xref: /third_party/curl/lib/strdup.c (revision 13498266) 
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
40char *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 ***************************************************************************/
70wchar_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 ***************************************************************************/
91void *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 ***************************************************************************/
112void *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 ***************************************************************************/
136void *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