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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 repre- sentable 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; 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 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 14.3 December 19, 2022 TOLOWER(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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