toupper man page on Scientific

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

       toupper, tolower - convert letter to upper or lower case

       #include <ctype.h>

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

       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 func‐
       tions is undefined.

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

       C89, C99, 4.3BSD.

       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 corre‐
       sponding uppercase equivalent; the German sharp s is one example.

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

       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  1993-04-04			    TOUPPER(3)

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