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10.46.68 strtold ¶

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/strtold.html

Gnulib module: strtold

Portability problems fixed by Gnulib:

• This function is missing on some platforms: NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, Solaris 9, older Cygwin 1.7.x, MSVC 9, Android 4.4.
• This function returns a struct, not a long double, on some platforms: HP-UX 11.31/hppa.
• This function always returns a wrong value on some platforms: mingw 5.0.
• This function allows whitespace between ‘e’ and the exponent on some platforms: HP-UX 11.31/ia64.
• This function returns the wrong end pointer for ‘-0x’ on some platforms: glibc-2.3.2, Mac OS X 10.5, Haiku.
• This function fails to parse Infinities and plain NaNs on some platforms: HP-UX 11.31/ia64.
• This function fails to parse ‘NaN()’ on some platforms: glibc-2.3.2, mingw, Haiku.
• This function parses ‘NaN(n-char-sequence)’, but returns the wrong end pointer on some platforms: glibc-2.3.2, mingw, Haiku.
• This function fails to parse C99 hexadecimal floating point on some platforms: mingw.
• In hexadecimal floats, this function allows whitespace between ‘p’ and the exponent on some platforms: HP-UX 11.31/ia64.
• This function fails to set errno upon underflow on some platforms: Cygwin 2.9.
• This function maps denormalized numbers to zero on some platforms: Haiku 2024.
• This function leaks memory on mingw 5.0 and allocates an unbounded amount of stack on mingw 9.0.

Portability problems not fixed by Gnulib:

• This function fails to set errno upon gradual underflow (resulting in a denormalized number) on some platforms: MSVC 14.
• The replacement function does not always return correctly rounded results.
• If no conversion could be performed, this function sets errno to EINVAL on some platforms. Portable programs should check for no conversion by comparing str to *endptr, not by inspecting errno.