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author | Bruno Haible <bruno@clisp.org> | 2011-02-06 14:10:45 +0100 |
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committer | Bruno Haible <bruno@clisp.org> | 2011-02-07 23:36:07 +0100 |
commit | 1692395a63b2795a9d5c8e048e776f2e342fe2bb (patch) | |
tree | c7719084bf7bcc03914ac125a1ce3834700cb06b /lib/wcscspn-impl.h | |
parent | f966b70bca56f1925c529598012eabb7d9fec5bf (diff) | |
download | gnulib-1692395a63b2795a9d5c8e048e776f2e342fe2bb.tar.gz |
New module 'wcscspn'.
* modules/wcscspn: New file.
* lib/wchar.in.h (wcscspn): New declaration.
* lib/wcscspn.c: New file.
* lib/wcscspn-impl.h: New file, from libutf8 with modifications.
* m4/wcscspn.m4: New file.
* m4/wchar_h.m4 (gl_WCHAR_H): Test whether wcscspn is declared.
(gl_WCHAR_H_DEFAULTS): Initialize GNULIB_WCSCSPN, HAVE_WCSCSPN.
* modules/wchar (Makefile.am): Substitute GNULIB_WCSCSPN, HAVE_WCSCSPN.
* tests/test-wchar-c++.cc: Test the declaration of wcscspn.
* doc/posix-functions/wcscspn.texi: Mention the new module.
Diffstat (limited to 'lib/wcscspn-impl.h')
-rw-r--r-- | lib/wcscspn-impl.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/wcscspn-impl.h b/lib/wcscspn-impl.h new file mode 100644 index 0000000000..0c6452fbce --- /dev/null +++ b/lib/wcscspn-impl.h @@ -0,0 +1,47 @@ +/* Search a wide string for any of a set of wide characters. + 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/>. */ + +size_t +wcscspn (const wchar_t *wcs, const wchar_t *reject) +{ + /* Optimize two cases. */ + if (reject[0] == (wchar_t)'\0') + return wcslen (wcs); + + if (reject[1] == (wchar_t)'\0') + { + wchar_t wc = reject[0]; + const wchar_t *ptr = wcs; + for (; *ptr != (wchar_t)'\0'; ptr++) + { + if (*ptr == wc) + break; + } + return ptr - wcs; + } + + /* General case. */ + { + const wchar_t *ptr = wcs; + for (; *ptr != (wchar_t)'\0'; ptr++) + { + if (wcschr (reject, *ptr)) + break; + } + return ptr - wcs; + } +} |