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authorJim Meyering <jim@meyering.net>1996-07-21 17:16:13 +0000
committerJim Meyering <jim@meyering.net>1996-07-21 17:16:13 +0000
commitbd6aa3080a93f9e2651cb2ba0b122f9a7c164d9b (patch)
tree20197c9c01b81c0f357634db2fc21dbd9294ca12 /lib
parent7f1cf81aba0d53acbd74c8b348ffc16abfee6e02 (diff)
downloadcoreutils-bd6aa3080a93f9e2651cb2ba0b122f9a7c164d9b.tar.xz
.
Diffstat (limited to 'lib')
-rw-r--r--lib/rpmatch.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/rpmatch.c b/lib/rpmatch.c
new file mode 100644
index 000000000..b3fd4a091
--- /dev/null
+++ b/lib/rpmatch.c
@@ -0,0 +1,70 @@
+/* rpmatch - determine whether string value is affirmation or negative
+ response according to current locale's data
+Copyright (C) 1996 Free Software Foundation, Inc.
+
+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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <regex.h>
+
+
+static int
+try (tag, match, nomatch, lastp, re)
+ const char *pattern;
+ const int match;
+ const int nomatch;
+ const char **lastp;
+ regex_t *re;
+{
+ if (pattern != *lastp)
+ {
+ /* The pattern has changed. */
+ if (*lastp)
+ {
+ /* Free the old compiled pattern. */
+ regfree (re);
+ *lastp = NULL;
+ }
+ /* Compile the pattern and cache it for future runs. */
+ if (regcomp (re, pattern, REG_EXTENDED) != 0)
+ return -1;
+ *lastp = pattern;
+ }
+
+ /* Try the pattern. */
+ return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch;
+}
+
+
+int
+rpmatch (response)
+ const char *response;
+{
+ /* Match against one of the response patterns, compiling the pattern
+ first if necessary. */
+
+ /* We cache the response patterns and compiled regexps here. */
+ static const char *yesexpr, *noexpr;
+ static regex_t yesre, nore;
+ int result;
+
+ return ((result = try (_("[yY][[:alpha:]]"), 1, 0, &yesexpr, &yesre))
+ ? result
+ : try (_("[nN][[:alpha:]]"), 0, -1, &noexpr, &nore));
+}