--- /dev/null
+/*
+ * configfile.c -- config file functions for browser-switchboard
+ *
+ * Copyright (C) 2009 Steven Luo
+ * Derived from a Python implementation by Jason Simpson and Steven Luo
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <regex.h>
+
+#include "configfile.h"
+
+#define MAXLINE 1024
+
+/* regex matching blank lines or comments */
+#define REGEX_IGNORE "^[[:space:]]*(#|$)"
+#define REGEX_IGNORE_FLAGS REG_EXTENDED|REG_NOSUB
+
+/* regex matching foo = "bar", with arbitrary whitespace at beginning and end
+ of line and surrounding the = */
+#define REGEX_CONFIG1 "^[[:space:]]*([^=[:space:]]+)[[:space:]]*=[[:space:]]*\"(.*)\"[[:space:]]*$"
+#define REGEX_CONFIG1_FLAGS REG_EXTENDED
+
+/* regex matching foo = bar, with arbitrary whitespace at beginning of line and
+ surrounding the = */
+#define REGEX_CONFIG2 "^[[:space:]]*([^=[:space:]]+)[[:space:]]*=[[:space:]]*(.*)$"
+#define REGEX_CONFIG2_FLAGS REG_EXTENDED|REG_NEWLINE
+
+static regex_t re_ignore, re_config1, re_config2;
+static int re_init = 0;
+
+/* Open config file for reading */
+FILE *open_config_file(void) {
+ char *homedir, *configfile;
+ size_t len;
+ FILE *fp;
+
+ /* Put together the path to the config file */
+ if (!(homedir = getenv("HOME")))
+ homedir = DEFAULT_HOMEDIR;
+ len = strlen(homedir) + strlen(CONFIGFILE_LOC) + 1;
+ if (!(configfile = calloc(len, sizeof(char))))
+ return NULL;
+ snprintf(configfile, len, "%s%s", homedir, CONFIGFILE_LOC);
+
+ /* Try to open the config file */
+ if (!(fp = fopen(configfile, "r"))) {
+ /* Try the legacy config file location before giving up
+ XXX we assume here that CONFIGFILE_LOC_OLD is shorter
+ than CONFIGFILE_LOC! */
+ snprintf(configfile, len, "%s%s", homedir, CONFIGFILE_LOC_OLD);
+ fp = fopen(configfile, "r");
+ }
+
+ free(configfile);
+ return fp;
+}
+
+/* Initialize the config file parser
+ Returns 1 if initialization successful, 0 otherwise */
+int parse_config_file_begin(void) {
+ /* Just return if parser's already been initialized */
+ if (re_init)
+ return 1;
+
+ /* compile regex matching blank lines or comments */
+ if (regcomp(&re_ignore, REGEX_IGNORE, REGEX_IGNORE_FLAGS))
+ return 0;
+ /* compile regex matching foo = "bar", with arbitrary whitespace at
+ beginning and end of line and surrounding the = */
+ if (regcomp(&re_config1, REGEX_CONFIG1, REGEX_CONFIG1_FLAGS)) {
+ regfree(&re_ignore);
+ return 0;
+ }
+ /* compile regex matching foo = bar, with arbitrary whitespace at
+ beginning of line and surrounding the = */
+ if (regcomp(&re_config2, REGEX_CONFIG2, REGEX_CONFIG2_FLAGS)) {
+ regfree(&re_ignore);
+ regfree(&re_config1);
+ return 0;
+ }
+
+ re_init = 1;
+ return 1;
+}
+
+/* End config file parsing and free the resources */
+void parse_config_file_end(void) {
+ /* Just return if parser's not active */
+ if (!re_init)
+ return;
+
+ regfree(&re_ignore);
+ regfree(&re_config1);
+ regfree(&re_config2);
+}
+
+/* Read the next line from a config file and store it into a swb_config_line,
+ parsing it into key and value if possible
+ Caller is responsible for freeing the strings in the swb_config_line if
+ call returns successfully
+ Returns 0 on success (whether line parsed or not), 1 on EOF, -1 on error */
+int parse_config_file_line(FILE *fp, struct swb_config_line *line) {
+ regmatch_t substrs[3];
+ size_t len;
+ char *tmp;
+
+ if (!re_init || !fp || !line)
+ return -1;
+
+ line->parsed = 0;
+ line->key = NULL;
+ line->value = NULL;
+
+ if (!(line->key = calloc(MAXLINE, sizeof(char))))
+ return -1;
+
+ /* Read in the next line of the config file
+ XXX doesn't deal with lines longer than MAXLINE */
+ if (!fgets(line->key, MAXLINE, fp)) {
+ free(line->key);
+ line->key = NULL;
+ if (feof(fp))
+ return 1;
+ else
+ return -1;
+ }
+
+ /* no need to parse blank lines and comments */
+ if (!regexec(&re_ignore, line->key, 0, NULL, 0))
+ goto finish;
+
+ /* Find the substrings corresponding to the key and value
+ If the line doesn't match our idea of a config file entry,
+ don't parse it */
+ if (regexec(&re_config1, line->key, 3, substrs, 0) &&
+ regexec(&re_config2, line->key, 3, substrs, 0))
+ goto finish;
+ if (substrs[1].rm_so == -1 || substrs[2].rm_so == -1)
+ goto finish;
+
+ /* copy the config value into a new string */
+ len = substrs[2].rm_eo - substrs[2].rm_so;
+ if (!(line->value = calloc(len+1, sizeof(char)))) {
+ free(line->key);
+ line->key = NULL;
+ return -1;
+ }
+ strncpy(line->value, line->key+substrs[2].rm_so, len);
+ /* calloc() zeroes the memory, so string is automatically
+ null terminated */
+
+ /* make key point to a null-terminated string holding the
+ config key */
+ len = substrs[1].rm_eo - substrs[1].rm_so;
+ memmove(line->key, line->key+substrs[1].rm_so, len);
+ line->key[len] = '\0';
+
+ /* done parsing the line */
+ line->parsed = 1;
+
+finish:
+ if (!line->parsed) {
+ /* Toss a trailing newline, if present */
+ len = strlen(line->key);
+ if (line->key[len-1] == '\n')
+ line->key[len-1] = '\0';
+ }
+ /* Try to shrink the allocation for key, to save space if someone
+ wants to keep it around */
+ len = strlen(line->key);
+ if ((tmp = realloc(line->key, len+1)))
+ line->key = tmp;
+ return 0;
+}
projects / browser-switch / blobdiff