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tok.c
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tok.c
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/* tok.c -- utility for string tokenisation
*
* Copyright (c) 2011 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <string.h>
#include <ctype.h>
#include "tok.h"
#include "xmalloc.h"
EXPORTED void tok_init(tok_t *t, const char *str, const char *sep, int flags)
{
tok_initm(t, str ? xstrdup(str) : NULL, sep, flags|TOK_FREEBUFFER);
}
EXPORTED void tok_initm(tok_t *t, char *str, const char *sep, int flags)
{
memset(t, 0, sizeof(*t));
t->buf = str;
t->sep = sep;
t->flags = flags | _TOK_FIRST;
}
EXPORTED void tok_fini(tok_t *t)
{
if ((t->flags & TOK_FREEBUFFER))
free(t->buf);
memset(t, 0, sizeof(*t));
}
EXPORTED char *tok_next(tok_t *t)
{
const char *sep;
char *token;
/* initialising us with a NULL buffer is harmless */
if (!t->buf)
return NULL;
/* use the given separator or the default separator string */
sep = (t->sep ? t->sep : " \t\n\r");
if ((t->flags & TOK_EMPTY)) {
if ((t->flags & _TOK_FIRST)) {
t->flags &= ~_TOK_FIRST;
t->state = t->buf;
}
token = strsep(&t->state, sep);
}
else {
char *buf = NULL;
if ((t->flags & _TOK_FIRST)) {
/* strtok_r() wants the buffer only the first time */
t->flags &= ~_TOK_FIRST;
buf = t->buf;
}
token = strtok_r(buf, sep, &t->state);
}
if (!token) {
/* end of tokens; clean up the tok_t to ensure we don't
* leak any memory even if the caller doesn't call tok_fini() */
tok_fini(t);
return NULL;
}
/* we have a token, perform any additional munging */
if ((t->flags & TOK_TRIMLEFT)) {
while (*token && isspace(*token))
token++;
}
if ((t->flags & TOK_TRIMRIGHT)) {
char *p = token + strlen(token) - 1;
while (p >= token && isspace(*p))
*p-- = '\0';
}
t->curr = token;
return token;
}
EXPORTED unsigned int tok_offset(const tok_t *t)
{
if (!t->buf || !t->curr)
return 0;
return (t->curr - t->buf);
}

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