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



NAME
       toupper, tolower - convert letter to upper or lower case

SYNOPSIS
       #include <ctype.h>

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

DESCRIPTION
       toupper() converts the letter c to upper case, if possible.

       tolower() converts the letter c to lower case, if possible.

       If c is not an unsigned char value, or EOF, the behavior of these functions is undefined.

RETURN VALUE
       The value returned is that of the converted letter, or c if the conversion was not possible.

CONFORMING TO
       C89, C99, 4.3BSD.

BUGS
       The  details of what constitutes an uppercase or lowercase letter depend on the current 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 corresponding uppercase equivalent; the German  sharp  s
       is one example.

SEE ALSO
       isalpha(3), setlocale(3), towlower(3), towupper(3), locale(7)

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        1993-04-04                                                 TOUPPER(3)