Implemented dummy functionality

src/cpp.c

@@ -6,6 +6,33 @@
 #include <stdio.h>
 
 
+/* cpp */
+static int _cpp_error(char const * message, int ret);
+static int _cpp(char const * filename)
+{
+	FILE * fp;
+	char buf[BUFSIZ];
+	size_t len;
+	int ret = 0;
+
+	if((fp = fopen(filename, "r")) == NULL)
+		return _cpp_error(filename, 1);
+	while((len = fread(buf, sizeof(char), sizeof(buf), fp)) > 0)
+		fwrite(buf, sizeof(char), len, stdout);
+	if(len == 0 && !feof(fp))
+		ret = _cpp_error(filename, 1);
+	fclose(fp);
+	return ret;
+}
+
+static int _cpp_error(char const * message, int ret)
+{
+	fprintf(stderr, "%s", "cpp: ");
+	perror(message);
+	return ret;
+}
+
+
 /* usage */
 static int _usage(void)
 {
@@ -25,5 +52,7 @@ int main(int argc, char * argv[])
 			default:
 				return _usage();
 		}
-	return 2;
+	if(argc - optind != 1)
+		return _usage();
+	return _cpp(argv[optind]) == 0 ? 0 : 2;
 }