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The rupshift() function changes all the characters within a null-terminated string to uppercase characters.
The rupshift() function refers to the current locale to determine uppercase and lowercase letters. For the default locale, U.S. English, rupshift() uses the ASCII lowercase (a-z) and uppercase (A-Z) letters.
If you use a nondefault locale, rupshift() uses the lowercase and uppercase letters that the locale defines. For more information, see the Informix Guide to GLS Functionality.