tokenizer.c

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#include <GKlib.h>
 
 
/************************************************************************
* This function tokenizes a string based on the user-supplied delimiters
* list. The resulting tokens are returned into an array of strings.
*************************************************************************/
void gk_strtokenize(char *str, char *delim, gk_Tokens_t *tokens)
{
  int i, ntoks, slen;
 
  tokens->strbuf = gk_strdup(str);
 
  slen  = strlen(str);
  str   = tokens->strbuf;
 
  /* Scan once to determine the number of tokens */
  for (ntoks=0, i=0; i<slen;) {
    /* Consume all the consecutive characters from the delimiters list */
    while (i<slen && strchr(delim, str[i])) 
      i++;
 
    if (i == slen)
      break;
 
    ntoks++;
 
    /* Consume all the consecutive characters from the token */
    while (i<slen && !strchr(delim, str[i])) 
      i++;
  }
 
 
  tokens->ntoks = ntoks;
  tokens->list  = (char **)gk_malloc(ntoks*sizeof(char *), "strtokenize: tokens->list");
 
 
  /* Scan a second time to mark and link the tokens */
  for (ntoks=0, i=0; i<slen;) {
    /* Consume all the consecutive characters from the delimiters list */
    while (i<slen && strchr(delim, str[i])) 
      str[i++] = '\0';
 
    if (i == slen)
      break;
 
    tokens->list[ntoks++] = str+i;
 
    /* Consume all the consecutive characters from the token */
    while (i<slen && !strchr(delim, str[i])) 
      i++;
  }
}
 
 
/************************************************************************
* This function frees the memory associated with a gk_Tokens_t
*************************************************************************/
void gk_freetokenslist(gk_Tokens_t *tokens)
{
  gk_free((void *)&tokens->list, &tokens->strbuf, LTERM);
}