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netsurf/utils/time.h

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/*
* Copyright 2014 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf 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; version 2 of the License.
*
* NetSurf 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, see <http://www.gnu.org/licenses/>.
*/
/**
* \file utils/time.h
* \brief Interface to time operations.
*/
#ifndef _NETSURF_UTILS_TIME_H_
#define _NETSURF_UTILS_TIME_H_
#include <time.h>
/**
* Write the time in seconds since epoch to a buffer.
*
* This is provided as strftime is not generally portable.
*
* @param str The destination buffer.
* @param size The length of the destination buffer.
* @param timep The pointer to the time to write.
* @return The length of the string written.
*/
int nsc_sntimet(char *str, size_t size, time_t *timep);
/**
* Parse time in seconds since epoc.
*
* This is provided as strptime is not generally portable.
*
* @param str The source buffer.
* @param size The length of the source buffer.
* @param timep Pointer to result.
* @return NSERROR_OK on success or error code on faliure.
*/
nserror nsc_snptimet(const char *str, size_t size, time_t *timep);
/**
* Converts a date string to a number of seconds since epoch
*
* returns the number of seconds since the Epoch, January 1st 1970
* 00:00:00 in the UTC time zone, for the date and time that the
* \a str parameter specifies.
*
* datetime strings passed must be in one of the formats specified in:
* - RFC 822 (updated in RFC 1123) using time zone name or time zone delta
* - RFC 850 (obsoleted by RFC 1036)
* - ANSI C's asctime() format.
*
* @param[in] str The datetime string to parse
* @param[in] size The length of the source string
* @param[out] timep Pointer to result on success unmodified on error.
* @return NSERROR_OK on success and timep updated else
* NSERROR_INVALID if the string parsing failed otherwise a suitable
* error code
*/
nserror nsc_strntimet(const char *str, size_t size, time_t *timep);
/**
* Create an RFC 1123 compliant date string from a Unix timestamp
*
* \param t The timestamp to consider
* \return Pointer to buffer containing string - invalidated by next call.
*/
const char *rfc1123_date(time_t t);
#endif