string splitting in C (a la PHP's explode())

strsplit.c

char **strsplit(const char *s, int delim) {
  int      state;
  char    *sout;
  char   **out;
  size_t    i, count, word;
  
  /* Skip any leading delimiters. */
  while(*s == delim)
    ++s;
  
  /* Count the number of words in the string. */
  state = 1;
  count = 0;
  
  for(i = 0; s[i] != 0; ++i) {
    /* Flip into state 1 (delimiter skip state). */
    if(s[i] == delim && state == 0)
      state ^= 1;
    
    /* Flip into state 0 (word skip state). */
    else if(s[i] != delim && state == 1) {
      state ^= 1;
      ++count;
    }
  }
  
  /* Allocate pointer for each word and a NULL terminator. */
  out = malloc((count + 1) * sizeof *out);
  if(out == NULL)
    return NULL;
  
  /* Make a copy of the input. */
  sout = malloc(i + 1);
  
  /* Set pointers in string array. */
  state = 1;
  word  = 0;
  
  while(*s) {
    if(*s == delim && state == 0) {
      state   ^= 1;
      *sout++  = 0;
    }
    
    if(*s != delim) {
      if(state != 0) {
        state        ^= 1;
        out[word++]  = sout;
      }
      *sout++ = *s;
    }
    
    ++s;
  }
  
  /* Add NULL terminator. */
  out[word] = NULL;
  
  return out;
}