File:  [Qemu by Fabrice Bellard] / qemu / qemu-malloc.c
Revision 1.1.1.3 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:35:00 2018 UTC (2 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, HEAD
qemu 0.12.0

    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: }

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