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
219
220
221
222
223
224
225
|
/** \file input_common.c
Implementation file for the low level input library
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <wchar.h>
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "input_common.h"
#include "env_universal.h"
/**
Time in milliseconds to wait for another byte to be available for
reading after \e is read before assuming that escape key was
pressed, and not an escape sequence.
*/
#define WAIT_ON_ESCAPE 10
/**
Characters that have been read and returned by the sequence matching code
*/
static wint_t lookahead_arr[32];
/**
Number of entries in lookahead_arr
*/
static int lookahead_count = 0;
/**
Callback function for handling interrupts on reading
*/
static int (*interrupt_handler)();
void input_common_init( int (*ih)() )
{
interrupt_handler = ih;
}
void input_common_destroy()
{
}
/**
Internal function used by input_common_readch to read one byte from fd 1. This function should only be called by
input_common_readch().
*/
static wint_t readb()
{
unsigned char arr[1];
int do_loop = 0;
do
{
fd_set fd;
int fd_max=1;
int res;
FD_ZERO( &fd );
FD_SET( 0, &fd );
if( env_universal_server.fd > 0 )
{
FD_SET( env_universal_server.fd, &fd );
fd_max = env_universal_server.fd+1;
}
do_loop = 0;
res = select( fd_max, &fd, 0, 0, 0 );
if( res==-1 )
{
switch( errno )
{
case EINTR:
case EAGAIN:
{
if( interrupt_handler )
{
int res = interrupt_handler();
if( res )
return res;
}
do_loop = 1;
break;
}
default:
{
debug( 0, L"Error while reading input from keyboard, shutting down" );
wperror(L"read");
exit(1);
}
}
}
else
{
if( env_universal_server.fd > 0 )
{
if( FD_ISSET( env_universal_server.fd, &fd ) )
{
debug( 3, L"Wake up on universal variable event" );
env_universal_read_all();
debug( 3, L"Return R_NULL" );
return R_NULL;
}
}
if( FD_ISSET( 0, &fd ) )
{
if( read_blocked( 0, arr, 1 ) == -1 )
{
debug( 0, L"Error while reading input from keyboard, shutting down" );
wperror(L"read");
exit(1);
}
do_loop = 0;
}
}
}
while( do_loop );
return arr[0];
}
wchar_t input_common_readch( int timed )
{
if( lookahead_count == 0 )
{
if( timed )
{
int count;
fd_set fds;
struct timeval tm=
{
0,
1000 * WAIT_ON_ESCAPE
}
;
FD_ZERO( &fds );
FD_SET( 0, &fds );
count = select(1, &fds, 0, 0, &tm);
switch( count )
{
case 0:
return WEOF;
case -1:
return WEOF;
break;
default:
break;
}
}
wchar_t res;
static mbstate_t state;
while(1)
{
wint_t b = readb();
char bb;
int sz;
if( b == R_NULL )
return R_NULL;
bb=b;
sz = mbrtowc( &res, &bb, 1, &state );
switch( sz )
{
case -1:
memset (&state, '\0', sizeof (state));
debug( 2, L"Illegal input" );
return R_NULL;
case -2:
break;
case 0:
return 0;
default:
return res;
}
}
}
else
{
if( !timed )
{
while( (lookahead_count >= 0) && (lookahead_arr[lookahead_count-1] == WEOF) )
lookahead_count--;
if( lookahead_count == 0 )
return input_common_readch(0);
}
return lookahead_arr[--lookahead_count];
}
}
void input_common_unreadch( wint_t ch )
{
lookahead_arr[lookahead_count++] = ch;
}
|
