Added stdarg.h

photon/libc/include/stdarg.h

@@ -0,0 +1,20 @@
+#ifndef STDARG_H
+#define STDARG_H
+
+//typedef struct __va_list_tag *va_list;
+typedef __builtin_va_list va_list;
+
+# if defined(__GNUC__) && __GNUC__ >= 3
+#define va_start(ap, arg) __builtin_va_start((ap), (arg))
+#define va_arg __builtin_va_arg
+#define va_copy __builtin_va_copy
+#define va_end(ap) __builtin_va_end((ap))
+#else
+#error Unsupported compiler
+#define va_start(ap, arg) ((ap) = ((va_list)&(arg)) + ((sizeof(long) > sizeof(arg)) ? sizeof(long) : sizeof(arg)))
+#define va_arg(ap, type) *(type *)(ap), ((ap) += ((sizeof(long) > sizeof(type)) ? sizeof(long) : sizeof(type)))
+#define va_copy(copy, arg) ((copy) = (arg))
+#define va_end(ap)
+#endif
+
+#endif