1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
# ftello.m4 serial 11
dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_FTELLO],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
AC_REQUIRE([gl_SYS_TYPES_H])
dnl Persuade glibc <stdio.h> to declare ftello().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([ftello])
if test $ac_cv_have_decl_ftello = no; then
HAVE_DECL_FTELLO=0
fi
AC_CACHE_CHECK([for ftello], [gl_cv_func_ftello],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdio.h>]],
[[ftello (stdin);]])],
[gl_cv_func_ftello=yes],
[gl_cv_func_ftello=no])
])
if test $gl_cv_func_ftello = no; then
HAVE_FTELLO=0
else
if test $WINDOWS_64_BIT_OFF_T = 1; then
REPLACE_FTELLO=1
fi
if test $gl_cv_var_stdin_large_offset = no; then
REPLACE_FTELLO=1
fi
if test $REPLACE_FTELLO = 0; then
dnl Detect bug on Solaris.
dnl ftell and ftello produce incorrect results after putc that followed a
dnl getc call that reached EOF on Solaris. This is because the _IOREAD
dnl flag does not get cleared in this case, even though _IOWRT gets set,
dnl and ftell and ftello look whether the _IOREAD flag is set.
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_CHECK([whether ftello works],
[gl_cv_func_ftello_works],
[
dnl Initial guess, used when cross-compiling or when /dev/tty cannot
dnl be opened.
changequote(,)dnl
case "$host_os" in
# Guess no on Solaris.
solaris*) gl_cv_func_ftello_works="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_ftello_works="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define TESTFILE "conftest.tmp"
int
main (void)
{
FILE *fp;
/* Create a file with some contents. */
fp = fopen (TESTFILE, "w");
if (fp == NULL)
return 70;
if (fwrite ("foogarsh", 1, 8, fp) < 8)
return 71;
if (fclose (fp))
return 72;
/* The file's contents is now "foogarsh". */
/* Try writing after reading to EOF. */
fp = fopen (TESTFILE, "r+");
if (fp == NULL)
return 73;
if (fseek (fp, -1, SEEK_END))
return 74;
if (!(getc (fp) == 'h'))
return 1;
if (!(getc (fp) == EOF))
return 2;
if (!(ftell (fp) == 8))
return 3;
if (!(ftell (fp) == 8))
return 4;
if (!(putc ('!', fp) == '!'))
return 5;
if (!(ftell (fp) == 9))
return 6;
if (!(fclose (fp) == 0))
return 7;
fp = fopen (TESTFILE, "r");
if (fp == NULL)
return 75;
{
char buf[10];
if (!(fread (buf, 1, 10, fp) == 9))
return 10;
if (!(memcmp (buf, "foogarsh!", 9) == 0))
return 11;
}
if (!(fclose (fp) == 0))
return 12;
/* The file's contents is now "foogarsh!". */
return 0;
}]])],
[gl_cv_func_ftello_works=yes],
[gl_cv_func_ftello_works=no], [:])
])
case "$gl_cv_func_ftello_works" in
*yes) ;;
*)
REPLACE_FTELLO=1
AC_DEFINE([FTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE], [1],
[Define to 1 if the system's ftello function has the Solaris bug.])
;;
esac
fi
fi
])
# Prerequisites of lib/ftello.c.
AC_DEFUN([gl_PREREQ_FTELLO],
[
dnl Native Windows has the function _ftelli64. mingw hides it, but mingw64
dnl makes it usable again.
AC_CHECK_FUNCS([_ftelli64])
])
|
