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-rw-r--r--util/spkmodem_recv/spkmodem-recv.c224
1 files changed, 127 insertions, 97 deletions
diff --git a/util/spkmodem_recv/spkmodem-recv.c b/util/spkmodem_recv/spkmodem-recv.c
index 7183563b..504121ab 100644
--- a/util/spkmodem_recv/spkmodem-recv.c
+++ b/util/spkmodem_recv/spkmodem-recv.c
@@ -9,6 +9,10 @@
#define _POSIX_SOURCE
+/*
+ * For OpenBSD define, to detect version
+ * for deciding whether to use pledge(2)
+ */
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
@@ -20,179 +24,216 @@
#include <string.h>
#include <unistd.h>
-static int set_ascii_bit(void);
-static void handle_audio(void), decode_pulse(void), print_char(void),
- print_stats(void);
-static void err(int nvm_errval, const char *msg, ...);
-static const char * getnvmprogname(void);
-static void set_err_if_unset(int x);
-
-int getopt(int, char * const *, const char *);
-extern char *optarg;
-extern int optind, opterr, optopt;
-
-#if defined(__OpenBSD__) && defined(OpenBSD)
-#if OpenBSD >= 509
-#ifndef HAVE_PLEDGE
-#define HAVE_PLEDGE 1
-#endif
-#endif
-#endif
-
#define SAMPLES_PER_FRAME 240
#define MAX_SAMPLES (2 * SAMPLES_PER_FRAME)
+
#define FREQ_SEP_MIN 5
#define FREQ_SEP_MAX 15
+
#define FREQ_DATA_MIN 15
#define FREQ_DATA_THRESHOLD 25
#define FREQ_DATA_MAX 60
+
#define THRESHOLD 500
-#define reset_char() ascii = 0, ascii_bit = 7
+struct decoder_state {
+ signed short frame[MAX_SAMPLES];
+ unsigned char pulse[MAX_SAMPLES];
+
+ int ringpos;
+ int freq_data;
+ int freq_separator;
+ int sample_count;
+
+ int ascii_bit;
+ unsigned char ascii;
-signed short frame[MAX_SAMPLES], pulse[MAX_SAMPLES];
-int ringpos, debug, freq_data, freq_separator, sample_count, ascii_bit = 7;
-char ascii = 0;
+ int debug;
+};
static const char *argv0;
+static void handle_audio(struct decoder_state *st);
+static void decode_pulse(struct decoder_state *st);
+static int set_ascii_bit(struct decoder_state *st);
+static void print_char(struct decoder_state *st);
+static void print_stats(struct decoder_state *st);
+static void reset_char(struct decoder_state *st);
+
+static void err(int errval, const char *msg, ...);
+static const char *progname(void);
+
+int getopt(int, char * const *, const char *);
+extern char *optarg;
+extern int optind;
+extern int opterr;
+extern int optopt;
+
+#ifndef errno
+extern int errno;
+#endif
+
int
-main(int argc, char *argv[])
+main(int argc, char **argv)
{
- int c = 0;
-
- argv0 = argv[0];
+ struct decoder_state st;
+ int c;
-#ifdef HAVE_PLEDGE
-#if HAVE_PLEDGE > 0
+#if defined (__OpenBSD__) && defined(OpenBSD)
+#if OpenBSD >= 509
if (pledge("stdio", NULL) == -1)
err(errno, "pledge");
#endif
#endif
- while (c != -1) {
+
+ memset(&st, 0, sizeof(st));
+ st.ascii_bit = 7;
+
+ argv0 = argv[0];
+
+ while (1) {
c = getopt(argc, argv, "d");
+ if (c == -1)
+ break;
if (c == 'd')
- debug = 1;
- else if (c != -1)
+ st.debug = 1;
+ else
err(EINVAL, "Invalid argument");
}
setvbuf(stdout, NULL, _IONBF, 0);
- while (1)
- handle_audio();
+ for (;;)
+ handle_audio(&st);
return EXIT_SUCCESS;
}
static void
-handle_audio(void)
+handle_audio(struct decoder_state *st)
{
int sample;
- if (sample_count > (3 * SAMPLES_PER_FRAME))
- sample_count = reset_char();
+ if (st->sample_count > (3 * SAMPLES_PER_FRAME))
+ reset_char(st);
- if ((freq_separator <= FREQ_SEP_MIN) || (freq_separator >= FREQ_SEP_MAX)
- || (freq_data <= FREQ_DATA_MIN) || (freq_data >= FREQ_DATA_MAX)) {
- decode_pulse();
+ if ((st->freq_separator <= FREQ_SEP_MIN) ||
+ (st->freq_separator >= FREQ_SEP_MAX) ||
