diff -r eab134bd8b94 -r f2d1d7b2d649 PositionableStream.st
--- a/PositionableStream.st	Wed Mar 05 11:01:20 2014 +0100
+++ b/PositionableStream.st	Wed Mar 05 11:02:58 2014 +0100
@@ -116,7 +116,6 @@
     "Modified: / 13-07-2006 / 20:36:54 / cg"
 ! !
 
-
 !PositionableStream methodsFor:'Compatibility-Dolphin'!
 
 endChunk
@@ -391,14 +390,14 @@
     first := aCollection at:1.
     [self atEnd] whileFalse:[
         buffer := self nextAvailable:len.
-        buffer = aCollection ifTrue:[
-            ^ self
-        ].
         buffer size == len ifTrue:[
+            buffer = aCollection ifTrue:[
+                ^ self
+            ].
             "expect more input"
             idx := buffer indexOf:first startingAt:2.
-            idx == 0 ifFalse:[
-                self position:(self position - len + idx - 1)
+            idx ~~ 0 ifTrue:[
+                self skip:(idx - len - 1)
             ].
         ].
     ].
@@ -560,28 +559,30 @@
 
 !PositionableStream methodsFor:'queries'!
 
-endsWith:aSequenceableCollection
+endsBeforePositionWith:aSequenceableCollection
     "answer true, if the elements in aSequenceableCollection
-     form the end of the stream."
+     are at the current end of the stream up to position."
 
-    self contentsSpecies == collection class ifTrue:[
-        |sz|
+    |sz pos|
 
-        sz := aSequenceableCollection size.
-        position < sz ifTrue:[
-            ^ false.
-        ].
-        ^ collection sameContentsFrom:position+1-sz to:position as:aSequenceableCollection startingAt:1.
+    sz := aSequenceableCollection size.
+    pos := self position.
+    pos < sz ifTrue:[
+        ^ false.
     ].
-    ^ self contents endsWith:aSequenceableCollection
+    self contentsSpecies == collection class ifTrue:[
+        ^ collection sameContentsFrom:pos+1-sz to:pos as:aSequenceableCollection startingAt:1.
+    ].
+    self position:pos-sz.
+    ^ (self next:sz) = aSequenceableCollection.
 
     "
-        ('' writeStream nextPutAll:'Hello World') endsWith:'World'
-        ('' writeStream nextPutAll:'Hello World') endsWith:'Hello World'
-        ('' writeStream nextPutAll:'Hello World') endsWith:'xHello World'
-        ('' writeStream nextPutAll:'Hello World') endsWith:'Bla'
-        ('' writeStream) endsWith:'Bla'
-        ('' writeStream) endsWith:''
+        ('' writeStream nextPutAll:'Hello World') endsBeforePositionWith:'World'
+        ('' writeStream nextPutAll:'Hello World') endsBeforePositionWith:'Hello World'
+        ('' writeStream nextPutAll:'Hello World') endsBeforePositionWith:'Hello Worldx'
+        ('' writeStream nextPutAll:'Hello World') endsBeforePositionWith:'Bla'
+        ('' writeStream) endsBeforePositionWith:'Bla'
+        ('' writeStream) endsBeforePositionWith:''
         ''  endsWith:''
     "
 ! !
@@ -675,18 +676,18 @@
            which position after the found item. We implement the method
            this way for the sake of ST80-compatibility."
 
-    |answerStream element last rslt|
+    |answerStream element last|
 
     last := aCollection last.
-    answerStream := WriteStream on:(self contentsSpecies new).
-    [self atEnd] whileFalse:[
-        element := self next.
+    answerStream := WriteStream on:(self contentsSpecies new:100).
+    [(element := self nextOrNil) notNil] whileTrue:[
         answerStream nextPut:element.
-        element == last ifTrue:[
-            ((rslt := answerStream contents) endsWith:aCollection) ifTrue:[
-                self position:(self position - aCollection size).
-                ^ rslt copyButLast:aCollection size
-            ]
+        (element = last and:[answerStream endsBeforePositionWith:aCollection]) ifTrue:[
+            |backStep|
+            backStep := aCollection size negated.
+            self skip:backStep.
+            answerStream skip:backStep.
+            ^ answerStream contents
         ].
     ].
     ^ answerStream contents
@@ -694,21 +695,21 @@
     "
      |s|
      s := ReadStream on:'hello world'.
-     Transcript show:'<'; show:(s upToAll:'wo'); showCR:'>'. 
+     Transcript show:'<'; show:(s upToAll_positionBefore:'wo'); showCR:'>'. 
      Transcript showCR:s atEnd.
      Transcript show:'<'; show:(s upToEnd); showCR:'>'. 
     "
     "
      |s|
      s := ReadStream on:'hello world'.
-     Transcript show:'<'; show:(s upToAll:'wo'); showCR:'>'. 
+     Transcript show:'<'; show:(s upToAll_positionBefore:'wo'); showCR:'>'. 
      Transcript showCR:s atEnd.
-     Transcript show:'<'; show:(s upToAll:'wo'); showCR:'>'. 
+     Transcript show:'<'; show:(s upToAll_positionBefore:'wo'); showCR:'>'. 
     "
     "
      |s|
      s := ReadStream on:'hello world'.
-     Transcript show:'<'; show:(s upToAll:'xx'); showCR:'>'. 
+     Transcript show:'<'; show:(s upToAll_positionBefore:'xx'); showCR:'>'. 
      Transcript showCR:s atEnd.
      Transcript show:'<'; show:(s upToEnd); showCR:'>'. 
     "
@@ -748,11 +749,11 @@
 !PositionableStream class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.165 2014-03-04 12:36:39 stefan Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.166 2014-03-05 10:02:58 stefan Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.165 2014-03-04 12:36:39 stefan Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/PositionableStream.st,v 1.166 2014-03-05 10:02:58 stefan Exp $'
 ! !