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curl/lib/strdup.c
Daniel Stenberg 7c992dd9f8
lib: rename Curl_strndup to Curl_memdup0 to avoid misunderstanding
Since the copy does not stop at a null byte, let's not call it anything
that makes you think it works like the common strndup() function.

Based on feedback from Jay Satiro, Stefan Eissing and Patrick Monnerat

Closes 
2023-12-08 17:22:33 +01:00

144 lines
3.9 KiB
C

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#ifdef _WIN32
#include <wchar.h>
#endif
#include "strdup.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
#ifndef HAVE_STRDUP
char *Curl_strdup(const char *str)
{
size_t len;
char *newstr;
if(!str)
return (char *)NULL;
len = strlen(str) + 1;
newstr = malloc(len);
if(!newstr)
return (char *)NULL;
memcpy(newstr, str, len);
return newstr;
}
#endif
#ifdef _WIN32
/***************************************************************************
*
* Curl_wcsdup(source)
*
* Copies the 'source' wchar string to a newly allocated buffer (that is
* returned).
*
* Returns the new pointer or NULL on failure.
*
***************************************************************************/
wchar_t *Curl_wcsdup(const wchar_t *src)
{
size_t length = wcslen(src);
if(length > (SIZE_T_MAX / sizeof(wchar_t)) - 1)
return (wchar_t *)NULL; /* integer overflow */
return (wchar_t *)Curl_memdup(src, (length + 1) * sizeof(wchar_t));
}
#endif
/***************************************************************************
*
* Curl_memdup(source, length)
*
* Copies the 'source' data to a newly allocated buffer (that is
* returned). Copies 'length' bytes.
*
* Returns the new pointer or NULL on failure.
*
***************************************************************************/
void *Curl_memdup(const void *src, size_t length)
{
void *buffer = malloc(length);
if(!buffer)
return NULL; /* fail */
memcpy(buffer, src, length);
return buffer;
}
/***************************************************************************
*
* Curl_memdup0(source, length)
*
* Copies the 'source' string to a newly allocated buffer (that is returned).
* Copies 'length' bytes then adds a null terminator.
*
* Returns the new pointer or NULL on failure.
*
***************************************************************************/
void *Curl_memdup0(const char *src, size_t length)
{
char *buf = malloc(length + 1);
if(!buf)
return NULL;
memcpy(buf, src, length);
buf[length] = 0;
return buf;
}
/***************************************************************************
*
* Curl_saferealloc(ptr, size)
*
* Does a normal realloc(), but will free the data pointer if the realloc
* fails. If 'size' is non-zero, it will free the data and return a failure.
*
* This convenience function is provided and used to help us avoid a common
* mistake pattern when we could pass in a zero, catch the NULL return and end
* up free'ing the memory twice.
*
* Returns the new pointer or NULL on failure.
*
***************************************************************************/
void *Curl_saferealloc(void *ptr, size_t size)
{
void *datap = realloc(ptr, size);
if(size && !datap)
/* only free 'ptr' if size was non-zero */
free(ptr);
return datap;
}