rework usage a bit.

makefile

@@ -8,8 +8,8 @@ CC=gcc
 # CC=tcc # <= faster compilation
 
 # Main file
-SRC=wc.c
-OUT=wc
+SRC=ww.c
+OUT=ww
 
 ## Flags
 DEBUG= #'-g'
@@ -31,7 +31,7 @@ format: $(SRC)
 
 test: $(OUT)
 	/bin/echo -e "123\n45 67" | ./$(OUT)
-	/bin/echo -n "" | ./wc
+	/bin/echo -n "" | ./ww
 	/bin/echo "  xx x" | ./$(OUT) -w
 	./$(OUT) $(SRC)
 	./$(OUT) nonexistent_file || true

ww.c

@@ -31,9 +31,17 @@ int process_fn(int fn)
     return 0;
 }
 
+void usage(){
+        printf("Usage: ww file.txt\n");
+				printf("   or: cat file.txt | ww\n");
+}
+
 int main(int argc, char** argv)
 {
-    if (!isatty(STDIN_FILENO)) {
+    if(argc > 1 && argv[1][0] == '-' && argv[1][1] == 'h'){
+			usage();
+			return 0;
+		} else if (!isatty(STDIN_FILENO)) {
         return process_fn(STDIN_FILENO);
     } else if (argc > 1) {
         FILE* fp = fopen(argv[1], "r");
@@ -43,8 +51,7 @@ int main(int argc, char** argv)
         }
         return process_fn(fileno(fp));
     } else {
-        printf("Usage: ww file.txt\n");
-				printf("   or: cat file.txt | ww\n");
+			usage();
     }
     return 0;
 }