1 /*
2 * malloc-like functions for system emulation.
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu-common.h"
25 #include <stdlib.h>
26
oom_check(void * ptr)27 static void *oom_check(void *ptr)
28 {
29 if (ptr == NULL) {
30 abort();
31 }
32 return ptr;
33 }
34
get_mmap_addr(unsigned long size)35 void *get_mmap_addr(unsigned long size)
36 {
37 return NULL;
38 }
39
qemu_free(void * ptr)40 void qemu_free(void *ptr)
41 {
42 free(ptr);
43 }
44
allow_zero_malloc(void)45 static int allow_zero_malloc(void)
46 {
47 #if defined(CONFIG_ZERO_MALLOC)
48 return 1;
49 #else
50 return 0;
51 #endif
52 }
53
qemu_malloc(size_t size)54 void *qemu_malloc(size_t size)
55 {
56 if (!size && !allow_zero_malloc()) {
57 abort();
58 }
59 return oom_check(malloc(size ? size : 1));
60 }
61
qemu_realloc(void * ptr,size_t size)62 void *qemu_realloc(void *ptr, size_t size)
63 {
64 if (size) {
65 return oom_check(realloc(ptr, size));
66 } else if (allow_zero_malloc()) {
67 return oom_check(realloc(ptr, size ? size : 1));
68 }
69 abort();
70 }
71
qemu_mallocz(size_t size)72 void *qemu_mallocz(size_t size)
73 {
74 void *ptr;
75 ptr = qemu_malloc(size);
76 memset(ptr, 0, size);
77 return ptr;
78 }
79
qemu_strdup(const char * str)80 char *qemu_strdup(const char *str)
81 {
82 char *ptr;
83 size_t len = strlen(str);
84 ptr = qemu_malloc(len + 1);
85 memcpy(ptr, str, len + 1);
86 return ptr;
87 }
88
qemu_strndup(const char * str,size_t size)89 char *qemu_strndup(const char *str, size_t size)
90 {
91 const char *end = memchr(str, 0, size);
92 char *new;
93
94 if (end) {
95 size = end - str;
96 }
97
98 new = qemu_malloc(size + 1);
99 new[size] = 0;
100
101 return memcpy(new, str, size);
102 }
103