libc-top-half/musl/src/stdio/__overflow.c

   1 #include "stdio_impl.h"
   2
   3 int __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 }