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-rw-r--r--src/send.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/src/send.c b/src/send.c
index 27dec1d..80a9192 100644
--- a/src/send.c
+++ b/src/send.c
@@ -29,6 +29,10 @@
#define DURATION 100 /* ms */ /* 100 ms → 10 Bd → 5 B/s */
#define LATENCY 100000 /* µs */
+#define CHAR_ESCAPE 0x10 /* Data link escape */
+#define CHAR_CANCEL 0x18 /* Cancel */
+#define CHAR_END 0x04 /* End of transmission */
+
#define N(buf) (sizeof(buf) / sizeof(*buf))
@@ -92,6 +96,7 @@ int main(int argc, char* argv[])
{
int r;
char buf[1024];
+ int c;
ssize_t n, i;
(void) argc;
@@ -124,17 +129,27 @@ int main(int argc, char* argv[])
if (n == 0)
break;
for (i = 0; i < n; i++)
- if (send_byte(buf[i]))
- goto snd_fail;
+ {
+ c = buf[i];
+ if ((c == CHAR_ESCAPE) || (c == CHAR_CANCEL) || (c == CHAR_END))
+ if (send_byte(CHAR_ESCAPE))
+ goto snd_fail;
+ if (send_byte(c))
+ goto snd_fail;
+ }
}
+ if (send_byte(CHAR_END))
+ goto snd_fail;
snd_pcm_close(sound_handle);
return 0;
fail:
perror(argv0);
+ send_byte(CHAR_CANCEL);
return 1;
snd_fail:
snd_pcm_close(sound_handle);
+ send_byte(CHAR_CANCEL);
return 1;
}