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Bare metal VGA: implement "status report" escape codes (#613)

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* Bare metal VGA: implement "status report" escape codes
* Minor fix to pseudoteletypewriter code

Co-authored-by: tkchia <tkchia-cosmo@gmx.com>
This commit is contained in:
tkchia 2022-09-13 17:14:10 +08:00 • committed by GitHub
parent e0fabd1d49
commit df08b541af
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8 changed files with 113 additions and 10 deletions
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13
libc/vga/tty.c
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@ -536,15 +536,18 @@ static void TtyDeleteLines(struct Tty *tty) {
}
static void TtyReportDeviceStatus(struct Tty *tty) {
_TtyWriteInput(tty, "\e[0n", 4);
static const char report[] = "\e[0n";
_TtyWriteInput(tty, report, strlen(report));
}
static void TtyReportPreferredVtType(struct Tty *tty) {
_TtyWriteInput(tty, "\e[?1;0c", 4);
static const char report[] = "\e[?1;0c";
_TtyWriteInput(tty, report, strlen(report));
}
static void TtyReportPreferredVtIdentity(struct Tty *tty) {
_TtyWriteInput(tty, "\e/Z", 4);
static const char report[] = "\e/Z";
_TtyWriteInput(tty, report, strlen(report));
}
static void TtyBell(struct Tty *tty) {
@ -1148,9 +1151,11 @@ ssize_t _TtyWriteInput(struct Tty *tty, const void *data, size_t n) {
if (cr && i < sizeof tty->input.p) {
p[i++] = '\n';
}
#ifdef VGA_PERSNICKETY_STATUS
if (!(tty->conf & kTtyNoecho)) {
_TtyWrite(tty, p + tty->input.i, i - tty->input.i);
}
#endif
tty->input.i = i;
return n;
}
@ -1159,6 +1164,7 @@ ssize_t _TtyRead(struct Tty *tty, void *buf, size_t size) {
char *p;
size_t n;
n = MIN(size, tty->input.i);
#ifdef VGA_PERSNICKETY_STATUS
if (!(tty->conf & kTtyNocanon)) {
if ((p = memchr(tty->input.p, '\n', n))) {
n = MIN(n, tty->input.p - p + 1);
@ -1166,6 +1172,7 @@ ssize_t _TtyRead(struct Tty *tty, void *buf, size_t size) {
n = 0;
}
}
#endif
memcpy(buf, tty->input.p, n);
memcpy(tty->input.p, tty->input.p + n, tty->input.i - n);
tty->input.i -= n;