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authorRincewindsHat <12514511+RincewindsHat@users.noreply.github.com>2023-01-31 14:46:01 +0100
committerRincewindsHat <12514511+RincewindsHat@users.noreply.github.com>2023-01-31 14:46:01 +0100
commite8bd88d1fcded01ccd066572eeaae1b507989cb3 (patch)
treec8e7be6c07c6f635f6e803e6a6ba9e7a95fee7c0 /gl/m4/ftello.m4
parent2ad962c13473607ca0d974bfaa516a0ed53ec73d (diff)
downloadmonitoring-plugins-e8bd88d1fcded01ccd066572eeaae1b507989cb3.tar.gz
Sync with the latest Gnulib code 668c0b8ffa
Diffstat (limited to 'gl/m4/ftello.m4')
-rw-r--r--gl/m4/ftello.m4151
1 files changed, 151 insertions, 0 deletions
diff --git a/gl/m4/ftello.m4 b/gl/m4/ftello.m4
new file mode 100644
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1# ftello.m4 serial 14
2dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_FTELLO],
8[
9 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
10 AC_REQUIRE([AC_PROG_CC])
11 AC_REQUIRE([gl_STDIN_LARGE_OFFSET])
12 AC_REQUIRE([gl_SYS_TYPES_H])
13
14 dnl Persuade glibc <stdio.h> to declare ftello().
15 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
16
17 AC_CHECK_DECLS_ONCE([ftello])
18 if test $ac_cv_have_decl_ftello = no; then
19 HAVE_DECL_FTELLO=0
20 fi
21
22 AC_CACHE_CHECK([for ftello], [gl_cv_func_ftello],
23 [
24 AC_LINK_IFELSE(
25 [AC_LANG_PROGRAM(
26 [[#include <stdio.h>]],
27 [[ftello (stdin);]])],
28 [gl_cv_func_ftello=yes],
29 [gl_cv_func_ftello=no])
30 ])
31 if test $gl_cv_func_ftello = no; then
32 HAVE_FTELLO=0
33 else
34 if test $WINDOWS_64_BIT_OFF_T = 1; then
35 REPLACE_FTELLO=1
36 fi
37 if test $gl_cv_var_stdin_large_offset = no; then
38 REPLACE_FTELLO=1
39 fi
40 if test $REPLACE_FTELLO = 0; then
41 dnl Detect bug on Solaris.
42 dnl ftell and ftello produce incorrect results after putc that followed a
43 dnl getc call that reached EOF on Solaris. This is because the _IOREAD
44 dnl flag does not get cleared in this case, even though _IOWRT gets set,
45 dnl and ftell and ftello look whether the _IOREAD flag is set.
46 AC_REQUIRE([AC_CANONICAL_HOST])
47 AC_CACHE_CHECK([whether ftello works],
48 [gl_cv_func_ftello_works],
49 [
50 dnl Initial guess, used when cross-compiling or when /dev/tty cannot
51 dnl be opened.
52changequote(,)dnl
53 case "$host_os" in
54 # Guess no on Solaris.
55 solaris*) gl_cv_func_ftello_works="guessing no" ;;
56 # Guess yes on native Windows.
57 mingw*) gl_cv_func_ftello_works="guessing yes" ;;
58 # Guess yes otherwise.
59 *) gl_cv_func_ftello_works="guessing yes" ;;
60 esac
61changequote([,])dnl
62 AC_RUN_IFELSE(
63 [AC_LANG_SOURCE([[
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#define TESTFILE "conftest.tmp"
68int
69main (void)
70{
71 FILE *fp;
72
73 /* Create a file with some contents. */
74 fp = fopen (TESTFILE, "w");
75 if (fp == NULL)
76 return 70;
77 if (fwrite ("foogarsh", 1, 8, fp) < 8)
78 { fclose (fp); return 71; }
79 if (fclose (fp))
80 return 72;
81
82 /* The file's contents is now "foogarsh". */
83
84 /* Try writing after reading to EOF. */
85 fp = fopen (TESTFILE, "r+");
86 if (fp == NULL)
87 return 73;
88 if (fseek (fp, -1, SEEK_END))
89 { fclose (fp); return 74; }
90 if (!(getc (fp) == 'h'))
91 { fclose (fp); return 1; }
92 if (!(getc (fp) == EOF))
93 { fclose (fp); return 2; }
94 if (!(ftell (fp) == 8))
95 { fclose (fp); return 3; }
96 if (!(ftell (fp) == 8))
97 { fclose (fp); return 4; }
98 if (!(putc ('!', fp) == '!'))
99 { fclose (fp); return 5; }
100 if (!(ftell (fp) == 9))
101 { fclose (fp); return 6; }
102 if (!(fclose (fp) == 0))
103 return 7;
104 fp = fopen (TESTFILE, "r");
105 if (fp == NULL)
106 return 75;
107 {
108 char buf[10];
109 if (!(fread (buf, 1, 10, fp) == 9))
110 { fclose (fp); return 10; }
111 if (!(memcmp (buf, "foogarsh!", 9) == 0))
112 { fclose (fp); return 11; }
113 }
114 if (!(fclose (fp) == 0))
115 return 12;
116
117 /* The file's contents is now "foogarsh!". */
118
119 return 0;
120}]])],
121 [gl_cv_func_ftello_works=yes],
122 [gl_cv_func_ftello_works=no], [:])
123 ])
124 case "$gl_cv_func_ftello_works" in
125 *yes) ;;
126 *)
127 REPLACE_FTELLO=1
128 AC_DEFINE([FTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE], [1],
129 [Define to 1 if the system's ftello function has the Solaris bug.])
130 ;;
131 esac
132 fi
133 if test $REPLACE_FTELLO = 0; then
134 dnl Detect bug on macOS >= 10.15.
135 gl_FUNC_UNGETC_WORKS
136 if test $gl_ftello_broken_after_ungetc = yes; then
137 REPLACE_FTELLO=1
138 AC_DEFINE([FTELLO_BROKEN_AFTER_UNGETC], [1],
139 [Define to 1 if the system's ftello function has the macOS bug.])
140 fi
141 fi
142 fi
143])
144
145# Prerequisites of lib/ftello.c.
146AC_DEFUN([gl_PREREQ_FTELLO],
147[
148 dnl Native Windows has the function _ftelli64. mingw hides it, but mingw64
149 dnl makes it usable again.
150 AC_CHECK_FUNCS([_ftelli64])
151])