vary.c revision 69457
131921Sbrian/*- 231921Sbrian * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org> 331921Sbrian * All rights reserved. 431921Sbrian * 531921Sbrian * Redistribution and use in source and binary forms, with or without 631921Sbrian * modification, are permitted provided that the following conditions 731921Sbrian * are met: 831921Sbrian * 1. Redistributions of source code must retain the above copyright 931921Sbrian * notice, this list of conditions and the following disclaimer. 1031921Sbrian * 2. Redistributions in binary form must reproduce the above copyright 1131921Sbrian * notice, this list of conditions and the following disclaimer in the 1231921Sbrian * documentation and/or other materials provided with the distribution. 1331921Sbrian * 1431921Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1531921Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1631921Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1731921Sbrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1831921Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1931921Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2031921Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2131921Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2231921Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2331921Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2431921Sbrian * SUCH DAMAGE. 2531921Sbrian */ 2631921Sbrian 2735773Scharnier#ifndef lint 2835773Scharnierstatic const char rcsid[] = 2950471Speter "$FreeBSD: head/bin/date/vary.c 69457 2000-12-01 09:59:40Z brian $"; 3035773Scharnier#endif /* not lint */ 3135773Scharnier 3269457Sbrian#include <err.h> 3327874Sbrian#include <time.h> 3427874Sbrian#include <string.h> 3527874Sbrian#include <stdlib.h> 3627874Sbrian#include "vary.h" 3727874Sbrian 3827874Sbrianstruct trans { 3927874Sbrian int val; 4027874Sbrian char *str; 4127874Sbrian}; 4227874Sbrian 4327874Sbrianstatic struct trans trans_mon[] = { 4427874Sbrian { 1, "january" }, { 2, "february" }, { 3, "march" }, { 4, "april" }, 4557326Salfred { 5, "may"}, { 6, "june" }, { 7, "july" }, { 8, "august" }, 4657326Salfred { 9, "september" }, { 10, "october" }, { 11, "november" }, { 12, "december" }, 4727874Sbrian { -1, NULL } 4827874Sbrian}; 4927874Sbrian 5027874Sbrianstatic struct trans trans_wday[] = { 5127874Sbrian { 0, "sunday" }, { 1, "monday" }, { 2, "tuesday" }, { 3, "wednesday" }, 5227874Sbrian { 4, "thursday" }, { 5, "friday" }, { 6, "saturday" }, 5327874Sbrian { -1, NULL } 5427874Sbrian}; 5527874Sbrian 5627874Sbrianstatic char digits[] = "0123456789"; 5759175Sbrianstatic int adjhour(struct tm *, char, int, int); 5827874Sbrian 5927874Sbrianstatic int 6059022Sbriandomktime(struct tm *t, char type) 6159022Sbrian{ 6259175Sbrian time_t ret; 6359022Sbrian 6459175Sbrian while ((ret = mktime(t)) == -1 && t->tm_year > 68 && t->tm_year < 138) 6559175Sbrian /* While mktime() fails, adjust by an hour */ 6659175Sbrian adjhour(t, type == '-' ? type : '+', 1, 0); 6759022Sbrian 6859022Sbrian return ret; 6959022Sbrian} 7059022Sbrian 7159022Sbrianstatic int 7227874Sbriantrans(const struct trans t[], const char *arg) 