Guardian Native C Library Calls Reference Manual (G06.28+, H06.05+)

_toupper(3) Guardian Native C Library Calls Ref
erence Manual
NAME
_toupper - Translates lowercase characters to uppercase characters
LIBRARY
G-series native Guardian processes: $SYSTEM.SYSnn.ZCRTLSRL
G-series native OSS processes: /G/system/sysnn/zcrtlsrl
H-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCRTLDLL
H-series OSS processes: /G/system/zdllnnn/zcrtldll
SYNOPSIS
#include <ctype.h>
int _toupper (
int c);
PARAMETERS
c Specifies the character to be converted.
DESCRIPTION
The _toupper( ) macro translates all characters, including multibyte characters, to their specified
character values.
The toupper() macro takes an int value that can be represented as an unsigned char or the value
of EOF (defined in the stdio.h header file) as its input.
When the input of the _toupper() macro expresses a lowercase letter, as defined by character
type information in the program locale (category LC_CTYPE), the corresponding uppercase
letter is returned.
In the C locale, or in a locale where case-conversion information is not defined, the _toupper()
macro determines the case of characters according to the rules of the ASCII-coded character set.
NOTES
The _toupper( ) macro is equivalent to the toupper( ) function, but executes faster. If the value
of the c parameter to the _toupper() macro does not have a corresponding uppercase character,
the results of the function are undefined.
The LC_CTYPE category of the setlocale() function affects all conversions. See the setlo-
cale() function for more information.
RETURN VALUES
When the c parameter is a character for which the islower() function is TRUE, there is a
corresponding character for which the isupper( ) function is also TRUE. That uppercase charac-
ter is returned by the _toupper() macro. Otherwise, the c parameter is returned.
RELATED INFORMATION
Functions: setlocale(3), tolower(3), _tolower(3), toupper(3).
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