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      1 /* Reentrant string tokenizer.  Generic version.
      2    Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2022 Free Software
      3    Foundation, Inc.
      4    This file is part of the GNU C Library.
      5 
      6    This file is free software: you can redistribute it and/or modify
      7    it under the terms of the GNU Lesser General Public License as
      8    published by the Free Software Foundation; either version 2.1 of the
      9    License, or (at your option) any later version.
     10 
     11    This file is distributed in the hope that it will be useful,
     12    but WITHOUT ANY WARRANTY; without even the implied warranty of
     13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14    GNU Lesser General Public License for more details.
     15 
     16    You should have received a copy of the GNU Lesser General Public License
     17    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
     18 
     19 #ifdef HAVE_CONFIG_H
     20 # include <config.h>
     21 #endif
     22 
     23 #include <string.h>
     24 
     25 #ifdef _LIBC
     26 # undef strtok_r
     27 # undef __strtok_r
     28 #else
     29 # define __strtok_r strtok_r
     30 # define __rawmemchr strchr
     31 #endif
     32 
     33 /* Parse S into tokens separated by characters in DELIM.
     34    If S is NULL, the saved pointer in SAVE_PTR is used as
     35    the next starting point.  For example:
     36         char s[] = "-abc-=-def";
     37         char *sp;
     38         x = strtok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
     39         x = strtok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
     40         x = strtok_r(NULL, "=", &sp);   // x = NULL
     41                 // s = "abc\0-def\0"
     42 */
     43 char *
     44 __strtok_r (char *s, const char *delim, char **save_ptr)
     45 {
     46   char *token;
     47 
     48   if (s == NULL)
     49     s = *save_ptr;
     50 
     51   /* Scan leading delimiters.  */
     52   s += strspn (s, delim);
     53   if (*s == '\0')
     54     {
     55       *save_ptr = s;
     56       return NULL;
     57     }
     58 
     59   /* Find the end of the token.  */
     60   token = s;
     61   s = strpbrk (token, delim);
     62   if (s == NULL)
     63     /* This token finishes the string.  */
     64     *save_ptr = __rawmemchr (token, '\0');
     65   else
     66     {
     67       /* Terminate the token and make *SAVE_PTR point past it.  */
     68       *s = '\0';
     69       *save_ptr = s + 1;
     70     }
     71   return token;
     72 }
     73 #ifdef weak_alias
     74 libc_hidden_def (__strtok_r)
     75 weak_alias (__strtok_r, strtok_r)
     76 #endif
     77