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annotate m4/mktime.m4 @ 14249:52b55b447c02

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TYPE_MAXIMUM: avoid theoretically undefined behavior * lib/intprops.h (TYPE_MINIMUM, TYPE_MAXIMUM): Do not shift a negative number, which the C Standard says has undefined behavior. In practice this is not a problem, but might as well do it by the book. Reported by Rich Felker and Eric Blake; see <http://lists.gnu.org/archive/html/bug-gnulib/2011-01/msg00493.html>. * lib/strtol.c (TYPE_MINIMUM, TYPE_MAXIMUM): Likewise. * m4/mktime.m4 (AC_FUNC_MKTIME): Likewise. * m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Likewise. * m4/parse-datetime.m4 (gl_PARSE_DATETIME): Likewise. * m4/stdint.m4 (gl_STDINT_H): Likewise. * lib/mktime.c (TYPE_MAXIMUM): Redo slightly to match the others.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 29 Jan 2011 23:59:31 -0800
parents 21a50d7b2537
children 5fcbe73883bf
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14249
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1 # serial 19
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2 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 Free Software Foundation,
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3 dnl Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7c1a6b73f48e An autoconf macro for its associated module.
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7
7c1a6b73f48e An autoconf macro for its associated module.
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8 dnl From Jim Meyering.
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9
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10 # Redefine AC_FUNC_MKTIME, because it is no longer maintained in Autoconf.
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11 # AC_FUNC_MKTIME
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12 # --------------
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13 AC_DEFUN([AC_FUNC_MKTIME],
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14 [AC_CHECK_HEADERS_ONCE([unistd.h])
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15 AC_CHECK_FUNCS_ONCE([alarm])
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16 AC_REQUIRE([gl_MULTIARCH])
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17 if test $APPLE_UNIVERSAL_BUILD = 1; then
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18 # A universal build on Apple MacOS X platforms.
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19 # The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode.
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20 # But we need a configuration result that is valid in both modes.
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21 ac_cv_func_working_mktime=no
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22 fi
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23 AC_CACHE_CHECK([for working mktime], [ac_cv_func_working_mktime],
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24 [AC_RUN_IFELSE([AC_LANG_SOURCE(
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25 [[/* Test program from Paul Eggert and Tony Leneis. */
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26 #include <limits.h>
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27 #include <stdlib.h>
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28 #include <time.h>
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30 #ifdef HAVE_UNISTD_H
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31 # include <unistd.h>
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32 #endif
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33
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34 #ifndef HAVE_ALARM
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35 # define alarm(X) /* empty */
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36 #endif
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37
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38 /* Work around redefinition to rpl_putenv by other config tests. */
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39 #undef putenv
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40
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41 static time_t time_t_max;
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42 static time_t time_t_min;
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43
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44 /* Values we'll use to set the TZ environment variable. */
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45 static char *tz_strings[] = {
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46 (char *) 0, "TZ=GMT0", "TZ=JST-9",
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47 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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48 };
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49 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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50
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51 /* Return 0 if mktime fails to convert a date in the spring-forward gap.
