Include files modified for compatibility with SmallerC.

Fixed bug in C preprocessor: buffer size reduced to avoid allocation failure.
Added option -v for smlrc.
New example stdarg.c: a demo of function with variable arguments.

include/stdarg.h

@@ -4,32 +4,49 @@
 #ifndef _STDARG_H
 #define _STDARG_H
 
-/* Define __gnuc_va_list.  */
+/*
+ * Define va_start, va_arg, va_end, va_copy.
+ */
+#if defined(__GNUC__)           /* Gnu C */
+# define va_start(ap, last)	__builtin_va_start((ap), last)
+# define va_arg(ap, type)       __builtin_va_arg((ap), type)
+# define va_end(ap)             __builtin_va_end((ap))
+# define va_copy(dest, src)     __builtin_va_copy((dest), (src))
 
+#elif defined(__PCC__)          /* PCC */
+# define va_start(ap, last)     __builtin_stdarg_start((ap), last)
+# define va_arg(ap, type)       __builtin_va_arg((ap), type)
+# define va_end(ap)             __builtin_va_end((ap))
+# define va_copy(dest, src)     __builtin_va_copy((dest), (src))
 
-#ifdef __GNUC__
-#   ifndef __GNUC_VA_LIST
-#       define __GNUC_VA_LIST
-        typedef __builtin_va_list __gnuc_va_list;
-#   endif
-#   define va_start(ap, last)	__builtin_va_start((ap), last)
+#else                           /* SmallerC, LCC */
+# define va_start(ap, last)     (ap = ((char*)&(last) + \
+        (((sizeof(last) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))))
+# define va_arg(ap, type)       ((type*)(ap += \
+        sizeof(type) == sizeof(int) ? sizeof(type) : \
+        (-(int)(ap) & (sizeof(type) - 1)) + sizeof(type)))[-1]
+# define va_end(ap)
+# define va_copy(dest, src)     (dest = (src))
 #endif
-#ifdef __PCC__
-#   define va_start(ap, last)   __builtin_stdarg_start((ap), last)
-#endif
-#define va_arg(ap, type)        __builtin_va_arg((ap), type)
-#define va_end(ap)              __builtin_va_end((ap))
-#define va_copy(dest, src)      __builtin_va_copy((dest), (src))
-
 
+/*
+ * Define va_list.
+ */
 #ifndef _VA_LIST_T
-#define _VA_LIST_T
-#ifdef __GNUC__
+# define _VA_LIST_T
+# if defined(__GNUC__) || defined(__PCC__)
     typedef __builtin_va_list va_list;
+# else
+    typedef char *va_list;
+# endif
 #endif
-#ifdef __SMALLER_C__
-    typedef int *va_list;
-#endif
+
+/*
+ * Define __gnuc_va_list.
+ */
+#if defined(__GNUC__) && !defined(__GNUC_VA_LIST)
+# define __GNUC_VA_LIST
+    typedef __builtin_va_list __gnuc_va_list;
 #endif
 
 #endif /* not _STDARG_H */