From 5dc6889265cb5f0c385778f075279ed8012023a0 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sun, 15 Aug 2021 16:05:11 +0000
Subject: added NULL and EOF (-1 as emum initialized in c4)

---
 miniany/c4.c                | 10 ++++++++--
 miniany/cc.c                | 16 ++++++++++++++--
 miniany/libc-freestanding.c |  7 +------
 miniany/test1.c             |  6 ++++++
 4 files changed, 29 insertions(+), 10 deletions(-)
 create mode 100644 miniany/test1.c

diff --git a/miniany/c4.c b/miniany/c4.c
index a6d24d3..a36fb4a 100644
--- a/miniany/c4.c
+++ b/miniany/c4.c
@@ -357,7 +357,7 @@ int main(int argc, char **argv)
 {
   int fd, bt, ty, poolsz, *idmain;
   int *pc, *sp, *bp, a, cycle; // vm registers
-  int i, *t; // temps
+  int i, *t, neg; // temps
 
   --argc; ++argv;
   if (argc > 0 && **argv == '-' && (*argv)[1] == 's') { src = 1; --argc; ++argv; }
@@ -377,13 +377,14 @@ int main(int argc, char **argv)
   memset(data, 0, poolsz);
 
   p = "char else enum if int return sizeof do while "
-      "EOF EXIT_SUCCESS EXIT_FAILURE "
+      "EOF EXIT_SUCCESS EXIT_FAILURE NULL "
       "open read close printf malloc free memset memcmp getchar putstring putnl putchar putint isspace isdigit isalnum isalpha strcmp exit void main";
   i = Char; while (i <= While) { next(); id[Tk] = i++; } // add keywords to symbol table
   // add library constants
   next(); id[Class] = Num; id[Type] = INT; id[Val] = -1;
   next(); id[Class] = Num; id[Type] = INT; id[Val] = 0;
   next(); id[Class] = Num; id[Type] = INT; id[Val] = 1;
+  next(); id[Class] = Num; id[Type] = INT; id[Val] = (int)NULL;
   i = OPEN; while (i <= EXIT) { next(); id[Class] = Sys; id[Type] = INT; id[Val] = i++; } // add library to symbol table
   next(); id[Tk] = Char; // handle void type
   next(); idmain = id; // keep track of main
@@ -411,8 +412,13 @@ int main(int argc, char **argv)
           next();
           if (tk == Assign) {
             next();
+            neg = 0;
+            if (tk == Sub) { next(); neg =1; }
             if (tk != Num) { printf("%d: bad enum initializer\n", line); return -1; }
             i = ival;
+            if (neg) {
+              i = -ival;
+            }
             next();
           }
           id[Class] = Num; id[Type] = INT; id[Val] = i++;
diff --git a/miniany/cc.c b/miniany/cc.c
index ebdebdb..e5b30c7 100644
--- a/miniany/cc.c
+++ b/miniany/cc.c
@@ -8,8 +8,7 @@ int token;
 int DEBUG_SCANNER;
 
 enum {
-	MAX_IDENT_LEN = 20,
-	TEST = -1
+	MAX_IDENT_LEN = 20
 };
 
 void pushBack( int c )
@@ -254,11 +253,23 @@ void parseExpression( )
 	}
 }
 
+//~ struct Symbol {
+	//~ char *name;
+//~ };
+
+//~ struct Symbol *symbol;
+
+void newSymbol( char *s )
+{
+	
+}
+
 void parseDeclaration( )
 {
 	expect( S_INT, "int" );	
 	expect( S_IDENT, "identifier" );
 	putstring( "Adding glob: " ); putstring( ident ); putnl( );
+	newSymbol( ident );
 	expect( S_SEMICOLON, ";" );
 }
 
@@ -287,6 +298,7 @@ int main( int argc, char **argv )
 	row = 1;
 	pushback = 0;
 	DEBUG_SCANNER = 1;
+	//~ symbol = NULL;
 	ident = "12345678901234567890";
 
 	token = getToken( );
diff --git a/miniany/libc-freestanding.c b/miniany/libc-freestanding.c
index ffed093..fdec615 100644
--- a/miniany/libc-freestanding.c
+++ b/miniany/libc-freestanding.c
@@ -65,13 +65,8 @@ enum {
 	SYSCALL_WRITE = 4
 };
 
-/* EOF = -1 is a const expression for c4 */
-/* EOF = 0xFFFFFFFF clang doesn't like this */
-/* EOF = 0xFFFFFFFF gcc overflow in conversion from 'enum <anonymous>' to 'int' changes value from '4294967295' to '-1' */
-/* EOF = 256, this is not standard, but doesn't really matter in freestanding mode,
- * code should really not relly on the fact what the value of EOF is (-1 usually) */
 enum {
-	EOF = 256
+	EOF = -1
 };
 
 int errno;
diff --git a/miniany/test1.c b/miniany/test1.c
new file mode 100644
index 0000000..ba8dd4f
--- /dev/null
+++ b/miniany/test1.c
@@ -0,0 +1,6 @@
+/* test1 */
+
+int i;
+int i;
+
+i = 12+25/5-2*3; // another comment
-- 
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