blob: f028f5e97f6d7f190a04d230e59a2bf630daa9f9 [file] [log] [blame]
/* interestingtimes.c - cursor control
*
* Copyright 2015 Rob Landley <rob@landley.net>
*/
#include "toys.h"
int xgettty(void)
{
int i, j;
for (i = 0; i<3; i++) if (isatty(j = (i+1)%3)) return j;
return xopen("/dev/tty", O_RDWR);
}
// Quick and dirty query size of terminal, doesn't do ANSI probe fallback.
// set x=80 y=25 before calling to provide defaults. Returns 0 if couldn't
// determine size.
int terminal_size(unsigned *xx, unsigned *yy)
{
struct winsize ws;
unsigned i, x = 0, y = 0;
char *s;
// stdin, stdout, stderr
for (i=0; i<3; i++) {
memset(&ws, 0, sizeof(ws));
if (!ioctl(i, TIOCGWINSZ, &ws)) {
if (ws.ws_col) x = ws.ws_col;
if (ws.ws_row) y = ws.ws_row;
break;
}
}
s = getenv("COLUMNS");
if (s) sscanf(s, "%u", &x);
s = getenv("LINES");
if (s) sscanf(s, "%u", &y);
// Never return 0 for either value, leave it at default instead.
if (xx && x) *xx = x;
if (yy && y) *yy = y;
return x || y;
}
// Query terminal size, sending ANSI probe if necesary. (Probe queries xterm
// size through serial connection, when local TTY doesn't know but remote does.)
// Returns 0 if ANSI probe sent, 1 if size determined from tty or environment
int terminal_probesize(unsigned *xx, unsigned *yy)
{
if (terminal_size(xx, yy) && (!xx || *xx) && (!yy || *yy)) return 1;
// Send probe: bookmark cursor position, jump to bottom right,
// query position, return cursor to bookmarked position.
xprintf("\e[s\e[999C\e[999B\e[6n\e[u");
return 0;
}
// Wrapper that parses results from ANSI probe to update screensize.
// Otherwise acts like scan_key()
int scan_key_getsize(char *scratch, int miliwait, unsigned *xx, unsigned *yy)
{
int key;
if (512&(key = scan_key(scratch, miliwait))) {
if (key>0) {
if (xx) *xx = (key>>10)&1023;
if (yy) *yy = (key>>20)&1023;
return -3;
}
}
return key;
}
// Reset terminal to known state, saving copy of old state if old != NULL.
int set_terminal(int fd, int raw, struct termios *old)
{
struct termios termio;
// Fetch local copy of old terminfo, and copy struct contents to *old if set
if (!tcgetattr(fd, &termio) && old) *old = termio;
// the following are the bits set for an xterm. Linux text mode TTYs by
// default add two additional bits that only matter for serial processing
// (turn serial line break into an interrupt, and XON/XOFF flow control)
// Any key unblocks output, swap CR and NL on input
termio.c_iflag = IXANY|ICRNL|INLCR;
if (toys.which->flags & TOYFLAG_LOCALE) termio.c_iflag |= IUTF8;
// Output appends CR to NL, does magic undocumented postprocessing
termio.c_oflag = ONLCR|OPOST;
// Leave serial port speed alone
// termio.c_cflag = C_READ|CS8|EXTB;
// Generate signals, input entire line at once, echo output
// erase, line kill, escape control characters with ^
// erase line char at a time
// "extended" behavior: ctrl-V quotes next char, ctrl-R reprints unread chars,
// ctrl-W erases word
termio.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN;
if (raw) cfmakeraw(&termio);
return tcsetattr(fd, TCSANOW, &termio);
}
void xset_terminal(int fd, int raw, struct termios *old)
{
if (-1 == set_terminal(fd, raw, old)) perror_exit("bad tty fd#%d", fd);
