-/* date.c - Date-parsing utility for the notmuch mail system.
- *
- * Copyright © 2000-2009 Jeffrey Stedfast
- *
- * 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 of the License, 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, see http://www.gnu.org/licenses/
- */
-
-/* This code was originally written by from Jeffrey Stedfast
- * as part of his GMime library (http://spruce.sourceforge.net/gmime/)
- *
- * Carl Worth <cworth@cworth.org> imported it into notmuch and removed
- * some glib-isms.
- */
-
-#include "notmuch-private.h"
-
-#include <time.h>
-
-#include <glib.h> /* For g_ascii_strncasecmp only. */
-
-#ifndef FALSE
-#define FALSE 0
-#endif
-
-#ifndef TRUE
-#define TRUE 1
-#endif
-
-#define d(x)
-
-#define GMIME_FOLD_PREENCODED (GMIME_FOLD_LEN / 2)
-
-/* date parser macros */
-#define NUMERIC_CHARS "1234567890"
-#define WEEKDAY_CHARS "SundayMondayTuesdayWednesdayThursdayFridaySaturday"
-#define MONTH_CHARS "JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember"
-#define TIMEZONE_ALPHA_CHARS "UTCGMTESTEDTCSTCDTMSTPSTPDTZAMNY()"
-#define TIMEZONE_NUMERIC_CHARS "-+1234567890"
-#define TIME_CHARS "1234567890:"
-
-#define DATE_TOKEN_NON_NUMERIC (1 << 0)
-#define DATE_TOKEN_NON_WEEKDAY (1 << 1)
-#define DATE_TOKEN_NON_MONTH (1 << 2)
-#define DATE_TOKEN_NON_TIME (1 << 3)
-#define DATE_TOKEN_HAS_COLON (1 << 4)
-#define DATE_TOKEN_NON_TIMEZONE_ALPHA (1 << 5)
-#define DATE_TOKEN_NON_TIMEZONE_NUMERIC (1 << 6)
-#define DATE_TOKEN_HAS_SIGN (1 << 7)
-
-static unsigned char gmime_datetok_table[256] = {
- 128,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111, 79, 79,111,175,111,175,111,111,
- 38, 38, 38, 38, 38, 38, 38, 38, 38, 38,119,111,111,111,111,111,
- 111, 75,111, 79, 75, 79,105, 79,111,111,107,111,111, 73, 75,107,
- 79,111,111, 73, 77, 79,111,109,111, 79, 79,111,111,111,111,111,
- 111,105,107,107,109,105,111,107,105,105,111,111,107,107,105,105,
- 107,111,105,105,105,105,107,111,111,105,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
- 111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,111,
-};
-
-/* hrm, is there a library for this stuff? */
-static struct {
- const char *name;
- int offset;
-} tz_offsets [] = {
- { "UT", 0 },
- { "GMT", 0 },
- { "EST", -500 }, /* these are all US timezones. bloody yanks */
- { "EDT", -400 },
- { "CST", -600 },
- { "CDT", -500 },
- { "MST", -700 },
- { "MDT", -600 },
- { "PST", -800 },
- { "PDT", -700 },
- { "Z", 0 },
- { "A", -100 },
- { "M", -1200 },
- { "N", 100 },
- { "Y", 1200 },
-};
-
-static const char *tm_months[] = {
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
-};
-
-static const char *tm_days[] = {
- "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
-};
-
-/* This is where it gets ugly... */
-
-typedef struct _date_token {
- struct _date_token *next;
- unsigned char mask;
- const char *start;
- size_t len;
-} date_token;
-
-#define date_token_free(tok) free (tok)
-#define date_token_new() malloc (sizeof (date_token))
-
-static date_token *
-datetok (const char *date)
-{
- date_token *tokens = NULL, *token, *tail = (date_token *) &tokens;
- const char *start, *end;
- unsigned char mask;
-
- start = date;
- while (*start) {
- /* kill leading whitespace */
- while (*start == ' ' || *start == '\t')
- start++;
-
- if (*start == '\0')
- break;
-
- mask = gmime_datetok_table[(unsigned char) *start];
-
- /* find the end of this token */
- end = start + 1;
- while (*end && !strchr ("-/,\t\r\n ", *end))
- mask |= gmime_datetok_table[(unsigned char) *end++];
-
- if (end != start) {
- token = date_token_new ();
- token->next = NULL;
- token->start = start;
- token->len = end - start;
- token->mask = mask;
-
- tail->next = token;
- tail = token;
- }
-
- if (*end)
- start = end + 1;
