strndup.c

/*
 *
 * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
 * All rights reserved.
 *
 * This file is part of libtrace.
 *
 * This code has been developed by the University of Waikato WAND
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * libtrace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */
#include "config.h"
#if !HAVE_DECL_STRNDUP

#    include <stdlib.h>
#    include <errno.h>
#    include <string.h>

#    include <libtrace_int.h>

/* Some systems don't include strndup as part of their standard C library, so
 * we need to provide our own version.
 *
 * Full credit to Matthew Luckie, who wrote this particular version and allowed
 * us to borrow it.
 */

char *strndup(const char *s, size_t size)
{
    char *str;
    size_t len;

    if (size == 0 || s == NULL) {
        errno = EINVAL;
        return NULL;
    }

    if (size > (len = strlen(s))) {
        size = len + 1;
    }

    if ((str = malloc(size)) == NULL) {
        errno = ENOMEM;
        return NULL;
    }

    memcpy(str, s, size);
    str[size - 1] = '\0';

    return str;
}

#endif