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tolower(3)

NAME

     tolower -- upper case to lower case letter conversion

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     tolower(int c);

DESCRIPTION

     The tolower() function converts an upper-case letter to the corresponding
     lower-case letter.  For single C chars locales (see multibyte(3)) the
     value of the argument is representable as an unsigned char or the value
     of EOF.

RETURN VALUES

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

COMPATIBILITY

     Although tolower() accepts arguments outside of the range of the unsigned
     char type in locales with large character sets, this is a 4.4BSD exten-
     sion and the towlower() function should be used instead for maximum
     portability.

SEE ALSO

     ctype(3), islower(3), multibyte(3), towlower(3)

STANDARDS

     The tolower() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

FreeBSD 5.4			October 3, 2002 		   FreeBSD 5.4

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