Implement file opening

Makefile

@@ -9,10 +9,10 @@ CC=cc
 CFLAGS=-I$(IDIR) -Wall -Wextra -pedantic
 LIB=
 
-_DEPS=
+_DEPS=lib.h
 DEPS=$(patsubst %,$(IDIR)/%,$(_DEPS))
 
-_OBJ=$(NAME).o
+_OBJ=$(NAME).o lib.o
 OBJ=$(patsubst %,$(ODIR)/%,$(_OBJ))
 
 

compile_flags.txt

@@ -0,0 +1 @@
+-Iinclude

include/lib.h

@@ -0,0 +1,4 @@
+#ifndef LIB_H
+#define LIB_H
+void die(const char *message);
+#endif

src/lib.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void die(const char *message) {
+  perror(message);
+  exit(1);
+}

src/main.c

@@ -1,3 +1,21 @@
-int main(void) {
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "lib.h"
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    printf("usage: catclone <FILE>\n");
+    die("args");
+  }
+
+  FILE *fp = fopen(argv[1], "r");
+
+  if (fp == NULL) {
+    die("fopen");
+  }
+
+  fclose(fp);
+
   return 0;
 }