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52 Based on a problem report from Andreas Jaeger. */
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53 static int
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54 spring_forward_gap ()
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55 {
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56 /* glibc (up to about 1998-10-07) failed this test. */
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57 struct tm tm;
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58
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59 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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60 instead of "TZ=America/Vancouver" in order to detect the bug even
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61 on systems that don't support the Olson extension, or don't have the
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62 full zoneinfo tables installed. */
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63 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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64
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65 tm.tm_year = 98;
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66 tm.tm_mon = 3;
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67 tm.tm_mday = 5;
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68 tm.tm_hour = 2;
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69 tm.tm_min = 0;
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70 tm.tm_sec = 0;
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71 tm.tm_isdst = -1;
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72 return mktime (&tm) != (time_t) -1;
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73 }
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74
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75 static int
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76 mktime_test1 (time_t now)
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77 {
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78 struct tm *lt;
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79 return ! (lt = localtime (&now)) || mktime (lt) == now;
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80 }
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81
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82 static int
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83 mktime_test (time_t now)
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84 {
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85 return (mktime_test1 (now)
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86 && mktime_test1 ((time_t) (time_t_max - now))
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87 && mktime_test1 ((time_t) (time_t_min + now)));
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88 }
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89
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90 static int
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91 irix_6_4_bug ()
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92 {
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93 /* Based on code from Ariel Faigon. */
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94 struct tm tm;
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95 tm.tm_year = 96;
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96 tm.tm_mon = 3;
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97 tm.tm_mday = 0;
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98 tm.tm_hour = 0;
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99 tm.tm_min = 0;
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100 tm.tm_sec = 0;
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101 tm.tm_isdst = -1;
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102 mktime (&tm);
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103 return tm.tm_mon == 2 && tm.tm_mday == 31;
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104 }
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105
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106 static int
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107 bigtime_test (int j)
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108 {
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109 struct tm tm;
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110 time_t now;
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111 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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112 now = mktime (&tm);
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113 if (now != (time_t) -1)
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114 {
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115 struct tm *lt = localtime (&now);
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116 if (! (lt
12421
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117 && lt->tm_year == tm.tm_year
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118 && lt->tm_mon == tm.tm_mon
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119 && lt->tm_mday == tm.tm_mday
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120 && lt->tm_hour == tm.tm_hour
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121 && lt->tm_min == tm.tm_min
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122 && lt->tm_sec == tm.tm_sec
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Bruno Haible <bruno@clisp.org>
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123 && lt->tm_yday == tm.tm_yday
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124 && lt->tm_wday == tm.tm_wday
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125 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
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diff changeset
126 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
e8d2c6fc33ad Use spaces for indentation, not tabs.
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127 return 0;
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128 }
7276
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129 return 1;
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130 }
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131
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diff changeset
132 static int
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133 year_2050_test ()
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134 {
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135 /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
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diff changeset
136 ignoring leap seconds. */
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diff changeset
137 unsigned long int answer = 2527315200UL;
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138
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diff changeset
139 struct tm tm;
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140 time_t t;
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diff changeset
141 tm.tm_year = 2050 - 1900;
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142 tm.tm_mon = 2 - 1;
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143 tm.tm_mday = 1;
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144 tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
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diff changeset
145 tm.tm_isdst = -1;
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146
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diff changeset
147 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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diff changeset
148 instead of "TZ=America/Vancouver" in order to detect the bug even
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diff changeset
149 on systems that don't support the Olson extension, or don't have the
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diff changeset
150 full zoneinfo tables installed. */
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diff changeset
151 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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152
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diff changeset
153 t = mktime (&tm);
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154
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diff changeset
155 /* Check that the result is either a failure, or close enough
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
156 to the correct answer that we can assume the discrepancy is
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diff changeset
157 due to leap seconds. */
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diff changeset
158 return (t == (time_t) -1
12421
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159 || (0 < t && answer - 120 <= t && t <= answer + 120));
4348
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diff changeset
160 }
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diff changeset
161
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
162 int
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diff changeset
163 main ()
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164 {
13918
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165 int result = 0;
4348
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166 time_t t, delta;
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diff changeset
167 int i, j;
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
168 int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1;
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
169 int time_t_signed = ! ((time_t) 0 < (time_t) -1);
4348
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170
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diff changeset
171 /* This test makes some buggy mktime implementations loop.
