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/* *************************** */
/* Memory allocation functions */
/* *************************** */
/* Created by Kevin Locke (from numerous canonical examples) */
/* */
/* I hereby place this file in the public domain. It may be freely */
/* reproduced, distributed, used, modified, built upon, or otherwise */
/* employed by anyone for any purpose without restriction. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
/* ================= */
/* Customized malloc */
/* ================= */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "xmalloc.h"
void *
xmalloc(size_t size)
{
void * allocated;
size_t real_size;
real_size = (size > 0) ? size : 1;
allocated = malloc(real_size);
if (allocated == NULL)
{
fprintf(stderr,
"Error: Insufficient memory (attempt to malloc %lu bytes)\n",
(unsigned long int)size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* ================= */
/* Customized calloc */
/* ================= */
void *
xcalloc(size_t n, size_t size)
{
void * allocated;
n = (n > 0) ? n : 1;
size = (size > 0) ? size : 1;
allocated = calloc(n, size);
if (allocated == NULL)
{
fprintf(stderr,
"Error: Insufficient memory (attempt to calloc %lu bytes)\n",
(unsigned long int)size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* ================== */
/* Customized realloc */
/* ================== */
void *
xrealloc(void * p, size_t size)
{
void * allocated;
allocated = realloc(p, size);
if (allocated == NULL && size > 0)
{
fprintf(stderr,
"Error: Insufficient memory (attempt to xrealloc %lu bytes)\n",
(unsigned long int)size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* =================================== */
/* strdup implementation using xmalloc */
/* =================================== */
char *
xstrdup(const char * p)
{
char * allocated;
allocated = xmalloc(strlen(p) + 1);
strcpy(allocated, p);
return allocated;
}
/* ================================================== */
/* strndup implementation using xmalloc */
/* This version guarantees that there is a final '\0' */
/* ================================================== */
char *
xstrndup(const char * str, size_t len)
{
char * p;
p = memchr(str, '\0', len);
if (p)
len = p - str;
p = xmalloc(len + 1);
memcpy(p, str, len);
p[len] = '\0';
return p;
}
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