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
|
/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#define BEEP_MSEC 100
#define key_step(KEY) ('9' - ((KEY)))
static uint8_t freq_addend = 0;
static uint16_t freqtab[] = {
[ key_step('0') ] = 950,
[ key_step('9') ] = 900,
[ key_step('8') ] = 850,
[ key_step('7') ] = 800,
[ key_step('6') ] = 750,
[ key_step('5') ] = 700,
[ key_step('4') ] = 650,
[ key_step('3') ] = 600,
[ key_step('2') ] = 550,
[ key_step('1') ] = 500
};
static int beep_fd = 0;
static bool running = false;
static void
beep(uint16_t freq)
{
uint32_t payload;
if (beep_fd < 0) {
return;
}
payload = freq;
payload |= (BEEP_MSEC << 16);
write(beep_fd, &payload, sizeof(payload));
}
static inline void
play_notekey(char key)
{
uint8_t step = key_step(key);
uint16_t freq;
/* Should not happen */
if (step >= NELEM(freqtab)) {
step = key_step('0');
}
freq = freqtab[step] + freq_addend;
beep(freq);
}
static void
play_loop(void)
{
uint16_t freq = 0;
char c;
running = true;
while (running) {
c = getchar();
switch (c) {
case 'q':
running = false;
break;
case 'i':
/* NOTE: Overflow purposefully allowed here */
++freq_addend;
printf("%d ", freq_addend);
break;
case 'd':
/* NOTE: Underflow purposefully allowed here */
--freq_addend;
printf("%d ", freq_addend);
break;
default:
if (!isdigit(c)) {
break;
}
play_notekey(c);
}
}
printf("\ncya!\n");
}
int
main(int argc, char **argv)
{
beep_fd = open("/dev/beep", O_WRONLY);
if (beep_fd < 0) {
return -1;
}
printf("bleep bloop time! - [i]nc/[d]ec\n");
play_loop();
close(beep_fd);
}
|
