From d235876f94f84dca15520a20bb476b916b927afb Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sun, 30 Aug 2026 01:31:15 +0200
Subject: add: read files into memory

---
 src/io/file.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/io/file.h | 13 +++++++++++++
 src/main.c    | 10 ++++++----
 3 files changed, 80 insertions(+), 4 deletions(-)
 create mode 100644 src/io/file.c
 create mode 100644 src/io/file.h

diff --git a/src/io/file.c b/src/io/file.c
new file mode 100644
index 0000000..8ce8eef
--- /dev/null
+++ b/src/io/file.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "io/file.h"
+
+bool read_file(const char* path, struct File* out)
+{
+	FILE* stream = fopen(path, "rb");
+	if (stream == NULL)
+	{
+		fprintf(stderr, "error: could not open '%s'\n", path);
+		return false;
+	}
+
+	if (fseek(stream, 0, SEEK_END) != 0)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+
+	long length = ftell(stream);
+	if (length < 0)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+	rewind(stream);
+
+	size_t size = (size_t)length;
+	char* data = malloc(size + 1);
+	if (data == NULL)
+	{
+		fprintf(stderr, "error: out of memory reading '%s'\n", path);
+		fclose(stream);
+		return false;
+	}
+
+	if (fread(data, 1, size, stream) != size)
+	{
+		fprintf(stderr, "error: could not read '%s'\n", path);
+		free(data);
+		fclose(stream);
+		return false;
+	}
+
+	data[size] = '\0';
+	fclose(stream);
+
+	out->data = data;
+	out->size = size;
+	return true;
+}
+
+void free_file(struct File* file)
+{
+	free(file->data);
+	file->data = NULL;
+	file->size = 0;
+}
diff --git a/src/io/file.h b/src/io/file.h
new file mode 100644
index 0000000..7d15bd0
--- /dev/null
+++ b/src/io/file.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdbool.h>
+
+struct File
+{
+	char* data;
+	size_t size;
+};
+
+bool read_file(const char* path, struct File* out);
+void free_file(struct File* file);
diff --git a/src/main.c b/src/main.c
index a14d2ba..1d97acb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 
+#include "io/file.h"
 #include "cli/args.h"
 
 int main(int argc, char** argv)
@@ -12,11 +13,12 @@ int main(int argc, char** argv)
 	if (result == PARSE_ERROR)
 		return 1;
 
-	static const char* target_names[] = { "nasm", "fasm", "masm" };
+	struct File source;
+	if (!read_file(args.input_path, &source))
+		return 1;
 
-	printf("input:  %s\n", args.input_path);
-	printf("output: %s\n", args.output_path != NULL ? args.output_path : "<stdout>");
-	printf("target: %s\n", target_names[args.target]);
+	printf("read %zu bytes from %s\n", source.size, args.input_path);
 
+	free_file(&source);
 	return 0;
 }
-- 
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