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fseeko: Fix C++ test error on mingw.
author Bruno Haible <bruno@clisp.org>
date Mon, 05 Apr 2010 18:18:11 +0200
parents c2cbabec01dd
children 97fc9a21a8fb
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13169
b55181348b50 fseeko: Fix C++ test error on mingw.
Bruno Haible <bruno@clisp.org>
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1 # fflush.m4 serial 8
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2
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3 # Copyright (C) 2007-2010 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 int c;
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26 if (f == NULL)
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27 return 1;
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28 fd = fileno (f);
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29 if (fd < 0 || fread (buffer, 1, 5, f) != 5)
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30 return 2;
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31 /* For deterministic results, ensure f read a bigger buffer. */
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32 if (lseek (fd, 0, SEEK_CUR) == 5)
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33 return 3;
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34 /* POSIX requires fflush-fseek to set file offset of fd. This fails
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35 on BSD systems and on mingw. */
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36 if (fflush (f) != 0 || fseek (f, 0, SEEK_CUR) != 0)
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37 return 4;
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38 if (lseek (fd, 0, SEEK_CUR) != 5)
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39 return 5;
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40 /* Verify behaviour of fflush after ungetc. See
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41 <http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt> */
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42 /* Verify behaviour of fflush after a backup ungetc. This fails on
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43 mingw. */
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44 c = fgetc (f);
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45 ungetc (c, f);
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46 fflush (f);
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47 if (fgetc (f) != c)
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48 return 6;
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49 /* Verify behaviour of fflush after a non-backup ungetc. This fails
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50 on glibc 2.8 and on BSD systems. */
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51 c = fgetc (f);
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52 ungetc ('@', f);
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53 fflush (f);
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54 if (fgetc (f) != c)
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55 return 7;
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56 return 0;
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57 ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no],
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58 [dnl Pessimistically assume fflush is broken.
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59 gl_cv_func_fflush_stdin=no])
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60 rm conftest.txt
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61 ])
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62 if test $gl_cv_func_fflush_stdin = no; then
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63 gl_REPLACE_FFLUSH
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64 fi
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65 ])
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66
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67 AC_DEFUN([gl_REPLACE_FFLUSH],
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68 [
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69 AC_LIBOBJ([fflush])
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70 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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71 REPLACE_FFLUSH=1
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72 gl_PREREQ_FFLUSH
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73 gl_REPLACE_FSEEKO
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74 ])
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75
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76 # Prerequisites of lib/fflush.c.
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77 AC_DEFUN([gl_PREREQ_FFLUSH],
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78 [
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79 AC_REQUIRE([AC_C_INLINE])
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80 :
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81 ])