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add io.readChars overload (simpler, less error prone) (#16044)
* add simpler to use readChars overload * use new readChars overload * Update lib/wrappers/openssl.nim Co-authored-by: Andreas Rumpf <[email protected]> Co-authored-by: flywind <[email protected]>
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Original file line number | Diff line number | Diff line change |
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# xxx move to here other tests that belong here; io is a proper module | ||
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import std/os | ||
from stdtest/specialpaths import buildDir | ||
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block: # readChars | ||
let file = buildDir / "D20201118T205105.txt" | ||
let s = "he\0l\0lo" | ||
writeFile(file, s) | ||
defer: removeFile(file) | ||
let f = open(file) | ||
defer: close(f) | ||
let n = f.getFileInfo.blockSize | ||
var buf = newString(n) | ||
template fn = | ||
let n2 = f.readChars(buf) | ||
doAssert n2 == s.len | ||
doAssert buf[0..<n2] == s | ||
fn() | ||
setFilePos(f, 0) | ||
fn() | ||
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block: | ||
setFilePos(f, 0) | ||
var s2: string | ||
let nSmall = 2 | ||
for ai in buf.mitems: ai = '\0' | ||
var n2s: seq[int] | ||
while true: | ||
let n2 = f.readChars(toOpenArray(buf, 0, nSmall-1)) | ||
# xxx: maybe we could support: toOpenArray(buf, 0..nSmall) | ||
n2s.add n2 | ||
s2.add buf[0..<n2] | ||
if n2 == 0: | ||
break | ||
doAssert n2s == @[2,2,2,1,0] | ||
doAssert s2 == s |