NAME
toupper, toupper_l
— lower case to upper case
letter conversion
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
toupper(int
c);
int
toupper_l(int
c, locale_t
locale);
DESCRIPTION
Thetoupper()
and
toupper_l()
functions convert a lower-case letter to the corresponding upper-case letter.
The argument must be representable as an unsigned char
or the value of EOF.
The _l-suffixed version takes an explicit locale argument, whereas the non-suffixed version uses the current global or per-thread locale.
RETURN VALUES
If the argument is a lower-case letter, the
toupper() and toupper_l()
functions return the corresponding upper-case letter if there is one;
otherwise, the argument is returned unchanged.
COMPATIBILITY
The 4.4BSD extension of accepting
arguments outside of the range of the unsigned char
type in locales with large character sets is considered obsolete and may not
be supported in future releases. The towupper() and
towupper_l() functions should be used instead.
SEE ALSO
ctype(3), ctype_l(3), isupper(3), towupper(3), towupper_l(3), xlocale(3)
STANDARDS
The toupper() function conforms to
ISO/IEC 9899:1990 (“ISO C90”).
The towupper_l() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).