1#include "stdio_impl.h" 2 3int __overflow(FILE *f, int _c) 4{ 5 unsigned char c = _c; 6 if (!f->wend && __towrite(f)) return EOF; 7 if (f->wpos != f->wend && c != f->lbf) return *f->wpos++ = c; 8 if (f->write(f, &c, 1)!=1) return EOF; 9 return c; 10} 11