_toupper - transliterate lowercase characters to uppercase
[OB XSI] #include <ctype.h>
int _toupper(int c);
The _toupper() macro shall be equivalent to toupper() except that the application shall ensure that the argument c is a lowercase letter.
Upon successful completion, _toupper() shall return the uppercase letter corresponding to the argument passed.
No errors are defined.
Applications should use the toupper() function instead of the obsolescent _toupper() function.
The _toupper() function may be removed in a future version.
XBD Locale, <ctype.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
The normative text is updated to avoid use of the term "must" for application requirements.
The _toupper() function is marked obsolescent.
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