From 8c6b2e7e9d30bb3a9ef4fd8632cbf6d8d0673bb7 Mon Sep 17 00:00:00 2001 From: Blake Jones Date: Wed, 21 Aug 2013 13:09:54 +0200 Subject: timegm: add portable implementation (Solaris support) The timegm(3) function is a non-standard extension to libc which is available in GNU libc and on some BSDs. Although SunOS had this function in its libc, Solaris (unfortunately) removed it. This patch implements a very simple version of timegm() which is good enough for parse-time-string.c. Signed-off-by: Vladimir Marek --- compat/timegm.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 compat/timegm.c (limited to 'compat/timegm.c') diff --git a/compat/timegm.c b/compat/timegm.c new file mode 100644 index 00000000..3560c370 --- /dev/null +++ b/compat/timegm.c @@ -0,0 +1,56 @@ +/* timegm.c --- Implementation of replacement timegm function. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 3, or (at + your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301, USA. */ + +/* Copyright 2013 Blake Jones. */ + +#include +#include "compat.h" + +static int +leapyear (int year) +{ + return ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)); +} + +/* + * This is a simple implementation of timegm() which does what is needed + * by create_output() -- just turns the "struct tm" into a GMT time_t. + * It does not normalize any of the fields of the "struct tm", nor does + * it set tm_wday or tm_yday. + */ +time_t +timegm (struct tm *tm) +{ + int monthlen[2][12] = { + { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, + { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, + }; + int year, month, days; + + days = 365 * (tm->tm_year - 70); + for (year = 70; year < tm->tm_year; year++) { + if (leapyear(1900 + year)) { + days++; + } + } + for (month = 0; month < tm->tm_mon; month++) { + days += monthlen[leapyear(1900 + year)][month]; + } + days += tm->tm_mday - 1; + + return ((((days * 24) + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec); +} -- cgit v1.2.3