(fts_build): Comment out dead code.
[kopensolaris-gnu/glibc.git] / include / alloca.h
index 3a480f8..563d786 100644 (file)
@@ -1,6 +1,7 @@
 #ifndef _ALLOCA_H
 
 #include <stdlib/alloca.h>
+#include <stackinfo.h>
 
 #undef __alloca
 
@@ -11,4 +12,38 @@ extern void *__alloca (size_t __size);
 # 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