1/* xmalloc.c -- malloc with out of memory checking 2 Copyright (C) 1990, 1991 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 17 18#if STDC_HEADERS || THINK_C 19#include <stdlib.h> 20#else 21char *malloc (); 22char *realloc (); 23void free (); 24#endif 25 26#ifdef THINK_C 27#define error(x, y, z) perror(z) /* Throw out meaningless arguments */ 28#else 29void error (); 30#endif 31 32/* Allocate N bytes of memory dynamically, with error checking. */ 33 34char * 35xmalloc (n) 36 unsigned n; 37{ 38 char *p; 39 40 p = malloc (n); 41 if (p == 0) 42 /* Must exit with 2 for `cmp'. */ 43 error (2, 0, "virtual memory exhausted"); 44 return p; 45} 46 47/* Change the size of an allocated block of memory P to N bytes, 48 with error checking. 49 If P is NULL, run xmalloc. 50 If N is 0, run free and return NULL. */ 51 52char * 53xrealloc (p, n) 54 char *p; 55 unsigned n; 56{ 57 if (p == 0) 58 return xmalloc (n); 59 if (n == 0) 60 { 61 free (p); 62 return 0; 63 } 64 p = realloc (p, n); 65 if (p == 0) 66 /* Must exit with 2 for `cmp'. */ 67 error (2, 0, "virtual memory exhausted"); 68 return p; 69} 70