From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Fri, 1 May 2020 19:07:41 +0000 (-0500)
Subject: Starting file reading
X-Git-Url: https://git.brendanfh.com/?a=commitdiff_plain;h=fd83e9dcea12ce5a98d909694c4609c88a760b8c;p=onyx.git

Starting file reading
---

diff --git a/Makefile b/Makefile
index 86761a43..1df1e52e 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ OBJ_FILES=\
 CC=gcc
 INCLUDES=
 LIBS=
-FLGAS=-g
+FLAGS=-g
 
 %.o: %.c
 	$(CC) $(FLAGS) -c $< -o $@ $(INCLUDES)
diff --git a/onyx b/onyx
index e33fe9cd..e8adb764 100755
Binary files a/onyx and b/onyx differ
diff --git a/onyx.c b/onyx.c
index b028e3b1..59a7d703 100644
--- a/onyx.c
+++ b/onyx.c
@@ -1,9 +1,60 @@
-
 #include <stdio.h> // TODO: Replace with custom lib
 #include <stdlib.h> // TODO: Replace with custom lib
 
-int main() {
-	puts("Hello World!");
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+typedef struct File {
+	int fd;
+	int open : 1;
+	const char* path;
+} File;
+
+int file_open(File *f, const char* path, int flags) {
+	f->fd = open(path, flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
+
+	if (f->fd < 0)
+		return 1;
+
+	f->open = 1;
+	f->path = path;
+	return 0;
+}
+
+int file_close(File* f) {
+	if (close(f->fd) < 0) {
+		return errno;
+	}
+
+	f->open = 0;
+	return 0;
+}
+
+unsigned char file_read_byte(File* f) {
+	if (!f->open) return 0;
+
+	unsigned char byte;
+	read(f->fd, &byte, 1);
+	return byte;
+}
+
+int main(int argc, char *argv[]) {
+
+	if (argc < 2) {
+		fprintf(stderr, "Expected file to compile\n");
+		return -1;
+	}
+
+	File file;
+
+	if (!file_open(&file, argv[1], O_RDONLY)) {
+		fprintf(stderr, "Failed to open file: %s\n", argv[1]);
+		return -1;
+	}
+
+	file_close(&file);
 
 	return 0;
 }