lib/memchr2.h

   1 /* Scan memory for the first of two bytes.
   2    Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    This file is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* This file uses _GL_ATTRIBUTE_PURE.  */
  18 #if !_GL_CONFIG_H_INCLUDED
  19  #error "Please include config.h first."
  20 #endif
  21
  22 #include <stddef.h>
  23
  24 #ifdef __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 /* Return the first address of either C1 or C2 (treated as unsigned
  29    char) that occurs within N bytes of the memory region S.  If
  30    neither byte appears, return NULL.  */
  31
  32 extern void *memchr2 (void const *s, int c1, int c2, size_t n)
  33   _GL_ATTRIBUTE_PURE;
  34
  35 #ifdef __cplusplus
  36 }
  37 #endif