1262445Serwin/* 2262445Serwin * Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC") 3262445Serwin * 4262445Serwin * Permission to use, copy, modify, and/or distribute this software for any 5262445Serwin * purpose with or without fee is hereby granted, provided that the above 6262445Serwin * copyright notice and this permission notice appear in all copies. 7262445Serwin * 8262445Serwin * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 9262445Serwin * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 10262445Serwin * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 11262445Serwin * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 12262445Serwin * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 13262445Serwin * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 14262445Serwin * PERFORMANCE OF THIS SOFTWARE. 15262445Serwin */ 16262445Serwin 17262445Serwin/*- 18262445Serwin * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 19262445Serwin * All rights reserved. 20262445Serwin * 21262445Serwin * This code was contributed to The NetBSD Foundation by Klaus Klein. 22262445Serwin * 23262445Serwin * Redistribution and use in source and binary forms, with or without 24262445Serwin * modification, are permitted provided that the following conditions 25262445Serwin * are met: 26262445Serwin * 1. Redistributions of source code must retain the above copyright 27262445Serwin * notice, this list of conditions and the following disclaimer. 28262445Serwin * 2. Redistributions in binary form must reproduce the above copyright 29262445Serwin * notice, this list of conditions and the following disclaimer in the 30262445Serwin * documentation and/or other materials provided with the distribution. 31262445Serwin * 32262445Serwin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 33262445Serwin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 34262445Serwin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 35262445Serwin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 36262445Serwin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 37262445Serwin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 38262445Serwin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 39262445Serwin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 40262445Serwin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 41262445Serwin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42262445Serwin * POSSIBILITY OF SUCH DAMAGE. 43262445Serwin */ 44262445Serwin 45262445Serwin#include <config.h> 46262445Serwin 47262445Serwin#include <stdio.h> 48262445Serwin#include <stdlib.h> 49262445Serwin#include <string.h> 50262445Serwin#include <time.h> 51262445Serwin#include <ctype.h> 52262445Serwin 53262445Serwin#include <isc/tm.h> 54262445Serwin#include <isc/util.h> 55262445Serwin 56262445Serwin/* 57262445Serwin * Portable conversion routines for struct tm, replacing 58262445Serwin * timegm() and strptime(), which are not available on all 59262445Serwin * platforms and don't always behave the same way when they 60262445Serwin * are. 61262445Serwin */ 62262445Serwin 63262445Serwin/* 64262445Serwin * We do not implement alternate representations. However, we always 65262445Serwin * check whether a given modifier is allowed for a certain conversion. 66262445Serwin */ 67262445Serwin#define ALT_E 0x01 68262445Serwin#define ALT_O 0x02 69262445Serwin#define LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } 70262445Serwin 71262445Serwin#ifndef TM_YEAR_BASE 72262445Serwin#define TM_YEAR_BASE 1900 73262445Serwin#endif 74262445Serwin 75262445Serwinstatic const char *day[7] = { 76262445Serwin "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", 77262445Serwin "Friday", "Saturday" 78262445Serwin}; 79262445Serwinstatic const char *abday[7] = { 80262445Serwin "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 81262445Serwin}; 82262445Serwinstatic const char *mon[12] = { 83262445Serwin "January", "February", "March", "April", "May", "June", "July", 84262445Serwin "August", "September", "October", "November", "December" 