feat: kgets()

kernel/inc/drivers/console.h

@@ -14,5 +14,6 @@ void console_set_color(u32 color);
 void console_set_cursor_pos(SG_Point *p);
 void kprint(const char *str);
 void kprintf(const char *fmt, ...);
+void kgets(char* buff, u32 lim);
 
 #endif

kernel/inc/drivers/keyboard.h

@@ -3,6 +3,15 @@
 
 #include <types.h>
 
+#define KB_BUFF_SIZE 256
+typedef struct { 
+    char buffer[KB_BUFF_SIZE];
+    u16 head;
+    u16 tail;
+} kb_buffer;
+
+extern kb_buffer kb_buf;
+
 void kb_handler(Registers *regs);
 
 #endif

kernel/src/drivers/console.c

@@ -5,6 +5,7 @@
 #include <drivers/serial.h>
 #include <drivers/font.h>
 #include <drivers/shitgui.h>
+#include <drivers/keyboard.h>
 
 #include <core/math.h>
 #include <types.h>
@@ -212,4 +213,41 @@ void kprintf(const char *fmt, ...) {
 
 void console_set_color(u32 color) {
     s_color = color;
-}
+}
+
+static char console_getc() {
+    while (kb_buf.head == kb_buf.tail) __asm__ volatile ("sti; hlt");
+    __asm__ volatile ("cli");
+    char temp = kb_buf.buffer[kb_buf.tail];
+    kb_buf.tail = (kb_buf.tail + 1) % KB_BUFF_SIZE;
+    __asm__ volatile ("sti");
+    return temp;
+}
+
+void kgets(char* buff, u32 lim) {
+    u32 i = 0;
+    while (true) {
+        char c = console_getc();
+        switch (c) {
+            case '\n': { 
+                buff[i] = '\0';
+                kprintf("\n");
+                return;
+            }
+            case '\b': {
+                if (i > 0) {
+                    i--;
+                    kprintf("\b \b");
+                }
+                break;
+            }
+            default: {
+                if (i < lim - 1) { 
+                    buff[i] = c;
+                    kprintf("%c", c);
+                    i++;
+                }
+            }
+        }
+    }
+}

kernel/src/drivers/keyboard.c

@@ -83,15 +83,19 @@ unsigned char keyboard_map_shifted[128] = {
 };
 
 bool shift_pressed = false;
+kb_buffer kb_buf = {0};
 
 void kb_handler(Registers *regs) {
+    u16 next_head = (kb_buf.head + 1) % KB_BUFF_SIZE;
+
     u8 scancode = inb(0x60);
     // make code 0x00 - 0x7F; break code = make code + 0x80
     if (scancode < 0x80) {
         unsigned char* arr = shift_pressed ? keyboard_map_shifted : keyboard_map;
         char ascii = arr[scancode];
-        if (ascii) {
-            kprintf("%c", ascii);
+        if (ascii && next_head != kb_buf.tail) {
+            kb_buf.buffer[kb_buf.head] = ascii;
+            kb_buf.head = next_head;
         } else {
             switch (scancode) {
                 case 0x2A: shift_pressed = true; break;
@@ -106,4 +110,4 @@ void kb_handler(Registers *regs) {
     }
     outb(MASTER_COMMAND, 0x20);
    // kprintf("Key: %x; shift is %spressed\n", scancode, shift_pressed ? "" : "not ");
-}
+}

kernel/src/kmain.c

@@ -17,9 +17,6 @@
 #include <mm/vmm.h>
 
 extern u64 _kernel_end;
-extern u8* bitmap;
-extern u64 bitmap_size_g;
-extern u64* pml4_kernel;
 
 void kmain(Bootinfo* info) {
     u32 *fb = (u32*)info->framebuffer.base;
@@ -31,17 +28,19 @@ void kmain(Bootinfo* info) {
     sg_ctx.width = info->framebuffer.width;
     sg_ctx.pitch = info->framebuffer.pitch;
 
-
-    SG_Point start_pos = {75, 55}; // greeting
     serial_init();
     console_init(&sg_ctx);
-    console_clear(0xFFFFFF);
-    console_set_cursor_pos(&start_pos);
-    console_set_color(0x000000);
 
     gdt_init();
     idt_init();
     pic_remap();
+    pmm_init(info->mem);
+    vmm_init(info);
+
+    SG_Point start_pos = {75, 55}; // greeting
+    console_clear(0xFFFFFF);
+    console_set_cursor_pos(&start_pos);
+    console_set_color(0x000000);
 
     SG_Point logo_point = {0, 10};
     sg_put_img(&sg_ctx, &logo_point, &logo_img);
@@ -50,9 +49,10 @@ void kmain(Bootinfo* info) {
     SG_Point text_normal_point = {0, 120};  // not nice to hardcode nums like that but we have what we have
     console_set_cursor_pos(&text_normal_point);
 
-    pmm_init(info->mem);
-    
-    vmm_init(info);
+    kprintf("ksh_> ");
+    char buff[32];
+    kgets(buff, 32);
+    kprintf("You typed: %s", &buff);
 
     __asm__ volatile ("sti");