/*
**  stptok() -- public domain by Ray Gardner, modified by Bob Stout
**
**   You pass this function a string to parse, a buffer to receive the
**   "token" that gets scanned, the length of the buffer, and a string of
**   "break" characters that stop the scan.  It will copy the string into
**   the buffer up to any of the break characters, or until the buffer is
**   full, and will always leave the buffer null-terminated.  It will
**   return a pointer to the first non-breaking character after the one
**   that stopped the scan.
*/

#include <string.h>
#include <stdlib.h>

char *stptok(const char *s, char *tok, size_t toklen, char *brk)
{
      char *lim, *b;

      if (!*s)
            return NULL;

      lim = tok + toklen - 1;
      while ( *s && tok < lim )
      {
            for ( b = brk; *b; b++ )
            {
                  if ( *s == *b )
                  {
                        *tok = 0;
                        return (char *)s;
                  }
            }
            *tok++ = *s++;
      }
      *tok = 0;
      return (char *)s;
}