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