7327874Sbrian{ 7427874Sbrian int f; 7527874Sbrian 7627874Sbrian for (f = 0; t[f].val != -1; f++) 7728025Sbrian if (!strncasecmp(t[f].str, arg, 3) || 7828025Sbrian !strncasecmp(t[f].str, arg, strlen(t[f].str))) 7927874Sbrian return t[f].val; 8027874Sbrian 8127874Sbrian return -1; 8227874Sbrian} 8327874Sbrian 8427874Sbrianstruct vary * 8528025Sbrianvary_append(struct vary *v, char *arg) 8627874Sbrian{ 8727874Sbrian struct vary *result, **nextp; 8827874Sbrian 8927874Sbrian if (v) { 9027874Sbrian result = v; 9127874Sbrian while (v->next) 9227874Sbrian v = v->next; 9327874Sbrian nextp = &v->next; 9427874Sbrian } else 9527874Sbrian nextp = &result; 9627874Sbrian 9769457Sbrian if ((*nextp = (struct vary *)malloc(sizeof(struct vary))) == NULL) 9869457Sbrian err(1, "malloc"); 9927874Sbrian (*nextp)->arg = arg; 10027874Sbrian (*nextp)->next = NULL; 10127874Sbrian return result; 10227874Sbrian} 10327874Sbrian 10427874Sbrianstatic int mdays[12] = { 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; 10527874Sbrian 10627874Sbrianstatic int 10727874Sbriandaysinmonth(const struct tm *t) 10827874Sbrian{ 10927874Sbrian int year; 11027874Sbrian 11127874Sbrian year = t->tm_year + 1900; 11227874Sbrian 11327874Sbrian if (t->tm_mon == 1) 11427874Sbrian if (!(year % 400)) 11527874Sbrian return 29; 11627874Sbrian else if (!(year % 100)) 11727874Sbrian return 28; 11827874Sbrian else if (!(year % 4)) 11927874Sbrian return 29; 12027874Sbrian else 12127874Sbrian return 28; 12227874Sbrian else if (t->tm_mon >= 0 && t->tm_mon < 12) 12327874Sbrian return mdays[t->tm_mon]; 12427874Sbrian 12527874Sbrian return 0; 12627874Sbrian} 12727874Sbrian 12827874Sbrian 12927874Sbrianstatic int 13059175Sbrianadjyear(struct tm *t, char type, int val, int mk) 13127874Sbrian{ 13227874Sbrian switch (type) { 13327874Sbrian case '+': 13427874Sbrian t->tm_year += val; 13527874Sbrian break; 13627874Sbrian case '-': 13727874Sbrian t->tm_year -= val; 13827874Sbrian break; 13927874Sbrian default: 14027874Sbrian t->tm_year = val; 14127874Sbrian if (t->tm_year < 69) 14227874Sbrian t->tm_year += 100; /* as per date.c */ 14327874Sbrian else if (t->tm_year > 1900) 14427874Sbrian t->tm_year -= 1900; /* struct tm holds years since 1900 */ 14527874Sbrian break; 14627874Sbrian } 14759175Sbrian return !mk || domktime(t, type) != -1; 14827874Sbrian} 14927874Sbrian 15027874Sbrianstatic int 15159175Sbrianadjmon(struct tm *t, char type, int val, int istext, int mk) 15227874Sbrian{ 15327874Sbrian if (val < 0) 15427874Sbrian return 0; 15527874Sbrian 15627874Sbrian switch (type) { 15727874Sbrian case '+': 15846073Simp if (istext) { 15927874Sbrian if (val <= t->tm_mon) 16027874Sbrian val += 11 - t->tm_mon; /* early next year */ 16127874Sbrian else 16227874Sbrian val -= t->tm_mon + 1; /* later this year */ 16346073Simp } 16459022Sbrian if (val) { 16559175Sbrian if (!adjyear(t, '+', (t->tm_mon + val) / 12, 0)) 16659022Sbrian return 0; 16759022Sbrian val %= 12; 16859022Sbrian t->tm_mon += val; 16959022Sbrian if (t->tm_mon > 11) 17059022Sbrian t->tm_mon -= 12; 17159022Sbrian } 17227874Sbrian break; 17327874Sbrian 17427874Sbrian case '-': 17546073Simp if (istext) { 17627874Sbrian