new file, from Paul Eggert

[gnulib.git] / lib / xmalloc.c

diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index bad831f..2f103d6 100644 (file)
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -1,5 +1,5 @@
 /* xmalloc.c -- malloc with out of memory checking
-   Copyright (C) 1990, 91, 92, 93, 94 Free Software Foundation, Inc.
+   Copyright (C) 1990-1999, 2000 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -12,92 +12,105 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#if __STDC__
-#define VOID void
-#else
-#define VOID char
+#if HAVE_CONFIG_H
+# include <config.h>
 #endif
 
 #include <sys/types.h>
 
 #if STDC_HEADERS
-#include <stdlib.h>
+# include <stdlib.h>
 #else
-VOID *malloc ();
-VOID *realloc ();
+void *calloc ();
+void *malloc ();
+void *realloc ();
 void free ();
 #endif
 
-/* This is for other GNU distributions with internationalized messages.
-   The GNU C Library itself does not yet support such messages.  */
-#if HAVE_LIBINTL_H
+#if ENABLE_NLS
 # include <libintl.h>
+# define _(Text) gettext (Text)
 #else
-# define gettext(msgid) (msgid)
+# define textdomain(Domain)
+# define _(Text) Text
 #endif
+#define N_(Text) Text
+
+#include "error.h"
+#include "xalloc.h"
 
 #ifndef EXIT_FAILURE
-#define EXIT_FAILURE 1
+# define EXIT_FAILURE 1
+#endif
+
+#ifndef HAVE_DONE_WORKING_MALLOC_CHECK
+"you must run the autoconf test for a properly working malloc -- see malloc.m4"
+#endif
+
+#ifndef HAVE_DONE_WORKING_REALLOC_CHECK
+"you must run the autoconf test for a properly working realloc --see realloc.m4"
 #endif
 
 /* Exit value when the requested amount of memory is not available.
    The caller may set it to some other value.  */
-int xmalloc_exit_failure = EXIT_FAILURE;
+int xalloc_exit_failure = EXIT_FAILURE;
 
-#if __STDC__ && (HAVE_VPRINTF || HAVE_DOPRNT)
-void error (int, int, const char *, ...);
-#else
-void error ();
-#endif
+/* If non NULL, call this function when memory is exhausted. */
+void (*xalloc_fail_func) PARAMS ((void)) = 0;
 
-static VOID *
-fixup_null_alloc (n)
-     size_t n;
-{
-  VOID *p;
+/* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
+   before exiting when memory is exhausted.  Goes through gettext. */
+char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");
 
-  p = 0;
-  if (n == 0)
-    p = malloc ((size_t) 1);
-  if (p == 0)
-    error (xmalloc_exit_failure, 0, gettext ("Memory exhausted"));
-  return p;
+void
+xalloc_die (void)
+{
+  if (xalloc_fail_func)
+    (*xalloc_fail_func) ();
+  error (xalloc_exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
+  /* The `noreturn' cannot be given to error, since it may return if
+     its first argument is 0.  To help compilers understand the
+     xalloc_die does terminate, call exit. */
+  exit (EXIT_FAILURE);
 }
 
 /* Allocate N bytes of memory dynamically, with error checking.  */
 
-VOID *
-xmalloc (n)
-     size_t n;
+void *
+xmalloc (size_t n)
 {
-  VOID *p;
+  void *p;
 
   p = malloc (n);
   if (p == 0)
-    p = fixup_null_alloc (n);
+    xalloc_die ();
   return p;
 }
 
 /* Change the size of an allocated block of memory P to N bytes,
-   with error checking.
-   If P is NULL, run xmalloc.  */
+   with error checking.  */
 
-VOID *
-xrealloc (p, n)
-     VOID *p;
-     size_t n;
+void *
+xrealloc (void *p, size_t n)
 {
-  if (p == 0)
-    return xmalloc (n);
   p = realloc (p, n);
   if (p == 0)
-    p = fixup_null_alloc (n);
+    xalloc_die ();
+  return p;
+}
+
+/* Allocate memory for N elements of S bytes, with error checking.  */
+
+void *
+xcalloc (size_t n, size_t s)
+{
+  void *p;
+
+  p = calloc (n, s);
+  if (p == 0)
+    xalloc_die ();
   return p;
 }