- else
- break;
- }
-
- return tokens;
-}
-
-static int
-decode_int (const char *in, size_t inlen)
-{
- register const char *inptr;
- int sign = 1, val = 0;
- const char *inend;
-
- inptr = in;
- inend = in + inlen;
-
- if (*inptr == '-') {
- sign = -1;
- inptr++;
- } else if (*inptr == '+')
- inptr++;
-
- for ( ; inptr < inend; inptr++) {
- if (!(*inptr >= '0' && *inptr <= '9'))
- return -1;
- else
- val = (val * 10) + (*inptr - '0');
- }
-
- val *= sign;
-
- return val;
-}
-
-#if 0
-static int
-get_days_in_month (int month, int year)
-{
- switch (month) {
- case 1:
- case 3:
- case 5:
- case 7:
- case 8:
- case 10:
- case 12:
- return 31;
- case 4:
- case 6:
- case 9:
- case 11:
- return 30;
- case 2:
- if (g_date_is_leap_year (year))
- return 29;
- else
- return 28;
- default:
- return 0;
- }
-}
-#endif
-
-static int
-get_wday (const char *in, size_t inlen)
-{
- int wday;
-
- if (in == NULL)
- return -1;
-
- if (inlen < 3)
- return -1;
-
- for (wday = 0; wday < 7; wday++) {
- if (!g_ascii_strncasecmp (in, tm_days[wday], 3))
- return wday;
- }
-
- return -1; /* unknown week day */
-}
-
-static int
-get_mday (const char *in, size_t inlen)
-{
- int mday;
-
- if (in == NULL)
- return -1;
-
- mday = decode_int (in, inlen);
-
- if (mday < 0 || mday > 31)
- mday = -1;
-
- return mday;
-}
-
-static int
-get_month (const char *in, size_t inlen)
-{
- int i;
-
- if (in == NULL)
- return -1;
-
- if (inlen < 3)
- return -1;
-
- for (i = 0; i < 12; i++) {
- if (!g_ascii_strncasecmp (in, tm_months[i], 3))
- return i;
- }
-
- return -1; /* unknown month */
-}
-
-static int
-get_year (const char *in, size_t inlen)
-{
- int year;
-
- if (in == NULL)
- return -1;
-
- if ((year = decode_int (in, inlen)) == -1)
- return -1;
-
- if (year < 100)
- year += (year < 70) ? 2000 : 1900;
-
- if (year < 1969)
- return -1;
-
- return year;
-}
-
-static int
-get_time (const char *in, size_t inlen, int *hour, int *min, int *sec)
-{
- register const char *inptr;
- int *val, colons = 0;
- const char *inend;
-
- *hour = *min = *sec = 0;
-
- inend = in + inlen;
- val = hour;
- for (inptr = in; inptr < inend; inptr++) {
- if (*inptr == ':') {
- colons++;
- switch (colons) {
- case 1:
- val = min;
- break;
- case 2:
- val = sec;
- break;
- default:
- return FALSE;
- }
- } else if (!(*inptr >= '0' && *inptr <= '9'))
- return FALSE;
- else
- *val = (*val * 10) + (*inptr - '0');
- }
-
- return TRUE;
-}
-
-static int
-get_tzone (date_token **token)
-{
- const char *inptr, *inend;
- size_t inlen;
- int i, t;
-
- for (i = 0; *token && i < 2; *token = (*token)->next, i++) {
- inptr = (*token)->start;
- inlen = (*token)->len;
- inend = inptr + inlen;
-
- if (*inptr == '+' || *inptr == '-') {
- return decode_int (inptr, inlen);
- } else {
- if (*inptr == '(') {
- inptr++;
- if (*(inend - 1) == ')')
- inlen -= 2;
- else
- inlen--;
- }
-
- for (t = 0; t < 15; t++) {
- size_t len = strlen (tz_offsets[t].name);
-
- if (len != inlen)
- continue;
-
- if (!strncmp (inptr, tz_offsets[t].name, len))
- return tz_offsets[t].offset;
- }
- }
- }
-
- return -1;
-}
-
-#define HAVE_TIMEZONE
-
-static time_t
-mktime_utc (struct tm *tm)
-{
- time_t tt;
- long tz;
-
- tm->tm_isdst = -1;
- tt = mktime (tm);
-
-#if defined (G_OS_WIN32)
- _get_timezone (&tz);
- if (tm->tm_isdst > 0) {
- int dst;
-
- _get_dstbias (&dst);
- tz += dst;
- }
-#elif defined (HAVE_TM_GMTOFF)
- tz = -tm->tm_gmtoff;
-#elif defined (HAVE_TIMEZONE)
- if (tm->tm_isdst > 0) {
-#if defined (HAVE_ALTZONE)
- tz = altzone;
-#else /* !defined (HAVE_ALTZONE) */
- tz = (timezone - 3600);
-#endif
- } else {
- tz = timezone;
- }
-#elif defined (HAVE__TIMEZONE)
- tz = _timezone;
-#else
-#error Neither HAVE_TIMEZONE nor HAVE_TM_GMTOFF defined. Rerun autoheader, autoconf, etc.
