added example && changed flags

Makefile

@@ -8,7 +8,7 @@ hbas: hbas.c
 	${CC} ${CFLAGS} ${CFLAGS_EXTRA} hbas.c -o hbas
 
 example: hbas example.S
-	./hbas --bin < example.S > example
+	./hbas < example.S > example
 	xxd example
 
 clean:

README.md

@@ -0,0 +1,15 @@
+# Holey-bytes VM playground
+
+This is my take on holey bytes toolchain, currently only an assembler written in C.
+
+## Building
+
+Run `make`, or `make CC=<your preferred C compiler> CFLAGS_EXTRA=<more flags>`
+
+## Usage
+
+To run the assembler, feed the input file to stdin, and the output will be in stdout.
+```
+./hbas --hex < input.S > output.hex
+./hbas < input.S > output.bin
+```

hbas.c

@@ -821,9 +821,9 @@ AsmError assemble(InstHt ht, char *input, size_t len, ByteVec *out, EInfo *einfo
 }
 
 int main(int argc, char **argv) {
-    int binout = 0;
+    int hex_out = 0;
-    if (argc >= 2 && strcmp(argv[1], "--bin") == 0) {
+    if (argc >= 2 && strcmp(argv[1], "--hex") == 0) {
-        binout = 1;
+        hex_out = 1;
     }
 
     int err = 0;
@@ -854,10 +854,10 @@ int main(int argc, char **argv) {
         fprintf(stderr, "\n");
         goto done;
     }
-    if (binout) {
+    if (hex_out) {
-        fwrite(out.buf, 1, out.len, stdout);
-    } else {
         hd(out.buf, out.len);
+    } else {
+        fwrite(out.buf, 1, out.len, stdout);
     }
 
     done: