1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, 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 #ifdef WIN32
28 #include <wchar.h>
29 #endif
30
31 #include "strdup.h"
32 #include "curl_memory.h"
33
34 /* The last #include file should be: */
35 #include "memdebug.h"
36
37 #ifndef HAVE_STRDUP
curlx_strdup(const char * str)38 char *curlx_strdup(const char *str)
39 {
40 size_t len;
41 char *newstr;
42
43 if(!str)
44 return (char *)NULL;
45
46 len = strlen(str) + 1;
47
48 newstr = malloc(len);
49 if(!newstr)
50 return (char *)NULL;
51
52 memcpy(newstr, str, len);
53 return newstr;
54 }
55 #endif
56
57 #ifdef WIN32
58 /***************************************************************************
59 *
60 * Curl_wcsdup(source)
61 *
62 * Copies the 'source' wchar string to a newly allocated buffer (that is
63 * returned).
64 *
65 * Returns the new pointer or NULL on failure.
66 *
67 ***************************************************************************/
Curl_wcsdup(const wchar_t * src)68 wchar_t *Curl_wcsdup(const wchar_t *src)
69 {
70 size_t length = wcslen(src);
71
72 if(length > (SIZE_T_MAX / sizeof(wchar_t)) - 1)
73 return (wchar_t *)NULL; /* integer overflow */
74
75 return (wchar_t *)Curl_memdup(src, (length + 1) * sizeof(wchar_t));
76 }
77 #endif
78
79 /***************************************************************************
80 *
81 * Curl_memdup(source, length)
82 *
83 * Copies the 'source' data to a newly allocated buffer (that is
84 * returned). Copies 'length' bytes.
85 *
86 * Returns the new pointer or NULL on failure.
87 *
88 ***************************************************************************/
Curl_memdup(const void * src,size_t length)89 void *Curl_memdup(const void *src, size_t length)
90 {
91 void *buffer = malloc(length);
92 if(!buffer)
93 return NULL; /* fail */
94
95 memcpy(buffer, src, length);
96
97 return buffer;
98 }
99
100 /***************************************************************************
101 *
102 * Curl_saferealloc(ptr, size)
103 *
104 * Does a normal realloc(), but will free the data pointer if the realloc
105 * fails. If 'size' is non-zero, it will free the data and return a failure.
106 *
107 * This convenience function is provided and used to help us avoid a common
108 * mistake pattern when we could pass in a zero, catch the NULL return and end
109 * up free'ing the memory twice.
110 *
111 * Returns the new pointer or NULL on failure.
112 *
113 ***************************************************************************/
Curl_saferealloc(void * ptr,size_t size)114 void *Curl_saferealloc(void *ptr, size_t size)
115 {
116 void *datap = realloc(ptr, size);
117 if(size && !datap)
118 /* only free 'ptr' if size was non-zero */
119 free(ptr);
120 return datap;
121 }
122