1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
#include<stdbool.h>
#include<stddef.h>
#include<stdint.h>
#include"vga.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
extern char ioport_in(uint8_t port);
extern void ioport_out(uint8_t port, char data);
bool stringcmp(char *str1,char *str2);
static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg)
{
return fg | bg << 4;
}
static inline uint16_t vga_entry(unsigned char uc, uint8_t color)
{
return (uint16_t) uc | (uint16_t) color << 8;
}
size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
uint16_t* terminal_buffer;
void terminal_initialize()
{
terminal_row=0;
terminal_column=0;
terminal_color=vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer=(uint16_t*) 0xB8000;
for(size_t y=0;y<VGA_HEIGHT;y++)
{
for(size_t x=0;x<VGA_WIDTH;x++)
{
const size_t index=y*VGA_WIDTH+x;
terminal_buffer[index]=vga_entry(' ', terminal_color);
}
}
}
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
{
const size_t index=y*VGA_WIDTH+x;
terminal_buffer[index]=vga_entry(c, color);
}
void movescreen()
{
terminal_row--;
for(size_t i=0;i<VGA_HEIGHT;i++) for(size_t j=0;j<VGA_WIDTH;j++) terminal_buffer[i*VGA_WIDTH+j]=terminal_buffer[(i+1)*VGA_WIDTH+j];
}
void next_field()
{
if(++terminal_column==VGA_WIDTH) terminal_column=0,terminal_row++;
}
void previous_field()
{
if(terminal_column) terminal_column--;
else terminal_row--,terminal_column=VGA_WIDTH-1;
}
void terminal_putchar(char c)
{
if(c=='\n') terminal_column=0,terminal_row++;
else
{
terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
next_field();
}
if (terminal_row==VGA_HEIGHT) movescreen();
}
void terminal_writestring(const char* data)
{
for(int i=0;data[i]!='\0';i++) terminal_putchar(data[i]);
}
void prompt()
{
terminal_writestring("[user@myos] > ");
}
void clear()
{
for(size_t i=0;i<VGA_HEIGHT;i++) for(size_t j=0;j<VGA_WIDTH;j++) terminal_putchar(' ');
terminal_column=0;
terminal_row=0;
}
|
