toupper man page on Archlinux

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TOUPPER(3)		   Linux Programmer's Manual		    TOUPPER(3)

       toupper, tolower, toupper_l, tolower_l - convert uppercase or lowercase

       #include <ctype.h>

       int toupper(int c);
       int tolower(int c);

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       toupper_l(), tolower_l():
	   Since glibc 2.10:
		  _XOPEN_SOURCE >= 700
	   Before glibc 2.10:

       These functions convert lowercase letters to uppercase, and vice versa.

       If c is a lowercase letter, toupper() returns its uppercase equivalent,
       if an uppercase representation exists in the  current  locale.	Other‐
       wise,  it  returns c.  The toupper_l() function performs the same task,
       but uses the locale referred to by the locale handle locale.

       If c is a uppercase letter, tolower() returns its lowercase equivalent,
       if a lowercase representation exists in the current locale.  Otherwise,
       it returns c.  The tolower_l() function performs	 the  same  task,  but
       uses the locale referred to by the locale handle locale.

       If  c  is neither an unsigned char value nor EOF, the behavior of these
       functions is undefined.

       The behavior of toupper_l() and tolower_l() is undefined if  locale  is
       the special locale object LC_GLOBAL_LOCALE (see duplocale(3)) or is not
       a valid locale object handle.

       The value returned is that of the converted letter, or c if the conver‐
       sion was not possible.

   Multithreading (see pthreads(7))
       The  toupper() and tolower() functions are thread-safe with exceptions.
       These functions can be safely used in  multithreaded  applications,  as
       long  as	 setlocale(3)  is not called to change the locale during their

       toupper(), tolower(): C89, C99, 4.3BSD, POSIX.1-2001, POSIX.1-2008.

       toupper_l(), tolower_l(): POSIX.1-2008.

       The details of what constitutes an uppercase or lowercase letter depend
       on the locale.  For example, the default "C" locale does not know about
       umlauts, so no conversion is done for them.

       In some non-English locales, there are lowercase letters with no corre‐
       sponding uppercase equivalent; the German sharp s is one example.

       isalpha(3),   newlocale(3),  setlocale(3),  uselocale(3),  towlower(3),
       towupper(3), locale(7)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2014-03-18			    TOUPPER(3)

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