/*

 * Copyright 2003-2019 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "e_os.h"

#include <limits.h>

#include <openssl/crypto.h>

#include "internal/cryptlib.h"

#include "internal/o_str.h"

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)

{

    size_t maxlen;

    char *ret;

    if (str == NULL)

        return NULL;

    maxlen = OPENSSL_strnlen(str, s);

    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);

}

int OPENSSL_hexchar2int(unsigned char c)

{

#ifdef CHARSET_EBCDIC

    c = os_toebcdic[c];

#endif

    switch (c) {

    case '0':

        return 0;

    case '1':

        return 1;

    case '2':

        return 2;

    case '3':

        return 3;

    case '4':

          return 4;

    case '5':

          return 5;

    case '6':

          return 6;

    case '7':

          return 7;

    case '8':

          return 8;

    case '9':

          return 9;

    case 'a': case 'A':

          return 0x0A;

    case 'b': case 'B':

          return 0x0B;

    case 'c': case 'C':

          return 0x0C;

    case 'd': case 'D':

          return 0x0D;

    case 'e': case 'E':

          return 0x0E;

    case 'f': case 'F':

          return 0x0F;

    }

    return -1;

}

/*

 * Give a string of hex digits convert to a buffer

 */

unsigned char *OPENSSL_hexstr2buf(const char *str, long *len)

{

    unsigned char *hexbuf, *q;

    unsigned char ch, cl;

    int chi, cli;

    const unsigned char *p;

    size_t s;

    s = strlen(str);

    if ((hexbuf = OPENSSL_malloc(s >> 1)) == NULL) {

        CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    for (p = (const unsigned char *)str, q = hexbuf; *p; ) {

        ch = *p++;

        if (ch == ':')

            continue;

        cl = *p++;

        if (!cl) {

            CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF,

                      CRYPTO_R_ODD_NUMBER_OF_DIGITS);

            OPENSSL_free(hexbuf);

            return NULL;

        }

        cli = OPENSSL_hexchar2int(cl);

        chi = OPENSSL_hexchar2int(ch);

        if (cli < 0 || chi < 0) {

            OPENSSL_free(hexbuf);

            CRYPTOerr(CRYPTO_F_OPENSSL_HEXSTR2BUF, CRYPTO_R_ILLEGAL_HEX_DIGIT);

            return NULL;

        }

        *q++ = (unsigned char)((chi << 4) | cli);

    }

    if (len)

        *len = q - hexbuf;

    return hexbuf;

}

/*

 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its

 * hex representation @@@ (Contents of buffer are always kept in ASCII, also

 * on EBCDIC machines)

 */

char *OPENSSL_buf2hexstr(const unsigned char *buffer, long len)

{

    static const char hexdig[] = "0123456789ABCDEF";

    char *tmp, *q;

    const unsigned char *p;

    int i;

    if (len == 0)

    {

        return OPENSSL_zalloc(1);

    }

    if ((tmp = OPENSSL_malloc(len * 3)) == NULL) {

        CRYPTOerr(CRYPTO_F_OPENSSL_BUF2HEXSTR, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    q = tmp;

    for (i = 0, p = buffer; i < len; i++, p++) {

        *q++ = hexdig[(*p >> 4) & 0xf];

        *q++ = hexdig[*p & 0xf];

        *q++ = ':';

    }

    q[-1] = 0;

#ifdef CHARSET_EBCDIC

    ebcdic2ascii(tmp, tmp, q - tmp - 1);

#endif

    return tmp;

}

int openssl_strerror_r(int errnum, char *buf, size_t buflen)

{

#if defined(_MSC_VER) && _MSC_VER>=1400

    return !strerror_s(buf, buflen, errnum);

#elif defined(_GNU_SOURCE)

    char *err;

    /*

     * GNU strerror_r may not actually set buf.

     * It can return a pointer to some (immutable) static string in which case

     * buf is left unused.

     */

    err = strerror_r(errnum, buf, buflen);

    if (err == NULL || buflen == 0)

        return 0;

    /*

     * If err is statically allocated, err != buf and we need to copy the data.

     * If err points somewhere inside buf, OPENSSL_strlcpy can handle this,

     * since src and dest are not annotated with __restrict and the function

     * reads src byte for byte and writes to dest.

     * If err == buf we do not have to copy anything.

     */

    if (err != buf)

        OPENSSL_strlcpy(buf, err, buflen);

    return 1;

#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \

      (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)

    /*

     * We can use "real" strerror_r. The OpenSSL version differs in that it

     * gives 1 on success and 0 on failure for consistency with other OpenSSL

     * functions. Real strerror_r does it the other way around

     */

    return !strerror_r(errnum, buf, buflen);

#else

    char *err;

    /* Fall back to non-thread safe strerror()...its all we can do */

    if (buflen < 2)

        return 0;

    err = strerror(errnum);

    /* Can this ever happen? */

    if (err == NULL)

        return 0;

    OPENSSL_strlcpy(buf, err, buflen);

    return 1;

#endif

}