4 files changed, 47 insertions, 18 deletions

diff --git a/src/user/knob/block.c b/src/user/knob/block.c
index e890fa1..7524ad3 100644
--- a/src/user/knob/block.c
+++ b/src/user/knob/block.c
@@ -9,7 +9,7 @@ void blockcpy(void *to, const void *from, uint32_t size) {
 
 //unsophisticated, should check by dwords wheere available
 __attribute__ ((__pure__))
-bool blockequ(void *a, void *b, uint32_t size) {
+bool blockequ(const void *a, const void *b, uint32_t size) {
   for (uint32_t i = 0; i < size; ++i)
     if (*(uint8_t *)(a++) != *(uint8_t *)(b++))
       return false;
diff --git a/src/user/knob/file.c b/src/user/knob/file.c
index 0032cf2..23b7564 100644
--- a/src/user/knob/file.c
+++ b/src/user/knob/file.c
@@ -3,7 +3,21 @@
 #include <knob/heap.h>
 #include <knob/env.h>
 
+struct ofl_node {
+  struct ofl_node *next;
+  struct ofl_node *prev;
+  _file_handle_t handle;
+};
+
+static struct ofl_node *head_ofl_node = 0;
+
+void _close_all_files() {
+  for (struct ofl_node *i = head_ofl_node; i; i = i->next)
+    _close_file(i->handle);
+}
+
 struct file {
+  struct ofl_node *node;
   _file_handle_t handle;
   uint32_t position;
   uint32_t length;
@@ -38,7 +52,16 @@ struct file *open_file(const char *path) {
   if (!h)
     return 0;
 
+  struct ofl_node *new_node = get_block(sizeof(struct ofl_node));
+  new_node->next = head_ofl_node;
+  new_node->prev = 0;
+  new_node->handle = h;
+  if (head_ofl_node)
+    head_ofl_node->prev = new_node;
+  head_ofl_node = new_node;
+
   struct file *f = get_block(sizeof(struct file));
+  f->node = new_node;
   f->handle = h;
   f->position = 0;
   f->length = _file_size(h);
@@ -48,6 +71,14 @@ struct file *open_file(const char *path) {
 
 void close_file(struct file *f) {
   _close_file(f->handle);
+  struct ofl_node *n = f->node;
+  if (n->next)
+    n->next->prev = n->prev;
+  if (n->prev)
+    n->prev->next = n->next;
+  if (n == head_ofl_node)
+    head_ofl_node = n->next;
+  free_block(n);
   free_block(f);
 }
 
@@ -61,6 +92,19 @@ uint32_t read_from_file(struct file *f, uint32_t max, void *buf) {
   return read;
 }
 
+//return value and max_length don't include null terminator
+uint32_t read_line_from_file(struct file *f, char *sz, uint32_t max_length) {
+  uint8_t i;
+  for (i = 0; i < max_length; ++i) {
+    char byte;
+    if (!read_from_file(f, 1, &byte) || (byte == '\n'))
+      break;
+    sz[i] = byte;
+  }
+  sz[i] = '\0';
+  return i;
+}
+
 uint32_t seek_file_to(struct file *f, uint32_t to) {
   if (to > f->length)
     to = f->length;
diff --git a/src/user/knob/quit.c b/src/user/knob/quit.c
index 7c20bdd..98881b7 100644
--- a/src/user/knob/quit.c
+++ b/src/user/knob/quit.c
@@ -1,6 +1,8 @@
 #include <pland/syscall.h>
+#include <knob/file.h>
 
 __attribute__ ((noreturn))
 void quit() {
+  _close_all_files();
   _exit_task();
 }
\ No newline at end of file
diff --git a/src/user/knob/user.c b/src/user/knob/user.c
index c84977c..b642f79 100644
--- a/src/user/knob/user.c
+++ b/src/user/knob/user.c
@@ -134,23 +134,6 @@ void tell_user_sz(const char *sz) {
   _log_string(sz);
 }
 
-void tell_user_n(uint32_t n) {
-  char buf[11];
-  char *buf_ptr = buf;
-  bool zero_yet = false;
-  for (uint32_t d = 1000000000U; d; d /= 10) {
-    uint8_t v = (n / d ) % 10;
-    if (v || zero_yet) {
-      zero_yet = true;
-      *buf_ptr++ = v | '0';
-    }
-  }
-  if (buf_ptr == buf)
-    *buf_ptr++ = '0';
-  *buf_ptr = '\0';
-  tell_user_sz(buf);
-}
-
 //return value and max_length don't include null terminator
 uint32_t ask_user_line_sz(char *sz, uint32_t max_length) {
   char log_buf[2];