Provided by: manpages-posix-dev_2013a-1_all bug

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()  macro shall be equivalent to tolower(c) except that the application shall
       ensure that the argument c is an uppercase letter.


RETURN VALUE
       Upon successful completion, _tolower() shall return the lowercase letter corresponding  to
       the argument passed.


ERRORS
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       Applications  should  use  the  tolower()  function  instead of the obsolescent _tolower()
       function.


RATIONALE
       None.


FUTURE DIRECTIONS
       The _tolower() function may be removed in a future version.


SEE ALSO
       tolower(), isupper()

       The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale, <ctype.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  Electrical  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.kernel.org/doc/man-pages/reporting_bugs.html .