crypto/buffer/buf_str.c

   1 /* crypto/buffer/buffer.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <limits.h>
  61 #include "internal/cryptlib.h"
  62 #include <openssl/buffer.h>
  63
  64 size_t BUF_strnlen(const char *str, size_t maxlen)
  65 {
  66     const char *p;
  67
  68     for (p = str; maxlen-- != 0 && *p != '\0'; ++p) ;
  69
  70     return p - str;
  71 }
  72
  73 char *BUF_strdup(const char *str)
  74 {
  75     if (str == NULL)
  76         return NULL;
  77     return BUF_strndup(str, strlen(str));
  78 }
  79
  80 char *BUF_strndup(const char *str, size_t siz)
  81 {
  82     char *ret;
  83
  84     if (str == NULL)
  85         return NULL;
  86
  87     siz = BUF_strnlen(str, siz);
  88
  89     if (siz >= INT_MAX)
  90         return NULL;
  91
  92     ret = OPENSSL_malloc(siz + 1);
  93     if (ret == NULL) {
  94         BUFerr(BUF_F_BUF_STRNDUP, ERR_R_MALLOC_FAILURE);
  95         return NULL;
  96     }
  97
  98     memcpy(ret, str, siz);
  99     ret[siz] = '\0';
 100
 101     return (ret);
 102 }
 103
 104 void *BUF_memdup(const void *data, size_t siz)
 105 {
 106     void *ret;
 107
 108     if (data == NULL || siz >= INT_MAX)
 109         return NULL;
 110
 111     ret = OPENSSL_malloc(siz);
 112     if (ret == NULL) {
 113         BUFerr(BUF_F_BUF_MEMDUP, ERR_R_MALLOC_FAILURE);
 114         return NULL;
 115     }
 116     return memcpy(ret, data, siz);
 117 }
 118
 119 size_t BUF_strlcpy(char *dst, const char *src, size_t size)
 120 {
 121     size_t l = 0;
 122     for (; size > 1 && *src; size--) {
 123         *dst++ = *src++;
 124         l++;
 125     }
 126     if (size)
 127         *dst = '\0';
 128     return l + strlen(src);
 129 }
 130
 131 size_t BUF_strlcat(char *dst, const char *src, size_t size)
 132 {
 133     size_t l = 0;
 134     for (; size > 0 && *dst; size--, dst++)
 135         l++;
 136     return l + BUF_strlcpy(dst, src, size);
 137 }