85262445Serwin}; 86262445Serwinstatic const char *abmon[12] = { 87262445Serwin "Jan", "Feb", "Mar", "Apr", "May", "Jun", 88262445Serwin "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 89262445Serwin}; 90262445Serwinstatic const char *am_pm[2] = { 91262445Serwin "AM", "PM" 92262445Serwin}; 93262445Serwin 94262445Serwinstatic int 95262445Serwinconv_num(const char **buf, int *dest, int llim, int ulim) { 96262445Serwin int result = 0; 97262445Serwin 98262445Serwin /* The limit also determines the number of valid digits. */ 99262445Serwin int rulim = ulim; 100262445Serwin 101262445Serwin if (**buf < '0' || **buf > '9') 102262445Serwin return (0); 103262445Serwin 104262445Serwin do { 105262445Serwin result *= 10; 106262445Serwin result += *(*buf)++ - '0'; 107262445Serwin rulim /= 10; 108262445Serwin } while ((result * 10 <= ulim) && 109262445Serwin rulim && **buf >= '0' && **buf <= '9'); 110262445Serwin 111262445Serwin if (result < llim || result > ulim) 112262445Serwin return (0); 113262445Serwin 114262445Serwin *dest = result; 115262445Serwin return (1); 116262445Serwin} 117262445Serwin 118262445Serwintime_t 119262445Serwinisc_tm_timegm(struct tm *tm) { 120262445Serwin time_t ret; 121262445Serwin int i, yday = 0, leapday; 122262445Serwin int mdays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30 }; 123262445Serwin 124262445Serwin leapday = ((((tm->tm_year + 1900 ) % 4) == 0 && 125262445Serwin ((tm->tm_year + 1900 ) % 100) != 0) || 126262445Serwin ((tm->tm_year + 1900 ) % 400) == 0) ? 1 : 0; 127262445Serwin mdays[1] += leapday; 128262445Serwin 129262445Serwin yday = tm->tm_mday - 1; 130262445Serwin for (i = 1; i <= tm->tm_mon; i++) 131262445Serwin yday += mdays[i - 1]; 132262445Serwin ret = tm->tm_sec + 133262445Serwin (60 * tm->tm_min) + 134262445Serwin (3600 * tm->tm_hour) + 135262445Serwin (86400 * (yday + 136262445Serwin ((tm->tm_year - 70) * 365) + 137262445Serwin ((tm->tm_year - 69) / 4) - 138262445Serwin ((tm->tm_year - 1) / 100) + 139262445Serwin ((tm->tm_year + 299) / 400))); 140262445Serwin return (ret); 141262445Serwin} 142262445Serwin 143262445Serwinchar * 144262445Serwinisc_tm_strptime(const char *buf, const char *fmt, struct tm *tm) { 145262445Serwin char c, *ret; 146262445Serwin const char *bp; 147262445Serwin size_t len = 0; 148262445Serwin int alt_format, i, split_year = 0; 149262445Serwin 150262445Serwin bp = buf; 151262445Serwin 152262445Serwin while ((c = *fmt) != '\0') { 153262445Serwin /* Clear `alternate' modifier prior to new conversion. */ 154262445Serwin alt_format = 0; 155262445Serwin 156262445Serwin /* Eat up white-space. */ 157262445Serwin if (isspace((unsigned char) c)) { 158262445Serwin while (isspace((unsigned char) *bp)) 159262445Serwin bp++; 160262445Serwin 161262445Serwin fmt++; 162262445Serwin continue; 163262445Serwin } 164262445Serwin 165262445Serwin if ((c = *fmt++) != '%') 166262445Serwin goto literal; 167262445Serwin 168262445Serwin 169262445Serwinagain: switch (c = *fmt++) { 170262445Serwin case '%': /* "%%" is converted to "%". */ 171262445Serwinliteral: 172262445Serwin if (c != *bp++) 173262445Serwin return (0); 174262445Serwin break; 175262445Serwin 176262445Serwin /* 177262445Serwin * "Alternative" modifiers. Just set the appropriate flag 178262445Serwin * and start over again. 179262445Serwin */ 180262445Serwin case 'E': /* "%E?" alternative conversion modifier. */ 181262445Serwin LEGAL_ALT(0); 182262445Serwin alt_format |= ALT_E; 183262445Serwin goto again; 184262445Serwin 185262445Serwin case 'O': /* "%O?" alternative conversion modifier. */ 186262445Serwin LEGAL_ALT(0); 187262445Serwin alt_format |= ALT_O; 188262445Serwin goto again; 189262445Serwin 190262445Serwin /* 191262445Serwin * "Complex" conversion rules, implemented through recursion. 192262445Serwin */ 193262445Serwin case 'c': /* Date and time, using the locale's format. */ 194262445Serwin LEGAL_ALT(ALT_E); 195262445Serwin if (!(bp = isc_tm_strptime(bp, "%x %X", tm))) 196262445Serwin return (0); 197262445Serwin break; 198262445Serwin 199262445Serwin case 'D': /* The date as "%m/%d/%y". */ 200262445Serwin LEGAL_ALT(0); 201262445Serwin if (!