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authorBruno Haible <bruno@clisp.org>2011-02-06 14:02:26 +0100
committerBruno Haible <bruno@clisp.org>2011-02-07 23:36:06 +0100
commitf966b70bca56f1925c529598012eabb7d9fec5bf (patch)
tree4db1ac9c552b210041300b348d657ed911a16198 /lib/wcsrchr-impl.h
parent214aca197fc1b600e119e0fbae8cf196b48c5276 (diff)
downloadgnulib-f966b70bca56f1925c529598012eabb7d9fec5bf.tar.gz
New module 'wcsrchr'.
* modules/wcsrchr: New file. * lib/wchar.in.h (wcsrchr): New declaration. * lib/wcsrchr.c: New file. * lib/wcsrchr-impl.h: New file, from libutf8 with modifications. * m4/wcsrchr.m4: New file. * m4/wchar_h.m4 (gl_WCHAR_H): Test whether wcsrchr is declared. (gl_WCHAR_H_DEFAULTS): Initialize GNULIB_WCSRCHR, HAVE_WCSRCHR. * modules/wchar (Makefile.am): Substitute GNULIB_WCSRCHR, HAVE_WCSRCHR. * tests/test-wchar-c++.cc: Test the declaration of wcsrchr. * doc/posix-functions/wcsrchr.texi: Mention the new module.
Diffstat (limited to 'lib/wcsrchr-impl.h')
-rw-r--r--lib/wcsrchr-impl.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/lib/wcsrchr-impl.h b/lib/wcsrchr-impl.h
new file mode 100644
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+++ b/lib/wcsrchr-impl.h
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+/* Search wide string for a wide character.
+ Copyright (C) 1999, 2011 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 1999.
+
+ 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/>. */
+
+wchar_t *
+wcsrchr (const wchar_t *wcs, wchar_t wc)
+{
+ /* Calling wcslen and then searching from the other end would cause more
+ memory accesses. Avoid that, at the cost of a few more comparisons. */
+ wchar_t *result = NULL;
+
+ for (;; wcs++)
+ {
+ if (*wcs == wc)
+ result = (wchar_t *) wcs;
+ if (*wcs == (wchar_t)'\0')
+ break;
+ }
+ return result;
+}