TOLOWER(3) Library Functions Manual TOLOWER(3)

tolower, tolower_lupper case to lower case letter conversion

Standard C Library (libc, -lc)

#include <ctype.h>

int
tolower(int c);

#include <ctype.h>
#include <xlocale.h>

int
tolower_l(int c, locale_t loc);

The () function converts an upper-case letter to the corresponding lower-case letter. The argument must be representable as an unsigned char or the value of EOF.

Although the () function uses the current locale, the () function may be passed a locale directly. See xlocale(3) for more information.

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

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() function should be used instead.

ctype(3), islower(3), towlower(3), xlocale(3)

The tolower() function conforms to ISO/IEC 9899:1990 (“ISO C90”).

July 17, 2005 Mac OS X 12