Add: begin shell with help command

src/kernel/kmain.c

@@ -4,8 +4,6 @@
 #include "idt.h"
 #include "system.h"
 
-#define BUFFER_SIZE 256
-
 int kmain(int retvalue)
 {
   
@@ -34,10 +32,7 @@ int kmain(int retvalue)
   //timer_install();
   keyboard_install();
 
-  char input_buffer[BUFFER_SIZE];
-  colorputs("Enter something: ", 9);
-  get_input(input_buffer, BUFFER_SIZE);
-  printf("\nYou entered: %s\n", input_buffer);
+  shell_install();
 
   return retvalue;
 }

src/kernel/shell.c

@@ -0,0 +1,24 @@
+#include "system.h"
+#include "../libc/stdio.h"
+#include "../libc/string.h"
+
+#define BUFFER_SIZE 256
+
+void shell_install()
+{
+  while (1) // Bad!!
+  {
+    char input_buffer[BUFFER_SIZE];
+    colorputs("blankos> ", 9);
+    get_input(input_buffer, BUFFER_SIZE);
+    printf("\n");
+    
+    // Childish shell
+
+    if (strcmp(input_buffer, "help") == 0)
+    {
+        printf("This is the Blank Operating System\ndesigned for fun by xamidev\n\nCommand help:\n\n\thelp - shows this message\n");
+    }
+
+  }
+}

src/kernel/system.h

@@ -21,5 +21,6 @@ void timer_install();
 void delay(int ticks);
 void keyboard_install();
 char keyboard_getchar();
+void shell_install();
 #endif
 

src/libc/stdio.c

@@ -87,6 +87,9 @@ void putc(char c)
     case '\r':
       VGA_X = 0;
       break;
+    case '\t':
+      VGA_X += 4;
+      break;
     default:
       putchar(VGA_X, VGA_Y, c);
       VGA_X++;
@@ -114,6 +117,9 @@ void colorputc(char c, unsigned int color)
     case '\r':
       VGA_X = 0;
       break;
+    case '\t':
+      VGA_X += 4;
+      break;
     default:
       putchar(VGA_X, VGA_Y, c);
       putcolor(VGA_X, VGA_Y, color);

src/libc/string.c

@@ -7,3 +7,13 @@ int strlen(char* str)
   }
   return len;
 }
+
+int strcmp(char* str1, char* str2)
+{
+  while (*str1 && (*str1 == *str2))
+  {
+    str1++;
+    str2++;
+  }
+  return *(const unsigned char*)str1 - *(const unsigned char*)str2;
+}

src/libc/string.h

@@ -2,5 +2,6 @@
 #define INCLUDE_STRING_H
 
 int strlen(char* str);
+int strcmp(char* str1, char* str2);
 
 #endif