/* ----------------------------------------------------------------------- *
*
* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* ansi.c
*
* ANSI character code engine
*/
#include <string.h>
#include <colortbl.h>
#include "ansi.h"
static const struct term_state default_state = {
.state = st_init,
.pvt = false,
.nparms = 0,
.xy = {0, 0},
.cindex = 0, /* First color table entry */
.vtgraphics = false,
.intensity = 1,
.underline = false,
.blink = false,
.reverse = false,
.fg = 7,
.bg = 0,
.autocr = true, /* Mimic \n -> \r\n conversion by default */
.autowrap = true, /* Wrap lines by default */
.saved_xy = {0, 0},
.cursor = true,
};
/* DEC VT graphics to codepage 437 table (characters 0x60-0x7F only) */
static const char decvt_to_cp437[] = {
0004, 0261, 0007, 0007, 0007, 0007, 0370, 0361,
0007, 0007, 0331, 0277, 0332, 0300, 0305, 0304,
0304, 0304, 0137, 0137, 0303, 0264, 0301, 0302,
0263, 0363, 0362, 0343, 0330, 0234, 0007, 00
};
void __ansi_init(const struct term_info *ti)
{
memcpy(ti->ts, &default_state, sizeof default_state);
}
void __ansi_putchar(const struct term_info *ti, uint8_t ch)
{
const struct ansi_ops *op = ti->op;
struct term_state *st = ti->ts;
const int rows = ti->rows;
const int cols = ti->cols;
struct curxy xy = st->xy;
switch (st->state) {
case st_init:
switch (ch) {
case 1 ... 5:
st->state = st_tbl;
st->parms[0] = ch;
break;
case '\a':
op->beep();
break;
case '\b':
if (xy.x > 0)
xy.x--;
break;
case '\t':
{
int nsp = 8 - (xy.x & 7);
while (nsp--)
__ansi_putchar(ti, ' ');
}
return; /* Cursor already updated */
case '\n':
case '\v':
case '\f':
xy.y++;
if (st->autocr)
xy.x = 0;
break;
case '\r':
xy.x = 0;
break;
case 127:
/* Ignore delete */
break;
case 14:
st->vtgraphics = 1;
break;
case 15:
st->vtgraphics = 0;
break;
case 27:
st->state = st_esc;
break;
default:
/* Print character */
if (ch >= 32) {
if (st->vtgraphics && (ch & 0xe0) == 0x60)
ch = decvt_to_cp437[ch - 0x60];
op->write_char(xy.x, xy.y, ch, st);
xy.x++;
}
break;
}
break;
case st_esc:
switch (ch) {
case '%':
case '(':
case ')':
case '#':
/* Ignore this plus the subsequent character, allows
compatibility with Linux sequence to set charset */
break;
case '[':
st->state = st_csi;
st->nparms = 0;
st->pvt = false;
memset(st->parms, 0, sizeof st->parms);
break;
case 'c':
/* Reset terminal */
memcpy(&st, &default_state, sizeof st);
op->erase(st, 0, 0, cols - 1, rows - 1);
xy.x = xy.y = 0;
st->state = st_init;
break;
default:
/* Ignore sequence */
st->state = st_init;
break;
}
break;
case st_csi:
{
int p0 = st->parms[0] ? st->parms[0] : 1;
if (ch >= '0' && ch <= '9') {
st->parms[st->nparms] = st->parms[st->nparms] * 10 + (ch - '0');
} else if (ch == ';') {
st->nparms++;
if (st->nparms >= ANSI_MAX_PARMS)
st->nparms = ANSI_MAX_PARMS - 1;
break;
} else if (ch == '?') {
st->pvt = true;
} else {
switch (ch) {
case 'A':
{
int y = xy.y - p0;
xy.y = (y < 0) ? 0 : y;
}
break;
case 'B':
{
int y = xy.y + p0;
xy.y = (y >= rows) ? rows - 1 : y;
}
break;
case 'C':
{
int x = xy.x + p0;
xy.x = (x >= cols) ? cols - 1 : x;
}
break;
case 'D':
{
int x = xy.x - p0;
xy.x = (x < 0) ? 0 : x;
}
break;
case 'E':
{
int y = xy.y + p0;
xy.y = (y >= rows) ? rows - 1 : y;
xy.x = 0;
}
break;
case 'F':
{
int y = xy.y - p0;
