Define stdbool macros

Macro 'bool', 'true', 'false' are defined in c.c. In addition, this
commit also tweaks 'define' preprocessor directive so that parsing
identifier after 'define' is possible.

Author: ChAoSUnItY

lib/c.c

@@ -9,6 +9,10 @@
 
 #define NULL 0
 
+#define bool _Bool
+#define true 1
+#define false 0
+
 #if defined(__arm__)
 #define __syscall_exit 1
 #define __syscall_read 3

src/main.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 
 /* Define target machine */
 #include "../config"

src/parser.c

@@ -380,14 +380,17 @@ int read_preproc_directive()
         char alias[MAX_VAR_LEN];
         char value[MAX_VAR_LEN];
 
-        lex_ident(T_identifier, alias);
+        lex_ident_internal(T_identifier, alias, 0);
 
         if (lex_peek(T_numeric, value)) {
             lex_expect(T_numeric);
             add_alias(alias, value);
         } else if (lex_peek(T_string, value)) {
             lex_expect(T_string);
             add_alias(alias, value);
+        } else if (lex_peek(T_identifier, value)) {
+            lex_expect(T_identifier);
+            add_alias(alias, value);
         } else if (lex_accept(T_open_bracket)) { /* function-like macro */
             macro_t *macro = add_macro(alias);