lib/malloc/xmalloc.c

   1 /* xmalloc.c -- safe versions of malloc and realloc */
   2
   3 /* Copyright (C) 1991-2003, 2022 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
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Readline is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #if defined (HAVE_CONFIG_H)
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #if defined (HAVE_STDLIB_H)
  29 #  include <stdlib.h>
  30 #else
  31 #  include "ansi_stdlib.h"
  32 #endif /* HAVE_STDLIB_H */
  33
  34 /* Generic pointer type. */
  35 #ifndef PTR_T
  36 #  define PTR_T void *
  37 #endif /* PTR_T */
  38
  39 /* **************************************************************** */
  40 /*                                                                  */
  41 /*                 Memory Allocation and Deallocation.              */
  42 /*                                                                  */
  43 /* **************************************************************** */
  44
  45 static void
  46 memory_error_and_abort (char *fname)
  47 {
  48   fprintf (stderr, "%s: out of virtual memory\n", fname);
  49   exit (2);
  50 }
  51
  52 /* Return a pointer to free()able block of memory large enough
  53    to hold BYTES number of bytes.  If the memory cannot be allocated,
  54    print an error message and abort. */
  55 PTR_T
  56 xmalloc (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 (PTR_T pointer, size_t bytes)
  68 {
  69   PTR_T temp;
  70
  71   temp = pointer ? realloc (pointer, bytes) : malloc (bytes);
  72
  73   if (temp == 0)
  74     memory_error_and_abort ("xrealloc");
  75   return (temp);
  76 }
  77
  78 void
  79 xfree (PTR_T string)
  80 {
  81   if (string)
  82     free (string);
  83 }