* Combining, find comment char if any */
+ line = strchrnul(line, delims[0]);
+
+ /* Trim any extra delimiters from the end */
+ if (flags & PARSE_TRIM) {
+ while (strchr(delims + 1, line[-1]) != NULL)
+ line--;
}
}
- // comments mean EOLs
- if (comment) {
- q = strchrnul(line, comment);
- *q = '\0';
- ii = q - line;
- }
- // skip leading delimiters
- seen = strspn(line, delims);
- if (seen) {
- ii -= seen;
- strcpy(line, line + seen);
+
+ /* Token not terminated? */
+ if (line[0] == delims[0])
+ *line = '\0';
+ else if (line[0] != '\0')
+ *(line++) = '\0';
+
+#if 0 /* unused so far */
+ if (flags & PARSE_ESCAPE) {
+ const char *from;
+ char *to;
+
+ from = to = tokens[t];
+ while (*from) {
+ if (*from == '\\') {
+ from++;
+ *to++ = bb_process_escape_sequence(&from);
+ } else {
+ *to++ = *from++;
+ }
+ }
+ *to = '\0';
}
- if (ii)
- break;
+#endif
- next_line:
- /* skip empty line */
- free(line);
+ /* Skip possible delimiters */
+ if (flags & PARSE_COLLAPSE)
+ line += strspn(line, delims + 1);
}
- // non-empty line found, parse and return
-
- // store line
- parser->line = line = xrealloc(line, ii + 1);
- parser->data = xstrdup(line);
-
- /* now split line to tokens */
- ii = noreduce ? seen : 0;
- ntokens--; // now it's max allowed token no
- while (1) {
- // get next token
- if (ii == ntokens)
- break;
- q = line + strcspn(line, delims);
- if (!*q)
- break;
- // pin token
- *q++ = '\0';
- if (noreduce || *line) {
- tokens[ii++] = line;
-//bb_info_msg("L[%d] T[%s]\n", ii, line);
- }
- line = q;
+ if (t < mintokens) {
+ bb_error_msg("bad line %u: %d tokens found, %d needed",
+ parser->lineno, t, mintokens);
+ if (flags & PARSE_MIN_DIE)
+ xfunc_die();
+ goto again;
}
- // non-empty remainder is also a token,
- // so if ntokens <= 1, we just return the whole line
- if (noreduce || *line)
- tokens[ii++] = line;
-
- if (ii < mintokens)
- bb_error_msg_and_die("bad line %u: %d tokens found, %d needed",
- parser->lineno, ii, mintokens);
-
- return ii;
+ return t;
}
projects / oweals / busybox.git / blobdiff