Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 61 insertions, 0 deletions

diff --git a/REORG.TODO/stdlib/rpmatch.c b/REORG.TODO/stdlib/rpmatch.c
new file mode 100644
index 0000000000..965c2999d8
--- /dev/null
+++ b/REORG.TODO/stdlib/rpmatch.c
@@ -0,0 +1,61 @@
+/* Determine whether string value is affirmation or negative response
+   according to current locale's data.
+   This file is part of the GNU C Library.
+   Copyright (C) 1996-2017 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <langinfo.h>
+#include <stdlib.h>
+#include <regex.h>
+
+
+/* Match against one of the response patterns, compiling the pattern
+   first if necessary.  */
+static int
+try (const char *response,
+     const int tag, const int match, const int nomatch,
+     const char **lastp, regex_t *re)
+{
+  const char *pattern = nl_langinfo (tag);
+  if (pattern != *lastp)
+    {
+      /* The pattern has changed.  */
+      if (*lastp != NULL)
+        {
+          /* 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 (const char *response)
+{
+  /* We cache the response patterns and compiled regexps here.  */
+  static const char *yesexpr, *noexpr;
+  static regex_t yesre, nore;
+
+  return (try (response, YESEXPR, 1, 0, &yesexpr, &yesre) ?:
+	  try (response, NOEXPR, 0, -1, &noexpr, &nore));
+}