compat/strtok_r.c

   1 /* Reentrant string tokenizer.  Generic version.
   2    Copyright (C) 1991,1996-1999,2001,2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include "../git-compat-util.h"
  21
  22 /* Parse S into tokens separated by characters in DELIM.
  23    If S is NULL, the saved pointer in SAVE_PTR is used as
  24    the next starting point.  For example:
  25         char s[] = "-abc-=-def";
  26         char *sp;
  27         x = strtok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
  28         x = strtok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
  29         x = strtok_r(NULL, "=", &sp);   // x = NULL
  30                 // s = "abc\0-def\0"
  31 */
  32 char *
  33 gitstrtok_r (char *s, const char *delim, char **save_ptr)
  34 {
  35   char *token;
  36
  37   if (s == NULL)
  38     s = *save_ptr;
  39
  40   /* Scan leading delimiters.  */
  41   s += strspn (s, delim);
  42   if (*s == '\0')
  43     {
  44       *save_ptr = s;
  45       return NULL;
  46     }
  47
  48   /* Find the end of the token.  */
  49   token = s;
  50   s = strpbrk (token, delim);
  51   if (s == NULL)
  52     /* This token finishes the string.  */
  53     *save_ptr = token + strlen (token);
  54   else
  55     {
  56       /* Terminate the token and make *SAVE_PTR point past it.  */
  57       *s = '\0';
  58       *save_ptr = s + 1;
  59     }
  60   return token;
  61 }