NAME toupper - lower case to upper case letter conversion CONTENTS Library Synopsis Description Return Values Compatibility See Also Standards LIBRARY .Lb libc SYNOPSIS .In ctype.h int toupper "int c" DESCRIPTION The toupper function converts a lower-case letter to the corresponding upper-case letter. For single C char s locales (see multibyte(3)) the value of the argument is representable as an unsigned char or the value of EOF. RETURN VALUES If the argument is a lower-case letter, the toupper function returns the corresponding upper-case letter if there is one; otherwise the argument is returned unchanged. COMPATIBILITY The BSD 4.4 extension of accepting arguments outside of the range of the .Vt "unsigned char" type in locales with large character sets is considered obsolete and may not be supported in future releases. The towupper function should be used instead. SEE ALSO ctype(3), isupper(3), multibyte(3), towupper(3) STANDARDS
