271 lines
7.5 KiB
C
271 lines
7.5 KiB
C
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/* $NetBSD: getdate.c,v 1.2 2009/11/22 18:07:39 mbalmer Exp $ */
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/*
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Brian Ginsbach.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <util.h>
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#define TMSENTINEL (-1)
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/*
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* getdate_err is set to one of the following values on error.
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*
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* 1 The DATEMSK environment variable is null or undefined.
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* 2 The template file cannot be opened for reading.
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* 3 Failed to get file status information.
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* 4 Template file is not a regular file.
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* 5 Encountered an error while reading the template file.
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* 6 Cannot allocate memory.
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* 7 Input string does not match any line in the template.
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* 8 Input string is invalid (for example, February 31) or could not
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* be represented in a time_t.
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*/
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int getdate_err;
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struct tm *
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getdate(const char *str)
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{
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char *datemsk, *line, *rp;
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FILE *fp;
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struct stat sb;
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static struct tm rtm, tmnow;
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struct tm *tmp, *rtmp = &rtm;
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size_t lineno = 0;
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time_t now;
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if (((datemsk = getenv("DATEMSK")) == NULL) || *datemsk == '\0') {
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getdate_err = 1;
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return (NULL);
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}
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if (stat(datemsk, &sb) < 0) {
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getdate_err = 3;
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return (NULL);
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}
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if ((sb.st_mode & S_IFMT) != S_IFREG) {
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getdate_err = 4;
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return (NULL);
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}
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if ((fp = fopen(datemsk, "r")) == NULL) {
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getdate_err = 2;
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return (NULL);
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}
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/* loop through datemsk file */
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errno = 0;
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rp = NULL;
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while ((line = fparseln(fp, NULL, &lineno, NULL, 0)) != NULL) {
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/* initialize tmp with sentinels */
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rtm.tm_sec = rtm.tm_min = rtm.tm_hour = TMSENTINEL;
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rtm.tm_mday = rtm.tm_mon = rtm.tm_year = TMSENTINEL;
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rtm.tm_wday = rtm.tm_yday = rtm.tm_isdst = TMSENTINEL;
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rtm.tm_gmtoff = 0;
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rtm.tm_zone = NULL;
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rp = strptime(str, line, rtmp);
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free(line);
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if (rp != NULL)
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break;
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errno = 0;
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}
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if (errno != 0 || ferror(fp)) {
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if (errno == ENOMEM)
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getdate_err = 6;
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else
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getdate_err = 5;
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fclose(fp);
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return (NULL);
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}
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if (feof(fp) || (rp != NULL && *rp != '\0')) {
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getdate_err = 7;
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return (NULL);
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}
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fclose(fp);
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time(&now);
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tmp = localtime(&now);
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tmnow = *tmp;
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/*
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* This implementation does not accept setting the broken-down time
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* to anything other than the localtime(). It is not possible to
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* change the scanned timezone with %Z.
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*
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* Note IRIX and Solaris accept only the current zone for %Z.
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* XXX Is there any implementation that matches the standard?
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* XXX (Or am I reading the standard wrong?)
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*
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* Note: Neither XPG 6 (POSIX 2004) nor XPG 7 (POSIX 2008)
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* requires strptime(3) support for %Z.
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*/
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/*
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* Given only a weekday find the first matching weekday starting
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* with the current weekday and moving into the future.
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*/
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if (rtm.tm_wday != TMSENTINEL && rtm.tm_year == TMSENTINEL &&
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rtm.tm_mon == TMSENTINEL && rtm.tm_mday == TMSENTINEL) {
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rtm.tm_year = tmnow.tm_year;
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rtm.tm_mon = tmnow.tm_mon;
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rtm.tm_mday = tmnow.tm_mday +
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(rtm.tm_wday - tmnow.tm_wday + 7) % 7;
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}
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/*
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* Given only a month (and no year) find the first matching month
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* starting with the current month and moving into the future.
