From c5364249b2600f25155f4c7ac206b3d6ca0e5b06 Mon Sep 17 00:00:00 2001
From: Teddy <ted.sybil@gmail.com>
Date: Mon, 12 Aug 2013 09:51:08 +0800
Subject: rectified a bug in `modulo`

---
 Makefile  |  2 +-
 main.cpp  | 46 +++++++++++++++++++++++++++++++++++++++++++---
 types.cpp |  2 +-
 3 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 45795d8..9b08a29 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ main: main.o parser.o builtin.o model.o eval.o exc.o consts.o types.o
 	g++ -o main $^ -pg -lgmp
 
 .cpp.o:
-	g++ $< -c -g -pg -DGMP_SUPPORT -Wall -O2
+	g++ $< -c -g -pg -DGMP_SUPPORT -Wall
 
 clean:
 	rm -f *.o
diff --git a/main.cpp b/main.cpp
index 221941d..28bd27d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,22 +5,62 @@
 #include "exc.h"
 #include <cstdio>
 
-int main() {
+int main(int argc, char **argv) {
     //freopen("in.scm", "r", stdin);
     Tokenizor *tk = new Tokenizor();
     ASTGenerator *ast = new ASTGenerator();
     Evaluator *eval = new Evaluator();
 
+    bool interactive = false;
+    bool preload = false;
+    char *fname;
+
     int rcnt = 0;
+    for (int i = 1; i < argc; i++)
+        if (strcmp(argv[i], "-i") == 0)
+            interactive = true;
+        else if (strcmp(argv[i], "-l") == 0 && i < argc - 1)
+        {
+            preload = true;
+            fname = argv[i + 1];
+        }
+
+    if (preload)
+    {
+        FILE *f = fopen(fname, "r");
+        if (!f)
+        {
+            printf("Can not open file: %s\n", fname);
+            return 0;
+        }
+        tk->set_stream(f);
+        while (1)
+        {
+            try
+            {
+                Pair *tree = ast->absorb(tk);
+                if (!tree) break;
+                eval->run_expr(tree)->ext_repr().c_str();
+            }
+            catch (GeneralError &e)
+            {
+                fprintf(stderr, "An error occured: %s\n", e.get_msg().c_str());
+            }
+        }
+        interactive = true;
+    }
+    tk->set_stream(stdin); 
     while (1)
     {
+        if (interactive)
         fprintf(stderr, "Sonsi> ");
         try
         {
             Pair *tree = ast->absorb(tk);
             if (!tree) break;
-            fprintf(stderr, "Ret> $%d = %s\n", rcnt++,
-                    eval->run_expr(tree)->ext_repr().c_str());
+            string output = eval->run_expr(tree)->ext_repr();
+            if (interactive)
+                fprintf(stderr, "Ret> $%d = %s\n", rcnt++, output.c_str());
         }
         catch (GeneralError &e)
         {
diff --git a/types.cpp b/types.cpp
index 8611cc6..de7ef66 100644
--- a/types.cpp
+++ b/types.cpp
@@ -892,7 +892,7 @@ NumObj *IntNumObj::mod(NumObj *_r) {
     const mpz_class &rval = static_cast<IntNumObj*>(_r)->val;
     if (rval == 0) throw NormalError(RUN_ERR_NUMERIC_OVERFLOW);
     mpz_class ret = val % rval;
-    if (sgn(ret) != sgn(rval))
+    if (ret != 0 && sgn(ret) != sgn(rval))
         ret = ret + rval;
     return new IntNumObj(ret);
 }
-- 
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