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GB.toupper
Syntax
int GB.toupper ( int c )

This is a locale insensitive replacement for the glibc toupper() function.

You must use this function instead of the standard glibc one to compare ASCII strings in a case unsensitive way, because the glibc one is localization aware.

And if you did not know yet, in turkish, strcasecmp("i", "I") != 0.

See also

String Management