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#include "stdio_impl.h" int __overflow(FILE *f, int _c) { unsigned char c = _c; if (!f->wend && __towrite(f)) return EOF; if (f->wpos < f->wend && c != f->lbf) return *f->wpos++ = c; if (f->write(f, &c, 1)!=1) return EOF; return c; }