if (val-1 > t->tm_mon) 17727874Sbrian val = 13 - val + t->tm_mon; /* later last year */ 17827874Sbrian else 17927874Sbrian val = t->tm_mon - val + 1; /* early this year */ 18046073Simp } 18159022Sbrian if (val) { 18259175Sbrian if (!adjyear(t, '-', val / 12, 0)) 18327874Sbrian return 0; 18459022Sbrian val %= 12; 18559022Sbrian if (val > t->tm_mon) { 18659175Sbrian if (!adjyear(t, '-', 1, 0)) 18759022Sbrian return 0; 18859022Sbrian val -= 12; 18959022Sbrian } 19059022Sbrian t->tm_mon -= val; 19127874Sbrian } 19227874Sbrian break; 19327874Sbrian 19427874Sbrian default: 19527874Sbrian if (val > 12 || val < 1) 19627874Sbrian return 0; 19727874Sbrian t->tm_mon = --val; 19827874Sbrian } 19927874Sbrian 20059175Sbrian return !mk || domktime(t, type) != -1; 20127874Sbrian} 20227874Sbrian 20327874Sbrianstatic int 20459175Sbrianadjday(struct tm *t, char type, int val, int mk) 20527874Sbrian{ 20627874Sbrian int mdays; 20759022Sbrian 20827874Sbrian switch (type) { 20927874Sbrian case '+': 21027874Sbrian while (val) { 21127874Sbrian mdays = daysinmonth(t); 21227874Sbrian if (val > mdays - t->tm_mday) { 21327874Sbrian val -= mdays - t->tm_mday + 1; 21427874Sbrian t->tm_mday = 1; 21559175Sbrian if (!adjmon(t, '+', 1, 0, 0)) 21627874Sbrian return 0; 21727874Sbrian } else { 21827874Sbrian t->tm_mday += val; 21927874Sbrian val = 0; 22027874Sbrian } 22127874Sbrian } 22227874Sbrian break; 22327874Sbrian case '-': 22427874Sbrian while (val) 22527874Sbrian if (val >= t->tm_mday) { 22627874Sbrian val -= t->tm_mday; 22727874Sbrian t->tm_mday = 1; 22859175Sbrian if (!adjmon(t, '-', 1, 0, 0)) 22927874Sbrian return 0; 23027874Sbrian t->tm_mday = daysinmonth(t); 23127874Sbrian } else { 23227874Sbrian t->tm_mday -= val; 23327874Sbrian val = 0; 23427874Sbrian } 23527874Sbrian break; 23627874Sbrian default: 23727874Sbrian if (val > 0 && val <= daysinmonth(t)) 23827874Sbrian t->tm_mday = val; 23927874Sbrian else 24027874Sbrian return 0; 24127874Sbrian break; 24227874Sbrian } 24327874Sbrian 24459175Sbrian return !mk || domktime(t, type) != -1; 24527874Sbrian} 24627874Sbrian 24727874Sbrianstatic int 24859175Sbrianadjwday(struct tm *t, char type, int val, int istext, int mk) 24927874Sbrian{ 25027874Sbrian if (val < 0) 25127874Sbrian return 0; 25227874Sbrian 25328025Sbrian switch (type) { 25427874Sbrian case '+': 25527874Sbrian if (istext) 25627874Sbrian if (val < t->tm_wday) 25727874Sbrian val = 7 - t->tm_wday + val; /* early next week */ 25827874Sbrian else 25927874Sbrian val -= t->tm_wday; /* later this week */ 26027874Sbrian else 26159022Sbrian val *= 7; /* "-v+5w" == "5 weeks in the future" */ 26260836Sbrian return !val || adjday(t, '+', val, mk); 26327874Sbrian case '-': 26459022Sbrian if (istext) { 26527874Sbrian if (val > t->tm_wday) 26627874Sbrian val = 7 - val + t->tm_wday; /* later last week */ 26727874Sbrian else 26827874Sbrian val = t->tm_wday - val; /* early this week */ 26959022Sbrian } else 27059022Sbrian val *= 7; /* "-v-5w" == "5 weeks ago" */ 27160836Sbrian return !val || adjday(t, '-', val, mk); 27227874Sbrian default: 27327874Sbrian if (val < t->tm_wday) 27460836Sbrian return adjday(t, '-', t->tm_wday - val, mk); 