NetBSD/usr.sbin/mscdlabel/iso9660.c

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/* $NetBSD: iso9660.c,v 1.2 2005/09/14 09:41:24 drochner Exp $ */
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <err.h>
#include <isofs/cd9660/iso.h>
#include "mscdlabel.h"
#define BLKSIZ ISO_DEFAULT_BLOCK_SIZE
static void
printinfo(struct iso_primary_descriptor *vd)
{
char label[32 + 1], date[] = "yyyy/mm/dd hh:mm", *d;
strlcpy(label, vd->volume_id, sizeof(label));
/* strip trailing blanks */
d = label + strlen(label);
while (d > label && *(d - 1) == ' ')
d--;
*d = '\0';
d = vd->creation_date;
memcpy(date, d, 4); /* year */
memcpy(date + 5, d + 4, 2); /* month */
memcpy(date + 8, d + 6, 2); /* day */
memcpy(date + 11, d + 8, 2); /* hour */
memcpy(date + 14, d + 10, 2); /* min */
printf("ISO filesystem, label \"%s\", creation time: %s\n",
label, date);
}
int
check_primary_vd(int fd, int start, int len)
{
int i, res, isiso;
struct iso_primary_descriptor *vd;
isiso = 0;
vd = malloc(BLKSIZ);
for (i = 16; (i < 100) && (i < len); i++) {
res = pread(fd, vd, BLKSIZ, (start + i) * BLKSIZ);
if (res < 0) {
warn("read CD sector %d", start + i);
break;
}
if (memcmp(vd->id, ISO_STANDARD_ID, sizeof(vd->id)))
continue;
if (isonum_711(vd->type) == ISO_VD_PRIMARY) {
printinfo(vd);
isiso = 1;
break;
} else if (isonum_711(vd->type) == ISO_VD_END)
break;
}
free(vd);
return (isiso);
}