nbase_memalloc.c

/***************************************************************************
 * nbase_memalloc.c -- A few simple functions related to memory            *
 * allocation.  Right now they are just safe_ versions of well known calls *
 * like malloc that quit if the allocation fails (so you don't have to     *
 * have a bunch of ugly checks in your code.  These were written by        *
 * fyodor@nmap.org .                                                   *
 *                                                                         *
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/* $Id$ */

#include "nbase.h"
#include <stdio.h>

NORETURN static void fatal(char *fmt, ...)
  __attribute__ ((format (printf, 1, 2)));

static void fatal(char *fmt, ...) {
  va_list ap;

  va_start(ap, fmt);
  fflush(stdout);
  vfprintf(stderr, fmt, ap);
  fprintf(stderr, "\nQUITTING!\n");
  va_end(ap);
  exit(1);
}

void *safe_malloc(size_t size) {
  void *mymem;

  if ((int)size < 0)            /* Catch caller errors */
    fatal("Tried to malloc negative amount of memory!!!");
  mymem = malloc(size);
  if (mymem == NULL)
    fatal("Malloc Failed! Probably out of space.");
  return mymem;
}

void *safe_realloc(void *ptr, size_t size) {
  void *mymem;

  if ((int)size < 0)            /* Catch caller errors */
    fatal("Tried to realloc negative amount of memory!!!");
  mymem = realloc(ptr, size);
  if (mymem == NULL)
    fatal("Realloc Failed! Probably out of space.");
  return mymem;
}

/* Zero-initializing version of safe_malloc */
void *safe_zalloc(size_t size) {
  void *mymem;

  if ((int)size < 0)
    fatal("Tried to malloc negative amount of memory!!!");
  mymem = calloc(1, size);
  if (mymem == NULL)
    fatal("Malloc Failed! Probably out of space.");
  return mymem;
}