27527874Sbrian else if (val > 6) 27627874Sbrian return 0; 27727874Sbrian else if (val > t->tm_wday) 27860836Sbrian return adjday(t, '+', val - t->tm_wday, mk); 27927874Sbrian } 28027874Sbrian return 1; 28127874Sbrian} 28227874Sbrian 28327874Sbrianstatic int 28459175Sbrianadjhour(struct tm *t, char type, int val, int mk) 28527874Sbrian{ 28628025Sbrian if (val < 0) 28728025Sbrian return 0; 28828025Sbrian 28928025Sbrian switch (type) { 29027874Sbrian case '+': 29159022Sbrian if (val) { 29259022Sbrian int days; 29359022Sbrian 29459022Sbrian days = (t->tm_hour + val) / 24; 29559022Sbrian val %= 24; 29659022Sbrian t->tm_hour += val; 29759022Sbrian t->tm_hour %= 24; 29859175Sbrian if (!adjday(t, '+', days, 0)) 29959022Sbrian return 0; 30059022Sbrian } 30128025Sbrian break; 30228025Sbrian 30327874Sbrian case '-': 30459022Sbrian if (val) { 30559022Sbrian int days; 30659022Sbrian 30759022Sbrian days = val / 24; 30859022Sbrian val %= 24; 30959022Sbrian if (val > t->tm_hour) { 31059022Sbrian days++; 31159022Sbrian val -= 24; 31259022Sbrian } 31359022Sbrian t->tm_hour -= val; 31459175Sbrian if (!adjday(t, '-', days, 0)) 31528025Sbrian return 0; 31628025Sbrian } 31728025Sbrian break; 31828025Sbrian 31927874Sbrian default: 32028025Sbrian if (val > 23) 32128025Sbrian return 0; 32228025Sbrian t->tm_hour = val; 32327874Sbrian } 32428025Sbrian 32559175Sbrian return !mk || domktime(t, type) != -1; 32627874Sbrian} 32727874Sbrian 32828025Sbrianstatic int 32959175Sbrianadjmin(struct tm *t, char type, int val, int mk) 33028025Sbrian{ 33128025Sbrian if (val < 0) 33228025Sbrian return 0; 33328025Sbrian 33428025Sbrian switch (type) { 33528025Sbrian case '+': 33659022Sbrian if (val) { 33759175Sbrian if (!adjhour(t, '+', (t->tm_min + val) / 60, 0)) 33859022Sbrian return 0; 33959022Sbrian val %= 60; 34059022Sbrian t->tm_min += val; 34159022Sbrian if (t->tm_min > 59) 34259022Sbrian t->tm_min -= 60; 34359022Sbrian } 34428025Sbrian break; 34528025Sbrian 34628025Sbrian case '-': 34759022Sbrian if (val) { 34859175Sbrian if (!adjhour(t, '-', val / 60, 0)) 34928025Sbrian return 0; 35059022Sbrian val %= 60; 35159022Sbrian if (val > t->tm_min) { 35259175Sbrian if (!adjhour(t, '-', 1, 0)) 35359022Sbrian return 0; 35459022Sbrian val -= 60; 35559022Sbrian } 35659022Sbrian t->tm_min -= val; 35728025Sbrian } 35828025Sbrian break; 35928025Sbrian 36028025Sbrian default: 36128025Sbrian if (val > 59) 36228025Sbrian return 0; 36328025Sbrian t->tm_min = val; 36428025Sbrian } 36528025Sbrian 36659175Sbrian return !mk || domktime(t, type) != -1; 36728025Sbrian} 36828025Sbrian 36944598Sbrianstatic int 37059175Sbrianadjsec(struct tm *t, char type, int val, int mk) 37144598Sbrian{ 37244598Sbrian if (val < 0) 37344598Sbrian return 0; 37444598Sbrian 37544598Sbrian switch (type) { 37644598Sbrian case '+': 37759022Sbrian if (val) { 37859175Sbrian if (!adjmin(t, '+', (t->tm_sec + val) / 60, 0)) 37959022Sbrian return 0; 38059022Sbrian val %= 60; 38159022Sbrian t->tm_sec += val; 38259022Sbrian if (t->tm_sec > 59) 38359022Sbrian t->tm_sec -= 60; 38459022Sbrian } 38544598Sbrian break; 38644598Sbrian 38744598Sbrian case '-': 38859022Sbrian if (val) { 38959175Sbrian