/* crypto/buffer/buffer.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <limits.h>

#include <openssl/buffer.h>

size_t BUF_strnlen(const char *str, size_t maxlen)

{

    const char *p;

    for (p = str; maxlen-- != 0 && *p != '\0'; ++p) ;

    return p - str;

}

char *BUF_strdup(const char *str)

{

    if (str == NULL)

        return NULL;

    return BUF_strndup(str, strlen(str));

}

char *BUF_strndup(const char *str, size_t siz)

{

    char *ret;

    if (str == NULL)

        return NULL;

    siz = BUF_strnlen(str, siz);

    if (siz >= INT_MAX)

        return NULL;

    ret = OPENSSL_malloc(siz + 1);

    if (ret == NULL) {

        BUFerr(BUF_F_BUF_STRNDUP, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    memcpy(ret, str, siz);

    ret[siz] = '\0';

    return (ret);

}

void *BUF_memdup(const void *data, size_t siz)

{

    void *ret;

    if (data == NULL || siz >= INT_MAX)

        return NULL;

    ret = OPENSSL_malloc(siz);

    if (ret == NULL) {

        BUFerr(BUF_F_BUF_MEMDUP, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    return memcpy(ret, data, siz);

}

size_t BUF_strlcpy(char *dst, const char *src, size_t size)

{

    size_t l = 0;

    for (; size > 1 && *src; size--) {

        *dst++ = *src++;

        l++;

    }

    if (size)

        *dst = '\0';

    return l + strlen(src);

}

size_t BUF_strlcat(char *dst, const char *src, size_t size)

{

    size_t l = 0;

    for (; size > 0 && *dst; size--, dst++)

        l++;

    return l + BUF_strlcpy(dst, src, size);

}