/* crypto/o_str.c */
/*
 * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
 * 2003.
 */
/* ====================================================================
 * Copyright (c) 2003 The OpenSSL Project.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <ctype.h>
#include <limits.h>
#include <e_os.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
#include "internal/o_str.h"

#if !defined(OPENSSL_IMPLEMENTS_strncasecmp) && \
    !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_WINCE) && \
    !defined(NETWARE_CLIB)
# include <strings.h>
#endif

int OPENSSL_strncasecmp(const char *str1, const char *str2, size_t n)
{
#if defined(OPENSSL_IMPLEMENTS_strncasecmp)
    while (*str1 && *str2 && n) {
        int res = toupper(*str1) - toupper(*str2);
        if (res)
            return res < 0 ? -1 : 1;
        str1++;
        str2++;
        n--;
    }
    if (n == 0)
        return 0;
    if (*str1)
        return 1;
    if (*str2)
        return -1;
    return 0;
#else
    /*
     * Recursion hazard warning! Whenever strncasecmp is #defined as
     * OPENSSL_strncasecmp, OPENSSL_IMPLEMENTS_strncasecmp must be defined as
     * well.
     */
    return strncasecmp(str1, str2, n);
#endif
}

int OPENSSL_strcasecmp(const char *str1, const char *str2)
{
#if defined(OPENSSL_IMPLEMENTS_strncasecmp)
    return OPENSSL_strncasecmp(str1, str2, (size_t)-1);
#else
    return strcasecmp(str1, str2);
#endif
}

int OPENSSL_memcmp(const void *v1, const void *v2, size_t n)
{
    const unsigned char *c1 = v1, *c2 = v2;
    int ret = 0;

    while (n && (ret = *c1 - *c2) == 0)
        n--, c1++, c2++;

    return ret;
}

char *CRYPTO_strdup(const char *str, const char* file, int line)
{
    char *ret;

    if (str == NULL)
        return NULL;
    ret = CRYPTO_malloc(strlen(str) + 1, file, line);
    if (ret != NULL)
        strcpy(ret, str);
    return ret;
}

char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line)
{
    const char *cp;
    size_t maxlen;
    char *ret;

    if (str == NULL)
        return NULL;

    /* Get length. */
    for (cp = str, maxlen = s; maxlen-- != 0 && *cp != '\0'; ++cp)
        continue;
    maxlen = cp - str;

    ret = CRYPTO_malloc(maxlen + 1, file, line);
    if (ret) {
        memcpy(ret, str, maxlen);
        ret[maxlen] = '\0';
    }
    return ret;
}

void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line)
{
    void *ret;

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

    ret = CRYPTO_malloc(siz, file, line);
    if (ret == NULL) {
        CRYPTOerr(CRYPTO_F_CRYPTO_MEMDUP, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    return memcpy(ret, data, siz);
}

size_t OPENSSL_strnlen(const char *str, size_t maxlen)
{
    const char *p;

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

    return p - str;
}

size_t OPENSSL_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 OPENSSL_strlcat(char *dst, const char *src, size_t size)
{
    size_t l = 0;
    for (; size > 0 && *dst; size--, dst++)
        l++;
    return l + OPENSSL_strlcpy(dst, src, size);
}