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getFileSize and setFileSize procedures for File and AsyncFile

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Platform independent procedure to set a file length. Useful when
replacing file content.
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Emery Hemingway 2017-04-04 20:26:59 -05:00
commit bc5c2d8414
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4 changed files with 34 additions and 5 deletions
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lib/system.nim
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@ -2895,6 +2895,9 @@ when not defined(JS): #and not defined(nimscript):
proc getFileSize*(f: File): int64 {.tags: [ReadIOEffect], benign.}
## retrieves the file size (in bytes) of `f`.
proc setFileSize*(f: File, size: int64) {.tags: [ReadIOEffect], benign.}
## changes the size of file `f` (in bytes).
proc readBytes*(f: File, a: var openArray[int8|uint8], start, len: Natural): int {.
tags: [ReadIOEffect], benign.}
## reads `len` bytes into the buffer `a` starting at ``a[start]``. Returns