1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library 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 GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <string.h>
      19  #include <libc-diag.h>
      20  
      21  #ifndef RAWMEMCHR
      22  # define RAWMEMCHR __rawmemchr
      23  #endif
      24  
      25  /* The pragmata should be nested inside RAWMEMCHR below, but that
      26     triggers GCC PR 98512.  */
      27  DIAG_PUSH_NEEDS_COMMENT;
      28  #if __GNUC_PREREQ (7, 0)
      29  /* GCC 8 warns about the size passed to memchr being larger than
      30     PTRDIFF_MAX; the use of SIZE_MAX is deliberate here.  */
      31  DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
      32  #endif
      33  #if __GNUC_PREREQ (11, 0)
      34  /* Likewise GCC 11, with a different warning option.  */
      35  DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
      36  #endif
      37  
      38  /* Find the first occurrence of C in S.  */
      39  void *
      40  RAWMEMCHR (const void *s, int c)
      41  {
      42    if ((unsigned char) c != '\0')
      43      return memchr (s, c, (size_t)-1);
      44    return (char *)s + strlen (s);
      45  }
      46  libc_hidden_def (__rawmemchr)
      47  weak_alias (__rawmemchr, rawmemchr)
      48  
      49  DIAG_POP_NEEDS_COMMENT;