PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

TOLOWER(3P)               POSIX Programmer's Manual              TOLOWER(3P)

PROLOG         top

       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         top

       tolower, tolower_l — transliterate uppercase characters to lowercase

SYNOPSIS         top

       #include <ctype.h>

       int tolower(int c);
       int tolower_l(int c, locale_t locale);

DESCRIPTION         top

       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 letter, and there exists a corresponding lowercase letter
       as defined by character type information in the current locale or in
       the locale represented 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         top

       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         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       setlocale(3p), uselocale(3p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
       ctype.h(0p), locale.h(0p)

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013                         TOLOWER(3P)