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toupper(3posix)


NAME

   toupper, toupper_l --- transliterate lowercase characters to uppercase

SYNOPSIS

   #include <ctype.h>

   int toupper(int c);
   int toupper_l(int c, locale_t locale);

DESCRIPTION

   For toupper(): 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.12008 defers to the ISO C standard.

   The  toupper()  and  toupper_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  toupper()  or toupper_l() represents a lowercase
   letter, and there exists a corresponding uppercase 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 uppercase letter.

   All other arguments in the domain are returned unchanged.

   The  behavior is undefined if the locale argument to toupper_l() is the
   special locale object LC_GLOBAL_LOCALE or is not a valid locale  object
   handle.

RETURN VALUE

   Upon  successful completion, toupper() and toupper_l() shall return the
   uppercase 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.12008,  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
   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 .



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