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/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "error_prints.h"
#include "macros.h"
#include "xmalloc.h"
static void
die_out_of_memory(void)
{
static int recursed;
if (recursed)
exit(1);
recursed = 1;
error_msg_and_die("Out of memory");
}
void *
xmalloc(size_t size)
{
void *p = malloc(size);
if (!p)
die_out_of_memory();
return p;
}
void *
xcalloc(size_t nmemb, size_t size)
{
void *p = calloc(nmemb, size);
if (!p)
die_out_of_memory();
return p;
}
#define HALF_SIZE_T (((size_t) 1) << (sizeof(size_t) * 4))
void *
xallocarray(size_t nmemb, size_t size)
{
size_t bytes = nmemb * size;
if ((nmemb | size) >= HALF_SIZE_T &&
size && bytes / size != nmemb)
die_out_of_memory();
void *p = malloc(bytes);
if (!p)
die_out_of_memory();
return p;
}
void *
xreallocarray(void *ptr, size_t nmemb, size_t size)
{
size_t bytes = nmemb * size;
if ((nmemb | size) >= HALF_SIZE_T &&
size && bytes / size != nmemb)
die_out_of_memory();
void *p = realloc(ptr, bytes);
if (!p)
die_out_of_memory();
return p;
}
void *
xgrowarray(void *const ptr, size_t *const nmemb, const size_t memb_size)
{
/* this is the same value as glibc DEFAULT_MXFAST */
enum { DEFAULT_ALLOC_SIZE = 64 * SIZEOF_LONG / 4 };
size_t grow_memb;
if (ptr == NULL)
grow_memb = *nmemb ? 0 :
ROUNDUP_DIV(DEFAULT_ALLOC_SIZE, memb_size);
else
grow_memb = (*nmemb >> 1) + 1;
if ((*nmemb + grow_memb) < *nmemb)
die_out_of_memory();
*nmemb += grow_memb;
return xreallocarray(ptr, *nmemb, memb_size);
}
char *
xstrdup(const char *str)
{
if (!str)
return NULL;
char *p = strdup(str);
if (!p)
die_out_of_memory();
return p;
}
char *
xstrndup(const char *str, size_t n)
{
char *p;
if (!str)
return NULL;
#ifdef HAVE_STRNDUP
p = strndup(str, n);
#else
p = xmalloc(n + 1);
#endif
if (!p)
die_out_of_memory();
#ifndef HAVE_STRNDUP
strncpy(p, str, n);
p[n] = '\0';
#endif
return p;
}
void *
xmemdup(const void *src, size_t size)
{
if (!src)
return NULL;
return memcpy(xmalloc(size), src, size);
}
void *
xarraydup(const void *src, size_t nmemb, size_t memb_size)
{
if (!src)
return NULL;
/* (nmemb * memb_size) checks are already done inside xallocarray */
return memcpy(xallocarray(nmemb, memb_size), src, nmemb * memb_size);
}
char *
xasprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
char *res;
if (vasprintf(&res, fmt, ap) < 0)
die_out_of_memory();
va_end(ap);
return res;
}
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