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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | |||||||
| 0007167 | [Squeak] System | major | always | 08-29-08 11:46 | 09-19-09 20:55 | |||||||
| Reporter | norbertf | View Status | public | |||||||||
| Assigned To | ||||||||||||
| Priority | normal | Resolution | open | |||||||||
| Status | feedback | Product Version | 3.10 | |||||||||
| Summary | 0007167: ReadWriteStream opened with "on: aCollection" always has readLimit 0 | |||||||||||
| Description |
Example: "(ReadWriteStream on: 'abc') next" returns nil Encountered this when trying in vain: "Form fromBinaryStream: (RWBinaryOrTextStream on: file contents)" The reason is that ReadWriteStream is a subclass of WriteStream which does "readLimit := 0" in its WriteStream>on: method. my fix is: ----------- 'From Squeak3.10-basic of 26 May 2008 [latest update: 0007160] on 29 August 2008 at 1:27:05 pm'! !ReadWriteStream methodsFor: 'private' stamp: 'nf 8/29/2008 13:26'! on: aCollection 'fixing the bug that a ReadWriteStream had the readLimit set to 0 from the WriteStream>on: method' super on: aCollection. readLimit := aCollection size! ! ----------- After fixing this I saw immediately one side effect: A real time clock in a seaside interface showed extraneous garbage characters at the end. I suspect this is another bug. |
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| Additional Information | A cursory glance at references to ReadWriteStream seems to indicate that most uses are for writing rather than reading which would explain why this bug was not noticed before. | |||||||||||
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(0012537 - 161 - 205 - 205 - 205 - 205 - 205) norbertf 08-29-08 12:32 |
Found a better fix for my problem: (ReadWriteStream with: 'abc') reset next works It seems like "on:" is for writing and "with:" is for reading and writing. |
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(0012711 - 29 - 29 - 29 - 29 - 29 - 29) Keith_Hodges 10-01-08 01:35 |
Do others agree with Norbert? |
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(0013007 - 140 - 164 - 164 - 164 - 164 - 164) nicolas cellier 03-05-09 19:35 |
Good questions could be What does ANSI says ? What do other dialects do ? And last, is it worth changing ? (how much code would break ?) |
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(0013313 - 390 - 426 - 426 - 426 - 426 - 426) nicolas cellier 09-19-09 20:55 |
Note: VW and Dolphin behave same as Squeak... VW (ReadWriteStream on: 'abc') next -> nil Dolphin (ReadWriteStream on: 'abc') next -> EndOfStreamError But using #with: leads to same results as using #on: and is thus different than Squeak. If I understand correctly, VW and Dolphin #with: are ANSI compliant, Squeak is not: ANSI says the stream initially has no future value (for read). |
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Issue History |
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| Date Modified | Username | Field | Change |
| 08-29-08 11:46 | norbertf | New Issue | |
| 08-29-08 12:32 | norbertf | Note Added: 0012537 | |
| 08-29-08 12:39 | norbertf | Issue Monitored: norbertf | |
| 10-01-08 01:35 | Keith_Hodges | Note Added: 0012711 | |
| 01-10-09 02:39 | Keith_Hodges | Status | new => feedback |
| 03-05-09 19:35 | nicolas cellier | Note Added: 0013007 | |
| 09-19-09 20:55 | nicolas cellier | Note Added: 0013313 | |
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