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Add a useful usage message.

This commit is contained in:
Philip Heron 2014-08-28 20:35:31 +01:00
parent 278004fb0c
commit e46d3a3c0f
1 changed files with 11 additions and 1 deletions
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12
main.c
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@ -25,7 +25,17 @@
void exit_usage()
{
fprintf(stderr, "Usage: ssdv [-e|-d] [-n] [-t <percentage>] [-c <callsign>] [-i <id>] [<in file>] [<out file>]\n");
fprintf(stderr,
"Usage: ssdv [-e|-d] [-n] [-t <percentage>] [-c <callsign>] [-i <id>] [<in file>] [<out file>]\n"
"\n"
" -e Encode JPEG to SSDV packets.\n"
" -d Decode SSDV packets to JPEG.\n"
"\n"
" -n Encode or decode packets with no FEC.\n"
" -t For testing, drops the specified percentage of packets while decoding.\n"
" -c Set the callign. Accepts A-Z 0-9 and space, up to 6 characters.\n"
" -i Set the image ID (0-255).\n"
"\n");
exit(-1);
}