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/* xmalloc.c -- malloc with out of memory checking 
   Copyright (C) 1990, 1991 Free Software Foundation, Inc. 
 
   This program is free software; you can redistribute it and/or modify 
   it under the terms of the GNU General Public License as published by 
   the Free Software Foundation; either version 2, or (at your option) 
   any later version. 
 
   This program is distributed in the hope that it will be useful, 
   but WITHOUT ANY WARRANTY; without even the implied warranty of 
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
   GNU General Public License for more details. 
 
   You should have received a copy of the GNU General Public License 
   along with this program; if not, write to the Free Software 
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */ 
 
#if STDC_HEADERS || THINK_C 
#include  
#else 
char *malloc (); 
char *realloc (); 
void free (); 
#endif 
 
#ifdef THINK_C 
#define error(x, y, z) perror(z) /* Throw out meaningless arguments */ 
#else 
void error (); 
#endif 
 
/* Allocate N bytes of memory dynamically, with error checking.  */ 
 
char * 
xmalloc (n) 
     unsigned n; 
{ 
  char *p; 
 
  p = malloc (n); 
  if (p == 0) 
    /* Must exit with 2 for `cmp'.  */ 
    error (2, 0, "virtual memory exhausted"); 
  return p; 
} 
 
/* Change the size of an allocated block of memory P to N bytes, 
   with error checking. 
   If P is NULL, run xmalloc. 
   If N is 0, run free and return NULL.  */ 
 
char * 
xrealloc (p, n) 
     char *p; 
     unsigned n; 
{ 
  if (p == 0) 
    return xmalloc (n); 
  if (n == 0) 
    { 
      free (p); 
      return 0; 
    } 
  p = realloc (p, n); 
  if (p == 0) 
    /* Must exit with 2 for `cmp'.  */ 
    error (2, 0, "virtual memory exhausted"); 
  return p; 
}