Rework config parsing to reduce variable duplication

This removes the need to strdup() the section name at every decent into
an Include statement, as well as having duplicate DB pointers around
that are never used independently.

Signed-off-by: Dan McGee <dan@archlinux.org>

src/pacman/conf.c

@@ -369,7 +369,6 @@ static int _parse_options(const char *key, char *value,
 				return 1;
 			}
 		} else {
-
 			pm_printf(PM_LOG_WARNING,
 					_("config file %s, line %d: directive '%s' in section '%s' not recognized.\n"),
 					file, linenum, key, "options");
@@ -486,13 +485,12 @@ static int setlibpaths(void)
 /* The real parseconfig. Called with a null section argument by the publicly
  * visible parseconfig so we can recall from within ourself on an include */
 static int _parseconfig(const char *file, int parse_options,
-		const char *givensection, pmdb_t * const givendb)
+		char **section, pmdb_t *db)
 {
 	FILE *fp = NULL;
 	char line[PATH_MAX+1];
 	int linenum = 0;
-	char *ptr, *section = NULL;
+	char *ptr;
-	pmdb_t *db = NULL;
 	int ret = 0;
 
 	pm_printf(PM_LOG_DEBUG, "config: attempting to read file %s\n", file);
@@ -502,15 +500,6 @@ static int _parseconfig(const char *file, int parse_options,
 		return 1;
 	}
 
-	/* if we are passed a section, use it as our starting point */
-	if(givensection != NULL) {
-		section = strdup(givensection);
-	}
-	/* if we are passed a db, use it as our starting point */
-	if(givendb != NULL) {
-		db = givendb;
-	}
-
 	while(fgets(line, PATH_MAX, fp)) {
 		char *key, *value;
 
@@ -534,31 +523,33 @@ static int _parseconfig(const char *file, int parse_options,
 		}
 
 		if(line[0] == '[' && line[strlen(line)-1] == ']') {
+			char *name;
 			/* new config section, skip the '[' */
 			ptr = line;
 			ptr++;
-			if(section) {
+			name = strdup(ptr);
-				free(section);
+			name[strlen(name)-1] = '\0';
-			}
+			if(!strlen(name)) {
-			section = strdup(ptr);
-			section[strlen(section)-1] = '\0';
-			pm_printf(PM_LOG_DEBUG, "config: new section '%s'\n", section);
-			if(!strlen(section)) {
 				pm_printf(PM_LOG_ERROR, _("config file %s, line %d: bad section name.\n"),
 						file, linenum);
 				ret = 1;
 				goto cleanup;
 			}
+			pm_printf(PM_LOG_DEBUG, "config: new section '%s'\n", name);
 			/* if we are not looking at the options section, register a db */
-			if(!parse_options && strcmp(section, "options") != 0) {
+			if(!parse_options && strcmp(name, "options") != 0) {
-				db = alpm_db_register_sync(section);
+				db = alpm_db_register_sync(name);
 				if(db == NULL) {
 					pm_printf(PM_LOG_ERROR, _("could not register '%s' database (%s)\n"),
-							section, alpm_strerrorlast());
+							name, alpm_strerrorlast());
 					ret = 1;
 					goto cleanup;
 				}
 			}
+			if(*section) {
+				free(*section);
+			}
+			*section = name;
 			continue;
 		}
 
@@ -577,7 +568,7 @@ static int _parseconfig(const char *file, int parse_options,
 			goto cleanup;
 		}
 		/* For each directive, compare to the camelcase string. */
-		if(section == NULL) {
+		if(*section == NULL) {
 			pm_printf(PM_LOG_ERROR, _("config file %s, line %d: All directives must belong to a section.\n"),
 					file, linenum);
 			ret = 1;
@@ -624,12 +615,12 @@ static int _parseconfig(const char *file, int parse_options,
 			globfree(&globbuf);
 			continue;
 		}
-		if(parse_options && strcmp(section, "options") == 0) {
+		if(parse_options && strcmp(*section, "options") == 0) {
 			/* we are either in options ... */
 			if((ret = _parse_options(key, value, file, linenum)) != 0) {
 				goto cleanup;
 			}
-		} else if (!parse_options && strcmp(section, "options") != 0) {
+		} else if (!parse_options && strcmp(*section, "options") != 0) {
 			/* ... or in a repo section */
 			if(strcmp(key, "Server") == 0) {
 				if(value == NULL) {
@@ -661,16 +652,13 @@ static int _parseconfig(const char *file, int parse_options,
 			} else {
 				pm_printf(PM_LOG_WARNING,
 						_("config file %s, line %d: directive '%s' in section '%s' not recognized.\n"),
-						file, linenum, key, section);
+						file, linenum, key, *section);
 			}
 		}
 	}
 
 cleanup:
 	fclose(fp);
-	if(section){
-		free(section);
-	}
 	pm_printf(PM_LOG_DEBUG, "config: finished parsing %s\n", file);
 	return ret;
 }
@@ -682,22 +670,27 @@ cleanup:
 int parseconfig(const char *file)
 {
 	int ret;
+	char *section = NULL;
 	/* the config parse is a two-pass affair. We first parse the entire thing for
 	 * the [options] section so we can get all default and path options set.
 	 * Next, we go back and parse everything but [options]. */
 
 	/* call the real parseconfig function with a null section & db argument */
 	pm_printf(PM_LOG_DEBUG, "parseconfig: options pass\n");
-	if((ret = _parseconfig(file, 1, NULL, NULL))) {
+	if((ret = _parseconfig(file, 1, &section, NULL))) {
+		free(section);
 		return ret;
 	}
+	free(section);
 	/* call setlibpaths here to ensure we have called it at least once */
 	if((ret = setlibpaths())) {
 		return ret;
 	}
 	/* second pass, repo section parsing */
+	section = NULL;
 	pm_printf(PM_LOG_DEBUG, "parseconfig: repo pass\n");
-	return _parseconfig(file, 0, NULL, NULL);
+	return _parseconfig(file, 0, &section, NULL);
+	free(section);
 }
 
 /* vim: set ts=2 sw=2 noet: */