1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2019, 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 |
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 | ***************************************************************************/ |
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 non-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 | ***************************************************************************/ |
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 | |