• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@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
curlx_strdup(const char * str)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  ***************************************************************************/
Curl_memdup(const void * src,size_t length)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  ***************************************************************************/
Curl_saferealloc(void * ptr,size_t size)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