-
Notifications
You must be signed in to change notification settings - Fork 0
/
key.c
218 lines (198 loc) · 4.03 KB
/
key.c
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
* int KeyInit (map, flushproc)
* struct KeyMap *map;
* void (*flushproc) (void);
*
* - set key map table.
* Flushproc is called before actual reading from terminal.
* Returns 1 if ok else 0.
*
* int KeyGet ()
*
* - reads key from terminal.
* Returns key (always >= 0).
*
* int KeyGetChar ()
*
* - reads char from terminal.
* Returns char (always >= 0).
*/
#include <stdlib.h>
#include <string.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "scr.h"
static struct KeyMap *km;
static void (*flush) (void);
#include <setjmp.h>
#include <signal.h>
#define NKEY 100
static jmp_buf wakeup;
static keyback;
static unsigned oldalarm;
static cyrinput;
extern char VCyrInputTable [];
/*
* Compare keys. Used in call to qsort.
* Return -1, 0, 1 iff a is less, equal or greater than b.
* First, check if there is ->str.
* Then compare lengths, then strings.
* If equal, check ->tcap field.
*/
static int compkeys (const void *arg1, const void *arg2)
{
const struct KeyMap *a = arg1;
const struct KeyMap *b = arg2;
register cmp;
if (! a->str) {
if (! b->str)
return (0);
return (1);
}
if (! b->str)
return (-1);
cmp = strcmp (a->str, b->str);
if (cmp)
return (cmp);
if (! a->tcap) {
if (! b->tcap)
return (0);
return (1);
}
if (! b->tcap)
return (-1);
return (0);
}
void KeyInit (struct KeyMap *map, void (*flushproc) (void))
{
struct CapTab tab [NKEY];
register struct KeyMap *kp;
register struct CapTab *t;
memset (tab, 0, sizeof(tab));
km = map;
flush = flushproc;
for (t=tab, kp=km; kp->val && t<tab+NKEY-1; ++kp, ++t) {
if (! kp->tcap)
continue;
memcpy (t->tname, kp->tcap, sizeof (t->tname));
t->ttype = CAPSTR;
t->tdef = 0;
t->tc = 0;
t->ti = 0;
t->ts = &kp->str;
}
kp->val = 0;
t->tname[0] = 0;
CapGet (tab);
qsort ((char *) km, (unsigned) (kp - km), sizeof (km[0]), compkeys);
#ifdef notdef
{
register struct KeyMap *p;
for (p=km; p<kp; ++p)
if (kp->str)
printf ("'\\%03o%s' -> %x\n", p->str[0], p->str+1, p->val);
}
#endif
}
int KeyGetChar ()
{
char c;
while (read (0, &c, 1) != 1)
if (! isatty (0))
exit (0);
return (c & 0377);
}
static RETSIGTYPE badkey ()
{
alarm (oldalarm);
longjmp (wakeup, -1);
}
static int nmgetch (struct KeyMap *kp)
{
register match, c;
register struct KeyMap *lp;
for (match=1; ; ++match) {
if (! kp->str [match])
return (kp->val);
c = KeyGetChar ();
if (kp->str [match] == c)
continue;
lp = kp;
do {
++kp;
if (! kp->str)
goto unknown;
} while (kp->str [match] != c);
if (lp->str [match-1] != kp->str [match-1])
goto unknown;
if (match>1 && strncmp (lp->str, kp->str, match-1))
goto unknown;
}
unknown:
alarm (oldalarm);
longjmp (wakeup, 1);
/* NOTREACHED */
}
int KeyGet ()
{
static struct KeyMap *kp;
static int c, j;
if (keyback) {
c = keyback;
keyback = 0;
return (c);
}
if (flush)
(*flush) ();
nextkey:
c = KeyGetChar ();
for (kp=km; kp->str; ++kp)
if ((char) c == kp->str[0])
break;
if (! kp->str) {
#ifdef DOC
if (c == cntrl ('_')) {
_prscreen ();
goto nextkey;
}
#endif
/*
* Handle cyrillic input.
* ^N turns on cyrillic input mode,
* after that all input characters
* in range ' '...'~' must be recoded
* by special cyrillic input table.
* It is specified by Ct termcap descriptor.
* ^O turns off cyrillic input mode.
*/
if (c == cntrl ('N')) {
cyrinput = 1;
goto nextkey;
} else if (c == cntrl ('O')) {
cyrinput = 0;
goto nextkey;
} else if (cyrinput && c>=' ' && c<='~')
c = VCyrInputTable [c - ' '] & 0xff;
return (c);
}
if (! kp->str [1])
return (kp->val);
/* look for escape sequence */
if ((j = setjmp (wakeup))) {
/* time out or unknown escape sequence */
TtyFlushInput ();
if (j < 0)
return (c);
goto nextkey;
}
signal (SIGALRM, badkey);
oldalarm = alarm (2);
c = nmgetch (kp);
alarm (oldalarm);
return (c);
}
void KeyUnget (int key)
{
keyback = key;
}