claunia/libcdio-osx
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More flexibility: allow any two of start, end, count. If only one or

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none are given, we'll supply default values.
This commit is contained in:
rocky
2003-09-22 01:00:10 +00:00
parent 9368735a1c
commit a1494406c1
2 changed files with 35 additions and 12 deletions
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34
src/cd-read.c
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@@ -1,5 +1,5 @@
/*
$Id: cd-read.c,v 1.6 2003/09/21 18:43:36 rocky Exp $
$Id: cd-read.c,v 1.7 2003/09/22 01:00:10 rocky Exp $
Copyright (C) 2003 Rocky Bernstein <rocky@panix.com>
@@ -297,10 +297,29 @@ parse_options (int argc, const char *argv[])
}
/* Check consistency between start_lsn, end_lsn and num_sectors. */
if (opts.end_lsn == CDIO_INVALID_LSN) {
if (0 == opts.num_sectors) {
opts.num_sectors = 1;
if (opts.start_lsn == CDIO_INVALID_LSN) {
/* Maybe we derive the start from the end and num sectors. */
if (opts.end_lsn == CDIO_INVALID_LSN) {
/* No start or end LSN, so use 0 for the start */
opts.start_lsn = 0;
if (opts.num_sectors == 0) opts.num_sectors = 1;
} else if (opts.num_sectors != 0) {
if (opts.end_lsn <= opts.num_sectors) {
fprintf(stderr,
"%s: end LSN (%d) needs to be greater than "
" the sector to read (%d)\n",
program_name, opts.end_lsn, opts.num_sectors);
exit(12);
}
opts.start_lsn = opts.end_lsn - opts.num_sectors + 1;
}
}
/* opts.start_lsn has been set somehow or we've aborted. */
if (opts.end_lsn == CDIO_INVALID_LSN) {
if (0 == opts.num_sectors) opts.num_sectors = 1;
opts.end_lsn = opts.start_lsn + opts.num_sectors - 1;
} else {
/* We were given an end lsn. */
@@ -308,7 +327,7 @@ parse_options (int argc, const char *argv[])
fprintf(stderr,
"%s: end LSN (%d) needs to be less than start LSN (%d)\n",
program_name, opts.start_lsn, opts.end_lsn);
exit(12);
exit(13);
}
if (opts.num_sectors != opts.end_lsn - opts.start_lsn + 1)
if (opts.num_sectors != 0) {
@@ -316,12 +335,11 @@ parse_options (int argc, const char *argv[])
"%s: inconsistency between start LSN (%d), end (%d), "
"and count (%d)\n",
program_name, opts.start_lsn, opts.end_lsn, opts.num_sectors);
exit(13);
exit(14);
}
opts.num_sectors = opts.end_lsn - opts.start_lsn + 1;
}
return true;
}
@@ -345,7 +363,7 @@ static void
init(void)
{
opts.debug_level = 0;
opts.start_lsn = 0;
opts.start_lsn = CDIO_INVALID_LSN;
opts.end_lsn = CDIO_INVALID_LSN;
opts.num_sectors = 0;
opts.read_mode = READ_MODE_UNINIT;