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fixes ptr to cstring warnings[backport] (#20848)

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* fix =#13790 ptr char (+friends) should not implicitly convert to cstring

* Apply suggestions from code review

* first round; compiles on windows

* nimPreviewSlimSystem

* conversion is unsafe, cast needed

* fixes more tests

* fixes asyncnet

* another try another error

* last one

* true

* one more

* why bugs didn't show at once

* add `nimPreviewCstringConversion` switch

* typo

* fixes ptr to cstring warnings[backport]

* add fixes

Co-authored-by: xflywind <43030857+xflywind@users.noreply.github.com>
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ringabout 2022-11-16 17:22:51 +08:00 • committed by GitHub
commit 06cd15663d
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4
lib/std/private/win_setenv.nim
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@ -94,9 +94,9 @@ else:
var buf = newSeq[char](requiredSize + 1)
let buf2 = buf[0].addr
if wcstombs(buf2, wideName, csize_t(requiredSize + 1)) != high(csize_t):
var ptrToEnv = c_getenv(buf2)
var ptrToEnv = c_getenv(cast[cstring](buf2))
ptrToEnv[0] = '\0'
ptrToEnv = c_getenv(buf2)
ptrToEnv = c_getenv(cast[cstring](buf2))
ptrToEnv[1] = '='
# And now, we have to update the outer environment to have a proper empty value.