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    Command:

    toupper_l

    
    
    

    SYNOPSIS

           #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:
                      _GNU_SOURCE
    
    
    

    DESCRIPTION

           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, toupper() 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.
    
    
    

    RETURN VALUE

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

    ATTRIBUTES

       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
           execution.
    
    
    

    CONFORMING TO

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

    GNU 2014-03-18 TOUPPER(3)

    
    
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