From 6a91f64fceb12d43ccd6fdfeb1a4a8b753f3e482 Mon Sep 17 00:00:00 2001
From: Maxwell Jeffress <maxwelljeffress@proton.me>
Date: Thu, 16 Jul 2026 12:42:27 +1000
Subject: [PATCH] assembler stub

---
 src/assembler/assemble.c |  9 ++++++
 src/assembler/assemble.h |  3 ++
 src/assembler/main.c     | 60 ++++++++++++++++++++++++++++++++++++++++
 src/instruction.h        |  2 +-
 4 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 src/assembler/assemble.c
 create mode 100644 src/assembler/assemble.h
 create mode 100644 src/assembler/main.c

diff --git a/src/assembler/assemble.c b/src/assembler/assemble.c
new file mode 100644
index 0000000..99d58e5
--- /dev/null
+++ b/src/assembler/assemble.c
@@ -0,0 +1,9 @@
+#include "assemble.h"
+
+#include <stdlib.h>
+
+#include "../instruction.h"
+
+void assemble(const char* input, const char* outputFileName) {
+
+}
diff --git a/src/assembler/assemble.h b/src/assembler/assemble.h
new file mode 100644
index 0000000..cee9c2a
--- /dev/null
+++ b/src/assembler/assemble.h
@@ -0,0 +1,3 @@
+#pragma once
+
+void assemble(const char* input, const char* outputFileName);
diff --git a/src/assembler/main.c b/src/assembler/main.c
new file mode 100644
index 0000000..d27e447
--- /dev/null
+++ b/src/assembler/main.c
@@ -0,0 +1,60 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "assemble.h"
+
+char* getFileContents(const char* filename) {
+    // https://stackoverflow.com/questions/3747086/reading-the-whole-text-file-into-a-char-array-in-c
+    FILE* fp;
+    long lSize;
+    char* file;
+
+    fp = fopen(filename, "rb");
+    if (!fp) {
+        perror(filename);
+        exit(1);
+    }
+
+    fseek(fp, 0L, SEEK_END);
+    lSize = ftell(fp);
+    rewind(fp);
+
+    file = calloc(1, lSize + 1);
+    if (!file) {
+        fclose(fp);
+        fprintf(stderr, "memory allocation fail when reading file %s\n", filename);
+        exit(1);
+    }
+
+    if (1!=fread(file, lSize, 1, fp)) {
+        fclose(fp);
+        free(file);
+        fputs("couldn't read entire file", stderr);
+        exit(1);
+    }
+
+    // we done
+    fclose(fp);
+
+    return file;
+}
+
+int main(int argc, char** argv) {
+    if (argc < 2) {
+        printf("Usage: %s\n <input file> [output file]\n", argv[0]);
+        return 1;
+    }
+    char* outputName = "out.bin";
+    if (argc >= 3) {
+        outputName = argv[2];
+    }
+
+    char* asmContents = getFileContents(argv[1]);
+    if (asmContents == NULL) {
+        printf("couldn't read file %s\n", argv[1]);
+        return 1;
+    }
+
+    // TODO: implement
+    assemble(asmContents, outputName);
+}
diff --git a/src/instruction.h b/src/instruction.h
index f49e7e1..4e9e5f0 100644
--- a/src/instruction.h
+++ b/src/instruction.h
@@ -32,7 +32,7 @@ typedef uint16_t SerializedInst;
 
 typedef struct {
     InstructionOpcode opcode;
-    uint8_t operands[3];
+    Register operands[3];
     uint16_t immediate; // unused for almost all instructions
     bool hasImm16;
 } Instruction;