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Avoiding the use of setenv() and unsetenv() which are not available

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on Solaris 9.
This commit is contained in:
Thomas Schmitt 2011-01-18 15:26:19 +01:00
parent d6e150a10e
commit 4e60feaeab
2 changed files with 126 additions and 6 deletions
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2
libisofs/libisofs.h
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2007-2008 Vreixo Formoso, Mario Danic
* Copyright (c) 2009-2010 Thomas Schmitt
* Copyright (c) 2009-2011 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2

130
libisofs/util.c
View File

@ -1,7 +1,7 @@
/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2007 Mario Danic
* Copyright (c) 2009 Thomas Schmitt
* Copyright (c) 2009 - 2011 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
@ -1297,13 +1297,45 @@ void iso_datetime_17(unsigned char *buf, time_t t, int always_gmt)
}
/* >>> ts B10118: re-enable ifdef after testing period is over */
/*
#ifndef HAVE_TIMEGM
*/
/* putenv is SVr4, POSIX.1-2001, 4.3BSD , setenv is 4.3BSD, POSIX.1-2001.
So putenv is more widely available.
Also, setenv spoils eventual putenv expectation of applications because
putenv installs the original string which then may be altered from
its owner. setenv installs a copy that may not be altered.
Both are slow.
Thus first try with a naive implementation that assumes no leap seconds.
If it fails a test with gmtime() then use the slow function with mktime().
*/
#define Libisofs_use_putenV yes
static
time_t timegm(struct tm *tm)
time_t env_timegm(struct tm *tm)
{
time_t ret;
char *tz;
#ifdef Libisofs_use_putenV
static char unset_name[] = {"TZ"};
tz = getenv("TZ");
putenv("TZ=");
tzset();
ret = mktime(tm);
if (tz != NULL) {
/* tz is a pointer to the value part in a string of form "TZ="value */
putenv(tz - 3);
} else
putenv(unset_name); /* not daring to submit constant */
tzset();
#else /* Libisofs_use_putenV */
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
@ -1313,9 +1345,94 @@ time_t timegm(struct tm *tm)
else
unsetenv("TZ");
tzset();
#endif /* ! Libisofs_use_putenV */
return ret;
}
#endif
static
int ts_is_leapyear(int tm_year) /* years since 1900 */
{
return ((tm_year % 4) == 0 && ((tm_year % 100) != 0 ||
(tm_year % 400) == 100));
}
/* Fast implementation without leap seconds.
Inspired by but not copied from code by Kungliga Tekniska Hgskolan
(Royal Institute of Technology, Stockholm, Sweden),
which was modified by Andrew Tridgell for Samba4.
I claim own copyright 2011 Thomas Schmitt <scdbackup@gmx.net>.
*/
static
time_t ts_timegm(struct tm *tm)
{
time_t ret;
static int month_length_normal[12] =
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static int month_length_leap[12] =
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int *month_length_pt;
int years, i;
ret = 0;
years = tm->tm_year - 70; /* Years since 1970 */
if (years < 0)
return ret;
for (i = 0; i < years; i++) {
ret += 365 * 86400;
if (ts_is_leapyear(70 + i))
ret += 86400;
}
if (ts_is_leapyear(tm->tm_year))
month_length_pt = month_length_leap;
else
month_length_pt = month_length_normal;
for (i = 0; i < tm->tm_mon; i++)
ret += month_length_pt[i] * 86400;
ret += (tm->tm_mday - 1) * 86400;
ret += tm->tm_hour * 3600;
ret += tm->tm_min * 60;
ret += tm->tm_sec;
return ret;
}
/* >>> ts B10118: remove "soft_" after testing period is over */
static
time_t soft_timegm(struct tm *tm)
{
time_t raw_t, ret;
struct tm *test_tm, input_tm_copy;
/* Beware of ill effects if tm is result of gmtime() or alike */
memcpy(&input_tm_copy, tm, sizeof(struct tm));
/* Try without leapseconds (which are rarely implemented, as it seems) */
raw_t = ts_timegm(tm);
if (raw_t == 0)
return raw_t;
/* Check whether this translates back to the input values */
test_tm = gmtime(&raw_t);
if (input_tm_copy.tm_sec == test_tm->tm_sec &&
input_tm_copy.tm_min == test_tm->tm_min &&
input_tm_copy.tm_hour == test_tm->tm_hour &&
input_tm_copy.tm_mday == test_tm->tm_mday &&
input_tm_copy.tm_mon == test_tm->tm_mon &&
input_tm_copy.tm_year == test_tm->tm_year) {
ret = raw_t;
} else {
/* Mismatch. Use slow method around mktime() */
ret = env_timegm(&input_tm_copy);
}
return ret;
}
/* >>> ts B10118: re-enable ifdef after testing period is over */
/* #endif *//* ! HAVE_TIMEGM */
time_t iso_datetime_read_7(const uint8_t *buf)
{
@ -1327,7 +1444,9 @@ time_t iso_datetime_read_7(const uint8_t *buf)
tm.tm_hour = buf[3];
tm.tm_min = buf[4];
tm.tm_sec = buf[5];
return timegm(&tm) - ((int8_t)buf[6]) * 60 * 15;
/* >>> ts B10118: remove "soft_" after testing period is over */
return soft_timegm(&tm) - ((int8_t)buf[6]) * 60 * 15;
}
time_t iso_datetime_read_17(const uint8_t *buf)
@ -1343,7 +1462,8 @@ time_t iso_datetime_read_17(const uint8_t *buf)
tm.tm_year -= 1900;
tm.tm_mon -= 1;
return timegm(&tm) - ((int8_t)buf[6]) * 60 * 15;
/* >>> ts B10118: remove "soft_" after testing period is over */
return soft_timegm(&tm) - ((int8_t)buf[6]) * 60 * 15;
}
/**