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      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 
     27 static void *oom_check(void *ptr)
     28 {
     29     if (ptr == NULL) {
     30         abort();
     31     }
     32     return ptr;
     33 }
     34 
     35 void *get_mmap_addr(unsigned long size)
     36 {
     37     return NULL;
     38 }
     39 
     40 void qemu_free(void *ptr)
     41 {
     42     free(ptr);
     43 }
     44 
     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 
     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 
     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 
     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 
     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 
     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