TOLOWER(3P)                                         POSIX Programmer's Manual                                        TOLOWER(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       tolower - transliterate uppercase characters to lowercase

SYNOPSIS
       #include <ctype.h>

       int tolower(int c);


DESCRIPTION
       The  tolower()  function has as a domain a type int, the value of which is representable as an unsigned char or the value
       of EOF. If the argument has any other value, the behavior is undefined. If the argument of tolower() represents an upper-
       case  letter, and there exists a corresponding lowercase letter  (as defined by character type information in the program
       locale category LC_CTYPE ),  the result shall be the corresponding lowercase letter. All other arguments  in  the  domain
       are returned unchanged.

RETURN VALUE
       Upon  successful completion, tolower() shall return the lowercase letter corresponding to the argument passed; otherwise,
       it shall return the argument unchanged.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                   TOLOWER(3P)