fusl/src/stdio/__stdout_write.c

#include "stdio_impl.h"
#include <sys/ioctl.h>

size_t __stdout_write(FILE* f, const unsigned char* buf, size_t len) {
  struct winsize wsz;
  f->write = __stdio_write;
  if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TIOCGWINSZ, &wsz))
    f->lbf = -1;
  return __stdio_write(f, buf, len);
}