aboutsummaryrefslogtreecommitdiffstats
path: root/com32/libutil/get_key.c
blob: 228253e20e1611490c53f7e744414d738260b94a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#ident "$Id$"
/* ----------------------------------------------------------------------- *
 *   
 *   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>
#include <libutil.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_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)))

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 */

      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];
}