commands/flex-2.5.4/MISC/Macintosh/xmalloc.c

   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 }