1  /* Searching in a string.
       2     Copyright (C) 2001-2003, 2006, 2009-2023 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 3 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  
      18  /* The functions defined in this file assume a nearly ASCII compatible
      19     character set.  */
      20  
      21  
      22  #ifdef __cplusplus
      23  extern "C" {
      24  #endif
      25  
      26  /* Find the first occurrence of NEEDLE in HAYSTACK.
      27     This function is safe to be called, even in a multibyte locale, if NEEDLE
      28       1. consists solely of printable ASCII characters excluding '\\' and '~'
      29          [this restriction is needed because of Shift_JIS and JOHAB]
      30          or of the control ASCII characters '\a' '\b' '\f' '\n' '\r' '\t' '\v'
      31          [this restriction is needed because of VISCII], and
      32       2. has at least length 2
      33          [this restriction is needed because of BIG5, BIG5-HKSCS, GBK, GB18030,
      34           Shift_JIS, JOHAB], and
      35       3. does not consist entirely of decimal digits, or has at least length 4
      36          [this restriction is needed because of GB18030].
      37     This function is also safe to be called, even in a multibyte locale, if
      38     HAYSTACK and NEEDLE are known to both consist solely of printable ASCII
      39     characters excluding '\\' and '~'.  */
      40  extern char *c_strstr (const char *haystack, const char *needle);
      41  
      42  #ifdef __cplusplus
      43  }
      44  #endif