Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
TOLOWER(3)	       FreeBSD 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.	 The argument must be 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
     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.

SEE ALSO
     ctype(3), islower(3), towlower(3)

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

FreeBSD	11.2			 July 25, 2010			  FreeBSD 11.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=tolower&sektion=3&manpath=FreeBSD+11.2-RELEASE>

home | help