}
struct scan_key_list {
char *name, *seq;
} static const scan_key_list[] = TAGGED_ARRAY(KEY,
// up down right left pgup pgdn home end ins
{"UP", "\033[A"}, {"DOWN", "\033[B"}, {"RIGHT", "\033[C"}, {"LEFT", "\033[D"},
{"PGUP", "\033[5~"}, {"PGDN", "\033[6~"}, {"HOME", "\033OH"},
{"END", "\033OF"}, {"INSERT", "\033[2~"},
{"F1", "\033OP"}, {"F2", "\033OQ"}, {"F3", "\033OR"}, {"F4", "\033OS"},
{"F5", "\033[15~"}, {"F6", "\033[17~"}, {"F7", "\033[18~"},
{"F8", "\033[19~"}, {"F9", "\033[20~"},
{"SUP", "\033[1;2A"}, {"AUP", "\033[1;3A"}, {"CUP", "\033[1;5A"},
{"SDOWN", "\033[1;2B"}, {"ADOWN", "\033[1;3B"}, {"CDOWN", "\033[1;5B"},
{"SRIGHT", "\033[1;2C"}, {"ARIGHT", "\033[1;3C"}, {"CRIGHT", "\033[1;5C"},
{"SLEFT", "\033[1;2D"}, {"ALEFT", "\033[1;3D"}, {"CLEFT", "\033[1;5D"},
{"SF1", "\033O1;2P"}, {"AF1", "\033O1;3P"}, {"CF1", "\033[1;5P"}
);
// Scan stdin for a keypress, parsing known escape sequences
// Blocks for miliwait miliseconds, none 0, forever if -1
// Returns: 0-255=literal, -1=EOF, -2=TIMEOUT, 256-...=index into scan_key_list
// >512 is x<<9+y<<21
// scratch space is necessary because last char of !seq could start new seq
// Zero out first byte of scratch before first call to scan_key
// block=0 allows fetching multiple characters before updating display
int scan_key(char *scratch, int miliwait)
{
struct pollfd pfd;
int maybe, i, j;
char *test;
for (;;) {
pfd.fd = 0;
pfd.events = POLLIN;
pfd.revents = 0;
maybe = 0;
if (*scratch) {
int pos[6];
unsigned x, y;
// Check for return from terminal size probe
memset(pos, 0, 6*sizeof(int));
scratch[(1+*scratch)&15] = 0;
sscanf(scratch+1, "\033%n[%n%3u%n;%n%3u%nR%n", pos, pos+1, &y,
pos+2, pos+3, &x, pos+4, pos+5);
if (pos[5]) {
// Recognized X/Y position, consume and return
*scratch = 0;
return 512+(x<<10)+(y<<20);
} else for (i=0; i<6; i++) if (pos[i]==*scratch) maybe = 1;
// Check sequences
for (i = 0; i<ARRAY_LEN(scan_key_list); i++) {
test = scan_key_list[i].seq;
for (j = 0; j<*scratch; j++) if (scratch[j+1] != test[j]) break;
if (j == *scratch) {
maybe = 1;
if (!test[j]) {
// We recognized current sequence: consume and return
*scratch = 0;
return 256+i;
}
}
}
// If current data can't be a known sequence, return next raw char
if (!maybe) break;
}
// Need more data to decide
// 30 miliseconds is about the gap between characters at 300 baud
if (maybe || miliwait != -1)
if (!xpoll(&pfd, 1, maybe ? 30 : miliwait)) break;
// Read 1 byte so we don't overshoot sequence match. (We can deviate
// and fail to match, but match consumes entire buffer.)
if (toys.signal || 1 != read(0, scratch+1+*scratch, 1))
return toys.signal ? -3 : -1;
++*scratch;
}
// Was not a sequence
if (!*scratch) return -2;
i = scratch[1];
if (--*scratch) memmove(scratch+1, scratch+2, *scratch);
return i;
}
void tty_esc(char *s)
{
printf("\033[%s", s);
}
void tty_jump(int x, int y)
{
char s[32];
sprintf(s, "%d;%dH", y+1, x+1);
tty_esc(s);
}
void tty_reset(void)
{
set_terminal(0, 0, 0);
tty_esc("?25h");
tty_esc("0m");
tty_jump(0, 999);
tty_esc("K");
fflush(0);
}
// If you call set_terminal(), use sigatexit(tty_sigreset);
void tty_sigreset(int i)
{
tty_reset();
_exit(i ? 128+i : 0);
}