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*/
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if (rtm.tm_mon != TMSENTINEL) {
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if (rtm.tm_year == TMSENTINEL) {
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rtm.tm_year = tmnow.tm_year +
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((rtm.tm_mon < tmnow.tm_mon)? 1 : 0);
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}
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if (rtm.tm_mday == TMSENTINEL) {
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/* assume the first of the month */
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rtm.tm_mday = 1;
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/*
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* XXX This isn't documented! Just observed behavior.
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*
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* Given the weekday find the first matching weekday
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* starting with the weekday of the first day of the
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* the month and moving into the future.
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*/
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if (rtm.tm_wday != TMSENTINEL) {
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struct tm tm;
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memset(&tm, 0, sizeof(struct tm));
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tm.tm_year = rtm.tm_year;
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tm.tm_mon = rtm.tm_mon;
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tm.tm_mday = 1;
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mktime(&tm);
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rtm.tm_mday +=
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(rtm.tm_wday - tm.tm_wday + 7) % 7;
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}
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}
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}
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/*
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* Given no time of day assume the current time of day.
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*/
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if (rtm.tm_hour == TMSENTINEL &&
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rtm.tm_min == TMSENTINEL && rtm.tm_sec == TMSENTINEL) {
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rtm.tm_hour = tmnow.tm_hour;
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rtm.tm_min = tmnow.tm_min;
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rtm.tm_sec = tmnow.tm_sec;
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}
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/*
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* Given an hour and no date, find the first matching hour starting
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* with the current hour and moving into the future
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*/
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if (rtm.tm_hour != TMSENTINEL &&
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rtm.tm_year == TMSENTINEL && rtm.tm_mon == TMSENTINEL &&
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rtm.tm_mday == TMSENTINEL) {
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rtm.tm_year = tmnow.tm_year;
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rtm.tm_mon = tmnow.tm_mon;
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rtm.tm_mday = tmnow.tm_mday;
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if (rtm.tm_hour < tmnow.tm_hour)
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rtm.tm_hour += 24;
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}
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/*
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* Set to 'sane' values; mktime(3) does funny things otherwise.
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* No hours, no minutes, no seconds, no service.
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*/
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if (rtm.tm_hour == TMSENTINEL)
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rtm.tm_hour = 0;
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if (rtm.tm_min == TMSENTINEL)
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rtm.tm_min = 0;
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if (rtm.tm_sec == TMSENTINEL)
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rtm.tm_sec = 0;
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/*
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* Given only a year the values of month, day of month, day of year,
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* week day and is daylight (summer) time are unspecified.
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* (Specified on the Solaris man page not POSIX.)
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*/
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if (rtm.tm_year != TMSENTINEL &&
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rtm.tm_mon == TMSENTINEL && rtm.tm_mday == TMSENTINEL) {
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rtm.tm_mon = 0;
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rtm.tm_mday = 1;
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/*
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* XXX More undocumented functionality but observed.
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*
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* Given the weekday find the first matching weekday
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* starting with the weekday of the first day of the
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* month and moving into the future.
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*/
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if (rtm.tm_wday != TMSENTINEL) {
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struct tm tm;
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memset(&tm, 0, sizeof(struct tm));
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tm.tm_year = rtm.tm_year;
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tm.tm_mon = rtm.tm_mon;
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tm.tm_mday = 1;
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mktime(&tm);
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rtm.tm_mday += (rtm.tm_wday - tm.tm_wday + 7) % 7;
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}
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}
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/*
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* Given only the century but no year within, the current year
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* is assumed. (Specified on the Solaris man page not POSIX.)
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*
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* Warning ugly end case
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*
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* This is more work since strptime(3) doesn't "do the right thing".
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*/
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if (rtm.tm_year != TMSENTINEL && (rtm.tm_year - 1900) >= 0) {
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rtm.tm_year -= 1900;
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rtm.tm_year += (tmnow.tm_year % 100);
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}
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/*
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* mktime() will normalize all values and also check that the
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* value will fit into a time_t.
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*
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* This is only for POSIX correctness. A date >= 1900 is
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* really ok, but using a time_t limits things.
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*/
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if (mktime(rtmp) < 0) {
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getdate_err = 8;
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return (NULL);
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}
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return (rtmp);
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}
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