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Fix the NUL device so it returns 0 bytes for reads, independent of whether

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cooked or raw mode is used. It was broken for raw mode. Fixes problem
with DJGPP sed (see
http://sourceforge.net/tracker/index.php?func=detail&aid=1429741&group_id=49784&atid=457447)


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1306 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2007-05-14 23:52:39 +00:00
parent 599278eeae
commit 46d959f0cb
2 changed files with 5 additions and 1 deletions
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2
kernel/dosfns.c
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@ -263,7 +263,7 @@ long DosRWSft(int sft_idx, size_t n, void FAR * bp, int mode)
/* Test for eof and exit */ /* Test for eof and exit */
/* immediately if it is */ /* immediately if it is */
if (!(s->sft_flags & SFT_FEOF) || (s->sft_flags & SFT_FNUL)) if (!(s->sft_flags & SFT_FEOF))
return 0; return 0;
if (s->sft_flags & SFT_FCONIN) if (s->sft_flags & SFT_FCONIN)

4
kernel/kernel.asm
View File

@ -223,6 +223,10 @@ _nul_intr:
push es push es
push bx push bx
les bx,[cs:_ReqPktPtr] ;es:bx--> rqheadr les bx,[cs:_ReqPktPtr] ;es:bx--> rqheadr
cmp byte [es:bx+2],4 ;if read, set 0 read
jne no_nul_read
mov word [es:bx+12h],0
no_nul_read:
or word [es:bx+3],100h ;set "done" flag or word [es:bx+3],100h ;set "done" flag
pop bx pop bx
pop es pop es