244 lines
6.6 KiB
C
244 lines
6.6 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* get_key.c
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*
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* Get a single key, and try to pick apart function key codes.
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* This doesn't decode anywhere close to all possiblities, but
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* hopefully is enough to be useful.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/times.h>
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#include <getkey.h>
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#include <libutil.h>
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#include <sys/file.h>
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struct keycode {
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int code;
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int seqlen;
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const unsigned char *seq;
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};
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#define CODE(x,y) { x, (sizeof y)-1, (const unsigned char *)(y) }
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static const struct keycode keycodes[] = {
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/* First, the BIOS combined codes */
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CODE(KEY_F1, "\0\x3B"),
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CODE(KEY_F2, "\0\x3C"),
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CODE(KEY_F3, "\0\x3D"),
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CODE(KEY_F4, "\0\x3E"),
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CODE(KEY_F5, "\0\x3F"),
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CODE(KEY_F6, "\0\x40"),
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CODE(KEY_F7, "\0\x41"),
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CODE(KEY_F8, "\0\x42"),
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CODE(KEY_F9, "\0\x43"),
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CODE(KEY_F10, "\0\x44"),
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CODE(KEY_F11, "\0\x85"),
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CODE(KEY_F12, "\0\x86"),
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CODE(KEY_UP, "\0\x48"),
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CODE(KEY_DOWN, "\0\x50"),
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CODE(KEY_LEFT, "\0\x4B"),
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CODE(KEY_RIGHT, "\0\x4D"),
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CODE(KEY_PGUP, "\0\x49"),
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CODE(KEY_PGDN, "\0\x51"),
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CODE(KEY_HOME, "\0\x47"),
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CODE(KEY_END, "\0\x4F"),
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CODE(KEY_INSERT, "\0\x52"),
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CODE(KEY_DELETE, "\0\x53"),
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/* Now, VT/xterm/Linux codes */
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CODE(KEY_F1, "\033[[A"),
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CODE(KEY_F1, "\033OP"),
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CODE(KEY_F2, "\033[[B"),
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CODE(KEY_F2, "\033OQ"),
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CODE(KEY_F3, "\033[[C"),
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CODE(KEY_F3, "\033OR"),
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CODE(KEY_F4, "\033[[D"),
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CODE(KEY_F4, "\033OS"),
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CODE(KEY_F5, "\033[[E"),
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CODE(KEY_F5, "\033[15~"),
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CODE(KEY_F6, "\033[17~"),
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CODE(KEY_F7, "\033[18~"),
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CODE(KEY_F8, "\033[19~"),
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CODE(KEY_F9, "\033[20~"),
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CODE(KEY_F10, "\033[21~"),
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CODE(KEY_F11, "\033[23~"),
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CODE(KEY_F12, "\033[24~"),
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CODE(KEY_UP, "\033[A"),
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CODE(KEY_DOWN, "\033[B"),
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CODE(KEY_LEFT, "\033[D"),
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CODE(KEY_RIGHT, "\033[C"),
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CODE(KEY_PGUP, "\033[5~"),
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CODE(KEY_PGUP, "\033[V"),
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CODE(KEY_PGDN, "\033[6~"),
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CODE(KEY_PGDN, "\033[U"),
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CODE(KEY_HOME, "\033[1~"),
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CODE(KEY_HOME, "\033[H"),
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CODE(KEY_END, "\033[4~"),
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CODE(KEY_END, "\033[F"),
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CODE(KEY_END, "\033OF"),
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CODE(KEY_INSERT, "\033[2~"),
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CODE(KEY_INSERT, "\033[@"),
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CODE(KEY_DELETE, "\033[3~"),
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/* EFI scan codes */
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CODE(KEY_UP, "\0\x01"),
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CODE(KEY_DOWN, "\0\x02"),
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CODE(KEY_RIGHT, "\0\x03"),
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CODE(KEY_LEFT, "\0\x04"),
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CODE(KEY_HOME, "\0\x05"),
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CODE(KEY_END, "\0\x06"),
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CODE(KEY_INSERT, "\0\x07"),
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CODE(KEY_DELETE, "\0\x08"),
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CODE(KEY_PGUP, "\0\x09"),
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CODE(KEY_PGDN, "\0\x0a"),
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CODE(KEY_F1, "\0\x0b"),
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CODE(KEY_F2, "\0\x0c"),
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CODE(KEY_F3, "\0\x0d"),
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CODE(KEY_F4, "\0\x0e"),
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CODE(KEY_F5, "\0\x0f"),
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CODE(KEY_F6, "\0\x10"),
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CODE(KEY_F7, "\0\x11"),
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CODE(KEY_F8, "\0\x12"),
