TEST(stdio_ext, __flbf) {
FILE* fp = fopen("/proc/version", "r");
ASSERT_FALSE(__flbf(fp));
char buf[128];
ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
ASSERT_TRUE(__flbf(fp));
fclose(fp);
}
int main(void)
{
if (isatty(0)) {
fprintf(stderr,"Hit Ctrl-d to initialise stdin\n");
} else {
fprintf(stderr,"Initialising stdin\n");
}
char data[4096];
fread(data,sizeof(data),1,stdin);
if (isatty(1)) {
fprintf(stdout,"Initialising stdout\n");
} else {
fprintf(stdout,"Initialising stdout\n");
fprintf(stderr,"Initialising stdout\n");
}
fprintf(stderr,"Initialising stderr\n"); //redundant
int i;
for (i=0; i<3; i++) {
fprintf(stderr,"%6s: tty=%d, lb=%d, size=%d\n",
fileno2name(i),
isatty(i),
__flbf(fileno2FILE(i))?1:0,
__fbufsize(fileno2FILE(i)));
}
return EXIT_SUCCESS;
}
int
fbufmode (FILE *fp)
{
/* Most systems provide FILE as a struct and the necessary bitmask in
<stdio.h>, because they need it for implementing getc() and putc() as
fast macros. */
#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
# if HAVE___FLBF /* glibc >= 2.2 */
if (__flbf (fp))
return _IOLBF;
# else
if (fp->_flags & _IO_LINE_BUF)
return _IOLBF;
# endif
if (fp->_flags & _IO_UNBUFFERED)
return _IONBF;
return _IOFBF;
#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Android */
if (fp_->_flags & __SLBF)
return _IOLBF;
if (fp_->_flags & __SNBF)
return _IONBF;
return _IOFBF;
#elif defined __EMX__ /* emx+gcc */
return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
#elif defined __minix /* Minix */
return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
# if HAVE___FLBF /* Solaris >= 7 */
if (__flbf (fp))
return _IOLBF;
# else
if (fp->_flag & _IOLBF)
return _IOLBF;
# endif
if (fp_->_flag & _IONBF)
return _IONBF;
return _IOFBF;
#elif defined __UCLIBC__ /* uClibc */
if (fp->__modeflags & __FLAG_LBF)
return _IOLBF;
if (fp->__modeflags & __FLAG_NBF)
return _IONBF;
return _IOFBF;
#elif defined __QNX__ /* QNX */
if (fp->_Mode & 0x400 /* _MLBF */)
return _IOLBF;
if (fp->_Mode & 0x800 /* _MNBF */)
return _IONBF;
return _IOFBF;
#elif defined __MINT__ /* Atari FreeMiNT */
if (fp->__linebuf)
return _IOLBF;
return (fp->__bufsize > 0 ? _IOFBF : _IONBF);
#elif HAVE___FLBF && HAVE___FBUFSIZE /* musl libc */
if (__flbf (fp))
return _IOLBF;
return (__fbufsize (fp) > 0 ? _IOFBF : _IONBF);
#elif defined EPLAN9 /* Plan9 */
if (fp->flags & 2 /* LINEBUF */)
return _IOLBF;
if (fp->bufl)
return _IOFBF;
return _IONBF;
#else
# error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf implementation."
#endif
}
