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usr.bin/vtspeakd/vtspeakd.c

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/*-
* Copyright (c) 2022 Hans Petter Selasky <hselasky@freebsd.org>
gbeUnsubmitted
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SPDX identifier missing.

gbe: SPDX identifier missing.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <err.h>
#include <stdio.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#define WRAP(str) (char []){str}
static const char *speak_prog = "/usr/local/bin/espeak";
static const char *beep_prog = "/usr/bin/beep";
static void (*fn)(const char *);
static bool background;
static bool chatty;
static void
sync_execv(const char *path, char *const argv[])
{
int pid;
pstefUnsubmitted
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What do you think about replacing &tmp with &((unsigned) {1})?
And similarly, use compound literals in the other calls to sysctlbyname()?

pstef: What do you think about replacing `&tmp` with `&((unsigned) {1})`? And similarly, use compound…
hselaskyAuthorUnsubmitted
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Can you explain this a bit more?

hselasky: Can you explain this a bit more?
pstefUnsubmitted
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sysctlbyname("kern.vt.accessibility.feed", NULL, NULL, &((unsigned) {1}), sizeof(tmp)); should work the same by providing an address to an unnamed object of the same type and value as in the original. It has the advantage of getting rid of the name tmp and the need for declaring it before use.

pstef: `sysctlbyname("kern.vt.accessibility.feed", NULL, NULL, &((unsigned) {1}), sizeof(tmp));`…
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I failed to pay attention to the final argument; it would also have to be changed - probably to sizeof(unsigned).

pstef: I failed to pay attention to the final argument; it would also have to be changed - probably to…
hselaskyAuthorUnsubmitted
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But does that make the "&tmp" and "sizeof(tmp)" get out of order?

I think it is better to take the address and size of the same variable, than splitting the two.

hselasky: But does that make the "&tmp" and "sizeof(tmp)" get out of order? I think it is better to take…
pid = fork();
if (pid == 0) {
execv(path, argv);
exit(0);
} else if (pid != -1) {
waitpid(pid, NULL, 0);
}
}
static void
feed(void)
{
unsigned tmp = 1;
sysctlbyname("kern.vt.accessibility.feed", NULL, NULL, &tmp, sizeof(tmp));
}
static void
speak(const char *what)
{
char buffer[256];
char *data;
char *argv[4];
size_t len;
uint16_t row = 0;
uint16_t col = 0;
len = sizeof(row);
sysctlbyname("kern.vt.accessibility.row", &row, &len, NULL, 0);
len = sizeof(col);
sysctlbyname("kern.vt.accessibility.col", &col, &len, NULL, 0);
len = 0;
sysctlbyname(what, NULL, &len, NULL, 0);
if (len == 0)
return;
data = malloc(len + 1);
memset(data, 0, len + 1);
sysctlbyname(what, data, &len, NULL, 0);
snprintf(buffer, sizeof(buffer), "row %u column %u ", row, col);
argv[0] = WRAP("espeak");
argv[1] = WRAP("--");
argv[2] = buffer;
argv[3] = NULL;
sync_execv(speak_prog, argv);
argv[2] = data;
sync_execv(speak_prog, argv);
free(data);
}
static void
beep(const char *what)
{
char rbuf[16];
char cbuf[16];
char *data;
char *argv[5];
size_t len;
uint16_t row = 0;
uint16_t col = 0;
len = sizeof(row);
sysctlbyname("kern.vt.accessibility.row", &row, &len, NULL, 0);
len = sizeof(col);
sysctlbyname("kern.vt.accessibility.col", &col, &len, NULL, 0);
len = 0;
sysctlbyname(what, NULL, &len, NULL, 0);
if (len == 0)
return;
data = malloc(3 + len + 1);
memset(data, 0, 3 + len + 1);
sysctlbyname(what, data + 3, &len, NULL, 0);
data[0] = '-';
data[1] = 't';
data[2] = ' ';
snprintf(rbuf, sizeof(rbuf), "-s %u", row);
snprintf(cbuf, sizeof(cbuf), "-s %u", col);
argv[0] = WRAP("beep");
argv[1] = rbuf;
argv[2] = WRAP("-F 110");
argv[3] = WRAP("-D 50");
argv[4] = NULL;
sync_execv(beep_prog, argv);
argv[0] = WRAP("beep");
argv[1] = cbuf;
argv[2] = WRAP("-F 220");
argv[3] = WRAP("-D 50");
argv[4] = NULL;
sync_execv(beep_prog, argv);
argv[0] = WRAP("beep");
argv[1] = data;
argv[2] = WRAP("-F 330");
argv[3] = WRAP("-D 50");
argv[4] = NULL;
sync_execv(beep_prog, argv);
free(data);
}
static void
usage(void)
{
fprintf(stderr, "Usage: %s [parameters]\n"
"\t" "-b Beep the console contents (default)\n"
"\t" "-s Speak the console contents\n"
"\t" "-c Be chatty\n"
"\t" "-B Run in background\n"
"\t" "-h Show usage\n",
getprogname());
exit(1);
}
int
main(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "Bbcsh")) != -1) {
switch (c) {
case 'B':
background = true;
break;
case 'b':
fn = &beep;
break;
case 'c':
chatty = true;
break;
case 's':
fn = &speak;
break;
default:
usage();
break;
}
}
if (fn == NULL)
fn = &beep;
if (background && daemon(0, 0) != 0)
errx(1, "daemon(0,0) failed");
for (;;) {
fn(chatty ? "kern.vt.accessibility.text_chatty" : "kern.vt.accessibility.text_utf8");
feed();
sleep(1);
}
return (0);
}