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/*!
\file tokenizer.c
\brief String tokenization routines
This file contains various routines for splitting an input string into
tokens and returning them in form of a list. The goal is to mimic perl's
split function.
\date Started 11/23/04
\author George
\version\verbatim $Id: tokenizer.c 10711 2011-08-31 22:23:04Z karypis $ \endverbatim
*/
#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);
}
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