if (!adjmin(t, '-', val / 60, 0)) 39044598Sbrian return 0; 39159022Sbrian val %= 60; 39259022Sbrian if (val > t->tm_sec) { 39359175Sbrian if (!adjmin(t, '-', 1, 0)) 39459022Sbrian return 0; 39559022Sbrian val -= 60; 39659022Sbrian } 39759022Sbrian t->tm_sec -= val; 39844598Sbrian } 39944598Sbrian break; 40044598Sbrian 40144598Sbrian default: 40244598Sbrian if (val > 59) 40344598Sbrian return 0; 40444598Sbrian t->tm_sec = val; 40544598Sbrian } 40644598Sbrian 40759175Sbrian return !mk || domktime(t, type) != -1; 40844598Sbrian} 40944598Sbrian 41027874Sbrianconst struct vary * 41127874Sbrianvary_apply(const struct vary *v, struct tm *t) 41227874Sbrian{ 41328025Sbrian char type; 41428025Sbrian char which; 41528025Sbrian char *arg; 41628025Sbrian int len; 41728025Sbrian int val; 41828025Sbrian 41927874Sbrian for (; v; v = v->next) { 42028025Sbrian type = *v->arg; 42128025Sbrian arg = v->arg; 42228025Sbrian if (type == '+' || type == '-') 42328025Sbrian arg++; 42428025Sbrian else 42528025Sbrian type = '\0'; 42628025Sbrian len = strlen(arg); 42728025Sbrian if (len < 2) 42828025Sbrian return v; 42928025Sbrian 43059175Sbrian if (type == '\0') 43159175Sbrian t->tm_isdst = -1; 43259175Sbrian 43328025Sbrian if (strspn(arg, digits) != len-1) { 43428025Sbrian val = trans(trans_wday, arg); 43528025Sbrian if (val != -1) { 43659175Sbrian if (!adjwday(t, type, val, 1, 1)) 43728025Sbrian return v; 43828025Sbrian } else { 43928025Sbrian val = trans(trans_mon, arg); 44028025Sbrian if (val != -1) { 44159175Sbrian if (!adjmon(t, type, val, 1, 1)) 44228025Sbrian return v; 44328025Sbrian } else 44427874Sbrian return v; 44528025Sbrian } 44628025Sbrian } else { 44728025Sbrian val = atoi(arg); 44828025Sbrian which = arg[len-1]; 44928025Sbrian 45028025Sbrian switch (which) { 45144598Sbrian case 'S': 45259175Sbrian if (!adjsec(t, type, val, 1)) 45344598Sbrian return v; 45444598Sbrian break; 45528025Sbrian case 'M': 45659175Sbrian if (!adjmin(t, type, val, 1)) 45728025Sbrian return v; 45828025Sbrian break; 45928025Sbrian case 'H': 46059175Sbrian if (!adjhour(t, type, val, 1)) 46128025Sbrian return v; 46228025Sbrian break; 46328025Sbrian case 'd': 46459175Sbrian t->tm_isdst = -1; 46559175Sbrian if (!adjday(t, type, val, 1)) 46628025Sbrian return v; 46728025Sbrian break; 46828025Sbrian case 'w': 46959175Sbrian t->tm_isdst = -1; 47059175Sbrian if (!adjwday(t, type, val, 0, 1)) 47128025Sbrian return v; 47228025Sbrian break; 47328025Sbrian case 'm': 47459175Sbrian t->tm_isdst = -1; 47559175Sbrian if (!adjmon(t, type, val, 0, 1)) 47628025Sbrian return v; 47728025Sbrian break; 47828025Sbrian case 'y': 47959175Sbrian t->tm_isdst = -1; 48059175Sbrian if (!adjyear(t, type, val, 1)) 48128025Sbrian return v; 48228025Sbrian break; 48328025Sbrian default: 48427874Sbrian return v; 48528025Sbrian } 48627874Sbrian } 48727874Sbrian } 48827874Sbrian return 0; 48927874Sbrian} 49027874Sbrian 49127874Sbrianvoid 49227874Sbrianvary_destroy(struct vary *v) 49327874Sbrian{ 49427874Sbrian struct vary *n; 49527874Sbrian 49627874Sbrian while (v) { 49727874Sbrian n = v->next; 49827874Sbrian free(v); 49927874Sbrian v = n; 50027874Sbrian } 50127874Sbrian} 502