Mercurial > hg > octave-kai > gnulib-hg

annotate m4/fflush.m4 @ 14938:e45dcf244493

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
fflush: Move AC_LIBOBJ invocations to module description. * m4/fflush.m4 (gl_REPLACE_FFLUSH): Remove macro. (gl_FUNC_FFLUSH): Inline it here. Move AC_LIBOBJ and gl_PREREQ_FFLUSH invocations from here... * modules/fflush (configure.ac): ... to here.
author Bruno Haible <bruno@clisp.org>
date Fri, 06 May 2011 13:21:22 +0200
parents ae72d1a5b3d6
children f62f29997e98
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14938
e45dcf244493 fflush: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
parents: 14697
diff changeset
1 # fflush.m4 serial 12
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
2
14079
97fc9a21a8fb maint: update almost all copyright ranges to include 2011
Jim Meyering <meyering@redhat.com>
parents: 13169
diff changeset
3 # Copyright (C) 2007-2011 Free Software Foundation, Inc.
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
4 # This file is free software; the Free Software Foundation
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
5 # gives unlimited permission to copy and/or distribute it,
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
6 # with or without modifications, as long as this notice is preserved.
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
7
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
8 dnl From Eric Blake
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
9
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
10 dnl Find out how to obey POSIX semantics of fflush(stdin) discarding
8699
996bed2dc377 Make fflush rely on fpurge.
Eric Blake <ebb9@byu.net>
parents: 8657
diff changeset
11 dnl unread input on seekable streams, rather than C99 undefined semantics.
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
12
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
13 AC_DEFUN([gl_FUNC_FFLUSH],
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
14 [
14938
e45dcf244493 fflush: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
parents: 14697
diff changeset
15 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
14696
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
16 gl_FUNC_FFLUSH_STDIN
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
17 if test $gl_cv_func_fflush_stdin = no; then
14938
e45dcf244493 fflush: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
parents: 14697
diff changeset
18 REPLACE_FFLUSH=1
14696
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
19 fi
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
20 ])
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
21
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
22 dnl Determine whether fflush works on input streams.
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
23 dnl Sets gl_cv_func_fflush_stdin.
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
24
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
25 AC_DEFUN([gl_FUNC_FFLUSH_STDIN],
0fa7da6f7a52 fflush, fseeko: Respect rules for use of AC_LIBOBJ.
Bruno Haible <bruno@clisp.org>
parents: 14678
diff changeset
26 [
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
27 AC_CACHE_CHECK([whether fflush works on input streams],
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
28 [gl_cv_func_fflush_stdin],
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
29 [echo hello world > conftest.txt
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
30 AC_RUN_IFELSE([AC_LANG_PROGRAM(
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
31 [[
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
32 #include <stdio.h>
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
33 #include <unistd.h>
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
34 ]], [[FILE *f = fopen ("conftest.txt", "r");
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
35 char buffer[10];
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
36 int fd;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
37 int c;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
38 if (f == NULL)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
39 return 1;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
40 fd = fileno (f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
41 if (fd < 0 || fread (buffer, 1, 5, f) != 5)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
42 return 2;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
43 /* For deterministic results, ensure f read a bigger buffer. */
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
44 if (lseek (fd, 0, SEEK_CUR) == 5)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
45 return 3;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
46 /* POSIX requires fflush-fseek to set file offset of fd. This fails
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
47 on BSD systems and on mingw. */
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
48 if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
49 return 4;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
50 if (lseek (fd, 0, SEEK_CUR) != 5)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
51 return 5;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
52 /* Verify behaviour of fflush after ungetc. See
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
53 <http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
54 /* Verify behaviour of fflush after a backup ungetc. This fails on
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
55 mingw. */
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
56 c = fgetc (f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
57 ungetc (c, f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
58 fflush (f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
59 if (fgetc (f) != c)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
60 return 6;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
61 /* Verify behaviour of fflush after a non-backup ungetc. This fails
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
62 on glibc 2.8 and on BSD systems. */
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
63 c = fgetc (f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
64 ungetc ('@', f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
65 fflush (f);
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
66 if (fgetc (f) != c)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
67 return 7;
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
parents: 11017
diff changeset
68 return 0;
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
69 ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
11017
95eb3a6eb21d Make fflush-after-ungetc POSIX compliant on glibc systems.
Bruno Haible <bruno@clisp.org>
parents: 9976
diff changeset
70 [dnl Pessimistically assume fflush is broken.
8657
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
71 gl_cv_func_fflush_stdin=no])
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
72 rm conftest.txt
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
73 ])
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
74 ])
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
75
9976
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
76 # Prerequisites of lib/fflush.c.
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
77 AC_DEFUN([gl_PREREQ_FFLUSH],
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
78 [
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
79 AC_REQUIRE([AC_C_INLINE])
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
80 :
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
diff changeset
81 ])