mirror of
https://github.com/sheumann/hush.git
synced 2024-11-15 12:08:09 +00:00
282 lines
8.6 KiB
C
282 lines
8.6 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) 2008 Rob Landley <rob@landley.net>
|
|
* Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
|
|
int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
|
|
{
|
|
struct pollfd pfd;
|
|
const char *seq;
|
|
int n;
|
|
|
|
/* Known escape sequences for cursor and function keys.
|
|
* See "Xterm Control Sequences"
|
|
* http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
|
|
*/
|
|
static const char esccmds[] ALIGN1 = {
|
|
'O','A' |0x80,KEYCODE_UP ,
|
|
'O','B' |0x80,KEYCODE_DOWN ,
|
|
'O','C' |0x80,KEYCODE_RIGHT ,
|
|
'O','D' |0x80,KEYCODE_LEFT ,
|
|
'O','H' |0x80,KEYCODE_HOME ,
|
|
'O','F' |0x80,KEYCODE_END ,
|
|
#if 0
|
|
'O','P' |0x80,KEYCODE_FUN1 ,
|
|
/* [ESC] ESC O [2] P - [Alt-][Shift-]F1 */
|
|
/* ESC [ O 1 ; 2 P - Shift-F1 */
|
|
/* ESC [ O 1 ; 3 P - Alt-F1 */
|
|
/* ESC [ O 1 ; 4 P - Alt-Shift-F1 */
|
|
/* ESC [ O 1 ; 5 P - Ctrl-F1 */
|
|
/* ESC [ O 1 ; 6 P - Ctrl-Shift-F1 */
|
|
'O','Q' |0x80,KEYCODE_FUN2 ,
|
|
'O','R' |0x80,KEYCODE_FUN3 ,
|
|
'O','S' |0x80,KEYCODE_FUN4 ,
|
|
#endif
|
|
'[','A' |0x80,KEYCODE_UP ,
|
|
'[','B' |0x80,KEYCODE_DOWN ,
|
|
'[','C' |0x80,KEYCODE_RIGHT ,
|
|
'[','D' |0x80,KEYCODE_LEFT ,
|
|
/* ESC [ 1 ; 2 x, where x = A/B/C/D: Shift-<arrow> */
|
|
/* ESC [ 1 ; 3 x, where x = A/B/C/D: Alt-<arrow> - implemented below */
|
|
/* ESC [ 1 ; 4 x, where x = A/B/C/D: Alt-Shift-<arrow> */
|
|
/* ESC [ 1 ; 5 x, where x = A/B/C/D: Ctrl-<arrow> - implemented below */
|
|
/* ESC [ 1 ; 6 x, where x = A/B/C/D: Ctrl-Shift-<arrow> */
|
|
/* ESC [ 1 ; 7 x, where x = A/B/C/D: Ctrl-Alt-<arrow> */
|
|
/* ESC [ 1 ; 8 x, where x = A/B/C/D: Ctrl-Alt-Shift-<arrow> */
|
|
'[','H' |0x80,KEYCODE_HOME , /* xterm */
|
|
'[','F' |0x80,KEYCODE_END , /* xterm */
|
|
/* [ESC] ESC [ [2] H - [Alt-][Shift-]Home (End similarly?) */
|
|
/* '[','Z' |0x80,KEYCODE_SHIFT_TAB, */
|
|
'[','1','~' |0x80,KEYCODE_HOME , /* vt100? linux vt? or what? */
|
|
'[','2','~' |0x80,KEYCODE_INSERT ,
|
|
/* ESC [ 2 ; 3 ~ - Alt-Insert */
|
|
'[','3','~' |0x80,KEYCODE_DELETE ,
|
|
/* [ESC] ESC [ 3 [;2] ~ - [Alt-][Shift-]Delete */
|
|
/* ESC [ 3 ; 3 ~ - Alt-Delete */
|
|
/* ESC [ 3 ; 5 ~ - Ctrl-Delete */
|
|
'[','4','~' |0x80,KEYCODE_END , /* vt100? linux vt? or what? */
|
|
'[','5','~' |0x80,KEYCODE_PAGEUP ,
|
|
/* ESC [ 5 ; 3 ~ - Alt-PgUp */
|
|
/* ESC [ 5 ; 5 ~ - Ctrl-PgUp */
|
|
/* ESC [ 5 ; 7 ~ - Ctrl-Alt-PgUp */
|
|
'[','6','~' |0x80,KEYCODE_PAGEDOWN,
|
|
'[','7','~' |0x80,KEYCODE_HOME , /* vt100? linux vt? or what? */
|
|
'[','8','~' |0x80,KEYCODE_END , /* vt100? linux vt? or what? */
|
|
#if 0
|
|
'[','1','1','~'|0x80,KEYCODE_FUN1 , /* old xterm, deprecated by ESC O P */
|
|
'[','1','2','~'|0x80,KEYCODE_FUN2 , /* old xterm... */
