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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 repre- sentable 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() functions return the corresponding upper-case letter if there is one; otherwise, 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 obsolete and may not be supported in future releases. The towupper() or towupper_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 14.3 December 19, 2022 TOUPPER(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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