* Copyright (C) 2008 Rob Landley <rob@landley.net>
* Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "libbb.h"
-int64_t FAST_FUNC read_key(int fd, char *buffer)
+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 */
+ /* Known escape sequences for cursor and function keys.
+ * See "Xterm Control Sequences"
+ * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * Array should be sorted from shortest to longest.
+ */
static const char esccmds[] ALIGN1 = {
+ '\x7f' |0x80,KEYCODE_ALT_BACKSPACE,
+ '\b' |0x80,KEYCODE_ALT_BACKSPACE,
+ 'd' |0x80,KEYCODE_ALT_D ,
+ /* lineedit mimics bash: Alt-f and Alt-b are forward/backward
+ * word jumps. We cheat here and make them return ALT_LEFT/RIGHT
+ * keycodes. This way, lineedit need no special code to handle them.
+ * If we'll need to distinguish them, introduce new ALT_F/B keycodes,
+ * and update lineedit to react to them.
+ */
+ 'f' |0x80,KEYCODE_ALT_RIGHT,
+ 'b' |0x80,KEYCODE_ALT_LEFT,
'O','A' |0x80,KEYCODE_UP ,
'O','B' |0x80,KEYCODE_DOWN ,
'O','C' |0x80,KEYCODE_RIGHT ,
'[','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> */
+ /* 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 */
- /* [ESC] ESC [ [2] H - [Alt-][Shift-]Home */
'[','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 */
'[','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 ,
- '[','1','2','~'|0x80,KEYCODE_FUN2 ,
- '[','1','3','~'|0x80,KEYCODE_FUN3 ,
- '[','1','4','~'|0x80,KEYCODE_FUN4 ,
+ '[','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',';','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
- /* ESC [ Z - Shift-Tab */
};
+ 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, block waiting for input.
- * It is tempting to read more than one byte here,
+ /* 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
}
/* Loop through known ESC sequences */
- pfd.fd = fd;
- pfd.events = POLLIN;
seq = esccmds;
while (*seq != '\0') {
/* n - position in sequence we did not read yet */
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:
return 27;
}
- /* Try to decipher "ESC [ NNN ; NNN R" sequence */
- if (ENABLE_FEATURE_EDITING_ASK_TERMINAL
- && n >= 5
- && buffer[0] == '['
- && isdigit(buffer[1])
- && buffer[n-1] == 'R'
- ) {
- char *end;
- unsigned long row, col;
-
- row = strtoul(buffer + 1, &end, 10);
- if (*end != ';' || !isdigit(end[1]))
- goto not_R;
- col = strtoul(end + 1, &end, 10);
- if (*end != 'R')
- goto not_R;
- if (row < 1 || col < 1 || (row | col) > 0x7fff)
- goto not_R;
-
- 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;
- }
- not_R:
-
/* 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,
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;
+}
projects / oweals / busybox.git / blobdiff