tolower(3) - NetBSD Manual Pages

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TOLOWER(3)              NetBSD Library Functions Manual             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.


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.


SEE ALSO

     isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3),
     islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3),
     stdio(3), toascii(3), toupper(3), ascii(7)


STANDARDS

     The tolower() function conforms to ANSI X3.159-1989 (``ANSI C89'').


CAVEATS

     The argument to tolower() must be EOF or representable as an unsigned
     char; otherwise, the behavior is undefined.

NetBSD 4.0                     December 24, 2004                    NetBSD 4.0