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
|
#include "imtable.h"
#define IM_BUFFER_LEN 32
#define ENTER_KEY 0x0D
#define BACKSPACE_KEY 0x7F
//#define BACKSPACE_KEY '+'
//setting it to the actual escape character interferes with arrow keys and
//whatnot
//#define ESCAPE_KEY 0x1B
#define ESCAPE_KEY '`'
//Vertical Tab Ctrl+K
#define TOGGLE_KEY 0x0B
char im_buffer[IM_BUFFER_LEN+1];
char im_buffer_pos = 0;
int im_on = 1;
//recursive search, returns -1 on failure
//searches from [start, end)
int im_search(char * input, int start, int end) {
// 0 width search
if (end <= start) {
return -1;
}
//test for middle, works even for 1 width middle=start
int middle = start + (end-start)/2;
//printf("testing:%s\n",im_table[middle][0]);
int test = strncmp(im_table[middle][0], input, IM_TABLE_ENTRY_LEN);
if (test == 0) {
return middle;
}
//special case for width 1,2 region
if ((end - start) == 1) {
if (test == 0) {
return start;
} else {
return -1;
}
}
if (test == 0) {
return 0;
} else {
if (test > 0) {
return im_search(input,start,middle);
} else {
return im_search(input,middle,end);
}
}
}
//returns output len, since we want to be able to handle null bytes as well
int update_im_state(char input, char * output) {
if (input == TOGGLE_KEY) {
im_on = !im_on;
//clears the im buffer if its toggling off
if (!im_on) {
im_buffer[0] = 0;
im_buffer_pos = 0;
}
}
//just exit if the im is off
if (!im_on) {
output[0] = input;
output[1] = 0;
return 1;
}
if ( ('a' <= input && input <= 'z')||('0' <= input && input <= '9')||(input == ' ') ) {
if ( (im_buffer_pos < IM_BUFFER_LEN) && (im_buffer_pos < IM_TABLE_ENTRY_LEN) ){
im_buffer[im_buffer_pos] = input;
im_buffer_pos++;
im_buffer[im_buffer_pos] = 0;
} else {
//passthrough
output[0] = input;
output[1] = 0;
return 1;
}
//if there's a match return it
int im_entry = im_search(im_buffer, 0, IM_TABLE_LEN);
if (im_entry != -1) {
//clear the buffer
im_buffer[0] = 0;
im_buffer_pos = 0;
strncpy(output, im_table[im_entry][1], IM_TABLE_ENTRY_LEN);
return strlen(im_table[im_entry][1]);
}
} else {
//these only do something if there's something in the buffer, otherwise
//passthrough
if (im_buffer_pos > 0) {
switch (input) {
//escape, cancels
case ESCAPE_KEY:
im_buffer[0] = 0;
im_buffer_pos = 0;
return 0;
break;
//enter, enters the buffer
case ENTER_KEY:
for (int i = 0; i <im_buffer_pos; i++) {
output[i] = im_buffer[i];
}
output[im_buffer_pos] = 0;
int tmp = im_buffer_pos;
im_buffer_pos = 0;
return tmp;
break;
//backspace
case BACKSPACE_KEY:
if (im_buffer_pos > 0) {
im_buffer_pos--;
im_buffer[im_buffer_pos] = 0;
}
return 0;
break;
}
}
//default behavior of passthrough
output[0] = input;
output[1] = 0;
return 1;
}
}
|
