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/* Search for some characters in UTF-8/UTF-16/UTF-32 string.
Copyright (C) 1999, 2002, 2006, 2009-2020 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 <https://www.gnu.org/licenses/>. */
UNIT *
FUNC (const UNIT *str, const UNIT *accept)
{
/* Optimize two cases. */
if (accept[0] == 0)
return NULL;
{
ucs4_t uc;
int count = U_STRMBTOUC (&uc, accept);
if (count >= 0 && accept[count] == 0)
return U_STRCHR (str, uc);
}
/* General case. */
{
const UNIT *ptr = str;
for (;;)
{
ucs4_t uc;
int count = U_STRMBTOUC (&uc, ptr);
if (count <= 0)
break;
if (U_STRCHR (accept, uc))
return (UNIT *) ptr;
ptr += count;
}
return NULL;
}
}
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