From: cpg <cpg@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Tue, 1 Jun 2004 20:25:44 +0000 (+0000)
Subject: small optimization; fix line buffered read of length 0
X-Git-Tag: V2.12.0~766
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=61ca51549480d42140c8dac028eb26a3b33477de;p=cc65

small optimization; fix line buffered read of length 0


git-svn-id: svn://svn.cc65.org/cc65/trunk@3065 b7a2c559-68d2-44c3-8de9-860c34a00d81
---

diff --git a/libsrc/atari/read.s b/libsrc/atari/read.s
index b5b6ee011..b7183d12b 100644
--- a/libsrc/atari/read.s
+++ b/libsrc/atari/read.s
@@ -1,5 +1,5 @@
 ;
-; Christian Groessler, May-2004
+; Christian Groessler, Jun-2004
 ;
 ; int __fastcall__ read(int fd,void *buf,int count)
 ;
@@ -87,7 +87,7 @@ newbuf:
 	lda	ICBLL,x		; get # of bytes read
 	sta	buflen
 	lda	#0
-	sta	index
+	sta	index		; fresh buffer
 
 	; restore user buffer address & length
 	pla
@@ -103,6 +103,7 @@ newbuf:
 	sta	ICBLL,x
 
 	; fall into use_buf
+	lda	buflen
 
 ; return bytes from line buffer
 ; use buflen and index to access buffer
@@ -110,7 +111,6 @@ newbuf:
 ; use dataptr as a temporary pointer
 
 use_buf:
-	lda	buflen
 	sec
 	sbc	index		; size of unread data in the buffer
 	sta	cbs
@@ -162,9 +162,7 @@ c1:	ldx	#0
 btsmall:
 	lda	cbs
 	sta	ICBLL,x
-	bne	icbll_copy
-
-;	brk			; not reached
+	bpl	icbll_copy
 
 	.zeropage