1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, 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.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) + 1;
43
44 newstr = malloc(len);
45 if(!newstr)
46 return (char *)NULL;
47
48 memcpy(newstr, str, len);
49 return newstr;
50 }
51 #endif
52
53 /***************************************************************************
54 *
55 * Curl_memdup(source, length)
56 *
57 * Copies the 'source' data to a newly allocated buffer (that is
58 * returned). Copies 'length' bytes.
59 *
60 * Returns the new pointer or NULL on failure.
61 *
62 ***************************************************************************/
Curl_memdup(const void * src,size_t length)63 void *Curl_memdup(const void *src, size_t length)
64 {
65 void *buffer = malloc(length);
66 if(!buffer)
67 return NULL; /* fail */
68
69 memcpy(buffer, src, length);
70
71 return buffer;
72 }
73
74 /***************************************************************************
75 *
76 * Curl_saferealloc(ptr, size)
77 *
78 * Does a normal realloc(), but will free the data pointer if the realloc
79 * fails. If 'size' is non-zero, it will free the data and return a failure.
80 *
81 * This convenience function is provided and used to help us avoid a common
82 * mistake pattern when we could pass in a zero, catch the NULL return and end
83 * up free'ing the memory twice.
84 *
85 * Returns the new pointer or NULL on failure.
86 *
87 ***************************************************************************/
Curl_saferealloc(void * ptr,size_t size)88 void *Curl_saferealloc(void *ptr, size_t size)
89 {
90 void *datap = realloc(ptr, size);
91 if(size && !datap)
92 /* only free 'ptr' if size was non-zero */
93 free(ptr);
94 return datap;
95 }
96