lib/unistr/u32-strcspn.c

   1 /* Search for some characters in UTF-32 string.
   2    Copyright (C) 1999, 2002, 2006, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unistr.h"
  22
  23 #define FUNC u32_strcspn
  24 #define UNIT uint32_t
  25 #define U_STRLEN u32_strlen
  26 #define U_STRCHR u32_strchr
  27
  28 size_t
  29 FUNC (const UNIT *str, const UNIT *reject)
  30 {
  31   /* Optimize two cases.  */
  32   if (reject[0] == 0)
  33     return U_STRLEN (str);
  34   if (reject[1] == 0)
  35     {
  36       ucs4_t uc = reject[0];
  37       const UNIT *ptr = str;
  38       for (; *ptr != 0; ptr++)
  39         if (*ptr == uc)
  40           break;
  41       return ptr - str;
  42     }
  43   /* General case.  */
  44   {
  45     const UNIT *ptr = str;
  46     for (; *ptr != 0; ptr++)
  47       if (U_STRCHR (reject, *ptr))
  48         break;
  49     return ptr - str;
  50   }
  51 }