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Compatibility: Allow fat/data/dir type hints even for disk read

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in int 21.7305 to fix compat issue found by Christian Wallbaum.


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1365 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Eric Auer 2008-04-12 15:54:29 +00:00
parent bec1b777f4
commit 74167734ff
1 changed files with 4 additions and 3 deletions
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7
kernel/inthndlr.c
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@ -351,9 +351,10 @@ int int21_fat32(lregs *r)
struct HugeSectorBlock FAR *SectorBlock =
(struct HugeSectorBlock FAR *)MK_FP(r->DS, r->BX);
UBYTE mode;
/* bit 0 of SI is 0 read / 1 write, bits 13/14 indicate a type: */
/* 0 any, 1 fat, 2 dir, 3 file. Type is mostly for "write hints" */
if (r->CX != 0xffff || ((r->SI & 1) == 0 && r->SI != 0)
|| (r->SI & ~0x6001))
if (r->CX != 0xffff || (r->SI & ~0x6001))
{
return DE_INVLDPARM;
}
@ -361,7 +362,7 @@ int int21_fat32(lregs *r)
if (r->DL > lastdrive || r->DL == 0)
return -0x207;
if (r->SI == 0)
if ((r->SI & 1) == 0) /* while uncommon, reads CAN have type hints */
mode = DSKREADINT25;
else
mode = DSKWRITEINT26;