TOLOWER(3) Library Functions Manual TOLOWER(3) NAME tolower, tolower_l -- upper case to lower case letter conversion LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int tolower(int c); int tolower_l(int c, locale_t loc); DESCRIPTION The tolower() and tolower_l() functions convert an upper-case letter to the corresponding lower-case letter. The argument must be representable as an unsigned char or the value of EOF. The tolower_l() function takes an explicit locale argument, whereas the tolower() function uses the current global or per-thread locale. RETURN VALUES If the argument is an upper-case letter, the tolower() and tolower_l() functions return the corresponding lower-case letter if there is one; oth- erwise, 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 towlower() or towlower_l() function should be used instead. SEE ALSO ctype(3), ctype_l(3), islower(3), islower_l(3), towlower(3), towlower_l(3), xlocale(3) STANDARDS The tolower() function conforms to ISO/IEC 9899:1990 ("ISO C90"). FreeBSD 15.1 December 19, 2022 TOLOWER(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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