core: add generic parser utility

This generic parser will get used for parsing the netgroups and exports
files for the Gluster/NFS server. The parsing of netgroups shows how the
parser can be used (see Change-Id Ie04800d4).

BUG: 1143880
Change-Id: Id4cf2b0189ef5799c06868d211d3fcd9c8608c08
Original-author: Shreyas Siravara <shreyas.siravara@gmail.com>
CC: Richard Wareing <rwareing@fb.com>
CC: Jiffin Tony Thottan <jthottan@redhat.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/9359
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/libglusterfs/src/parse-utils.h b/libglusterfs/src/parse-utils.h
new file mode 100644
index 00000000000..275ccf3153b
--- /dev/null
+++ b/libglusterfs/src/parse-utils.h
@@ -0,0 +1,50 @@
+/*
+   Copyright 2014-present Facebook. All Rights Reserved
+
+   This file is part of GlusterFS.
+
+   Author :
+   Shreyas Siravara <shreyas.siravara@gmail.com>
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _PARSE_UTILS_H
+#define _PARSE_UTILS_H
+
+#include <regex.h>
+
+#define GF_PARSE "parse-utils"
+
+struct parser {
+        regex_t preg;           /* Compiled regex */
+        regmatch_t pmatch[1];   /* The match */
+        char *complete_str;     /* The string we are parsing */
+        char *regex;            /* Regex used to parse the string */
+        char *_rstr;            /* Temp string to hold offsets */
+};
+
+/* Initializes some of the parsers variables */
+struct parser *
+parser_init (const char *regex);
+
+/* Sets the string to parse */
+int
+parser_set_string (struct parser *parser, const char *complete_str);
+
+/* Frees memory used by the string after all matches are found */
+int
+parser_unset_string (struct parser *parser);
+
+/* Free memory used by the parser */
+void
+parser_deinit (struct parser *ptr);
+
+/* Get the next matching string */
+char *
+parser_get_next_match (struct parser *parser);
+
+#endif /* _PARSE_UTILS_H */