From d2e1c8ba686d7d4ab32eda91c2f532676e9b8acf Mon Sep 17 00:00:00 2001
From: TheSoeren <imhofabian@gmail.com>
Date: Sun, 29 Sep 2024 14:03:39 +0000
Subject: create write_number function

---
 arch/x86_64/include/arch/video/vga/text.hpp | 50 +++++++++++++++++++++++++++++
 arch/x86_64/src/kernel/main.cpp             | 10 +++---
 arch/x86_64/src/video/vga/text.cpp          | 15 ++++-----
 3 files changed, 63 insertions(+), 12 deletions(-)

(limited to 'arch/x86_64')

diff --git a/arch/x86_64/include/arch/video/vga/text.hpp b/arch/x86_64/include/arch/video/vga/text.hpp
index 1e584d6..97344da 100644
--- a/arch/x86_64/include/arch/video/vga/text.hpp
+++ b/arch/x86_64/include/arch/video/vga/text.hpp
@@ -3,6 +3,7 @@
 
 #include <cstdint>
 #include <string_view>
+#include <type_traits>
 
 namespace teachos::arch::video::vga::text
 {
@@ -108,6 +109,55 @@ namespace teachos::arch::video::vga::text
    * @see vga::text::attribute
    */
   auto write(std::string_view code_points, attribute attribute) -> void;
+
+  /**
+   * @brief Write a single character to the VGA text buffer.
+   *
+   * @note This function also updates the text mode buffer pointer.
+   *
+   * @param code_point A code point to write to the VGA text mode buffer.
+   * @param attribute The attribute to apply to the written sequence of code points.
+   * @see vga::text::attribute
+   */
+  auto write_char(char code_point, attribute attribute) -> void;
+
+  // TODO: Move concepts to their own file/folder
+  template<typename T>
+  concept Integral = std::is_integral_v<T>;
+
+  /**
+   * @brief Write a integral value to the VGA text buffer.
+   *
+   * @note This function also updates the text mode buffer pointer.
+   *
+   * @param code_points A integral value to write to the VGA text mode buffer.
+   * @param attribute The attribute to apply to the written sequence of code points.
+   * @see vga::text::attribute
+   */
+  template<Integral T>
+  auto write_number(T value, attribute attribute) -> void
+  {
+    T current_value = value;
+
+    T divisor = 1;
+    while (current_value > 9)
+    {
+      divisor *= 10;
+      current_value = current_value / 10;
+    }
+
+    current_value = value;
+    while (divisor > 0)
+    {
+      uint8_t quotient = current_value / divisor;
+      char ascii_digit = quotient + '0';
+
+      write_char(ascii_digit, attribute);
+      current_value %= divisor;
+
+      divisor /= 10;
+    }
+  }
 }  // namespace teachos::arch::video::vga::text
 
 #endif
\ No newline at end of file
diff --git a/arch/x86_64/src/kernel/main.cpp b/arch/x86_64/src/kernel/main.cpp
index 8ca577a..a5ffbb4 100644
--- a/arch/x86_64/src/kernel/main.cpp
+++ b/arch/x86_64/src/kernel/main.cpp
@@ -32,10 +32,12 @@ namespace teachos::arch::kernel
           uint32_t size = tag->size;
           uint32_t mem_lower = *(uint32_t *)(&size + 32);
           uint32_t mem_upper = *(uint32_t *)(&size + 64);
-          if (mem_lower > mem_upper)
-          {
-          }
-          text::write("BUFFER IS HERE", text::common_attributes::green_on_black);
+
+          text::write_number(mem_lower, text::common_attributes::green_on_black);
+          text::write("Lower memory bound", text::common_attributes::green_on_black);
+          text::write_number(mem_lower, text::common_attributes::green_on_black);
+          text::write("Upper memory bound", text::common_attributes::green_on_black);
+          text::write_number(mem_upper, text::common_attributes::green_on_black);
           break;
       }
     }
diff --git a/arch/x86_64/src/video/vga/text.cpp b/arch/x86_64/src/video/vga/text.cpp
index f1e7412..bf60410 100644
--- a/arch/x86_64/src/video/vga/text.cpp
+++ b/arch/x86_64/src/video/vga/text.cpp
@@ -17,12 +17,6 @@ namespace teachos::arch::video::vga::text
 
     extern "C" std::pair<char, attribute> * vga_buffer_pointer;
     auto constinit text_buffer = teachos::memory::asm_pointer{vga_buffer_pointer};
-
-    auto write(char code_point, attribute attribute) -> void
-    {
-      auto & p = *text_buffer;
-      (*p++) = std::pair{code_point, attribute};
-    };
   }  // namespace
 
   auto clear(attribute attribute) -> void
@@ -39,9 +33,14 @@ namespace teachos::arch::video::vga::text
     crtc::data_port::write(vga::crtc::data_port::read() | cursor_disable_byte);
   }
 
+  auto write_char(char code_point, attribute attribute) -> void
+  {
+    auto & p = *text_buffer;
+    (*p++) = std::pair{code_point, attribute};
+  };
+
   auto write(std::string_view code_points, attribute attribute) -> void
   {
-    std::ranges::for_each(code_points, [&](auto code_point) { write(code_point, attribute); });
+    std::ranges::for_each(code_points, [&](auto code_point) { write_char(code_point, attribute); });
   }
-
 }  // namespace teachos::arch::video::vga::text
-- 
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