From 44c0352f0d4124d7c367352e4de746a51b9db42b Mon Sep 17 00:00:00 2001
From: Benji Dial <benji3.141@gmail.com>
Date: Mon, 25 May 2020 15:35:45 -0400
Subject: got file loading working properly

---
 src/kernel/fat.c | 48 ++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 38 insertions(+), 10 deletions(-)

(limited to 'src/kernel/fat.c')

diff --git a/src/kernel/fat.c b/src/kernel/fat.c
index e574da5..b8d1c3b 100644
--- a/src/kernel/fat.c
+++ b/src/kernel/fat.c
@@ -7,8 +7,28 @@ void load_fat() {
   read_sectors(FAT_INFO->reserved_sectors, FAT_INFO->sectors_per_fat, FAT);
 }
 
-bool check_fat_name(uint8_t *fname, uint8_t *sname) {
-  panic("Not implemented (check_fat_name)");
+bool to_fat_name(uint8_t *sname, uint8_t *fname) {
+  uint8_t *sp = sname, *fp = fname;
+  while (*sp != '.') {
+    if (!*sp) {
+      while (fp != fname + 11)
+        *(fp++) = ' ';
+      return false;
+    }
+    if (sp == sname + 8)
+      return true;
+    *(fp++) = *(sp++);
+  }
+  while (fp != fname + 8)
+    *(fp++) = ' ';
+  while (*++sp) {
+    if (fp == fname + 11)
+      return true;
+    *(fp++) = *sp;
+  }
+  while (fp != fname + 11)
+    *(fp++) = ' ';
+  return false;
 }
 
 bool check_fat_names(uint8_t *lname, uint8_t *rname) {
@@ -27,27 +47,35 @@ void load_root() {
 }
 
 struct directory_entry *load_subentry(uint8_t *name) {
+  uint8_t fname[11];
+  if (to_fat_name(name, fname))
+    return 0;
   struct directory_entry *ptr = buffer;
   uint16_t dir_current = dir_start;
-  do
-    if (((ptr == buffer + 16) && !read_sectors(buffer_from = dir_current++, 1, ptr = buffer)) || !ptr->name[0])
-      return 0;
-  while (!check_fat_name(ptr->name, name));
-  return ptr;
+  read_sectors(buffer_from = dir_current, 1, buffer);
+  while (*(uint8_t *)ptr) {
+    if (check_fat_names(ptr->name, fname))
+      return ptr;
+    if (++ptr == buffer + 16) {
+      read_sectors(buffer_from = ++dir_current, 1, buffer);
+      ptr = buffer;
+    }
+  };
+  return 0;
 }
 
 bool load_subdir(uint8_t *name) {
   struct directory_entry *e = load_subentry(name);
   if (!e)
     return true;
-  dir_start = e->first_cluster;
+  dir_start = CTOS(e->first_cluster);
   return false;
 }
 
 struct directory_entry *load_entry(uint8_t *path) {
   load_root();
-  for (uint8_t *ptr = path; ptr; ++ptr)
-    if (*ptr = '/') {
+  for (uint8_t *ptr = path; *ptr; ++ptr)
+    if (*ptr == '/') {
       *ptr = 0;
       if (load_subdir(path))
         return 0;
-- 
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