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CODE(KEY_F9, "\0\x13"),
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CODE(KEY_F10, "\0\x14"),
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CODE(KEY_F11, "\0\x15"),
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CODE(KEY_F12, "\0\x16"),
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CODE(KEY_ESC, "\0\x17"),
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};
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#define NCODES ((int)(sizeof keycodes/sizeof(struct keycode)))
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#define KEY_TIMEOUT ((CLK_TCK+9)/10)
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/*
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* Attempt to decode the key sequence in 'buffer'.
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*
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* On success (the data in 'buffer' matches a key code) put the
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* corresponding key code in 'code' and return 0. Return 1 if 'buffer'
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* partially matches a key code, i.e. we need more data before we can
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* make an unambiguous match. Return -1 if the buffer does not contain
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* a key code.
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*/
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int get_key_decode(char *buffer, int nc, int *code)
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{
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const struct keycode *kc;
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int i, rv;
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rv = -1;
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for (i = 0, kc = keycodes; i < NCODES; i++, kc++) {
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if (nc == kc->seqlen && !memcmp(buffer, kc->seq, nc)) {
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*code = kc->code;
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rv = 0;
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break;
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} else if (nc < kc->seqlen && !memcmp(buffer, kc->seq, nc)) {
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rv = 1;
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break;
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}
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}
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return rv;
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}
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#ifdef __COM32__
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extern ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count);
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int raw_read(int fd, void *buf, size_t count)
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{
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(void)fd;
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/*
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* Instead of using the read(2) stdlib function use
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* __rawcon_read() directly since we want a single key and
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* don't want any processing/batching of the user input to
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* occur - we want the raw data.
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*/
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return __rawcon_read(NULL, buf, count);
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}
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#else
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extern int raw_read(int fd, void *buf, size_t count);
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#endif
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__export int get_key(FILE * f, clock_t timeout)
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{
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char buffer[KEY_MAXLEN];
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int nc, rv;
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int another;
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char ch;
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clock_t start;
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int code;
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/* We typically start in the middle of a clock tick */
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if (timeout)
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timeout++;
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nc = 0;
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start = times(NULL);
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do {
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rv = raw_read(fileno(f), &ch, 1);
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if (rv == 0 || (rv == -1 && errno == EAGAIN)) {
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clock_t lateness = times(NULL) - start;
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if (nc && lateness > 1 + KEY_TIMEOUT) {
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if (nc == 1)
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return (unsigned char)buffer[0]; /* timeout */
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else if (timeout && lateness > timeout)
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return KEY_NONE;
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} else if (!nc && timeout && lateness > timeout)
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return KEY_NONE; /* timeout before sequence */
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do_idle();
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another = 1;
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continue;
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}
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start = times(NULL);
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buffer[nc++] = ch;
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another = 0;
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rv = get_key_decode(buffer, nc, &code);
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if (!rv)
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return code;
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else if (rv == 1)
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another = 1;
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} while (another);
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/* We got an unrecognized sequence; return the first character */
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/* We really should remember this and return subsequent characters later */
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return (unsigned char)buffer[0];
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}
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