tolower(3p) - phpMan

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  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 argu-
       ment has any other value, the behavior is undefined. If the argument of
       tolower()  represents  an  uppercase  letter, and there exists a corre-
       sponding lowercase letter  (as defined by character type information in
       the program locale category LC_CTYPE ),  the result shall be the corre-
       sponding 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, Chap-
       ter 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,  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)