(bp = isc_tm_strptime(bp, "%m/%d/%y", tm))) 202262445Serwin return (0); 203262445Serwin break; 204262445Serwin 205262445Serwin case 'R': /* The time as "%H:%M". */ 206262445Serwin LEGAL_ALT(0); 207262445Serwin if (!(bp = isc_tm_strptime(bp, "%H:%M", tm))) 208262445Serwin return (0); 209262445Serwin break; 210262445Serwin 211262445Serwin case 'r': /* The time in 12-hour clock representation. */ 212262445Serwin LEGAL_ALT(0); 213262445Serwin if (!(bp = isc_tm_strptime(bp, "%I:%M:%S %p", tm))) 214262445Serwin return (0); 215262445Serwin break; 216262445Serwin 217262445Serwin case 'T': /* The time as "%H:%M:%S". */ 218262445Serwin LEGAL_ALT(0); 219262445Serwin if (!(bp = isc_tm_strptime(bp, "%H:%M:%S", tm))) 220262445Serwin return (0); 221262445Serwin break; 222262445Serwin 223262445Serwin case 'X': /* The time, using the locale's format. */ 224262445Serwin LEGAL_ALT(ALT_E); 225262445Serwin if (!(bp = isc_tm_strptime(bp, "%H:%M:%S", tm))) 226262445Serwin return (0); 227262445Serwin break; 228262445Serwin 229262445Serwin case 'x': /* The date, using the locale's format. */ 230262445Serwin LEGAL_ALT(ALT_E); 231262445Serwin if (!(bp = isc_tm_strptime(bp, "%m/%d/%y", tm))) 232262445Serwin return (0); 233262445Serwin break; 234262445Serwin 235262445Serwin /* 236262445Serwin * "Elementary" conversion rules. 237262445Serwin */ 238262445Serwin case 'A': /* The day of week, using the locale's form. */ 239262445Serwin case 'a': 240262445Serwin LEGAL_ALT(0); 241262445Serwin for (i = 0; i < 7; i++) { 242262445Serwin /* Full name. */ 243262445Serwin len = strlen(day[i]); 244262445Serwin if (strncasecmp(day[i], bp, len) == 0) 245262445Serwin break; 246262445Serwin 247262445Serwin /* Abbreviated name. */ 248262445Serwin len = strlen(abday[i]); 249262445Serwin if (strncasecmp(abday[i], bp, len) == 0) 250262445Serwin break; 251262445Serwin } 252262445Serwin 253262445Serwin /* Nothing matched. */ 254262445Serwin if (i == 7) 255262445Serwin return (0); 256262445Serwin 257262445Serwin tm->tm_wday = i; 258262445Serwin bp += len; 259262445Serwin break; 260262445Serwin 261262445Serwin case 'B': /* The month, using the locale's form. */ 262262445Serwin case 'b': 263262445Serwin case 'h': 264262445Serwin LEGAL_ALT(0); 265262445Serwin for (i = 0; i < 12; i++) { 266262445Serwin /* Full name. */ 267262445Serwin len = strlen(mon[i]); 268262445Serwin if (strncasecmp(mon[i], bp, len) == 0) 269262445Serwin break; 270262445Serwin 271262445Serwin /* Abbreviated name. */ 272262445Serwin len = strlen(abmon[i]); 273262445Serwin if (strncasecmp(abmon[i], bp, len) == 0) 274262445Serwin break; 275262445Serwin } 276262445Serwin 277262445Serwin /* Nothing matched. */ 278262445Serwin if (i == 12) 279262445Serwin return (0); 280262445Serwin 281262445Serwin tm->tm_mon = i; 282262445Serwin bp += len; 283262445Serwin break; 284262445Serwin 285262445Serwin case 'C': /* The century number. */ 286262445Serwin LEGAL_ALT(ALT_E); 287262445Serwin if (!(conv_num(&bp, &i, 0, 99))) 288262445Serwin return (0); 289262445Serwin 290262445Serwin if (split_year) { 291262445Serwin tm->tm_year = (tm->tm_year % 100) + (i * 100); 292262445Serwin } else { 293262445Serwin tm->tm_year = i * 100; 294262445Serwin split_year = 1; 295262445Serwin } 296262445Serwin break; 297262445Serwin 298262445Serwin case 'd': /* The day of month. */ 299262445Serwin case 'e': 300262445Serwin LEGAL_ALT(ALT_O); 301262445Serwin if (!(conv_num(&bp, &tm->tm_mday, 1, 31))) 302262445Serwin return (0); 303262445Serwin break; 304262445Serwin 305262445Serwin case 'k': /* The hour (24-hour clock representation). */ 306262445Serwin LEGAL_ALT(0); 307262445Serwin /* FALLTHROUGH */ 308262445Serwin case 'H': 309262445Serwin LEGAL_ALT(ALT_O); 310262445Serwin if (!(conv_num(&bp, &tm->tm_hour, 0, 23))) 311262445Serwin return (0); 312262445Serwin break; 313262445Serwin 314262445Serwin case 'l': /* The hour (12-hour clock representation). */ 315262445Serwin LEGAL_ALT(0); 316262445Serwin /* FALLTHROUGH */ 317262445Serwin case 'I': 318262445Serwin LEGAL_ALT(ALT_O); 319262445Serwin if (!