Hello Eduardo,
> I'm implementing NLSFUNC for FreeDOS and I've found that many (most) of
> the needed MUX functions are missing.
> This patch implements functions 2F1226h to 2F1229h. This, together with
> my previous nls.c patch, allowed me to make a first working
> implementation of NLSFUNC's int 2F1404h, but the patch looks so simple
> that I must have done something wrong :) so, kernel guys, please, have
> a look at it. It is mainly cut'n'paste from int21_service()
a)
why do you need int2f/12 in the first first place ?
are you really executing this from inside KERNEL ?
do you really need to use internal functions ?
if YES, you will probably greatly overrun the kernels 384 byte stack,
which might become a problem.
if NO, why don't you use int21 functions ?
b) lseek(0x1ffff) will fail due to fall from locng_check into
shortcheck.
tom
> Eduardo.
> diff -uNrp ke2035.orig/kernel/inthndlr.c ke2035/kernel/inthndlr.c
> --- ke2035.orig/kernel/inthndlr.c 2004-06-24 22:41:20.000000000 +0200
> +++ ke2035/kernel/inthndlr.c 2004-06-24 22:41:09.000000000 +0200
> @@ -1656,6 +1656,9 @@ struct int2f12regs {
> */
> VOID ASMCFUNC int2F_12_handler(struct int2f12regs r)
> {
> + COUNT rc;
> + long lrc;
> +
> if (r.AH == 0x4a)
> {
> size_t size = 0, offs = 0xffff;
> @@ -1869,6 +1875,42 @@ VOID ASMCFUNC int2F_12_handler(struct in
> r.CX = fstrlen(MK_FP(r.DS, r.SI)) + 1;
> break;
> + case 0x26: /* open file */
> + r.FLAGS &= ~FLG_CARRY;
> + CritErrCode = SUCCESS;
> + lrc = DosOpen(MK_FP(r.DS, r.DX), O_LEGACY | O_OPEN | r.CL, 0);
> + goto long_check;
> +
> + case 0x27: /* close file */
> + r.FLAGS &= ~FLG_CARRY;
> + CritErrCode = SUCCESS;
> + rc = DosClose(r.BX);
> + goto short_check;
> +
> + case 0x28: /* move file pointer */
> + r.FLAGS &= ~FLG_CARRY;
> + CritErrCode = SUCCESS;
> + r.BP &= 0x00ff;
+ if (r.BP >> 2)
> + goto error_invalid;
> + lrc = DosSeek(r.BX, (LONG)((((ULONG) (r.CX)) << 16) | r.DX),
> r.BP);
> + if (lrc == -1)
> + {
> + lrc = DE_INVLDHNDL;
> + }
> + else
> + {
> + r.DX = (UWORD)(lrc >> 16);
> + lrc = (UWORD) lrc;
> + }
> + goto long_check;
> +
> + case 0x29: /* read from file */
> + r.FLAGS &= ~FLG_CARRY;
> + CritErrCode = SUCCESS;
> + lrc = DosRead(r.BX, r.CX, MK_FP(r.DS, r.DX));
> + goto long_check;
> +
> case 0x2a: /* Set FastOpen but does nothing. */
> r.FLAGS &= ~FLG_CARRY;
> @@ -1897,6 +1939,26 @@ VOID ASMCFUNC int2F_12_handler(struct in
> r.FLAGS |= FLG_CARRY;
> }
> }
> + goto real_exit;
> +long_check:
+ if (lrc >>= SUCCESS)
> + {
> + r.AX = (UWORD)lrc;
> + goto real_exit;
> + }
> + rc = (int)lrc;
> +short_check:
> + if (rc < SUCCESS)
> + goto error_exit;
> + goto real_exit;
> +error_invalid:
> + rc = DE_INVLDFUNC;
> +error_exit:
> + r.AX = -rc;
> + if (CritErrCode == SUCCESS)
> + CritErrCode = r.AX; /* Maybe set */
> + r.FLAGS |= FLG_CARRY;
> +real_exit:;
> }
> /*
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--
Best regards,
Tom Ehlert
mailto:[EMAIL PROTECTED]
+49-241-79886
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