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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, tolower_l -- transliterate uppercase characters to lowercase
SYNOPSIS
       #include <ctype.h>
       int tolower(int c);
       int tolower_l(int c, locale_t locale);
DESCRIPTION
       For tolower(): The functionality described on this  reference  page  is
       aligned  with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This volume  of
       POSIX.1-2008 defers to the ISO C standard.
       The  tolower()  and  tolower_l() functions have 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() or tolower_l() represents an  uppercase  let-
       ter,  and  there  exists a corresponding lowercase letter as defined by
       character type information in the current locale or in the locale  rep-
       resented  by locale, respectively (category LC_CTYPE), the result shall
       be the corresponding lowercase  letter.  All  other  arguments  in  the
       domain are returned unchanged.
       The  behavior is undefined if the locale argument to tolower_l() is the
       special locale object LC_GLOBAL_LOCALE or is not a valid locale  object
       handle.
RETURN VALUE
       Upon  successful  completion,  the  tolower() and tolower_l() functions
       shall return the lowercase letter corresponding to the argument passed;
       otherwise, they 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(), uselocale()
       The  Base  Definitions  volume  of  POSIX.1-2008,  Chapter  7,  Locale,
       <ctype.h>, <locale.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          TOLOWER(3P)