Import glibc-mainline for 2006-08-16

git-svn-id: svn://svn.eglibc.org/fsf/trunk@4 7b3dc134-2b1b-0410-93df-9e9f96275f8d

1 files changed, 49 insertions, 0 deletions

diff --git a/libc/include/alloca.h b/libc/include/alloca.h
new file mode 100644
index 000000000..563d7868b
--- /dev/null
+++ b/libc/include/alloca.h
@@ -0,0 +1,49 @@
+#ifndef _ALLOCA_H
+
+#include <stdlib/alloca.h>
+#include <stackinfo.h>
+
+#undef	__alloca
+
+/* Now define the internal interfaces.  */
+extern void *__alloca (size_t __size);
+
+#ifdef	__GNUC__
+# define __alloca(size)	__builtin_alloca (size)
+#endif /* GCC.  */
+
+extern int __libc_use_alloca (size_t size) __attribute__ ((const));
+extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const));
+
+#define __MAX_ALLOCA_CUTOFF	65536
+
+#include <allocalim.h>
+
+#if _STACK_GROWS_DOWN
+# define extend_alloca(buf, len, newlen) \
+  (__typeof (buf)) ({ size_t __newlen = (newlen);			      \
+		      char *__newbuf = __alloca (__newlen);		      \
+		      if (__newbuf + __newlen == (char *) buf)		      \
+			len += __newlen;				      \
+		      else						      \
+			len = __newlen;					      \
+		      __newbuf; })
+#elif _STACK_GROWS_UP
+# define extend_alloca(buf, len, newlen) \
+  (__typeof (buf)) ({ size_t __newlen = (newlen);			      \
+		      char *__newbuf = __alloca (__newlen);		      \
+		      char *__buf = (buf);				      \
+		      if (__buf + __newlen == __newbuf)			      \
+			{						      \
+			  len += __newlen;				      \
+			  __newbuf = __buf;				      \
+			}						      \
+		      else						      \
+			len = __newlen;					      \
+		      __newbuf; })
+#else
+# define extend_alloca(buf, len, newlen) \
+  __alloca (((len) = (newlen)))
+#endif
+
+#endif