|
|
'[','1','3','~'|0x80,KEYCODE_FUN3 , /* old xterm... */
|
|
'[','1','4','~'|0x80,KEYCODE_FUN4 , /* old xterm... */
|
|
'[','1','5','~'|0x80,KEYCODE_FUN5 ,
|
|
/* [ESC] ESC [ 1 5 [;2] ~ - [Alt-][Shift-]F5 */
|
|
'[','1','7','~'|0x80,KEYCODE_FUN6 ,
|
|
'[','1','8','~'|0x80,KEYCODE_FUN7 ,
|
|
'[','1','9','~'|0x80,KEYCODE_FUN8 ,
|
|
'[','2','0','~'|0x80,KEYCODE_FUN9 ,
|
|
'[','2','1','~'|0x80,KEYCODE_FUN10 ,
|
|
'[','2','3','~'|0x80,KEYCODE_FUN11 ,
|
|
'[','2','4','~'|0x80,KEYCODE_FUN12 ,
|
|
/* ESC [ 2 4 ; 2 ~ - Shift-F12 */
|
|
/* ESC [ 2 4 ; 3 ~ - Alt-F12 */
|
|
/* ESC [ 2 4 ; 4 ~ - Alt-Shift-F12 */
|
|
/* ESC [ 2 4 ; 5 ~ - Ctrl-F12 */
|
|
/* ESC [ 2 4 ; 6 ~ - Ctrl-Shift-F12 */
|
|
#endif
|
|
/* '[','1',';','5','A' |0x80,KEYCODE_CTRL_UP , - unused */
|
|
/* '[','1',';','5','B' |0x80,KEYCODE_CTRL_DOWN , - unused */
|
|
'[','1',';','5','C' |0x80,KEYCODE_CTRL_RIGHT,
|
|
'[','1',';','5','D' |0x80,KEYCODE_CTRL_LEFT ,
|
|
/* '[','1',';','3','A' |0x80,KEYCODE_ALT_UP , - unused */
|
|
/* '[','1',';','3','B' |0x80,KEYCODE_ALT_DOWN , - unused */
|
|
'[','1',';','3','C' |0x80,KEYCODE_ALT_RIGHT,
|
|
'[','1',';','3','D' |0x80,KEYCODE_ALT_LEFT ,
|
|
/* '[','3',';','3','~' |0x80,KEYCODE_ALT_DELETE, - unused */
|
|
0
|
|
};
|
|
|
|
pfd.fd = fd;
|
|
pfd.events = POLLIN;
|
|
|
|
buffer++; /* saved chars counter is in buffer[-1] now */
|
|
|
|
start_over:
|
|
errno = 0;
|
|
n = (unsigned char)buffer[-1];
|
|
if (n == 0) {
|
|
/* If no data, wait for input.
|
|
* If requested, wait TIMEOUT ms. TIMEOUT = -1 is useful
|
|
* if fd can be in non-blocking mode.
|
|
*/
|
|
if (timeout >= -1) {
|
|
if (safe_poll(&pfd, 1, timeout) == 0) {
|
|
/* Timed out */
|
|
errno = EAGAIN;
|
|
return -1;
|
|
}
|
|
}
|
|
/* It is tempting to read more than one byte here,
|
|
* but it breaks pasting. Example: at shell prompt,
|
|
* user presses "c","a","t" and then pastes "\nline\n".
|
|
* When we were reading 3 bytes here, we were eating
|
|
* "li" too, and cat was getting wrong input.
|
|
*/
|
|
n = safe_read(fd, buffer, 1);
|
|
if (n <= 0)
|
|
return -1;
|
|
}
|
|
|
|
{
|
|
unsigned char c = buffer[0];
|
|
n--;
|
|
if (n)
|
|
memmove(buffer, buffer + 1, n);
|
|
/* Only ESC starts ESC sequences */
|
|
if (c != 27) {
|
|
buffer[-1] = n;
|
|
return c;
|
|
}
|
|
}
|
|
|
|
/* Loop through known ESC sequences */
|
|
seq = esccmds;
|
|
while (*seq != '\0') {
|
|
/* n - position in sequence we did not read yet */
|
|
int i = 0; /* position in sequence to compare */
|
|
|
|
/* Loop through chars in this sequence */
|
|
while (1) {
|
|
/* So far escape sequence matched up to [i-1] */
|
|
if (n <= i) {
|
|
/* Need more chars, read another one if it wouldn't block.
|
|
* Note that escape sequences come in as a unit,
|
|
* so if we block for long it's not really an escape sequence.
