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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.haxx.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  ***************************************************************************/
     22 
     23 #include "curl_setup.h"
     24 
     25 #include <curl/curl.h>
     26 
     27 #include "strdup.h"
     28 #include "curl_memory.h"
     29 
     30 /* The last #include file should be: */
     31 #include "memdebug.h"
     32 
     33 #ifndef HAVE_STRDUP
     34 char *curlx_strdup(const char *str)
     35 {
     36   size_t len;
     37   char *newstr;
     38 
     39   if(!str)
     40     return (char *)NULL;
     41 
     42   len = strlen(str);
     43 
     44   if(len >= ((size_t)-1) / sizeof(char))
     45     return (char *)NULL;
     46 
     47   newstr = malloc((len + 1)*sizeof(char));
     48   if(!newstr)
     49     return (char *)NULL;
     50 
     51   memcpy(newstr, str, (len + 1)*sizeof(char));
     52 
     53   return newstr;
     54 
     55 }
     56 #endif
     57 
     58 /***************************************************************************
     59  *
     60  * Curl_memdup(source, length)
     61  *
     62  * Copies the 'source' data to a newly allocated buffer (that is
     63  * returned). Copies 'length' bytes.
     64  *
     65  * Returns the new pointer or NULL on failure.
     66  *
     67  ***************************************************************************/
     68 void *Curl_memdup(const void *src, size_t length)
     69 {
     70   void *buffer = malloc(length);
     71   if(!buffer)
     72     return NULL; /* fail */
     73 
     74   memcpy(buffer, src, length);
     75 
     76   return buffer;
     77 }
     78 
     79 /***************************************************************************
     80  *
     81  * Curl_saferealloc(ptr, size)
     82  *
     83  * Does a normal realloc(), but will free the data pointer if the realloc
     84  * fails. If 'size' is zero, it will free the data and return a failure.
     85  *
     86  * This convenience function is provided and used to help us avoid a common
     87  * mistake pattern when we could pass in a zero, catch the NULL return and end
     88  * up free'ing the memory twice.
     89  *
     90  * Returns the new pointer or NULL on failure.
     91  *
     92  ***************************************************************************/
     93 void *Curl_saferealloc(void *ptr, size_t size)
     94 {
     95   void *datap = realloc(ptr, size);
     96   if(size && !datap)
     97     /* only free 'ptr' if size was non-zero */
     98     free(ptr);
     99   return datap;
    100 }
    101