home *** CD-ROM | disk | FTP | other *** search
- #ident "$Id: get_key.c,v 1.5 2005/01/04 07:15:20 hpa Exp $"
- /* ----------------------------------------------------------------------- *
- *
- * Copyright 2004 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>
-
- struct keycode {
- int code;
- int seqlen;
- const unsigned char *seq;
- };
-
- #define MAXLEN 8
- #define CODE(x,y) { x, (sizeof y)-1, 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_INS, "\0\x52"),
- CODE(KEY_DEL, "\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_INS, "\033[2~"),
- CODE(KEY_INS, "\033[@"),
- CODE(KEY_DEL, "\033[3~"),
- };
- #define NCODES ((int)(sizeof keycodes/sizeof(struct keycode)))
-
- 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+CLK_TCK/20 )
- return buffer[0]; /* timeout in sequence */
- else if ( !nc && timeout && lateness > timeout )
- return KEY_NONE; /* timeout before sequence */
-
- 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];
- }
-
-
-
-
-
-