From 0f1adf5570b17da28577152e26e743e4e031d640 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 17 Nov 2007 23:07:53 +0100
Subject: [PATCH] Added a filter for weeding out comments.

---
 judge/Makefile     |  5 +++--
 judge/filter-cmt.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 judge/filter-cmt.c

diff --git a/judge/Makefile b/judge/Makefile
index b140d68..e231fc2 100644
--- a/judge/Makefile
+++ b/judge/Makefile
@@ -2,16 +2,17 @@ CC=gcc-4.1.1
 CFLAGS=-O2 -Wall -W -Wno-parentheses -Wstrict-prototypes -Wmissing-prototypes -Wundef -Wredundant-decls -Winline $(DEBUG) -std=gnu99
 CFLAGS+=-Wno-pointer-sign -Wdisabled-optimization -Wno-missing-field-initializers
 
-all: test-io test-tok judge-tok
+all: test-io test-tok judge-tok filter-cmt
 
 JLIB=utils.o io.o token.o
 
 test-io: test-io.o $(JLIB)
 test-tok: test-tok.o $(JLIB)
 judge-tok: judge-tok.o $(JLIB)
+filter-cmt: filter-cmt.o $(JLIB)
 
 clean::
 	rm -f `find . -name "*~" -or -name "*.[oa]" -or -name "\#*\#" -or -name TAGS -or -name core`
-	rm -f test-io test-tok judge-tok
+	rm -f test-io test-tok judge-tok filter-cmt
 
 .PHONY: all clean distclean
diff --git a/judge/filter-cmt.c b/judge/filter-cmt.c
new file mode 100644
index 0000000..12978ad
--- /dev/null
+++ b/judge/filter-cmt.c
@@ -0,0 +1,44 @@
+/*
+ *	A filter removing C++-style comments
+ *
+ *	(c) 2007 Martin Mares <mj@ucw.cz>
+ */
+
+#include "judge.h"
+
+int main(void)
+{
+  struct stream *i = sopen_fd("stdin", 0);
+  struct stream *o = sopen_fd("stdout", 1);
+
+  int c, d, nl = 1;
+  c = sgetc(i);
+  for (;;)
+    {
+      if (c == '/')
+	{
+	  if ((d = sgetc(i)) == '/')
+	    {
+	      // skipping a comment...
+	      while ((c = sgetc(i)) >= 0 && c != '\n')
+		;
+	      if (nl)
+		continue;
+	    }
+	  else
+	    {
+	      sputc(o, c);
+	      c = d;
+	    }
+	}
+      if (c < 0)
+	break;
+      sputc(o, c);
+      nl = (c == '\n');
+      c = sgetc(i);
+    }
+
+  sclose(o);
+  sclose(i);
+  return 0;
+}
-- 
2.39.2