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/* ----------------------------------------------------------------------- *
*
* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* get_key.c
*
* Get a single key, and try to pick apart function key codes.
* This doesn't decode anywhere close to all possiblities, but
* hopefully is enough to be useful.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <sys/times.h>
#include <getkey.h>
#include <libutil.h>
struct keycode {
int code;
int seqlen;
const unsigned char *seq;
};
#define MAXLEN 8
#define CODE(x,y) { x, (sizeof y)-1, (const unsigned char *)(y) }
static const struct keycode keycodes[] = {
/* First, the BIOS combined codes */
CODE(KEY_F1, "\0\x3B"),
CODE(KEY_F2, "\0\x3C"),
CODE(KEY_F3, "\0\x3D"),
CODE(KEY_F4, "\0\x3E"),
CODE(KEY_F5, "\0\x3F"),
CODE(KEY_F6, "\0\x40"),
CODE(KEY_F7, "\0\x41"),
CODE(KEY_F8, "\0\x42"),
CODE(KEY_F9, "\0\x43"),
CODE(KEY_F10, "\0\x44"),
CODE(KEY_F11, "\0\x85"),
CODE(KEY_F12, "\0\x86"),
CODE(KEY_UP, "\0\x48"),
CODE(KEY_DOWN, "\0\x50"),
CODE(KEY_LEFT, "\0\x4B"),
CODE(KEY_RIGHT, "\0\x4D"),
CODE(KEY_PGUP, "\0\x49"),
CODE(KEY_PGDN, "\0\x51"),
CODE(KEY_HOME, "\0\x47"),
CODE(KEY_END, "\0\x4F"),
CODE(KEY_INSERT, "\0\x52"),
CODE(KEY_DELETE, "\0\x53"),
/* Now, VT/xterm/Linux codes */
CODE(KEY_F1, "\033[[A"),
CODE(KEY_F1, "\033OP"),
CODE(KEY_F2, "\033[[B"),
CODE(KEY_F2, "\033OQ"),
CODE(KEY_F3, "\033[[C"),
CODE(KEY_F3, "\033OR"),
CODE(KEY_F4, "\033[[D"),
CODE(KEY_F4, "\033OS"),
CODE(KEY_F5, "\033[[E"),
CODE(KEY_F5, "\033[15~"),
CODE(KEY_F6, "\033[17~"),
CODE(KEY_F7, "\033[18~"),
CODE(KEY_F8, "\033[19~"),
CODE(KEY_F9, "\033[20~"),
CODE(KEY_F10, "\033[21~"),
CODE(KEY_F11, "\033[23~"),
CODE(KEY_F12, "\033[24~"),
CODE(KEY_UP, "\033[A"),
CODE(KEY_DOWN, "\033[B"),
CODE(KEY_LEFT, "\033[D"),
CODE(KEY_RIGHT, "\033[C"),
CODE(KEY_PGUP, "\033[5~"),
CODE(KEY_PGUP, "\033[V"),
CODE(KEY_PGDN, "\033[6~"),
CODE(KEY_PGDN, "\033[U"),
CODE(KEY_HOME, "\033[1~"),
CODE(KEY_HOME, "\033[H"),
CODE(KEY_END, "\033[4~"),
CODE(KEY_END, "\033[F"),
CODE(KEY_END, "\033OF"),
CODE(KEY_INSERT, "\033[2~"),
CODE(KEY_INSERT, "\033[@"),
CODE(KEY_DELETE, "\033[3~"),
};
#define NCODES ((int)(sizeof keycodes/sizeof(struct keycode)))
#define KEY_TIMEOUT ((CLK_TCK+9)/10)
int get_key(FILE * f, clock_t timeout)
{
unsigned char buffer[MAXLEN];
int nc, i, rv;
const struct keycode *kc;
int another;
unsigned char ch;
clock_t start;
/* We typically start in the middle of a clock tick */
if (timeout)
timeout++;
nc = 0;
start = times(NULL);
do {
rv = read(fileno(f), &ch, 1);
if (rv == 0 || (rv == -1 && errno == EAGAIN)) {
clock_t lateness = times(NULL) - start;
if (nc && lateness > 1 + KEY_TIMEOUT) {
if (nc == 1)
return buffer[0]; /* timeout in sequence */
else if (timeout && lateness > timeout)
return KEY_NONE;
} else if (!nc && timeout && lateness > timeout)
return KEY_NONE; /* timeout before sequence */
do_idle();
another = 1;
continue;
}
start = times(NULL);
buffer[nc++] = ch;
another = 0;
for (i = 0, kc = keycodes; i < NCODES; i++, kc++) {
if (nc == kc->seqlen && !memcmp(buffer, kc->seq, nc))
return kc->code;
else if (nc < kc->seqlen && !memcmp(buffer, kc->seq, nc)) {
another = 1;
break;
}
}
} while (another);
/* We got an unrecognized sequence; return the first character */
/* We really should remember this and return subsequent characters later */
return buffer[0];
}
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