editing FcConfig in code

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Some fonts aren't matched by fontconfig correctly e.g: the Amber Whiskey family has 4 faces Regular, Aged, Full Color, Shadow. `fc-match "Amber Whiskey"` outputs "Aged" instead of "Regular", And since Pango relies on fontconfig for that, it also exhibits the same behavior (e.g: Inkscape an gimp, both rely on pango, would pick the "Aged" variant). This could be worked around with a rule:

<match target="pattern">
    <test name="family">
        <string>Amber Whiskey</string>
    <edit name="style">

My question is how can i do that but in code (in C), that is
how can i check what fc-match would output, then if the output is wrong add a rule like the following to the FcConfig?

I'm open to suggestions if there are better ways.

I did read the docs but i couldn't figure out how.

The man page for FcFontMatch says that it should only be called after FcConfigSubstitute and FcDefaultSubstitute have been called for
the pattern, i don't understand what that means exactly.

Thanks a lot.

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