From a8a80d326de9550b2a25b1255a2093ab43219ede Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 27 Jan 2024 23:14:29 -0500
Subject: keyboard input

---
 kernel/include/hilbert/kernel/input.hpp   | 26 ++++++++++++++++
 kernel/include/hilbert/kernel/panic.hpp   |  6 ++++
 kernel/include/hilbert/kernel/utility.hpp | 50 +++++++++++++++++++++++++++++++
 kernel/include/hilbert/kernel/vfile.hpp   |  8 ++---
 4 files changed, 86 insertions(+), 4 deletions(-)
 create mode 100644 kernel/include/hilbert/kernel/input.hpp
 create mode 100644 kernel/include/hilbert/kernel/panic.hpp

(limited to 'kernel/include')

diff --git a/kernel/include/hilbert/kernel/input.hpp b/kernel/include/hilbert/kernel/input.hpp
new file mode 100644
index 0000000..cccb71f
--- /dev/null
+++ b/kernel/include/hilbert/kernel/input.hpp
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <hilbert/kernel/utility.hpp>
+
+namespace hilbert::kernel::input {
+
+  enum : uint32_t {
+    LEFT_SHIFT  = 1 <<  8,
+    RIGHT_SHIFT = 1 <<  9,
+    LEFT_CTRL   = 1 << 10,
+    RIGHT_CTRL  = 1 << 11,
+    LEFT_ALT    = 1 << 12,
+    RIGHT_ALT   = 1 << 13,
+    LEFT_WIN    = 1 << 14,
+    RIGHT_WIN   = 1 << 15,
+    CAPS_LOCK   = 1 << 16,
+    NUM_LOCK    = 1 << 17,
+    BREAK       = 1 << 18,
+  };
+
+  extern utility::queue<uint32_t> *key_queue;
+
+  //must be post switch to kernel page tables and mounting of file systems
+  void init_input();
+
+}
diff --git a/kernel/include/hilbert/kernel/panic.hpp b/kernel/include/hilbert/kernel/panic.hpp
new file mode 100644
index 0000000..545d703
--- /dev/null
+++ b/kernel/include/hilbert/kernel/panic.hpp
@@ -0,0 +1,6 @@
+#pragma once
+
+namespace hilbert::kernel {
+  //prints to terminal and then halts.
+  [[noreturn]] void panic(const char *string_sz);
+}
diff --git a/kernel/include/hilbert/kernel/utility.hpp b/kernel/include/hilbert/kernel/utility.hpp
index 2df1d65..47f78ea 100644
--- a/kernel/include/hilbert/kernel/utility.hpp
+++ b/kernel/include/hilbert/kernel/utility.hpp
@@ -294,4 +294,54 @@ namespace hilbert::kernel::utility {
 
   };
 
+  template <class value_t>
+  struct queue {
+
+    value_t *buffer;
+    unsigned buffer_len;
+    unsigned count;
+    unsigned next_read_index;
+
+    queue(unsigned initial_len = 1024) : buffer(new value_t[initial_len]),
+      buffer_len(initial_len), count(0), next_read_index(0) { }
+
+    ~queue() {
+      delete[] buffer;
+    }
+
+    void insert(const value_t &v) {
+
+      if (count == buffer_len) {
+        value_t *new_buffer = new value_t[buffer_len * 2];
+        for (unsigned i = 0; i < buffer_len - next_read_index; ++i)
+          new_buffer[i] = move(buffer[i + next_read_index]);
+        for (unsigned i = buffer_len - next_read_index; i < buffer_len; ++i)
+          new_buffer[i] = move(buffer[i + next_read_index - buffer_len]);
+        delete[] buffer;
+        buffer = new_buffer;
+        buffer_len *= 2;
+        next_read_index = 0;
+      }
+
+      buffer[(count + next_read_index) % buffer_len] = v;
+      ++count;
+
+    }
+
+    //assumes not empty
+    const value_t &peek() const {
+      return buffer[next_read_index];
+    }
+
+    //assumes not empty
+    value_t &&take() {
+      value_t &&ret = move(buffer[next_read_index]);
+      if (++next_read_index == buffer_len)
+        next_read_index = 0;
+      --count;
+      return move(ret);
+    }
+
+  };
+
 }
diff --git a/kernel/include/hilbert/kernel/vfile.hpp b/kernel/include/hilbert/kernel/vfile.hpp
index f8a387d..b64ae63 100644
--- a/kernel/include/hilbert/kernel/vfile.hpp
+++ b/kernel/include/hilbert/kernel/vfile.hpp
@@ -55,9 +55,9 @@ namespace hilbert::kernel::vfile {
   //TODO: see comment at top of file.
   void set_root(const vfile &root);
 
-  //path must be absolute. follows symlinks on all but the last node.
-  //relative_to should be a directory to do the lookup inside; e.g.,
-  //if relative_to is /a/b and path is c, then out becomes /a/b/c.
-  storage::fs_result lookup_path(const canon_path &path, vfile &out);
+  //path must be absolute. follows symlinks on all but the last node
+  //always, and on the last node when follow_final_symlink is true.
+  storage::fs_result lookup_path(
+    const canon_path &path, vfile &out, bool follow_final_symlink);
 
 }
-- 
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