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util/spkmodem-recv: code cleanup

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 07:13:42 +00:00
parent 2479633368
commit a4f5061297
1 changed files with 35 additions and 35 deletions
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70
util/spkmodem_recv/spkmodem-recv.c
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@@ -1,11 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2013 Free Software Foundation, Inc. */
/* Usage: parec --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */
/* Forked from coreboot's version, at util/spkmodem_recv/ in coreboot.git,
* revision 5c2b5fcf2f9c9259938fd03cfa3ea06b36a007f0 as of 3 January 2022.
* This version is heavily modified, re-written based on OpenBSD Kernel Source
* File Style Guide (KNF); this change is Copyright 2023,2026 Leah Rowe. */
/*
* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2013 Free Software Foundation, Inc.
* Copyright (c) 2023, 2026 Leah Rowe <leah@libreboot.org>
*
* This program receives text encoded as pulses on the PC speaker,
* and decodes them. This is a special type of interface provided
* by coreboot and GRUB, for computers that lack serial ports.
*
* Usage example:
* parec --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv
*
* Originally provided by GNU GRUB, this version is a heavily
* modified fork that complies with the OpenBSD Kernel Source
* File Style Guide (KNF) instead of GNU coding standards; it
* emphasises strict error handling, portability and code
* quality, as characterised by OpenBSD projects.
*
* This fork of spkmodem-recv is provided with Libreboot releases:
* https://libreboot.org/
*/
#define _POSIX_SOURCE
@@ -110,13 +123,10 @@ main(int argc, char **argv)
argv0 = argv[0];
while ((c = getopt(argc, argv, "d")) != -1) {
switch (c) {
case 'd':
st.debug = 1;
break;
default:
if (c != 'd')
usage();
}
st.debug = 1;
break;
}
setvbuf(stdout, NULL, _IONBF, 0);
@@ -134,20 +144,17 @@ handle_audio(struct decoder_state *st)
if (st->sample_count > (3 * SAMPLES_PER_FRAME))
reset_char(st);
if (valid_signal(st)) {
if (set_ascii_bit(st) < 0)
print_char(st);
st->sample_count = 0;
for (sample = 0; sample < SAMPLES_PER_FRAME; sample++)
decode_pulse(st);
} else {
if (!valid_signal(st)) {
decode_pulse(st);
return;
}
if (set_ascii_bit(st) < 0)
print_char(st);
st->sample_count = 0;
for (sample = 0; sample < SAMPLES_PER_FRAME; sample++)
decode_pulse(st);
}
static int
@@ -222,12 +229,10 @@ set_ascii_bit(struct decoder_state *st)
{
if (st->debug)
print_stats(st);
if (st->freq_data < FREQ_DATA_THRESHOLD)
st->ascii |= (1 << st->ascii_bit);
st->ascii_bit--;
return st->ascii_bit;
}
@@ -247,9 +252,7 @@ print_stats(struct decoder_state *st)
{
long pos;
pos = ftell(stdin);
if (pos == -1) {
if ((pos = ftell(stdin)) == -1) {
printf("%d %d %d\n",
st->freq_data,
st->freq_separator,
@@ -282,10 +285,7 @@ err(int errval, const char *msg, ...)
vfprintf(stderr, msg, ap);
va_end(ap);
if (!errno)
errno = errval;
fprintf(stderr, ": %s\n", strerror(errno));
fprintf(stderr, ": %s\n", strerror(errval));
exit(EXIT_FAILURE);
}