ref: e14d6249749a1101abdad7998e1cd5cdc49e137a
dir: /sys/src/ape/lib/openssl/crypto/buffer/buffer.c/
/* crypto/buffer/buffer.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
BUF_MEM *BUF_MEM_new(void)
{
BUF_MEM *ret;
ret=OPENSSL_malloc(sizeof(BUF_MEM));
if (ret == NULL)
{
BUFerr(BUF_F_BUF_MEM_NEW,ERR_R_MALLOC_FAILURE);
return(NULL);
}
ret->length=0;
ret->max=0;
ret->data=NULL;
return(ret);
}
void BUF_MEM_free(BUF_MEM *a)
{
if(a == NULL)
return;
if (a->data != NULL)
{
memset(a->data,0,(unsigned int)a->max);
OPENSSL_free(a->data);
}
OPENSSL_free(a);
}
int BUF_MEM_grow(BUF_MEM *str, int len)
{
char *ret;
unsigned int n;
if (str->length >= len)
{
str->length=len;
return(len);
}
if (str->max >= len)
{
memset(&str->data[str->length],0,len-str->length);
str->length=len;
return(len);
}
n=(len+3)/3*4;
if (str->data == NULL)
ret=OPENSSL_malloc(n);
else
ret=OPENSSL_realloc(str->data,n);
if (ret == NULL)
{
BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
len=0;
}
else
{
str->data=ret;
str->max=n;
memset(&str->data[str->length],0,len-str->length);
str->length=len;
}
return(len);
}
int BUF_MEM_grow_clean(BUF_MEM *str, int len)
{
char *ret;
unsigned int n;
if (str->length >= len)
{
memset(&str->data[len],0,str->length-len);
str->length=len;
return(len);
}
if (str->max >= len)
{
memset(&str->data[str->length],0,len-str->length);
str->length=len;
return(len);
}
n=(len+3)/3*4;
if (str->data == NULL)
ret=OPENSSL_malloc(n);
else
ret=OPENSSL_realloc_clean(str->data,str->max,n);
if (ret == NULL)
{
BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
len=0;
}
else
{
str->data=ret;
str->max=n;
memset(&str->data[str->length],0,len-str->length);
str->length=len;
}
return(len);
}
char *BUF_strdup(const char *str)
{
if (str == NULL) return(NULL);
return BUF_strndup(str, strlen(str));
}
char *BUF_strndup(const char *str, size_t siz)
{
char *ret;
if (str == NULL) return(NULL);
ret=OPENSSL_malloc(siz+1);
if (ret == NULL)
{
BUFerr(BUF_F_BUF_STRNDUP,ERR_R_MALLOC_FAILURE);
return(NULL);
}
BUF_strlcpy(ret,str,siz+1);
return(ret);
}
void *BUF_memdup(const void *data, size_t siz)
{
void *ret;
if (data == NULL) return(NULL);
ret=OPENSSL_malloc(siz);
if (ret == NULL)
{
BUFerr(BUF_F_BUF_MEMDUP,ERR_R_MALLOC_FAILURE);
return(NULL);
}
return memcpy(ret, data, siz);
}
size_t BUF_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 BUF_strlcat(char *dst, const char *src, size_t size)
{
size_t l = 0;
for(; size > 0 && *dst; size--, dst++)
l++;
return l + BUF_strlcpy(dst, src, size);
}