from gnulib

1 files changed, 68 insertions, 0 deletions

diff --git a/lib/alloca_.h b/lib/alloca_.h
new file mode 100644
index 000000000..bb8e6a7a5
--- /dev/null
+++ b/lib/alloca_.h
@@ -0,0 +1,68 @@
+/* Memory allocation on the stack.
+   Copyright (C) 1995, 1999, 2001-2003 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.  */
+
+/* When this file is included, it may be preceded only by preprocessor
+   declarations.  Thanks to AIX.  Therefore we include it right after
+   "config.h", not later.  */
+
+#ifndef _ALLOCA_H
+# define _ALLOCA_H
+
+/* alloca(N) returns a pointer (void* or char*) to N bytes of memory
+   allocated on the stack, and which will last until the function returns.
+   Use of alloca should be avoided:
+     - inside arguments of function calls - undefined behaviour,
+     - in inline functions - the allocation may actually last until the
+       calling function returns,
+     - for huge N (say, N >= 65536) - you never know how large (or small)
+       the stack is, and when the stack cannot fulfill the memory allocation
+       request, the program just crashes.
+ */
+
+# ifdef __GNUC__
+#  ifndef alloca
+#   define alloca __builtin_alloca
+#  endif
+# else
+#  ifdef _MSC_VER
+#   include <malloc.h>
+#   define alloca _alloca
+#  else
+#   if HAVE_ALLOCA_H
+#    include <alloca.h>
+#   else
+#    ifdef _AIX
+ #    pragma alloca
+#    else
+#     ifdef __hpux /* This section must match that of bison generated files. */
+#      ifdef __cplusplus
+extern "C" void *alloca (unsigned int);
+#      else /* not __cplusplus */
+extern void *alloca ();
+#      endif /* not __cplusplus */
+#     else /* not __hpux */
+#      ifndef alloca
+extern char *alloca ();
+#      endif
+#     endif /* __hpux */
+#    endif
+#   endif
+#  endif
+# endif
+
+#endif /* _ALLOCA_H */