1 files changed, 34 insertions, 0 deletions
diff --git a/semestr-5/so/lista4/so21_lista_4/mkholes.c b/semestr-5/so/lista4/so21_lista_4/mkholes.c
new file mode 100644
index 0000000..d719fd4
--- /dev/null
+++ b/semestr-5/so/lista4/so21_lista_4/mkholes.c
@@ -0,0 +1,34 @@
+#include "csapp.h"
+
+#define BLKSZ 4096 /* block size */
+#define NBLKS 8192 /* number of blocks written to a file */
+#define WRAP 64
+
+int main(void) {
+  int fd = Open("holes.bin", O_CREAT | O_TRUNC | O_WRONLY, 0644);
+
+  int usedblks = 0;
+
+  for (int i = 0; i < NBLKS; i++) {
+    if (i % WRAP == 0)
+      dprintf(STDERR_FILENO, "%04d ", i);
+    if (random() % 64) {
+      Lseek(fd, BLKSZ, SEEK_CUR);
+      Write(STDERR_FILENO, ".", 1);
+    } else {
+      char blk[BLKSZ];
+      for (int j = 0; j < BLKSZ; j++)
+        blk[j] = random();
+      Write(fd, blk, BLKSZ);
+      Write(STDERR_FILENO, "O", 1);
+      usedblks++;
+    }
+    if (i % WRAP == WRAP - 1)
+      Write(STDERR_FILENO, "\n", 1);
+  }
+  Close(fd);
+
+  dprintf(STDERR_FILENO, "Non-zero blocks: %d\n", usedblks);
+
+  return 0;
+}