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 21 char *malloc (); 22 char *realloc (); 23 void free (); 24 #endif 25 26 #ifdef THINK_C 27 #define error(x, y, z) perror(z) /* Throw out meaningless arguments */ 28 #else 29 void error (); 30 #endif 31 32 /* Allocate N bytes of memory dynamically, with error checking. */ 33 34 char * 35 xmalloc (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 52 char * 53 xrealloc (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
