libc: Add a cache to the fread function for reading from files on disk.

This helps a ton when using functions such as fscanf that reads from a
FILE byte by byte. By creating a cache it avoids a ton of 'read'
syscalls that would otherwise be made.

1 files changed, 3 insertions, 0 deletions

diff --git a/userland/libc/include/stdio.h b/userland/libc/include/stdio.h
index 014e2ac..22afbb2 100644
--- a/userland/libc/include/stdio.h
+++ b/userland/libc/include/stdio.h
@@ -34,6 +34,9 @@ struct __IO_FILE {
   uint8_t is_eof;
   uint8_t has_error;
   uint64_t file_size;
+  uint8_t *read_buffer;
+  uint32_t read_buffer_stored;
+  uint32_t read_buffer_has_read;
   void *cookie;
 };