1_TOLOWER(3P)               POSIX Programmer's Manual              _TOLOWER(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       _tolower — transliterate uppercase characters to lowercase
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SYNOPSIS

16       #include <ctype.h>
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18       int _tolower(int c);
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DESCRIPTION

21       The _tolower() macro shall be equivalent to tolower(c) except that  the
22       application shall ensure that the argument c is an uppercase letter.
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RETURN VALUE

25       Upon  successful completion, _tolower() shall return the lowercase let‐
26       ter corresponding to the argument passed.
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ERRORS

29       No errors are defined.
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31       The following sections are informative.
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EXAMPLES

34       None.
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APPLICATION USAGE

37       Applications should use the tolower() function instead of the  obsoles‐
38       cent _tolower() function.
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RATIONALE

41       None.
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FUTURE DIRECTIONS

44       The _tolower() function may be removed in a future version.
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SEE ALSO

47       tolower(), isupper()
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49       The  Base  Definitions  volume  of  POSIX.1‐2008,  Chapter  7,  Locale,
50       <ctype.h>
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53       Portions of this text are reprinted and reproduced in  electronic  form
54       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
55       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
56       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
57       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
58       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
59       event of any discrepancy between this version and the original IEEE and
60       The  Open Group Standard, the original IEEE and The Open Group Standard
61       is the referee document. The original Standard can be  obtained  online
62       at http://www.unix.org/online.html .
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64       Any  typographical  or  formatting  errors that appear in this page are
65       most likely to have been introduced during the conversion of the source
66       files  to  man page format. To report such errors, see https://www.ker‐
67       nel.org/doc/man-pages/reporting_bugs.html .
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71IEEE/The Open Group                  2013                         _TOLOWER(3P)
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