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/*
* 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>
/*
* We start at 'BASE_NOTE' Hz and increment by
* 'NOTE_STEP' Hz every next key.
*/
#define BASE_NOTE 300
#define NOTE_STEP 50
#define BEEP_MSEC 100
#define key_step(KEY) ('9' - ((KEY)))
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);
/* Should not happen */
if (step >= NELEM(freqtab)) {
step = key_step('0');
}
beep(freqtab[step]);
}
static void
play_loop(void)
{
uint16_t freq = 0;
char c;
running = true;
while (running) {
c = getchar();
switch (c) {
case 'q':
running = false;
break;
default:
if (!isdigit(c)) {
break;
}
play_notekey(c);
}
}
}
int
main(int argc, char **argv)
{
beep_fd = open("/dev/beep", O_WRONLY);
if (beep_fd < 0) {
return -1;
}
play_loop();
close(beep_fd);
}
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