lib/ansi/strtok.c

   1 /*
   2  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
   3  * See the copyright notice in the ACK home directory, in the file "Copyright".
   4  */
   5 /* $Header$ */
   6
   7 #include        <string.h>
   8
   9 char *
  10 strtok(register char *string, const char *separators)
  11 {
  12         register char *s1, *s2;
  13         static char *savestring;
  14
  15         if (string == NULL) {
  16                 string = savestring;
  17                 if (string == NULL) return (char *)NULL;
  18         }
  19
  20         s1 = string + strspn(string, separators);
  21         if (*s1 == '\0') {
  22                 savestring = NULL;
  23                 return (char *)NULL;
  24         }
  25
  26         s2 = strpbrk(s1, separators);
  27         if (s2 != NULL)
  28                 *s2++ = '\0';
  29         savestring = s2;
  30         return s1;
  31 }