+ (st->freq_data <= FREQ_DATA_MIN) ||
+ (st->freq_data >= FREQ_DATA_MAX)) {
+
+ decode_pulse(st);
return;
}
- if (set_ascii_bit() < 0)
- print_char();
+ if (set_ascii_bit(st) < 0)
+ print_char(st);
- sample_count = 0;
+ st->sample_count = 0;
for (sample = 0; sample < SAMPLES_PER_FRAME; sample++)
- decode_pulse();
+ decode_pulse(st);
}
static void
-decode_pulse(void)
+decode_pulse(struct decoder_state *st)
{
size_t n;
- int next_ringpos;
+ int next;
- next_ringpos = (ringpos + SAMPLES_PER_FRAME) % MAX_SAMPLES;
+ next = (st->ringpos + SAMPLES_PER_FRAME) % MAX_SAMPLES;
- freq_data -= pulse[ringpos];
- freq_data += pulse[next_ringpos];
- freq_separator -= pulse[next_ringpos];
+ st->freq_data -= st->pulse[st->ringpos];
+ st->freq_data += st->pulse[next];
+ st->freq_separator -= st->pulse[next];
- n = fread(&frame[ringpos], 1, sizeof(frame[0]), stdin);
- if (n != sizeof(frame[0])) {
+ n = fread(&st->frame[st->ringpos], sizeof(st->frame[0]), 1, stdin);
+ if (n != 1) {
if (feof(stdin))
exit(EXIT_SUCCESS);
err(errno, "stdin read");
}
- pulse[ringpos] = (abs(frame[ringpos]) > THRESHOLD) ? 1 : 0;
+ if (abs(st->frame[st->ringpos]) > THRESHOLD)
+ st->pulse[st->ringpos] = 1;
+ else
+ st->pulse[st->ringpos] = 0;
- freq_separator += pulse[ringpos];
- ringpos = (ringpos + 1) % MAX_SAMPLES;
+ st->freq_separator += st->pulse[st->ringpos];
- ++sample_count;
+ st->ringpos = (st->ringpos + 1) % MAX_SAMPLES;
+ st->sample_count++;
}
static int
-set_ascii_bit(void)
+set_ascii_bit(struct decoder_state *st)
{
- if (debug)
- print_stats();
+ if (st->debug)
+ print_stats(st);
+
+ if (st->freq_data < FREQ_DATA_THRESHOLD)
+ st->ascii |= (1 << st->ascii_bit);
- if (freq_data < FREQ_DATA_THRESHOLD)
- ascii |= (1 << ascii_bit);
+ st->ascii_bit--;
- --ascii_bit;
- return ascii_bit;
+ return st->ascii_bit;
}
static void
-print_stats(void)
+print_char(struct decoder_state *st)
{
- long stdin_pos;
-
- if ((stdin_pos = ftell(stdin)) == -1)
- err(errno, "ftell stdin");
+ if (st->debug)
+ printf("<%c,%x>", st->ascii, st->ascii);
+ else
+ putchar(st->ascii);
- printf ("%d %d %d @%ld\n", freq_data, freq_separator,
- FREQ_DATA_THRESHOLD, stdin_pos - sizeof(frame));
+ reset_char(st);
}
static void
-print_char(void)
+print_stats(struct decoder_state *st)
{
- if (debug)
- printf("<%c, %x>", ascii, ascii);
- else
- printf("%c", ascii);
+ long pos;
+
+ pos = ftell(stdin);
+ if (pos == -1)
+ err(errno, "ftell");
- reset_char();
+ printf("%d %d %d @%ld\n",
+ st->freq_data,
+ st->freq_separator,
+ FREQ_DATA_THRESHOLD,
+ pos - sizeof(st->frame));
}
static void
-err(int nvm_errval, const char *msg, ...)
+reset_char(struct decoder_state *st)
{
- va_list args;
+ st->ascii = 0;
+ st->ascii_bit = 7;
+}
- fprintf(stderr, "%s: ", getnvmprogname());
+static void
+err(int errval, const char *msg, ...)
+{
+ va_list ap;
- va_start(args, msg);
- vfprintf(stderr, msg, args);
- va_end(args);
+ fprintf(stderr, "%s: ", progname());
- set_err_if_unset(nvm_errval);
- fprintf(stderr, ": %s", strerror(errno));
+ va_start(ap, msg);
+ vfprintf(stderr, msg, ap);
+ va_end(ap);
- fprintf(stderr, "\n");
+ if (!errno)
+ errno = errval;
+ fprintf(stderr, ": %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
static const char *
-getnvmprogname(void)
+progname(void)
{
const char *p;
@@ -206,14 +247,3 @@ getnvmprogname(void)
else
return argv0;
}
-
-static void
-set_err_if_unset(int x)
-{
- if (errno)
- return;
- if (x > 0)
- errno = x;
- else
- errno = ECANCELED;
-}
generated by cgit v1.2.1 (git 2.18.0) at 2026-03-12 19:37:34 +0000