finished copy (syscall)

struct/lib_fs.c

@@ -7,11 +7,35 @@
 
 int copy(char *src, char *dst, unsigned int buf_size)
 {
+    int byte_count = 0;
+    size_t real_size = 0;
+    char buff[buf_size];
     int fd_src = open(src, O_RDONLY);
+
+    if (fd_src < 0)
+    {
+        perror(src);
+        return -1;
+    }
+
     int fd_dst = open(dst, O_WRONLY | O_CREAT, 0640);
 
+    if (fd_dst < 0)
+    {
+        perror(dst);
+        return -1;
+    }
+
+    while ((real_size = read(fd_src, buff, buf_size)))
+    {
+        fprintf(stdout, "Real number of bytes copied : %zu\n", real_size);
+        byte_count += write(fd_dst, buff, real_size);
+    }
+
     close(fd_src);
     close(fd_dst);
+
+    return byte_count;
 }
 
 int copyf(char *src, char *dst, unsigned int buf_size)

test_lib.c

@@ -5,17 +5,50 @@
 
 int main(int argc, char **argv)
 {
-    if (argc < 2)
+    if (argc < 3)
     {
         fprintf(stderr, "Not enough arguments were provided\n");
-        fprintf(stderr, "\tUsage: ./%s <buf_size>\n", basename(argv[0]));
+        fprintf(stderr, "\tUsage: ./%s <buf_size> <mode (0 => copy; 1 => copyf)>\n", basename(argv[0]));
         return EXIT_FAILURE;
     }
 
-    char *src = "./src.txt";
+    int ret = 0;
+    char *src = "./srb.txt";
     char *dst = "./dst.txt";
 
-    fprintf(stdout, "\ncopyf(char %s, char %s, unsigned int %d)\tNumber of bytes copied: %d\n", src, dst, atoi(argv[1]), copyf(src, dst, atoi(argv[1])));
+    switch (atoi(argv[2]))
+    {
+    case 0:
+
+        ret = copy(src, dst, atoi(argv[1]));
+
+        if (ret != -1)
+        {
+            fprintf(stdout, "\ncopy(char %s, char %s, unsigned int %d)\tNumber of bytes copied: %d\n", src, dst, atoi(argv[1]), ret);
+        }
+        else
+        {
+            return EXIT_FAILURE;
+        }
+
+        break;
+    case 1:
+
+        ret = copyf(src, dst, atoi(argv[1]));
+
+        if (ret != -1)
+        {
+            fprintf(stdout, "\ncopyf(char %s, char %s, unsigned int %d)\tNumber of bytes copied: %d\n", src, dst, atoi(argv[1]), ret);
+        }
+        else
+        {
+            return EXIT_FAILURE;
+        }
+
+        break;
+    default:
+        break;
+    }
 
     return EXIT_SUCCESS;
 }