Implement input part of stdio

[nameless-os.git] / kernel / arch / x86 / tty / tty.c

diff --git a/kernel/arch/x86/tty/tty.c b/kernel/arch/x86/tty/tty.c
index 07d734e54fc00f1919e51e0efe624271158c2e01..ca0c3e7df95466878a7a933fc487c073e126b680 100644 (file)
--- a/kernel/arch/x86/tty/tty.c
+++ b/kernel/arch/x86/tty/tty.c
@@ -1,6 +1,7 @@
 #include <io.h>
 #include <tty.h>
 #include <stdint.h>
+#include <input/ps2.h>
 
 #define VGA_WIDTH 80
 #define VGA_HEIGHT 25
@@ -11,6 +12,7 @@ static int cursor_x = 0; /* keep track of where cursor is */
 static int cursor_y = 0;
 
 char *hex_chars = "0123456789ABCDEF";
+char kgets_buffer[100];
 
 void screen_clear(void)
 {
@@ -74,6 +76,16 @@ void kprintc(const char character, uint8_t color)
        uint16_t crtc_port;
 
        if ( character == '\n') { cursor_x = 0; cursor_y++; }
+       if (character == 0x7f) {
+               cursor_x--;
+               if (cursor_x < 0) {
+                       if (cursor_y > 0) {
+                               cursor_x = VGA_WIDTH - 1;
+                               cursor_y--;
+                       } else cursor_x = 0;
+               }
+               video_memory[(cursor_y * VGA_WIDTH + cursor_x) * 2] = ' ';
+       }
        else { video_memory[(cursor_y * VGA_WIDTH + cursor_x) * 2] = character; video_memory[((cursor_y * VGA_WIDTH + cursor_x++) * 2)+ 1] = color != 0 ? color : VGA_COLOR_LIGHT_GRAY; }
        if ( cursor_x >= VGA_WIDTH ) { cursor_x = 0; cursor_y++; }
        if ( cursor_y >= VGA_HEIGHT ) { scroll_up(); }
@@ -137,3 +149,29 @@ void kprintd(uint32_t dword)
        temp = dword & 0xF;
        kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
 }
+
+char *kgets()
+{
+       for (int i=0; i<100; i++) {
+               kgets_buffer[i] = '\0';
+       }
+
+       int i=0;
+       while (i<100) {
+               char temp = ps2_get_keystroke();
+               if (temp == '\n') break;
+               if (temp == 0x7f) {
+                       if (i>0) {
+                               i-=1;
+                               kgets_buffer[i] = '\0';
+                               kprintc(temp, 0);
+                       }
+                       continue;
+               }
+               kgets_buffer[i] = temp;
+               kprintc(temp, 0);
+               i++;
+       }
+
+       return kgets_buffer;
+}