path: root/contrib/libs/openssl/crypto/o_str.c

/* 
 * Copyright 2003-2020 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 && !defined(_WIN32_WCE)
    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 
}