1 files changed, 51 insertions, 0 deletions

diff --git a/src/samizdat-ficlonerange.c b/src/samizdat-ficlonerange.c
new file mode 100644
index 0000000..a620cbf
--- /dev/null
+++ b/src/samizdat-ficlonerange.c
@@ -0,0 +1,51 @@
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+int main(int argc, char **argv)
+{
+  if (argc != 6)
+    {
+      fputs("Error: usage: wrong number of arguments\n", stderr);
+      return -1;
+    }
+  char *src_name = argv[1];
+  char *dest_name = argv[2];
+  u_int64_t src_offset = atoll(argv[3]);
+  u_int64_t src_length = atoll(argv[4]);
+  u_int64_t dest_offset = atoll(argv[5]);
+
+  int src, dest;
+  if ((src = open(src_name, O_RDONLY)) < 0)
+    {
+      perror("Error opening input file");
+      return 1;
+    }
+  if ((dest = open(dest_name, O_RDWR | O_CREAT)) < 0)
+    {
+      perror("Error opening output file");
+      return 2;
+    }
+  if (dest_offset == 0)
+    {
+      struct stat buf;
+      stat(dest_name, &buf);
+      dest_offset = buf.st_size;
+    }
+
+  struct file_clone_range s = {src, src_offset, src_length, dest_offset};
+  if (ioctl(dest, FICLONERANGE, &s))
+    {
+      perror("ioctl FICLONERANGE failed");
+      return 3;
+    }
+  else
+    {
+      return 0;
+    }
+}
+