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 func- tions is undefined. RETURN VALUE The value returned is that of the converted letter, or c if the conver- sion 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 corre- sponding 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 3.27 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)
Generated by dwww version 1.11.3 on Thu Nov 28 20:27:18 CET 2013.