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

   1 #include "stdio_impl.h"
   2 #include <sys/ioctl.h>
   3 #ifdef __wasilibc_unmodified_upstream
   4 #else
   5 #include <__function___isatty.h>
   6 #endif
   7
   8 size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
   9 {
  10 #ifdef __wasilibc_unmodified_upstream // isatty
  11         struct winsize wsz;
  12 #endif
  13         f->write = __stdio_write;
  14 #ifdef __wasilibc_unmodified_upstream // isatty
  15         if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TIOCGWINSZ, &wsz))
  16 #else
  17         if (!(f->flags & F_SVB) && !__isatty(f->fd))
  18 #endif
  19                 f->lbf = -1;
  20         return __stdio_write(f, buf, len);
  21 }