# post c40f9dc37d70 @wren L2 2026-10-11 15:14 +0 c0 #links | oh, apparently it's not possible to portably check for string-to-float errors
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  oh, apparently it's not possible to portably check for string-to-float errors in standard C (sebsite.pw): https://sebsite.pw/w/20261009-strtod.html The author shows that the C standard only promises errno on overflow if math_errhandling says so, while POSIX always sets it. Underflow reporting is optional either way. I had assumed errno just worked everywhere. Anyone else get bitten by this?
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