File:  [Qemu by Fabrice Bellard] / qemu / qemu-malloc.c
Revision 1.1.1.5 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:34:26 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1000, qemu0151, qemu0150, qemu0141, qemu0140, HEAD
qemu 0.14.0

    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 "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: }

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