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Equivalent for dcraw -c?

This is document for dcraw -c:

Raw photo decoder "dcraw" v9.28
by Dave Coffin, dcoffin a cybercom o net
Usage:  dcraw [OPTION]... [FILE]...
-v        Print verbose messages
-c        Write image data to standard output

But -c is used for other purposes in libraw:

dcraw_emu: almost complete dcraw emulator
Usage:  dcraw_emu [OPTION]... [FILE]...
-c float-num       Set adjust maximum threshold (default 0.75)

How should I do the same thing in libraw? I need to use this for Imagemagick delegation. Thanks!