* 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 ENABLE_PARSE
+#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 = 0;
+ 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;
parser_t* FAST_FUNC config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path))
{
- parser_t *parser = xzalloc(sizeof(parser_t));
- /* empty file configures nothing */
- parser->fp = fopen_func(filename);
- if (parser->fp)
- return parser;
- free(parser);
- return NULL;
+ 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)
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);
+ }
}
/*
-1. Read a line from config file. If nothing to read then bail out returning 0.
- Handle continuation character. Advance lineno for each physical line. Cut comments.
-2. if PARSE_DONT_TRIM is not set (default) skip leading and cut trailing delimiters, if any.
+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 characher.
+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_DONT_REDUCE or PARSE_DONT_TRIM is set then pin empty token.
-5. Else (default) if number of seen tokens is equal to max number of tokens (token is the last one)
- and PARSE_LAST_IS_GREEDY is set then pin the remainder of the line as the last token.
- Else (token is not last or PARSE_LAST_IS_GREEDY is not set) just replace first delimiter with '\0'
- thus delimiting token and pin it.
-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. Control the number of seen tokens is not less the min number of tokens. Die if condition is not met.
+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() exit with error message if less than mintokens
+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;
- char comment = *delims++;
- int ii;
- int ntokens = flags & 0xFF;
- int mintokens = (flags & 0xFF00) >> 8;
-
- again:
- // N.B. this could only be used in read-in-one-go version, or when tokens use xstrdup(). TODO
- //if (!parser->lineno || !(flags & PARSE_DONT_NULL))
- memset(tokens, 0, sizeof(tokens[0]) * 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 0;
-
- 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);
- }
- }
- // comments mean EOLs
- if (comment) {
- q = strchrnul(line, comment);
- *q = '\0';
- ii = q - line;
- }
- // skip leading and trailing delimiters
- if (!(flags & PARSE_DONT_TRIM)) {
- // skip leading
- int n = strspn(line, delims);
- if (n) {
- ii -= n;
- overlapping_strcpy(line, line + n);
- }
- // cut trailing
- if (ii) {
- while (strchr(delims, line[--ii]))
- continue;
- line[++ii] = '\0';
- }
- }
- // if something still remains -> return it
- if (ii)
- break;
+ /* 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;
- next_line:
- // skip empty line
- free(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);
- // non-empty line found, parse and return the number of tokens
+ if (line[0] == '\0' || line[0] == delims[0])
+ goto again;
- // store line
- parser->line = line = xrealloc(line, ii + 1);
- if (flags & PARSE_KEEP_COPY) {
+ if (flags & PARSE_KEEP_COPY)
parser->data = xstrdup(line);
- }
- // split line to tokens
- ntokens--; // now it's max allowed token no
- // N.B. non-empty remainder is also a token,
- // so if ntokens <= 1, we just return the whole line
- // N.B. if PARSE_LAST_IS_GREEDY is set the remainder of the line is stuck to the last token
- for (ii = 0; *line && ii <= ntokens; ) {
- //bb_info_msg("L[%s]", line);
- // get next token
- // at the last token and need greedy token ->
- if ((flags & PARSE_LAST_IS_GREEDY) && (ii == ntokens)) {
- // skip possible delimiters
- if (!(flags & PARSE_DONT_REDUCE))
- line += strspn(line, delims);
- // don't cut the line
- q = line + strlen(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 {
- // vanilla token. cut the line at the first delim
- q = line + strcspn(line, delims);
- if (*q) // watch out: do not step past the line end!
- *q++ = '\0';
+ /* 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--;
+ }
}
- // pin token
- if ((flags & (PARSE_DONT_REDUCE|PARSE_DONT_TRIM)) || *line) {
- //bb_info_msg("N[%d] T[%s]", ii, line);
- tokens[ii++] = line;
- // process escapes in token
- if (flags & PARSE_ESCAPE) {
- char *s = line;
- while (*s) {
- if (*s == '\\') {
- s++;
- *line++ = bb_process_escape_sequence((const char **)&s);
- } else {
- *line++ = *s++;
- }
+
+ /* 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++;
}
- *line = '\0';
}
+ *to = '\0';
}
- line = q;
- //bb_info_msg("A[%s]", line);
+#endif
+
+ /* Skip possible delimiters */
+ if (flags & PARSE_COLLAPSE)
+ line += strspn(line, delims + 1);
}
- if (ii < mintokens) {
+ if (t < mintokens) {
bb_error_msg("bad line %u: %d tokens found, %d needed",
- parser->lineno, ii, mintokens);
+ parser->lineno, t, mintokens);
if (flags & PARSE_MIN_DIE)
xfunc_die();
goto again;
}
- return ii;
+ return t;
}
projects / oweals / busybox.git / blobdiff