about summary refs log tree commit diff stats
path: root/tools/iso/kernel.soso/tty.c
blob: 9e53c339f6ad779baecf09d3cf8fc13fb3d2fe47 (plain) (blame)
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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
#include "tty.h"
#include "alloc.h"

Tty* createTty(uint16 lineCount, uint16 columnCount, TtyFlushScreenFunction flushFunction) {
    Tty* tty = kmalloc(sizeof(Tty));
    memset((uint8*)tty, 0, sizeof(Tty));

    tty->lineCount = lineCount;
    tty->columnCount = columnCount;
    tty->buffer = kmalloc(tty->lineCount * tty->columnCount * 2);
    tty->currentColumn = 0;
    tty->currentLine = 0;
    tty->color = 0x0A;

    memset(tty->lineBuffer, 0, TTY_LINEBUFFER_SIZE);
    tty->lineBufferIndex = 0;
    tty->keyBuffer = FifoBuffer_create(64);
    tty->flushScreen = flushFunction;

    tty->term.c_cc[VMIN] = 1;
    tty->term.c_lflag |= ECHO;
    tty->term.c_lflag |= ICANON;

    Tty_Clear(tty);

    return tty;
}

void destroyTty(Tty* tty) {
    FifoBuffer_destroy(tty->keyBuffer);
    kfree(tty->buffer);
    kfree(tty);
}

void Tty_Print(Tty* tty, int row, int column, const char* text) {
    unsigned char * video = tty->buffer;

    video += (row * tty->columnCount + column) * 2;
    while(*text != 0) {
        *video++ = *text++;
        *video++ = tty->color;
    }
}

//One line
void Tty_ScrollUp(Tty* tty) {
    unsigned char * videoLine = tty->buffer;
    unsigned char * videoLineNext = tty->buffer;
    int line = 0;
    int column = 0;

    for (line = 0; line < tty->lineCount - 1; ++line) {
        for (column = 0; column < tty->columnCount; ++column) {
            videoLine = tty->buffer + (line * tty->columnCount + column) * 2;
            videoLineNext = tty->buffer + ((line + 1) * tty->columnCount + column) * 2;

            videoLine[0] = videoLineNext[0];
            videoLine[1] = videoLineNext[1];
        }
    }

    //Last line should be empty.
    unsigned char * lastLine = tty->buffer + ((tty->lineCount - 1) * tty->columnCount) * 2;
    for (int i = 0; i < tty->columnCount * 2; i += 2) {
        lastLine[i] = 0;
        lastLine[i + 1] = tty->color;
    }
}

void Tty_Clear(Tty* tty) {
    unsigned char * video = tty->buffer;
    int i = 0;

    for (i = 0; i < tty->lineCount * tty->columnCount; ++i) {
        *video++ = 0;
        *video++ = tty->color;
    }

    tty->currentLine = 0;
    tty->currentColumn = 0;
}

void Tty_PutChar(Tty* tty, char c) {
    unsigned char * video = tty->buffer;

    if ('\n' == c || '\r' == c) {
        ++tty->currentLine;
        tty->currentColumn = 0;

        if (tty->currentLine >= tty->lineCount - 0) {
            --tty->currentLine;
            Tty_ScrollUp(tty);
        }

        Tty_MoveCursor(tty, tty->currentLine, tty->currentColumn);
        return;
    }
    else if ('\b' == c) {
        if (tty->currentColumn > 0) {
            --tty->currentColumn;
            c = '\0';
            video = tty->buffer + (tty->currentLine * tty->columnCount + tty->currentColumn) * 2;
            video[0] = c;
            video[1] = tty->color;
            Tty_MoveCursor(tty, tty->currentLine, tty->currentColumn);
            return;
        }
        else if (tty->currentColumn == 0) {
            if (tty->currentLine > 0) {
                --tty->currentLine;
                tty->currentColumn = tty->columnCount - 1;
                c = '\0';
                video = tty->buffer + (tty->currentLine * tty->columnCount + tty->currentColumn) * 2;
                video[0] = c;
                video[1] = tty->color;
                Tty_MoveCursor(tty, tty->currentLine, tty->currentColumn);
                return;
            }
        }
    }

    if (tty->currentColumn >= tty->columnCount) {
        ++tty->currentLine;
        tty->currentColumn = 0;
    }

    if (tty->currentLine >= tty->lineCount - 0) {
        --tty->currentLine;
        Tty_ScrollUp(tty);
    }

    video += (tty->currentLine * tty->columnCount + tty->currentColumn) * 2;

    video[0] = c;
    video[1] = tty->color;

    ++tty->currentColumn;

    Tty_MoveCursor(tty, tty->currentLine, tty->currentColumn);
}

void Tty_PutText(Tty* tty, const char* text) {
    const char* c = text;
    while (*c) {
        Tty_PutChar(tty, *c);
        ++c;
    }
}

void Tty_MoveCursor(Tty* tty, uint16 line, uint16 column) {
    tty->currentLine = line;
    tty->currentColumn = column;
}