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fixes #23304; uses snprintf instead of sprintf (#23322)

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fixes #23304

(cherry picked from commit dfd778d056)
This commit is contained in:
ringabout
2024-02-20 14:28:45 +08:00
committed by narimiran
parent 845be91df5
commit 6d38eafda1
4 changed files with 12 additions and 9 deletions
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6
lib/std/formatfloat.nim
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@@ -35,8 +35,8 @@ proc writeFloatToBufferRoundtrip*(buf: var array[65, char]; value: float32): int
result = float32ToChars(buf, value, forceTrailingDotZero=true).int
buf[result] = '\0'
proc c_sprintf(buf, frmt: cstring): cint {.header: "<stdio.h>",
importc: "sprintf", varargs, noSideEffect.}
proc c_snprintf(buf: cstring, n: csize_t, frmt: cstring): cint {.header: "<stdio.h>",
importc: "snprintf", varargs, noSideEffect.}
proc writeToBuffer(buf: var array[65, char]; value: cstring) =
var i = 0
@@ -49,7 +49,7 @@ proc writeFloatToBufferSprintf*(buf: var array[65, char]; value: BiggestFloat):
##
## returns the amount of bytes written to `buf` not counting the
## terminating '\0' character.
var n = c_sprintf(cast[cstring](addr buf), "%.16g", value).int
var n = c_snprintf(cast[cstring](addr buf), 65, "%.16g", value).int
var hasDot = false
for i in 0..n-1:
if buf[i] == ',':