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Put system dependent routines into inline functions.
author Bruno Haible <bruno@clisp.org>
date Sat, 26 Apr 2008 16:42:17 +0200
parents fc76a5b22f64
children 95eb3a6eb21d
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9976
621cb9082339 Put system dependent routines into inline functions.
Bruno Haible <bruno@clisp.org>
parents: 9818
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1 # fflush.m4 serial 6
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2
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3 # Copyright (C) 2007-2008 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 dnl From Eric Blake
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9
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10 dnl Find out how to obey POSIX semantics of fflush(stdin) discarding
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11 dnl unread input on seekable streams, rather than C99 undefined semantics.
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12
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13 AC_DEFUN([gl_FUNC_FFLUSH],
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14 [
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15 AC_CACHE_CHECK([whether fflush works on input streams],
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16 [gl_cv_func_fflush_stdin],
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17 [echo hello world > conftest.txt
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18 AC_RUN_IFELSE([AC_LANG_PROGRAM(
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19 [[
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20 #include <stdio.h>
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21 #include <unistd.h>
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22 ]], [[FILE *f = fopen ("conftest.txt", "r");
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23 char buffer[10];
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24 int fd;
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25 if (f == NULL)
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26 return 1;
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27 fd = fileno (f);
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28 if (fd < 0 || fread (buffer, 1, 5, f) != 5)
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29 return 2;
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30 /* For deterministic results, ensure f read a bigger buffer. */
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31 if (lseek (fd, 0, SEEK_CUR) == 5)
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32 return 3;
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33 /* POSIX requires fflush-fseek to set file offset of fd. */
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34 if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
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35 return 4;
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36 if (lseek (fd, 0, SEEK_CUR) != 5)
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37 return 5;
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38 /* TODO: Verify behaviour of fflush after ungetc, see
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39 <http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>. */
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40 return 0;
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41 ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
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42 [dnl Pessimistically assume fflush is broken. This is wrong for
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43 dnl at least glibc and cygwin; but lib/fflush.c takes this into account.
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44 gl_cv_func_fflush_stdin=no])
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45 rm conftest.txt
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46 ])
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47 if test $gl_cv_func_fflush_stdin = no; then
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48 gl_REPLACE_FFLUSH
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49 fi
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50 ])
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51
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52 AC_DEFUN([gl_REPLACE_FFLUSH],
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53 [
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54 AC_LIBOBJ([fflush])
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55 AC_LIBOBJ([fseeko])
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56 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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57 REPLACE_FFLUSH=1
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58 REPLACE_FSEEKO=1
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59 gl_PREREQ_FFLUSH
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60 ])
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61
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62 # Prerequisites of lib/fflush.c.
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63 AC_DEFUN([gl_PREREQ_FFLUSH],
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64 [
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65 AC_REQUIRE([AC_C_INLINE])
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66 :
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67 ])