(conv_num(&bp, &tm->tm_hour, 1, 12))) 320262445Serwin return (0); 321262445Serwin if (tm->tm_hour == 12) 322262445Serwin tm->tm_hour = 0; 323262445Serwin break; 324262445Serwin 325262445Serwin case 'j': /* The day of year. */ 326262445Serwin LEGAL_ALT(0); 327262445Serwin if (!(conv_num(&bp, &i, 1, 366))) 328262445Serwin return (0); 329262445Serwin tm->tm_yday = i - 1; 330262445Serwin break; 331262445Serwin 332262445Serwin case 'M': /* The minute. */ 333262445Serwin LEGAL_ALT(ALT_O); 334262445Serwin if (!(conv_num(&bp, &tm->tm_min, 0, 59))) 335262445Serwin return (0); 336262445Serwin break; 337262445Serwin 338262445Serwin case 'm': /* The month. */ 339262445Serwin LEGAL_ALT(ALT_O); 340262445Serwin if (!(conv_num(&bp, &i, 1, 12))) 341262445Serwin return (0); 342262445Serwin tm->tm_mon = i - 1; 343262445Serwin break; 344262445Serwin 345262445Serwin case 'p': /* The locale's equivalent of AM/PM. */ 346262445Serwin LEGAL_ALT(0); 347262445Serwin /* AM? */ 348262445Serwin if (strcasecmp(am_pm[0], bp) == 0) { 349262445Serwin if (tm->tm_hour > 11) 350262445Serwin return (0); 351262445Serwin 352262445Serwin bp += strlen(am_pm[0]); 353262445Serwin break; 354262445Serwin } 355262445Serwin /* PM? */ 356262445Serwin else if (strcasecmp(am_pm[1], bp) == 0) { 357262445Serwin if (tm->tm_hour > 11) 358262445Serwin return (0); 359262445Serwin 360262445Serwin tm->tm_hour += 12; 361262445Serwin bp += strlen(am_pm[1]); 362262445Serwin break; 363262445Serwin } 364262445Serwin 365262445Serwin /* Nothing matched. */ 366262445Serwin return (0); 367262445Serwin 368262445Serwin case 'S': /* The seconds. */ 369262445Serwin LEGAL_ALT(ALT_O); 370262445Serwin if (!(conv_num(&bp, &tm->tm_sec, 0, 61))) 371262445Serwin return (0); 372262445Serwin break; 373262445Serwin 374262445Serwin case 'U': /* The week of year, beginning on sunday. */ 375262445Serwin case 'W': /* The week of year, beginning on monday. */ 376262445Serwin LEGAL_ALT(ALT_O); 377262445Serwin /* 378262445Serwin * XXX This is bogus, as we can not assume any valid 379262445Serwin * information present in the tm structure at this 380262445Serwin * point to calculate a real value, so just check the 381262445Serwin * range for now. 382262445Serwin */ 383262445Serwin if (!(conv_num(&bp, &i, 0, 53))) 384262445Serwin return (0); 385262445Serwin break; 386262445Serwin 387262445Serwin case 'w': /* The day of week, beginning on sunday. */ 388262445Serwin LEGAL_ALT(ALT_O); 389262445Serwin if (!(conv_num(&bp, &tm->tm_wday, 0, 6))) 390262445Serwin return (0); 391262445Serwin break; 392262445Serwin 393262445Serwin case 'Y': /* The year. */ 394262445Serwin LEGAL_ALT(ALT_E); 395262445Serwin if (!(conv_num(&bp, &i, 0, 9999))) 396262445Serwin return (0); 397262445Serwin 398262445Serwin tm->tm_year = i - TM_YEAR_BASE; 399262445Serwin break; 400262445Serwin 401262445Serwin case 'y': /* The year within 100 years of the epoch. */ 402262445Serwin LEGAL_ALT(ALT_E | ALT_O); 403262445Serwin if (!(conv_num(&bp, &i, 0, 99))) 404262445Serwin return (0); 405262445Serwin 406262445Serwin if (split_year) { 407262445Serwin tm->tm_year = ((tm->tm_year / 100) * 100) + i; 408262445Serwin break; 409262445Serwin } 410262445Serwin split_year = 1; 411262445Serwin if (i <= 68) 412262445Serwin tm->tm_year = i + 2000 - TM_YEAR_BASE; 413262445Serwin else 414262445Serwin tm->tm_year = i + 1900 - TM_YEAR_BASE; 415262445Serwin break; 416262445Serwin 417262445Serwin /* 418262445Serwin * Miscellaneous conversions. 419262445Serwin */ 420262445Serwin case 'n': /* Any kind of white-space. */ 421262445Serwin case 't': 422262445Serwin LEGAL_ALT(0); 423262445Serwin while (isspace((unsigned char) *bp)) 424262445Serwin bp++; 425262445Serwin break; 426262445Serwin 427262445Serwin 428262445Serwin default: /* Unknown/unsupported conversion. */ 429262445Serwin return (0); 430262445Serwin } 431262445Serwin 432262445Serwin 433262445Serwin } 434262445Serwin 435262445Serwin /* LINTED functional specification */ 436262445Serwin DE_CONST(bp, ret); 437262445Serwin return (ret); 438262445Serwin} 439