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small optimization; fix line buffered read of length 0

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3065 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2004-06-01 20:25:44 +00:00
parent 5abf10e049
commit 61ca515494
1 changed files with 4 additions and 6 deletions
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10
libsrc/atari/read.s
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@ -1,5 +1,5 @@
; ;
; Christian Groessler, May-2004 ; Christian Groessler, Jun-2004
; ;
; int __fastcall__ read(int fd,void *buf,int count) ; int __fastcall__ read(int fd,void *buf,int count)
; ;
@ -87,7 +87,7 @@ newbuf:
lda ICBLL,x ; get # of bytes read lda ICBLL,x ; get # of bytes read
sta buflen sta buflen
lda #0 lda #0
sta index sta index ; fresh buffer
; restore user buffer address & length ; restore user buffer address & length
pla pla
@ -103,6 +103,7 @@ newbuf:
sta ICBLL,x sta ICBLL,x
; fall into use_buf ; fall into use_buf
lda buflen
; return bytes from line buffer ; return bytes from line buffer
; use buflen and index to access buffer ; use buflen and index to access buffer
@ -110,7 +111,6 @@ newbuf:
; use dataptr as a temporary pointer ; use dataptr as a temporary pointer
use_buf: use_buf:
lda buflen
sec sec
sbc index ; size of unread data in the buffer sbc index ; size of unread data in the buffer
sta cbs sta cbs
@ -162,9 +162,7 @@ c1: ldx #0
btsmall: btsmall:
lda cbs lda cbs
sta ICBLL,x sta ICBLL,x
bne icbll_copy bpl icbll_copy
; brk ; not reached
.zeropage .zeropage