crypto/openssl-0.9.7d/crypto/buffer/buffer.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 "cryptlib.h"
  61 #include <openssl/buffer.h>
  62
  63 BUF_MEM *BUF_MEM_new(void)
  64         {
  65         BUF_MEM *ret;
  66
  67         ret=OPENSSL_malloc(sizeof(BUF_MEM));
  68         if (ret == NULL)
  69                 {
  70                 BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
  71                 return(NULL);
  72                 }
  73         ret->length=0;
  74         ret->max=0;
  75         ret->data=NULL;
  76         return(ret);
  77         }
  78
  79 void BUF_MEM_free(BUF_MEM *a)
  80         {
  81         if(a == NULL)
  82             return;
  83
  84         if (a->data != NULL)
  85                 {
  86                 memset(a->data,0,(unsigned int)a->max);
  87                 OPENSSL_free(a->data);
  88                 }
  89         OPENSSL_free(a);
  90         }
  91
  92 int BUF_MEM_grow(BUF_MEM *str, int len)
  93         {
  94         char *ret;
  95         unsigned int n;
  96
  97         if (str->length >= len)
  98                 {
  99                 str->length=len;
 100                 return(len);
 101                 }
 102         if (str->max >= len)
 103                 {
 104                 memset(&str->data[str->length],0,len-str->length);
 105                 str->length=len;
 106                 return(len);
 107                 }
 108         n=(len+3)/3*4;
 109         if (str->data == NULL)
 110                 ret=OPENSSL_malloc(n);
 111         else
 112                 ret=OPENSSL_realloc(str->data,n);
 113         if (ret == NULL)
 114                 {
 115                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 116                 len=0;
 117                 }
 118         else
 119                 {
 120                 str->data=ret;
 121                 str->max=n;
 122                 memset(&str->data[str->length],0,len-str->length);
 123                 str->length=len;
 124                 }
 125         return(len);
 126         }
 127
 128 int BUF_MEM_grow_clean(BUF_MEM *str, int len)
 129         {
 130         char *ret;
 131         unsigned int n;
 132
 133         if (str->length >= len)
 134                 {
 135                 memset(&str->data[len],0,str->length-len);
 136                 str->length=len;
 137                 return(len);
 138                 }
 139         if (str->max >= len)
 140                 {
 141                 memset(&str->data[str->length],0,len-str->length);
 142                 str->length=len;
 143                 return(len);
 144                 }
 145         n=(len+3)/3*4;
 146         if (str->data == NULL)
 147                 ret=OPENSSL_malloc(n);
 148         else
 149                 ret=OPENSSL_realloc_clean(str->data,str->max,n);
 150         if (ret == NULL)
 151                 {
 152                 BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
 153                 len=0;
 154                 }
 155         else
 156                 {
 157                 str->data=ret;
 158                 str->max=n;
 159                 memset(&str->data[str->length],0,len-str->length);
 160                 str->length=len;
 161                 }
 162         return(len);
 163         }
 164
 165 char *BUF_strdup(const char *str)
 166         {
 167         char *ret;
 168         int n;
 169
 170         if (str == NULL) return(NULL);
 171
 172         n=strlen(str);
 173         ret=OPENSSL_malloc(n+1);
 174         if (ret == NULL)
 175                 {
 176                 BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE);
 177                 return(NULL);
 178                 }
 179         memcpy(ret,str,n+1);
 180         return(ret);
 181         }
 182
 183 size_t BUF_strlcpy(char *dst, const char *src, size_t size)
 184         {
 185         size_t l = 0;
 186         for(; size > 1 && *src; size--)
 187                 {
 188                 *dst++ = *src++;
 189                 l++;
 190                 }
 191         if (size)
 192                 *dst = '\0';
 193         return l + strlen(src);
 194         }
 195
 196 size_t BUF_strlcat(char *dst, const char *src, size_t size)
 197         {
 198         size_t l = 0;
 199         for(; size > 0 && *dst; size--, dst++)
 200                 l++;
 201         return l + BUF_strlcpy(dst, src, size);
 202         }