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In particular, vsscanf (...) will use __locale_charset (), which is contained in the same C module as setlocale (.) and lots of other locale-related functions (!). There might also be other factors leading to the bloat.
In any case, the result is that — unfortunately — one cannot write an MS-DOS tiny model program that uses vsscanf (...), because the code and data rapidly exceed 64 KiB (!).
51FA