contrib/readline-5.0/xmalloc.c

   1 /* xmalloc.c -- safe versions of malloc and realloc */
   2
   3 /* Copyright (C) 1991 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Readline, a library for reading lines
   6    of text with interactive input and history editing.
   7
   8    Readline is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by the
  10    Free Software Foundation; either version 2, or (at your option) any
  11    later version.
  12
  13    Readline is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Readline; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  21 #define READLINE_LIBRARY
  22
  23 #if defined (HAVE_CONFIG_H)
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28
  29 #if defined (HAVE_STDLIB_H)
  30 #  include <stdlib.h>
  31 #else
  32 #  include "ansi_stdlib.h"
  33 #endif /* HAVE_STDLIB_H */
  34
  35 #include "xmalloc.h"
  36
  37 /* **************************************************************** */
  38 /*                                                                  */
  39 /*                 Memory Allocation and Deallocation.              */
  40 /*                                                                  */
  41 /* **************************************************************** */
  42
  43 static void
  44 memory_error_and_abort (fname)
  45      char *fname;
  46 {
  47   fprintf (stderr, "%s: out of virtual memory\n", fname);
  48   exit (2);
  49 }
  50
  51 /* Return a pointer to free()able block of memory large enough
  52    to hold BYTES number of bytes.  If the memory cannot be allocated,
  53    print an error message and abort. */
  54 PTR_T
  55 xmalloc (bytes)
  56      size_t bytes;
  57 {
  58   PTR_T temp;
  59
  60   temp = malloc (bytes);
  61   if (temp == 0)
  62     memory_error_and_abort ("xmalloc");
  63   return (temp);
  64 }
  65
  66 PTR_T
  67 xrealloc (pointer, bytes)
  68      PTR_T pointer;
  69      size_t bytes;
  70 {
  71   PTR_T temp;
  72
  73   temp = pointer ? realloc (pointer, bytes) : malloc (bytes);
  74
  75   if (temp == 0)
  76     memory_error_and_abort ("xrealloc");
  77   return (temp);
  78 }
  79
  80 /* Use this as the function to call when adding unwind protects so we
  81    don't need to know what free() returns. */
  82 void
  83 xfree (string)
  84      PTR_T string;
  85 {
  86   if (string)
  87     free (string);
  88 }