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TOWUPPER(3) FreeBSD Library Functions Manual TOWUPPER(3)

towupper
lower case to upper case letter conversion (wide character version)

Standard C Library (libc, -lc)

#include <wctype.h>

wint_t
towupper(wint_t wc);

The towupper() function converts a lower-case letter to the corresponding upper-case letter.

If the argument is a lower-case letter, the towupper() function returns the corresponding upper-case letter if there is one; otherwise the argument is returned unchanged.

iswupper(3), toupper(3), towlower(3), wctrans(3)

The towupper() function conforms to ISO/IEC 9899:1999 (“ISO C99”).
October 3, 2002 FreeBSD 13.1-RELEASE

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