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 (consult the correspond-
       ing 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 uppercase 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 Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (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.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							       TOLOWER(3P)