Espresso 0.0.0f

drivers/tty.c

@@ -1,8 +1,6 @@
-#include <types.h>
-
 #include <string.h>
-#include <port_io.h>
 #include <vga/vga.h>
+
 #include <tty.h>
 
 static size_t terminal_row;
@@ -80,6 +78,28 @@ void terminal_putchar(const char c)
     
     return;
   }
+  else if (uc == '\b')
+  {
+    if (terminal_column == 0)
+    {
+      terminal_row -= 1;
+      
+      if (terminal_row <= -1)
+      {
+        terminal_row = 0;
+      }
+      
+      terminal_column = VGA_WIDTH;
+      
+      terminal_putentryat(' ', terminal_getcolor(), (size_t)terminal_column, (size_t)terminal_row);
+    }
+    else
+    {
+      terminal_putentryat(' ', terminal_getcolor(), (size_t)--terminal_column, (size_t)terminal_row);
+    }
+
+    return;
+  }
 	
   terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
   
@@ -178,3 +198,51 @@ void terminal_scroll(void)
     terminal_buffer[index] = (terminal_color << 8) | ' ';
   }
 }
+
+unsigned char terminal_get_shifted(unsigned char uc)
+{
+  unsigned char lowerc[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '\0' };
+  unsigned char upperc[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '\0' };
+  unsigned char nums[]   = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '\0' };
+  unsigned char nsyms[]  = { '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '\0' };
+  unsigned char syms1[]  = { ',', '.', '/', ';', '\'', '[', ']', '`', '-', '=', '\\', '\0' };
+  unsigned char syms2[]  = { '<', '>', '?', ':', '\"', '{', '}', '~', '_', '+', '|', '\0' };
+  
+  for (int32_t i = 0; i < (int32_t)(strlen((char*)lowerc) - 1); ++i)
+  {
+    if (uc == lowerc[i])
+    {
+      return upperc[i];
+    }
+    else if (uc == upperc[i])
+    {
+      return lowerc[i];
+    }
+  }
+  
+  for (int32_t i = 0; i < (int32_t)(strlen((char*)nums) - 1); ++i)
+  {
+    if (uc == nums[i])
+    {
+      return nsyms[i];
+    }
+    else if (uc == nsyms[i])
+    {
+      return nums[i];
+    }
+  }
+  
+  for (int32_t i = 0; i < (int32_t)(strlen((char*)syms1) - 1); ++i)
+  {
+    if (uc == syms1[i])
+    {
+      return syms2[i];
+    }
+    else if (uc == syms2[i])
+    {
+      return syms1[i];
+    }
+  }
+  
+  return '\0';
+}