New module 'regex-quote'.

* lib/regex-quote.h: New file.
* lib/regex-quote.c: New file.
* modules/regex-quote: New file.
Suggested by Reuben Thomas <rrt@sc3d.org>.

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/regex-quote.h b/lib/regex-quote.h
new file mode 100644
index 0000000000..203750acd1
--- /dev/null
+++ b/lib/regex-quote.h
@@ -0,0 +1,41 @@
+/* Construct a regular expression from a literal string.
+   Copyright (C) 1995, 2010 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2010.
+
+   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 3 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 <stddef.h>
+
+/* regex_quote converts a literal string to a regular expression that will
+   look for this literal string.
+   cflags can be 0 or REG_EXTENDED.
+   If it is 0, the result is a Basic Regular Expression (BRE)
+   <http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03>.
+   If it is REG_EXTENDED, the result is an Extended Regular Expression (ERE)
+   <http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04>.
+   The result is not anchored; if you want it to match only complete lines,
+   you need to add "^" at the beginning of the result and "$" at the end of the
+   result.
+ */
+
+/* Returns the number of bytes needed for the quoted string.  */
+extern size_t regex_quote_length (const char *string, int cflags);
+
+/* Copies the quoted string to p and returns the incremented p.
+   There must be room for regex_quote_length (string, cflags) + 1 bytes at p.
+ */
+extern char * regex_quote_copy (char *p, const char *string, int cflags);
+
+/* Returns the freshly allocated quoted string.  */
+extern char * regex_quote (const char *string, int cflags);