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Initialize d->bios_cyl. We know the media size in sectors, the number

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of heads end the number of sectors per track. If there's an obvious
insanity (heads and sectors are both zero or the media size is not
an integral multiple of heads times sector) we set the number of
cylinders to zero.
This commit is contained in:
marcel 2002-11-03 01:37:08 +00:00
parent 02575bafa7
commit c9f86b731d
1 changed files with 10 additions and 4 deletions
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14
lib/libdisk/disk.c
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@ -153,7 +153,7 @@ Int_Open_Disk(const char *name)
d->name = strdup(name);
a = strsep(&p, " "); /* length in bytes */
o = strtoimax(a, &r, 0);
len = strtoimax(a, &r, 0);
if (*r) { printf("BARF %d <%d>\n", __LINE__, *r); exit (0); }
a = strsep(&p, " "); /* sectorsize */
@ -161,12 +161,11 @@ Int_Open_Disk(const char *name)
if (*r) { printf("BARF %d <%d>\n", __LINE__, *r); exit (0); }
d->sector_size = s;
len /= s; /* media size in number of sectors. */
if (Add_Chunk(d, 0, o / s, name, whole, 0, 0, "-"))
if (Add_Chunk(d, 0, len, name, whole, 0, 0, "-"))
DPRINT(("Failed to add 'whole' chunk"));
len = o / s;
for (;;) {
a = strsep(&p, " ");
if (a == NULL)
@ -182,6 +181,13 @@ Int_Open_Disk(const char *name)
printf("HUH ? <%s> <%s>\n", a, b);
}
/*
* Calculate the number of cylinders this disk must have. If we have
* an obvious insanity, we set the number of cyclinders to zero.
*/
o = d->bios_hd * d->bios_sect;
d->bios_cyl = (o != 0 && (len % o) == 0) ? len / o : 0;
p = q;
lo[0] = 0;