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Merge pull request #11 from brouhaha/lars/label

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Make read20 parse and skip over ANSI tape labels.
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Eric Smith 2020-07-23 21:56:11 -06:00 committed by GitHub
commit 56d22663af
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1 changed files with 60 additions and 0 deletions
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read20.c
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@ -51,6 +51,7 @@ int verbose = 0;
int genflg; /* keep generation number */
int nselect; /* number of files still to be selected by number */
int doallflag; /* act on all files cause no args given */
int label; /* there was a tape label */
int number; /* Current output file "number" */
@ -382,6 +383,22 @@ void getwords (char *block, /* Tape block */
}
/*
* Unpack into buffer 's' the 8 bit string stored in 'block' and
* append a null char.
* Returns number of chars stored in output buffer.
*/
int getascii (char *block, /* Tape block */
char *s /* Destination string buffer */,
int off, /* 8-bit offset from start of tape block */
int max) /* Max number of characters to xfer into s */
{
memcpy (s, block + off, max);
s[max] = 0;
return max;
}
#define SecPerTick (24.*60.*60.)/0777777
#define DayBaseDelta 0117213 /* Unix day 0 in Tenex format */
@ -732,6 +749,38 @@ void doTapeTrailer (char *block)
}
void doAnsiLabel (char *block)
{
char string[80];
getascii (block, string, 0, 4);
if (debug > 10) printf("ANSI Label %s\n", string);
if (strncmp (block, "VOL1", 4) == 0) {
getascii (block, string, 4, 6);
printf ("ANSI Volume Identifier: %s\n", string);
} else if (strncmp (block, "HDR1", 4) == 0) {
if (verbose) {
getascii (block, string, 4, 17);
printf ("ANSI File Indentifier: %s\n", string);
getascii (block, string, 21, 6);
printf ("File Set: %s\n", string);
getascii (block, string, 27, 4);
printf ("File Section: %s\n", string);
}
} else if (strncmp (block, "HDR2", 4) == 0) {
if (verbose) {
getascii (block, string, 4, 1);
printf ("Record Format: %s\n", string);
getascii (block, string, 5, 5);
printf ("Block Length: %s\n", string);
getascii (block, string, 10, 5);
printf ("Record Length: %s\n", string);
}
}
}
int compwant(const void *wa1, const void *wa2)
{
const struct want *w1 = wa1;
@ -847,6 +896,7 @@ int main (int argc, char *argv[])
if (! tape_handle)
punt(1, "Can't open tape '%s'", tape);
label = 0;
rc = 0;
for ( ; ; ) /* Loop till end of tape */
{
@ -856,10 +906,20 @@ int main (int argc, char *argv[])
if (debug > 99)
printf("rc=%d\n", rc);
if ((rc % (518*5)) != 0) {
if (rc == 80) {
doAnsiLabel(tapeblocka);
label = 1;
rc = 0;
continue;
}
if (rc != 0)
punt(1, "Oops. Read block len = %d", rc);
}
if (rc == 0) {
if (label) {
label = 0;
continue;
}
if (verbose)
printf("\nEnd of tape.\n");
exit(0); /* Normal exit */