xy.y = (y < 0) ? 0 : y;
xy.x = 0;
}
break;
case 'G':
case '\'':
{
int x = st->parms[0] - 1;
xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x;
}
break;
case 'H':
case 'f':
{
int y = st->parms[0] - 1;
int x = st->parms[1] - 1;
xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x;
xy.y = (y >= rows) ? rows - 1 : (y < 0) ? 0 : y;
}
break;
case 'J':
{
switch (st->parms[0]) {
case 0:
op->erase(st, xy.x, xy.y, cols - 1, xy.y);
if (xy.y < rows - 1)
op->erase(st, 0, xy.y + 1, cols - 1, rows - 1);
break;
case 1:
if (xy.y > 0)
op->erase(st, 0, 0, cols - 1, xy.y - 1);
if (xy.y > 0)
op->erase(st, 0, xy.y, xy.x - 1, xy.y);
break;
case 2:
op->erase(st, 0, 0, cols - 1, rows - 1);
break;
default:
/* Ignore */
break;
}
}
break;
case 'K':
{
switch (st->parms[0]) {
case 0:
op->erase(st, xy.x, xy.y, cols - 1, xy.y);
break;
case 1:
if (xy.x > 0)
op->erase(st, 0, xy.y, xy.x - 1, xy.y);
break;
case 2:
op->erase(st, 0, xy.y, cols - 1, xy.y);
break;
default:
/* Ignore */
break;
}
}
break;
case 'h':
case 'l':
{
bool set = (ch == 'h');
switch (st->parms[0]) {
case 7: /* DECAWM */
st->autowrap = set;
break;
case 20: /* LNM */
st->autocr = set;
break;
case 25: /* DECTECM */
st->cursor = set;
op->showcursor(st);
break;
default:
/* Ignore */
break;
}
break;
}
case 'm':
{
static const int ansi2pc[8] =
{ 0, 4, 2, 6, 1, 5, 3, 7 };
int i;
for (i = 0; i <= st->nparms; i++) {
int a = st->parms[i];
switch (a) {
case 0:
st->fg = 7;
st->bg = 0;
st->intensity = 1;
st->underline = 0;
st->blink = 0;
st->reverse = 0;
break;
case 1:
st->intensity = 2;
break;
case 2:
st->intensity = 0;
break;
case 4:
st->underline = 1;
break;
case 5:
st->blink = 1;
break;
case 7:
st->reverse = 1;
break;
case 21:
case 22:
st->intensity = 1;
break;
case 24:
st->underline = 0;
break;
case 25:
st->blink = 0;
break;
case 27:
st->reverse = 0;
break;
case 30 ... 37:
st->fg = ansi2pc[a - 30];
break;
case 38:
st->fg = 7;
st->underline = 1;
break;
case 39:
st->fg = 7;
st->underline = 0;
break;
case 40 ... 47:
st->bg = ansi2pc[a - 40];
break;
case 49:
st->bg = 7;
break;
default:
/* Do nothing */
break;
}
}
}
break;
case 's':
st->saved_xy = xy;
break;
case 'u':
xy = st->saved_xy;
break;
default: /* Includes CAN and SUB */
break; /* Drop unknown sequence */
}
st->state = st_init;
}
}
break;
case st_tbl:
st->parms[1] = 0;
if (ch == '#')
st->state = st_tblc;
else
st->state = st_init;
break;
case st_tblc:
{
unsigned int n = (unsigned char)ch - '0';
const char *p;
if (n < 10) {
st->parms[1] = st->parms[1] * 10 + n;
if (!--st->parms[0]) {
if (st->parms[1] < console_color_table_size) {
/* Set the color table index */
st->cindex = st->parms[1];
/* See if there are any other attributes we care about */
p = console_color_table[st->parms[1]].ansi;
if (p) {
st->state = st_esc;
__ansi_putchar(ti, '[');
__ansi_putchar(ti, '0');
__ansi_putchar(ti, ';');
while (*p)
__ansi_putchar(ti, *p++);
__ansi_putchar(ti, 'm');
}
}
st->state = st_init;
}
} else {
st->state = st_init;
}
}
break;
}
/* If we fell off the end of the screen, adjust */
if (xy.x >= cols) {
if (st->autowrap) {
xy.x = 0;
xy.y++;
} else {
xy.x = cols - 1;
}
}
while (xy.y >= rows) {
xy.y--;
op->scroll_up(st);
}
/* Update cursor position */
op->set_cursor(xy.x, xy.y, st->cursor);
st->xy = xy;
}