init commit

3sem/exam/2021/2-wrong.c

@@ -0,0 +1,55 @@
+#include <unistd.h>
+#include <fcntl.h>
+
+// Стоит добавить проверки на успешность системных вызовов
+
+enum
+{
+    BlockSize = 16,
+}
+
+int fds[4];
+unsigned int sizes[4];
+char **list = [ "Disk0", "Disk0", "Disk0", "Disk0" ];
+
+void
+Ini_Raid0(void)
+{
+    struct stat st;
+    for (int i = 0; i < 4; ++i) {
+        fds[i] = open(list[i], O_RDWR);
+        lstat(list[i], &st);
+        sizes[i] = st.st_size;
+        if (i != 0) {
+            sizes[i] += sizes[i - 1];
+        }
+    }
+
+    return;
+}
+
+void
+Read_Raid0(int num, char *buf)
+{
+    unsigned int byte = num * BlockSize;
+    int now_disk = 0;
+
+    for (int i = 0; i < BlockSize; ++i) {
+        while (byte > sizes[now_disk]) {
+            now_disk++;
+        }
+
+        if (now_disk > 3) {
+            _exit(1);
+        }
+
+        if (now_disk != 0) {
+            lseek(fds[now_disk], byte - sizes[now_disk - 1]);
+        } else {
+            lseek(fds[now_disk], byte);
+        }
+        read(fds[now_disk], 1, buf + i);
+    }
+
+    return;
+}