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Try to guess if the window is UTF-8 by outputting a three-byte UTF-8 wide character and seeing how much the cursor moves. Currently tries to figure out if this works by some stupid checks on the terminal, these need to be rethought. Also might be better using a width 1 character rather than width 2.

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This commit is contained in:
Nicholas Marriott
2009-05-19 16:08:35 +00:00
parent 5db59a0d20
commit 6db7bd6791
4 changed files with 102 additions and 8 deletions
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89
tty.c
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@ -1,4 +1,4 @@
/* $Id: tty.c,v 1.98 2009-05-14 16:21:55 nicm Exp $ */
/* $Id: tty.c,v 1.99 2009-05-19 16:08:35 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -136,6 +136,8 @@ tty_start_tty(struct tty *tty)
int what;
#endif
tty_detect_utf8(tty);
if (tcgetattr(tty->fd, &tty->tio) != 0)
fatal("tcgetattr failed");
memcpy(&tio, &tty->tio, sizeof tio);
@ -197,15 +199,96 @@ tty_stop_tty(struct tty *tty)
tty_raw(tty, tty_term_string2(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
tty_raw(tty, tty_term_string(tty->term, TTYC_SGR0));
tty_raw(tty, tty_term_string(tty->term, TTYC_CLEAR));
tty_raw(tty, tty_term_string(tty->term, TTYC_RMKX));
tty_raw(tty, tty_term_string(tty->term, TTYC_RMCUP));
tty_raw(tty, tty_term_string(tty->term, TTYC_CLEAR));
tty_raw(tty, tty_term_string(tty->term, TTYC_CNORM));
if (tty_term_has(tty->term, TTYC_KMOUS))
tty_raw(tty, "\033[?1000l");
}
void
tty_detect_utf8(struct tty *tty)
{
struct pollfd pfd;
char buf[7];
size_t len;
ssize_t n;
int nfds;
struct termios tio, old_tio;
#ifdef TIOCFLUSH
int what;
#endif
if (tty->flags & TTY_UTF8)
return;
/*
* If the terminal looks reasonably likely to support this, try to
* write a three-byte UTF-8 wide character to the terminal, then read
* the cursor position.
*
* XXX This entire function is a hack.
*/
/* Check if the terminal looks sort of vt100. */
if (strstr(tty_term_string(tty->term, TTYC_CLEAR), "[2J") == NULL ||
strstr(tty_term_string(tty->term, TTYC_CUP), "H") == NULL)
return;
if (tcgetattr(tty->fd, &old_tio) != 0)
fatal("tcgetattr failed");
cfmakeraw(&tio);
if (tcsetattr(tty->fd, TCSANOW, &tio) != 0)
fatal("tcsetattr failed");
#ifdef TIOCFLUSH
what = 0;
if (ioctl(tty->fd, TIOCFLUSH, &what) != 0)
fatal("ioctl(TIOCFLUSH)");
#endif
#define UTF8_TEST_DATA "\033[H\357\277\246\033[6n"
if (write(tty->fd, UTF8_TEST_DATA, (sizeof UTF8_TEST_DATA) - 1) == -1)
fatal("write failed");
#undef UTF8_TEST_DATA
len = 0;
for (;;) {
pfd.fd = tty->fd;
pfd.events = POLLIN;
nfds = poll(&pfd, 1, 500);
if (nfds == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (nfds == 0)
break;
#ifdef HAVE_POLL
if (pfd.revents & (POLLERR|POLLNVAL|POLLHUP))
break;
#endif
if (!(pfd.revents & POLLIN))
continue;
if ((n = read(tty->fd, buf + len, 1)) != 1)
break;
buf[++len] = '\0';
if (len == (sizeof buf) - 1) {
if (strcmp(buf, "\033[1;3R") == 0)
tty->flags |= TTY_UTF8;
break;
}
}
if (tcsetattr(tty->fd, TCSANOW, &old_tio) != 0)
fatal("tcsetattr failed");
}
void
tty_fill_acs(struct tty *tty)
{