Truncate a file: Difference between revisions
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<lang ocaml>val ftruncate : file_descr -> int -> unit |
<lang ocaml>val ftruncate : file_descr -> int -> unit |
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(** Truncates the file corresponding to the given descriptor to the given size. *)</lang> |
(** Truncates the file corresponding to the given descriptor to the given size. *)</lang> |
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=={{header|Liberty BASIC}}== |
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Note Liberty BASIC provides a way to exit a function. |
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<br> |
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It is also possible to call API functions to achieve this task. |
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<lang lb> |
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dim info$( 50, 50) ' NB pre-dimension before calling file-exists |
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' needed for file-exists function |
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open "test.dat" for output as #1 'create file |
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for i = 1 to 10000 |
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#1 chr$( int( 256 *rnd( 1))); |
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next |
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close #1 |
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call truncateFile, "test.dat", 5000 |
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wait |
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sub truncateFile fn$, length |
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if fileExists( DefaultDir$, fn$) =0 then notice "No such file": exit sub |
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open fn$ for input as #i |
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file$ =input$( #i, lof( #i)) |
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if len( file$) <length then notice "Too short": close #i: exit sub |
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file$ =left$( file$, length) |
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close #i |
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open "test.dat" for output as #o |
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#o file$ |
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close #o |
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end sub |
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function fileExists( path$, filename$) |
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files path$, filename$, info$() |
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fileExists =val( info$( 0, 0)) 'non zero is true |
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end function |
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end |
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</lang> |
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=={{header|PureBasic}}== |
=={{header|PureBasic}}== |
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