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curl/lib/strdup.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
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* Copyright (C) 1998 - 2017, 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.haxx.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.
*
***************************************************************************/
build: fix circular header inclusion with other packages This commit renames lib/setup.h to lib/curl_setup.h and renames lib/setup_once.h to lib/curl_setup_once.h. Removes the need and usage of a header inclusion guard foreign to libcurl. [1] Removes the need and presence of an alarming notice we carried in old setup_once.h [2] ---------------------------------------- 1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H, this single inclusion guard is enough to ensure that inclusion of lib/setup_once.h done from lib/setup.h is only done once. Additionally lib/setup.h has always used __SETUP_ONCE_H macro to protect inclusion of setup_once.h even after commit ec691ca3, this was to avoid a circular header inclusion triggered when building a c-ares enabled version with c-ares sources available which also has a setup_once.h header. Commit ec691ca3 exposes the real nature of __SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard foreign to libcurl belonging to c-ares's setup_once.h The renaming this commit does, fixes the circular header inclusion, and as such removes the need and usage of a header inclusion guard foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl. 2 - Due to the circular interdependency of old lib/setup_once.h and the c-ares setup_once.h header, old file lib/setup_once.h has carried back from 2006 up to now days an alarming and prominent notice about the need of keeping libcurl's and c-ares's setup_once.h in sync. Given that this commit fixes the circular interdependency, the need and presence of mentioned notice is removed. All mentioned interdependencies come back from now old days when the c-ares project lived inside a curl subdirectory. This commit removes last traces of such fact.
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#include "curl_setup.h"
#include <curl/curl.h>
#include "strdup.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
#ifndef HAVE_STRDUP
char *curlx_strdup(const char *str)
{
size_t len;
char *newstr;
if(!str)
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return (char *)NULL;
len = strlen(str);
if(len >= ((size_t)-1) / sizeof(char))
return (char *)NULL;
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newstr = malloc((len + 1)*sizeof(char));
if(!newstr)
return (char *)NULL;
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memcpy(newstr, str, (len + 1)*sizeof(char));
return newstr;
}
#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_saferealloc(ptr, size)
*
* Does a normal realloc(), but will free the data pointer if the realloc
* fails. If 'size' is 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;
}