move ini parser into common

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

2 files changed, 146 insertions, 0 deletions

diff --git a/src/common/ini.c b/src/common/ini.c
new file mode 100644
index 00000000..fed0b187
--- /dev/null
+++ b/src/common/ini.c
@@ -0,0 +1,116 @@
+/*
+ *  ini.c
+ *
+ *  Copyright (c) 2013-2015 Pacman Development Team <pacman-dev@archlinux.org>
+ *
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <string.h> /* strdup */
+
+#include <alpm.h>
+
+#include "ini.h"
+#include "util.h"
+
+/**
+ * @brief Parse a pacman-style INI config file.
+ *
+ * @param file path to the config file
+ * @param cb callback for key/value pairs
+ * @param data caller defined data to be passed to the callback
+ *
+ * @return the callback return value
+ *
+ * @note The callback will be called at the beginning of each section with an
+ * empty key and value and for each key/value pair.
+ *
+ * @note If the parser encounters an error the callback will be called with
+ * section, key, and value set to NULL and errno set by fopen, fgets, or
+ * strdup.
+ *
+ * @note The @a key and @a value passed to @ cb will be overwritten between
+ * calls.  The section name will remain valid until after @a cb is called to
+ * begin a new section.
+ *
+ * @note Parsing will immediately stop if the callback returns non-zero.
+ */
+int parse_ini(const char *file, ini_parser_fn cb, void *data)
+{
+	char line[PATH_MAX], *section_name = NULL;
+	FILE *fp = NULL;
+	int linenum = 0;
+	int ret = 0;
+
+	fp = fopen(file, "r");
+	if(fp == NULL) {
+		return cb(file, 0, NULL, NULL, NULL, data);
+	}
+
+	while(safe_fgets(line, PATH_MAX, fp)) {
+		char *key, *value, *ptr;
+		size_t line_len;
+
+		linenum++;
+
+		/* ignore whole line and end of line comments */
+		if((ptr = strchr(line, '#'))) {
+			*ptr = '\0';
+		}
+
+		line_len = strtrim(line);
+
+		if(line_len == 0) {
+			continue;
+		}
+
+		if(line[0] == '[' && line[line_len - 1] == ']') {
+			char *name;
+			/* new config section, skip the '[' */
+			name = strdup(line + 1);
+			name[line_len - 2] = '\0';
+
+			ret = cb(file, linenum, name, NULL, NULL, data);
+			free(section_name);
+			section_name = name;
+
+			/* we're at a new section; perform any post-actions for the prior */
+			if(ret) {
+				goto cleanup;
+			}
+			continue;
+		}
+
+		/* directive */
+		/* strsep modifies the 'line' string: 'key \0 value' */
+		key = line;
+		value = line;
+		strsep(&value, "=");
+		strtrim(key);
+		strtrim(value);
+
+		if((ret = cb(file, linenum, section_name, key, value, data)) != 0) {
+			goto cleanup;
+		}
+	}
+
+cleanup:
+	fclose(fp);
+	free(section_name);
+	return ret;
+}
+
+/* vim: set noet: */
diff --git a/src/common/ini.h b/src/common/ini.h
new file mode 100644
index 00000000..e85a505d
--- /dev/null
+++ b/src/common/ini.h
@@ -0,0 +1,30 @@
+/*
+ *  ini.h
+ *
+ *  Copyright (c) 2013-2015 Pacman Development Team <pacman-dev@archlinux.org>
+ *
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _PM_INI_H
+#define _PM_INI_H
+
+typedef int (ini_parser_fn)(const char *file, int line, const char *section,
+		char *key, char *value, void *data);
+
+int parse_ini(const char *file, ini_parser_fn cb, void *data);
+
+#endif /* _PM_CONF_H */
+
+/* vim: set noet: */