qemu-malloc.c

   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 "trace.h"
  26 #include <stdlib.h>
  27
  28 void qemu_free(void *ptr)
  29 {
  30     trace_qemu_free(ptr);
  31     free(ptr);
  32 }
  33
  34 static int allow_zero_malloc(void)
  35 {
  36 #if defined(CONFIG_ZERO_MALLOC)
  37     return 1;
  38 #else
  39     return 0;
  40 #endif
  41 }
  42
  43 void *qemu_malloc(size_t size)
  44 {
  45     void *ptr;
  46     if (!size && !allow_zero_malloc()) {
  47         abort();
  48     }
  49     ptr = qemu_oom_check(malloc(size ? size : 1));
  50     trace_qemu_malloc(size, ptr);
  51     return ptr;
  52 }
  53
  54 void *qemu_realloc(void *ptr, size_t size)
  55 {
  56     void *newptr;
  57     if (!size && !allow_zero_malloc()) {
  58         abort();
  59     }
  60     newptr = qemu_oom_check(realloc(ptr, size ? size : 1));
  61     trace_qemu_realloc(ptr, size, newptr);
  62     return newptr;
  63 }
  64
  65 void *qemu_mallocz(size_t size)
  66 {
  67     void *ptr;
  68     if (!size && !allow_zero_malloc()) {
  69         abort();
  70     }
  71     ptr = qemu_oom_check(calloc(1, size ? size : 1));
  72     trace_qemu_malloc(size, ptr);
  73     return ptr;
  74 }
  75
  76 char *qemu_strdup(const char *str)
  77 {
  78     char *ptr;
  79     size_t len = strlen(str);
  80     ptr = qemu_malloc(len + 1);
  81     memcpy(ptr, str, len + 1);
  82     return ptr;
  83 }
  84
  85 char *qemu_strndup(const char *str, size_t size)
  86 {
  87     const char *end = memchr(str, 0, size);
  88     char *new;
  89
  90     if (end) {
  91         size = end - str;
  92     }
  93
  94     new = qemu_malloc(size + 1);
  95     new[size] = 0;
  96
  97     return memcpy(new, str, size);
  98 }