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TOUPPER(3) Library Functions Manual TOUPPER(3) NAME toupper, toupper_l -- lower case to upper case letter conversion LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int toupper(int c); int toupper_l(int c, locale_t loc); DESCRIPTION The toupper() and toupper_l() functions convert a lower-case letter to the corresponding upper-case letter. The argument must be representable as an unsigned char or the value of EOF. The toupper_l() function takes an explicit locale argument, whereas the toupper() function uses the current global or per-thread locale. RETURN VALUES If the argument is a lower-case letter, the toupper() and toupper_l() func- tions return the corresponding upper-case letter if there is one; other- wise, the argument is returned unchanged. COMPATIBILITY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obso- lete and may not be supported in future releases. The towupper() or towup- per_l() function should be used instead. SEE ALSO ctype(3), ctype_l(3), isupper(3), isupper_l(3), towupper(3), towupper_l(3), xlocale(3) STANDARDS The toupper() function conforms to ISO/IEC 9899:1990 ("ISO C90"). FreeBSD ports 15.1 December 19, 2022 TOUPPER(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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