Move to here from xallocsa.h.

lib/xmalloca.h

@@ -0,0 +1,54 @@
+/* Safe automatic memory allocation with out of memory checking.
+   Copyright (C) 2003, 2005, 2007 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2003.
+
+   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
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _XMALLOCA_H
+#define _XMALLOCA_H
+
+#include "malloca.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* xmalloca(N) is a checking safe variant of alloca(N).  It allocates N bytes
+   of memory allocated on the stack, that must be freed using freesa() before
+   the function returns.  Upon failure, it exits with an error message.  */
+#if HAVE_ALLOCA
+# define xmalloca(N) \
+  ((N) < 4032 - sa_increment					    \
+   ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \
+   : xmmalloca (N))
+extern void * xmmalloca (size_t n);
+#else
+# define xmalloca(N) \
+  xmalloc (N)
+#endif
+
+/* Maybe we should also define a variant
+    xnmalloca (size_t n, size_t s) - behaves like xmalloca (n * s)
+   If this would be useful in your application. please speak up.  */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _XMALLOCA_H */