wcsnlen.c revision 2
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/*
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * CDDL HEADER START
9512fe850e98fdd448c638ca63fdd92a8a510255ahl *
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9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Common Development and Distribution License (the "License").
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * You may not use this file except in compliance with the License.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * or http://www.opensolaris.org/os/licensing.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * See the License for the specific language governing permissions
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * and limitations under the License.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * When distributing Covered Code, include this CDDL HEADER in each
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * If applicable, add the following below this CDDL HEADER, with the
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * fields enclosed by brackets "[]" replaced with your own identifying
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * information: Portions Copyright [yyyy] [name of copyright owner]
9512fe850e98fdd448c638ca63fdd92a8a510255ahl *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * CDDL HEADER END
9512fe850e98fdd448c638ca63fdd92a8a510255ahl */
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/*
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl */
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/*
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Returns the number of non-NULL characters in str,
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * but not more than maxlen. Does not look past str + maxlen.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl */
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#include "lint.h"
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#include <stdlib.h>
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#include <wchar.h>
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahlsize_t
9512fe850e98fdd448c638ca63fdd92a8a510255ahlwcsnlen(const wchar_t *str, size_t maxlen)
9512fe850e98fdd448c638ca63fdd92a8a510255ahl{
9512fe850e98fdd448c638ca63fdd92a8a510255ahl const wchar_t *ptr = str;
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl if (maxlen != 0) {
9512fe850e98fdd448c638ca63fdd92a8a510255ahl do {
9512fe850e98fdd448c638ca63fdd92a8a510255ahl if (*ptr++ == L'\0') {
ptr--;
break;
}
} while (--maxlen != 0);
}
return (ptr - str);
}