Copying 8 bytes

Topic-1/main.c

@@ -1,6 +1,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 8
 
 enum ERROR{NO_ARGUMENTS, WRONG_ARGUMENT};
 
@@ -22,8 +26,22 @@ int print_help() {
 }
 
 int cp(char *argv[]){
-    printf("%s\n", argv[0]);
-    open();
+    int old, new;
+    old = open(argv[1], O_RDONLY);
+    new = open(argv[2], O_CREAT | O_WRONLY);
+    char buffer[BUFFER_SIZE];
+
+    int read_bytes = read(old, buffer, sizeof(buffer));
+    if (read_bytes < 0) {
+        fprintf(stderr, "There was a problem with reading a file!\n");
+        return 3;
+    }
+    printf("%d bytes were read", read_bytes);
+    write(new, buffer, read_bytes);
+
+    close(old);
+    close(new);
+
     return 0;
 }
 
@@ -42,7 +60,7 @@ int main(int argc, char *argv[]) {
         }
     }
     if (argc == 3) {
-        cp(argv);
+        if (cp(argv) > 0) return 1;
     }
     return 0;
 }

Topic-1/test.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
-rm raz dwa;
-touch raz;
-gcc main.c -o cp;
-./cp raz dwa;
-ls | grep dwa;
+rm -f old_file new_file;
+echo "QWERTYUIOP" > old_file;
+gcc -Wall main.c -o cp;
+./cp old_file new_file;
+chmod +rw new_file;
+diff old_file new_file;