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f1bcfa1122
Add a new ares_library_init_mem() initialization function for the library which allows the library user to specify their own malloc, realloc & free equivalents for use library-wide. Store these function pointers in library-wide global variables, defaulting to libc's malloc(), realloc() and free(). Change all calls to malloc, realloc and free to use the function pointer instead. Also ensure that ares_strdup() is always available (even if the local environment includes strdup(3)), and change the library code to always use it. Convert calls to calloc() to use ares_malloc() + memset
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "ares_setup.h"
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#include "ares_strdup.h"
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#include "ares.h"
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#include "ares_private.h"
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char *ares_strdup(const char *s1)
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{
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#ifdef HAVE_STRDUP
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if (ares_malloc == malloc)
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return strdup(s1);
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else
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#endif
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{
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size_t sz;
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char * s2;
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if(s1) {
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sz = strlen(s1);
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if(sz < (size_t)-1) {
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sz++;
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if(sz < ((size_t)-1) / sizeof(char)) {
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s2 = ares_malloc(sz * sizeof(char));
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if(s2) {
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memcpy(s2, s1, sz * sizeof(char));
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return s2;
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}
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}
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}
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}
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return (char *)NULL;
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}
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}
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