|
|
* Timeout is needed to reconnect escape sequences
|
|
* split up by transmission over a serial console. */
|
|
if (safe_poll(&pfd, 1, 50) == 0) {
|
|
/* No more data!
|
|
* Array is sorted from shortest to longest,
|
|
* we can't match anything later in array -
|
|
* anything later is longer than this seq.
|
|
* Break out of both loops. */
|
|
goto got_all;
|
|
}
|
|
errno = 0;
|
|
if (safe_read(fd, buffer + n, 1) <= 0) {
|
|
/* If EAGAIN, then fd is O_NONBLOCK and poll lied:
|
|
* in fact, there is no data. */
|
|
if (errno != EAGAIN) {
|
|
/* otherwise: it's EOF/error */
|
|
buffer[-1] = 0;
|
|
return -1;
|
|
}
|
|
goto got_all;
|
|
}
|
|
n++;
|
|
}
|
|
if (buffer[i] != (seq[i] & 0x7f)) {
|
|
/* This seq doesn't match, go to next */
|
|
seq += i;
|
|
/* Forward to last char */
|
|
while (!(*seq & 0x80))
|
|
seq++;
|
|
/* Skip it and the keycode which follows */
|
|
seq += 2;
|
|
break;
|
|
}
|
|
if (seq[i] & 0x80) {
|
|
/* Entire seq matched */
|
|
n = 0;
|
|
/* n -= i; memmove(...);
|
|
* would be more correct,
|
|
* but we never read ahead that much,
|
|
* and n == i here. */
|
|
buffer[-1] = 0;
|
|
return (signed char)seq[i+1];
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
/* We did not find matching sequence.
|
|
* We possibly read and stored more input in buffer[] by now.
|
|
* n = bytes read. Try to read more until we time out.
|
|
*/
|
|
while (n < KEYCODE_BUFFER_SIZE-1) { /* 1 for count byte at buffer[-1] */
|
|
if (safe_poll(&pfd, 1, 50) == 0) {
|
|
/* No more data! */
|
|
break;
|
|
}
|
|
errno = 0;
|
|
if (safe_read(fd, buffer + n, 1) <= 0) {
|
|
/* If EAGAIN, then fd is O_NONBLOCK and poll lied:
|
|
* in fact, there is no data. */
|
|
if (errno != EAGAIN) {
|
|
/* otherwise: it's EOF/error */
|
|
buffer[-1] = 0;
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
n++;
|
|
/* Try to decipher "ESC [ NNN ; NNN R" sequence */
|
|
if ((ENABLE_FEATURE_EDITING_ASK_TERMINAL
|
|
|| ENABLE_FEATURE_VI_ASK_TERMINAL
|
|
|| ENABLE_FEATURE_LESS_ASK_TERMINAL
|
|
)
|
|
&& n >= 5
|
|
&& buffer[0] == '['
|
|
&& buffer[n-1] == 'R'
|
|
&& isdigit(buffer[1])
|
|
) {
|
|
char *end;
|
|
unsigned long row, col;
|
|
|
|
row = strtoul(buffer + 1, &end, 10);
|
|
if (*end != ';' || !isdigit(end[1]))
|
|
continue;
|
|
col = strtoul(end + 1, &end, 10);
|
|
if (*end != 'R')
|
|
continue;
|
|
if (row < 1 || col < 1 || (row | col) > 0x7fff)
|
|
continue;
|
|
|
|
buffer[-1] = 0;
|
|
/* Pack into "1 <row15bits> <col16bits>" 32-bit sequence */
|
|
col |= (((-1 << 15) | row) << 16);
|
|
/* Return it in high-order word */
|
|
return ((int64_t) col << 32) | (uint32_t)KEYCODE_CURSOR_POS;
|
|
}
|
|
}
|
|
got_all:
|
|
|
|
if (n <= 1) {
|
|
/* Alt-x is usually returned as ESC x.
|
|
* Report ESC, x is remembered for the next call.
|
|
*/
|
|
buffer[-1] = n;
|
|
return 27;
|
|
}
|
|
|
|
/* We were doing "buffer[-1] = n; return c;" here, but this results
|
|
* in unknown key sequences being interpreted as ESC + garbage.
|
|
* This was not useful. Pretend there was no key pressed,
|
|
* go and wait for a new keypress:
|
|
*/
|
|
buffer[-1] = 0;
|
|
goto start_over;
|
|
}
|
|
|
|
void FAST_FUNC read_key_ungets(char *buffer, const char *str, unsigned len)
|
|
{
|
|
unsigned cur_len = (unsigned char)buffer[0];
|
|
if (len > KEYCODE_BUFFER_SIZE-1 - cur_len)
|
|
len = KEYCODE_BUFFER_SIZE-1 - cur_len;
|
|
memcpy(buffer + 1 + cur_len, str, len);
|
|
buffer[0] += len;
|
|
}
|