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-rw-r--r--include/libc-internal.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/libc-internal.h b/include/libc-internal.h
index 2e372267f..6cd4feb53 100644
--- a/include/libc-internal.h
+++ b/include/libc-internal.h
@@ -322,6 +322,36 @@ extern int __sprintf (char *__restrict __s,
#define fopen64 __fopen64
#endif
+/* #include <alloca.h> */
+#include <bits/stackinfo.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
+# warning unknown stack
+# define extend_alloca(buf, len, newlen) \
+ alloca (((len) = (newlen)))
+#endif
+
/* #include <stdlib.h> */
extern char *__getenv (__const char *__name) attribute_hidden;
extern void __exit (int __status) __THROW __attribute__ ((__noreturn__)) attribute_hidden;