# fflush.m4 serial 7
-# Copyright (C) 2007-2009 Free Software Foundation, Inc.
+# Copyright (C) 2007-2010 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
#include <stdio.h>
#include <unistd.h>
]], [[FILE *f = fopen ("conftest.txt", "r");
- char buffer[10];
- int fd;
- int c;
- if (f == NULL)
- return 1;
- fd = fileno (f);
- if (fd < 0 || fread (buffer, 1, 5, f) != 5)
- return 2;
- /* For deterministic results, ensure f read a bigger buffer. */
- if (lseek (fd, 0, SEEK_CUR) == 5)
- return 3;
- /* POSIX requires fflush-fseek to set file offset of fd. This fails
- on BSD systems and on mingw. */
- if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
- return 4;
- if (lseek (fd, 0, SEEK_CUR) != 5)
- return 5;
- /* Verify behaviour of fflush after ungetc. See
- <http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */
- /* Verify behaviour of fflush after a backup ungetc. This fails on
- mingw. */
- c = fgetc (f);
- ungetc (c, f);
- fflush (f);
- if (fgetc (f) != c)
- return 6;
- /* Verify behaviour of fflush after a non-backup ungetc. This fails
- on glibc 2.8 and on BSD systems. */
- c = fgetc (f);
- ungetc ('@', f);
- fflush (f);
- if (fgetc (f) != c)
- return 7;
- return 0;
+ char buffer[10];
+ int fd;
+ int c;
+ if (f == NULL)
+ return 1;
+ fd = fileno (f);
+ if (fd < 0 || fread (buffer, 1, 5, f) != 5)
+ return 2;
+ /* For deterministic results, ensure f read a bigger buffer. */
+ if (lseek (fd, 0, SEEK_CUR) == 5)
+ return 3;
+ /* POSIX requires fflush-fseek to set file offset of fd. This fails
+ on BSD systems and on mingw. */
+ if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
+ return 4;
+ if (lseek (fd, 0, SEEK_CUR) != 5)
+ return 5;
+ /* Verify behaviour of fflush after ungetc. See
+ <http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */
+ /* Verify behaviour of fflush after a backup ungetc. This fails on
+ mingw. */
+ c = fgetc (f);
+ ungetc (c, f);
+ fflush (f);
+ if (fgetc (f) != c)
+ return 6;
+ /* Verify behaviour of fflush after a non-backup ungetc. This fails
+ on glibc 2.8 and on BSD systems. */
+ c = fgetc (f);
+ ungetc ('@', f);
+ fflush (f);
+ if (fgetc (f) != c)
+ return 7;
+ return 0;
]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
[dnl Pessimistically assume fflush is broken.
gl_cv_func_fflush_stdin=no])