blob: c2cdaf1860cc4b6b0a19a8a6aa86fc00e71b1c54 (
plain)
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
|
#include "print.h"
#define MAX_COL 80
#define MAX_LINE 25
struct VIDEO_STATE {
u8 *mem;
u8 col;
u8 line;
u8 bg;
u8 fg;
};
VIDEO_STATE VS={
(u8 *)0xB8000,
0,
0,
BLACK,
GRAY,
};
void putchar(char c){
// Handle newline here
if(c=='\n'){
VS.col=0;
VS.line+=1;
if(VS.line>=MAX_LINE){
VS.line=MAX_LINE-1;
scrollup();
}
return;
}
// Print char
VS.mem[VS.col*2+MAX_COL*VS.line*2]=c;
VS.mem[VS.col*2+MAX_COL*VS.line*2+1]=VS.fg|VS.bg<<4;
// Refresh location
VS.col+=1;
if(VS.col>= MAX_COL){
VS.col=0;
VS.line+=1;
if(VS.line>=MAX_LINE){
VS.line=MAX_LINE-1;
scrollup();
}
}
}
void print(char *str){
int i=0;
while(str[i]!='\0'){
putchar(str[i]);
i++;
}
}
void printc(char* str,VIDEO_COLORS c){
VIDEO_COLORS backup=VS.fg;
VS.fg=c;
print(str);
VS.fg=backup;
}
void clear(){
for(char i=0;i<MAX_LINE;i++){
scrollup();
}
}
void scrollup(){
// Move VS.line up
for(char i=1;i<=MAX_LINE;i++){
for(char j=0;j<=MAX_COL;j++)
VS.mem[j*2+MAX_COL*(i-1)*2]=VS.mem[j*2+MAX_COL*i*2];
}
// Clear last VS.line
for(char i=0;i<=MAX_COL;i++){
VS.mem[i*2+MAX_COL*(MAX_LINE-1)*2]='\0';
}
}
|
