1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "curl_setup.h"
26
27 #include <curl/curl.h>
28
29 #ifdef _WIN32
30 #include <wchar.h>
31 #endif
32
33 #include "strdup.h"
34 #include "curl_memory.h"
35
36 /* The last #include file should be: */
37 #include "memdebug.h"
38
39 #ifndef HAVE_STRDUP
Curl_strdup(const char * str)40 char *Curl_strdup(const char *str)
41 {
42 size_t len;
43 char *newstr;
44
45 if(!str)
46 return (char *)NULL;
47
48 len = strlen(str) + 1;
49
50 newstr = malloc(len);
51 if(!newstr)
52 return (char *)NULL;
53
54 memcpy(newstr, str, len);
55 return newstr;
56 }
57 #endif
58
59 #ifdef _WIN32
60 /***************************************************************************
61 *
62 * Curl_wcsdup(source)
63 *
64 * Copies the 'source' wchar string to a newly allocated buffer (that is
65 * returned).
66 *
67 * Returns the new pointer or NULL on failure.
68 *
69 ***************************************************************************/
Curl_wcsdup(const wchar_t * src)70 wchar_t *Curl_wcsdup(const wchar_t *src)
71 {
72 size_t length = wcslen(src);
73
74 if(length > (SIZE_T_MAX / sizeof(wchar_t)) - 1)
75 return (wchar_t *)NULL; /* integer overflow */
76
77 return (wchar_t *)Curl_memdup(src, (length + 1) * sizeof(wchar_t));
78 }
79 #endif
80
81 /***************************************************************************
82 *
83 * Curl_memdup(source, length)
84 *
85 * Copies the 'source' data to a newly allocated buffer (that is
86 * returned). Copies 'length' bytes.
87 *
88 * Returns the new pointer or NULL on failure.
89 *
90 ***************************************************************************/
Curl_memdup(const void * src,size_t length)91 void *Curl_memdup(const void *src, size_t length)
92 {
93 void *buffer = malloc(length);
94 if(!buffer)
95 return NULL; /* fail */
96
97 memcpy(buffer, src, length);
98
99 return buffer;
100 }
101
102 /***************************************************************************
103 *
104 * Curl_memdup0(source, length)
105 *
106 * Copies the 'source' string to a newly allocated buffer (that is returned).
107 * Copies 'length' bytes then adds a null terminator.
108 *
109 * Returns the new pointer or NULL on failure.
110 *
111 ***************************************************************************/
Curl_memdup0(const char * src,size_t length)112 void *Curl_memdup0(const char *src, size_t length)
113 {
114 char *buf = malloc(length + 1);
115 if(!buf)
116 return NULL;
117 memcpy(buf, src, length);
118 buf[length] = 0;
119 return buf;
120 }
121
122 /***************************************************************************
123 *
124 * Curl_saferealloc(ptr, size)
125 *
126 * Does a normal realloc(), but will free the data pointer if the realloc
127 * fails. If 'size' is non-zero, it will free the data and return a failure.
128 *
129 * This convenience function is provided and used to help us avoid a common
130 * mistake pattern when we could pass in a zero, catch the NULL return and end
131 * up free'ing the memory twice.
132 *
133 * Returns the new pointer or NULL on failure.
134 *
135 ***************************************************************************/
Curl_saferealloc(void * ptr,size_t size)136 void *Curl_saferealloc(void *ptr, size_t size)
137 {
138 void *datap = realloc(ptr, size);
139 if(size && !datap)
140 /* only free 'ptr' if size was non-zero */
141 free(ptr);
142 return datap;
143 }
144