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/* **************************** */
/* Memory management functions. */
/* **************************** */
/* Created by Kevin Locke (from numerous canonical examples). */
/* */
/* Adapted for use by smenu. */
/* */
/* 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. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#include "xmalloc.h"
/* The following rpl_* function are necessary for AIX which doesn't */
/* provide 'GNU compatible' allocation functions. */
/* Every call to malloc()/realloc() is then replaced by a call to */
/* rpl_malloc()/rpl_realloc() as defined in the GNU generated config.h. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
#ifdef malloc
#undef malloc
extern void * malloc(size_t);
void *
rpl_malloc(size_t size)
{
if (!size)
size++;
return malloc(size);
}
#undef realloc
extern void *
realloc(void *, size_t);
void *
rpl_realloc(void * ptr, size_t size)
{
if (!size)
size++;
return (ptr ? realloc(ptr, size) : malloc(size));
}
#endif
/* ================== */
/* Customized malloc. */
/* ================== */
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;
#ifdef HAVE_STRDUP
allocated = strdup(p);
if (allocated == NULL)
{
fprintf(stderr, "Error: Insufficient memory for strdup.\n");
exit(EXIT_FAILURE);
}
#else
allocated = xmalloc(strlen(p) + 1);
strcpy(allocated, p);
#endif
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;
#ifdef HAVE_STRNDUP
p = strndup(str, len);
if (p == NULL)
{
fprintf(stderr, "Error: Insufficient memory for strndup.\n");
exit(EXIT_FAILURE);
}
#else
p = memchr(str, '\0', len);
if (p)
len = p - str;
p = xmalloc(len + 1);
memcpy(p, str, len);
p[len] = '\0';
#endif
return p;
}
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