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10.1303 wcsrtombs

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcsrtombs.html

Gnulib module: wcsrtombs

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, HP-UX 11.00, mingw.
• This function does not ignore the length argument if the destination argument is NULL on some platforms: mingw.
• This function updates the source pointer also if the destination argument is NULL on some platforms: HP-UX 11.

Portability problems not fixed by Gnulib:

• On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters. However, the Gnulib function c32srtombs, provided by Gnulib module c32srtombs, operates on 32-bit wide characters and therefore does not have this limitation.