diff options
Diffstat (limited to 'lib/unistr/u-strspn.h')
-rw-r--r-- | lib/unistr/u-strspn.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/unistr/u-strspn.h b/lib/unistr/u-strspn.h new file mode 100644 index 00000000..6502ce4b --- /dev/null +++ b/lib/unistr/u-strspn.h @@ -0,0 +1,54 @@ +/* Search for some characters in UTF-8/UTF-16/UTF-32 string. + Copyright (C) 1999, 2002, 2006 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2002. + + This program 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 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +size_t +FUNC (const UNIT *str, const UNIT *accept) +{ + /* Optimize two cases. */ + if (accept[0] == 0) + return 0; + { + ucs4_t uc; + int count = U_STRMBTOUC (&uc, accept); + if (count >= 0 && accept[count] == 0) + { + const UNIT *ptr = str; + for (; *ptr != 0; ptr += count) + if (U_CMP (ptr, accept, count) != 0) + break; + return ptr - str; + } + } + /* General case. */ + { + const UNIT *ptr = str; + + for (;;) + { + ucs4_t uc; + int count = U_STRMBTOUC (&uc, ptr); + if (count == 0) + return ptr - str; + if (count < 0) + break; + if (!U_STRCHR (accept, uc)) + return ptr - str; + ptr += count; + } + return U_STRLEN (str); + } +} |