View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0037958 | FPC | RTL | public | 2020-10-19 13:36 | 2020-10-22 14:39 |
| Reporter | Wolfgang Helbig | Assigned To | Florian | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | no change required | ||
| Platform | imac | OS | os x | ||
| Product Version | 3.2.0 | ||||
| Summary | 0037958: external data file fails to be assigned in ISO MODE. | ||||
| Description | According to the fpc-wiki https://wiki.freepascal.org/File_Handling_In_Pascal files will be assigned to external files if the external files appear on the command line. This works for text files but fails for data files. | ||||
| Steps To Reproduce | $ cat >isotest1.pas program isotest1 (file1, file2); var file1: text; file2: file of integer; begin reset(file1); readln(file1); rewrite(file2); write(file2, 5); end. $ fpc -Miso isotest1.pas $ cat >external.txt a $ isotest1 external.txt external.dat $ wc external.dat wc: external.dat: open: No such file or directory This file should be created! Text files are created. | ||||
| Tags | No tags attached. | ||||
| Fixed in Revision | |||||
| FPCOldBugId | |||||
| FPCTarget | - | ||||
| Attached Files |
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I don't understand your obsession to find wrong in code that is wrong to begin with, which is your code of course. you open a file, you need to close it. The OS automatically closes files and only will you see this with unbuffered io.. Text files have a cache buffer that needs to be purged and that happens with a close within the pascal program not the OS. personally if I need to bail out early on a program I can use HALT(x) and I don't expect it to attempt to write any more data to file if that is your way of control style then I think you should first purge the textfile first or at least close it and it will get purged to disk what ever documentation you are reading about pascal I think is misleading you, this isn't the old mainframe terminal pascal where all the IO was managed remotely.. |
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You were completely right about my "obsession". If I'd just want to code a my latest and best pascal program I couldn't care less about the need to close a file or whatever! But what I am doing differs from that task. I want to change pascal sources written in 1982, so they will be accepted by FPC. And I want to have as least changes as possible. And I'll reach that goal, if FPC is as close as possible to ISO-Pascal -- with same extensions needed of course. In standard Pascal there is no close or flush or assign. And if I can get by without these extensions, i'll use it. By the way, this feature is described in your wiki. See the link in my first note. By the way, the old Pascal compiler ran on a DEC-System 10 in Stanford. I am working on Donald E. Knuths typesetting system TeX. You might want to google for TeX-FPC. |
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And a third by the way: Text files are flushed automatically if they are mentioned in the program header and ISO mode is turned on. So I do not need close or flush or whatever. And nontext files need no flushing, because they are unbuffered. |
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I for one applaud Wolfgang Helbig for finding these - more often than not - subtle differences and bugs and it's bug reports like these that help to make mode ISO more correct. |
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If you search for corner cases, please test always with trunk. This one is fixed already in trunk. |
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Hi Florian, I just try to use all those features of FPC, that make the maintainance of TeX-FPC easier. So I stick with a stable release for the time being. I just don't have the capacity to debug both FPC and TeX. Thanks for answering my questions and for having fixed some of the errors already! |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2020-10-19 13:36 | Wolfgang Helbig | New Issue | |
| 2020-10-19 16:43 | jamie philbrook | Note Added: 0126415 | |
| 2020-10-19 17:10 | Wolfgang Helbig | Note Added: 0126416 | |
| 2020-10-19 17:50 | Wolfgang Helbig | Note Added: 0126418 | |
| 2020-10-20 10:32 | Sven Barth | Note Added: 0126420 | |
| 2020-10-20 22:07 | Florian | Assigned To | => Florian |
| 2020-10-20 22:07 | Florian | Status | new => resolved |
| 2020-10-20 22:07 | Florian | Resolution | open => no change required |
| 2020-10-20 22:07 | Florian | FPCTarget | => - |
| 2020-10-20 22:07 | Florian | Note Added: 0126433 | |
| 2020-10-22 13:55 | Wolfgang Helbig | Note Added: 0126457 | |
| 2020-10-22 14:39 | Wolfgang Helbig | Note Edited: 0126457 | View Revisions |