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172 Give up after 60 seconds; a mktime slower than that
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173 isn't worth using anyway. */
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diff changeset
174 alarm (60);
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diff changeset
175
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
176 time_t_max = (! time_t_signed
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
177 ? (time_t) -1
14249
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
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178 : ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1)
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
Paul Eggert <eggert@cs.ucla.edu>
parents: 14245
diff changeset
179 * 2 + 1));
14245
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
180 time_t_min = (! time_t_signed
21a50d7b2537 mktime: avoid infinite loop
Eric Blake <eblake@redhat.com>
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diff changeset
181 ? (time_t) 0
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Eric Blake <eblake@redhat.com>
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diff changeset
182 : time_t_signed_magnitude
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Eric Blake <eblake@redhat.com>
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diff changeset
183 ? ~ (time_t) 0
14249
52b55b447c02 TYPE_MAXIMUM: avoid theoretically undefined behavior
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
184 : ~ time_t_max);
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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185
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diff changeset
186 delta = time_t_max / 997; /* a suitable prime number */
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diff changeset
187 for (i = 0; i < N_STRINGS; i++)
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
188 {
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diff changeset
189 if (tz_strings[i])
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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190 putenv (tz_strings[i]);
4348
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diff changeset
191
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diff changeset
192 for (t = 0; t <= time_t_max - delta; t += delta)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
193 if (! mktime_test (t))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
194 result |= 1;
7276
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
195 if (! (mktime_test ((time_t) 1)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
196 && mktime_test ((time_t) (60 * 60))
e8d2c6fc33ad Use spaces for indentation, not tabs.
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diff changeset
197 && mktime_test ((time_t) (60 * 60 * 24))))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
198 result |= 2;
4348
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diff changeset
199
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
200 for (j = 1; ; j <<= 1)
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
201 if (! bigtime_test (j))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
202 result |= 4;
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
203 else if (INT_MAX / 2 < j)
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
204 break;
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
205 if (! bigtime_test (INT_MAX))
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
206 result |= 8;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
207 }
13918
d5a74c6ec06b Put more information about failed tests into the test return codes.
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diff changeset
208 if (! irix_6_4_bug ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
209 result |= 16;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
210 if (! spring_forward_gap ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
211 result |= 32;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
parents: 13695
diff changeset
212 if (! year_2050_test ())
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
213 result |= 64;
d5a74c6ec06b Put more information about failed tests into the test return codes.
Bruno Haible <bruno@clisp.org>
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diff changeset
214 return result;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
215 }]])],
12421
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
216 [ac_cv_func_working_mktime=yes],
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
217 [ac_cv_func_working_mktime=no],
e8d2c6fc33ad Use spaces for indentation, not tabs.
Bruno Haible <bruno@clisp.org>
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diff changeset
218 [ac_cv_func_working_mktime=no])])
4348
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diff changeset
219 if test $ac_cv_func_working_mktime = no; then
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
220 AC_LIBOBJ([mktime])
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diff changeset
221 fi
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
222 ])# AC_FUNC_MKTIME
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
223
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
224 AC_DEFUN([gl_FUNC_MKTIME],
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
225 [
11742
531d4547f010 Fix compilation error when <ctime> is used and mktime is replaced.
Bruno Haible <bruno@clisp.org>
parents: 11068
diff changeset
226 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
7942
9b53e406b401 2007-01-24 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
parents: 7906
diff changeset
227 AC_FUNC_MKTIME
11007
f6cba5a556ce many *.m4 files: improve m4 quoting
Jim Meyering <meyering@redhat.com>
parents: 8427
diff changeset
228 dnl Note: AC_FUNC_MKTIME does AC_LIBOBJ([mktime]).
4107
7c1a6b73f48e An autoconf macro for its associated module.
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parents:
diff changeset
229 if test $ac_cv_func_working_mktime = no; then
11742
531d4547f010 Fix compilation error when <ctime> is used and mktime is replaced.
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diff changeset
230 REPLACE_MKTIME=1
4107
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Bruno Haible <bruno@clisp.org>
parents:
diff changeset
231 gl_PREREQ_MKTIME
11744
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
232 else
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
233 REPLACE_MKTIME=0
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
234 fi
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
235 ])
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
236
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
237 # Prerequisites of lib/mktime.c.
8427
8bd2ba354a25 mktime.c requires 'inline'.
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diff changeset
238 AC_DEFUN([gl_PREREQ_MKTIME],
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
239 [
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
240 AC_REQUIRE([AC_C_INLINE])
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
241 ])