xref: /freebsd-9.3-release/usr.bin/m4/lib/ohash_create_entry.c

/* $OpenBSD: ohash_create_entry.c,v 1.2 2004/06/22 20:00:16 espie Exp $ */
/* ex:ts=8 sw=4:
 */

/* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "ohash_int.h"

/* This handles the common case of variable length keys, where the
 * key is stored at the end of the record.
 */
void *
ohash_create_entry(struct ohash_info *i, const char *start, const char **end)
{
	char *p;

	if (!*end)
		*end = start + strlen(start);
	p = (i->alloc)(i->key_offset + (*end - start) + 1, i->data);
	if (p) {
	    memcpy(p+i->key_offset, start, *end-start);
	    p[i->key_offset + (*end - start)] = '\0';
	}
	return (void *)p;
}