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

12       _tolower — transliterate uppercase characters to lowercase
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SYNOPSIS

15       #include <ctype.h>
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17       int _tolower(int c);
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DESCRIPTION

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

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

28       No errors are defined.
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30       The following sections are informative.
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EXAMPLES

33       None.
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APPLICATION USAGE

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

40       None.
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FUTURE DIRECTIONS

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

46       tolower(), isupper()
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48       The  Base  Definitions  volume  of  POSIX.1‐2017,  Chapter  7,  Locale,
49       <ctype.h>
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52       Portions of this text are reprinted and reproduced in  electronic  form
53       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
54       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
55       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
56       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
57       event of any discrepancy between this version and the original IEEE and
58       The Open Group Standard, the original IEEE and The Open Group  Standard
59       is  the  referee document. The original Standard can be obtained online
60       at http://www.opengroup.org/unix/online.html .
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62       Any typographical or formatting errors that appear  in  this  page  are
63       most likely to have been introduced during the conversion of the source
64       files to man page format. To report such errors,  see  https://www.ker‐
65       nel.org/doc/man-pages/reporting_bugs.html .
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69IEEE/The Open Group                  2017                         _TOLOWER(3P)
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