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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. */
/* Displays an error message and exits gracefully if an error occurs. */
/* ================================================================== */
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 %zu bytes)\n",
size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* ================================================================== */
/* Customized calloc. */
/* Displays an error message and exits gracefully if an error occurs. */
/* ================================================================== */
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 %zu bytes)\n",
size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* ================================================================== */
/* Customized realloc. */
/* Displays an error message and exits gracefully if an error occurs. */
/* ================================================================== */
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 realloc %zu bytes)\n",
size);
exit(EXIT_FAILURE);
}
return allocated;
}
/* ================================================================== */
/* strdup implementation using xmalloc. */
/* Displays an error message and exits gracefully if an error occurs. */
/* ================================================================== */
char *
xstrdup(const char *str)
{
char *p;
p = malloc(strlen(str) + 1);
if (p == NULL)
{
fprintf(stderr, "Error: Insufficient memory for xstrdup.\n");
exit(EXIT_FAILURE);
}
strcpy(p, str);
return p;
}
/* ================================================================== */
/* strndup implementation using xmalloc. */
/* This version guarantees that there is a final '\0'. */
/* Displays an error message and exits gracefully if an error occurs. */
/* ================================================================== */
char *
xstrndup(const char *str, size_t len)
{
char *p;
p = memchr(str, '\0', len);
if (p != NULL)
len = p - str;
p = malloc(len + 1);
if (p == NULL)
{
fprintf(stderr, "Error: Insufficient memory for xstrndup.\n");
exit(EXIT_FAILURE);
}
memcpy(p, str, len);
p[len] = '\0';
return p;
}
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