-#endif
-
- return tt - tz;
-}
-
-static time_t
-parse_rfc822_date (date_token *tokens, int *tzone)
-{
- int hour, min, sec, offset, n;
- date_token *token;
- struct tm tm;
- time_t t;
-
- if (tokens == NULL)
- return 0;
-
- token = tokens;
-
- memset ((void *) &tm, 0, sizeof (struct tm));
-
- if ((n = get_wday (token->start, token->len)) != -1) {
- /* not all dates may have this... */
- tm.tm_wday = n;
- token = token->next;
- }
-
- /* get the mday */
- if (!token || (n = get_mday (token->start, token->len)) == -1)
- return (time_t) 0;
-
- tm.tm_mday = n;
- token = token->next;
-
- /* get the month */
- if (!token || (n = get_month (token->start, token->len)) == -1)
- return (time_t) 0;
-
- tm.tm_mon = n;
- token = token->next;
-
- /* get the year */
- if (!token || (n = get_year (token->start, token->len)) == -1)
- return (time_t) 0;
-
- tm.tm_year = n - 1900;
- token = token->next;
-
- /* get the hour/min/sec */
- if (!token || !get_time (token->start, token->len, &hour, &min, &sec))
- return (time_t) 0;
-
- tm.tm_hour = hour;
- tm.tm_min = min;
- tm.tm_sec = sec;
- token = token->next;
-
- /* get the timezone */
- if (!token || (n = get_tzone (&token)) == -1) {
- /* I guess we assume tz is GMT? */
- offset = 0;
- } else {
- offset = n;
- }
-
- t = mktime_utc (&tm);
-
- /* t is now GMT of the time we want, but not offset by the timezone ... */
-
- /* this should convert the time to the GMT equiv time */
- t -= ((offset / 100) * 60 * 60) + (offset % 100) * 60;
-
- if (tzone)
- *tzone = offset;
-
- return t;
-}
-
-
-#define date_token_mask(t) (((date_token *) t)->mask)
-#define is_numeric(t) ((date_token_mask (t) & DATE_TOKEN_NON_NUMERIC) == 0)
-#define is_weekday(t) ((date_token_mask (t) & DATE_TOKEN_NON_WEEKDAY) == 0)
-#define is_month(t) ((date_token_mask (t) & DATE_TOKEN_NON_MONTH) == 0)
-#define is_time(t) (((date_token_mask (t) & DATE_TOKEN_NON_TIME) == 0) && (date_token_mask (t) & DATE_TOKEN_HAS_COLON))
-#define is_tzone_alpha(t) ((date_token_mask (t) & DATE_TOKEN_NON_TIMEZONE_ALPHA) == 0)
-#define is_tzone_numeric(t) (((date_token_mask (t) & DATE_TOKEN_NON_TIMEZONE_NUMERIC) == 0) && (date_token_mask (t) & DATE_TOKEN_HAS_SIGN))
-#define is_tzone(t) (is_tzone_alpha (t) || is_tzone_numeric (t))
-
-static time_t
-parse_broken_date (date_token *tokens, int *tzone)
-{
- int got_wday, got_month, got_tzone;
- int hour, min, sec, offset, n;
- date_token *token;
- struct tm tm;
- time_t t;
-
- memset ((void *) &tm, 0, sizeof (struct tm));
- got_wday = got_month = got_tzone = FALSE;
- offset = 0;
-
- token = tokens;
- while (token) {
- if (is_weekday (token) && !got_wday) {
- if ((n = get_wday (token->start, token->len)) != -1) {
- d(printf ("weekday; "));
- got_wday = TRUE;
- tm.tm_wday = n;
- goto next;
- }
- }
-
- if (is_month (token) && !got_month) {
- if ((n = get_month (token->start, token->len)) != -1) {
- d(printf ("month; "));
- got_month = TRUE;
- tm.tm_mon = n;
- goto next;
- }
- }
-
- if (is_time (token) && !tm.tm_hour && !tm.tm_min && !tm.tm_sec) {
- if (get_time (token->start, token->len, &hour, &min, &sec)) {
- d(printf ("time; "));
- tm.tm_hour = hour;
- tm.tm_min = min;
- tm.tm_sec = sec;
- goto next;
- }
- }
-
- if (is_tzone (token) && !got_tzone) {
- date_token *t = token;
-
- if ((n = get_tzone (&t)) != -1) {
- d(printf ("tzone; "));
- got_tzone = TRUE;
- offset = n;
- goto next;
- }
- }
-
- if (is_numeric (token)) {
- if (token->len == 4 && !tm.tm_year) {
- if ((n = get_year (token->start, token->len)) != -1) {
- d(printf ("year; "));
- tm.tm_year = n - 1900;
- goto next;
- }
- } else {
- /* Note: assumes MM-DD-YY ordering if '0 < MM < 12' holds true */
- if (!got_month && token->next && is_numeric (token->next)) {
- if ((n = decode_int (token->start, token->len)) > 12) {
- goto mday;
- } else if (n > 0) {
- d(printf ("mon; "));
- got_month = TRUE;
- tm.tm_mon = n - 1;
- }
- goto next;
- } else if (!tm.tm_mday && (n = get_mday (token->start, token->len)) != -1) {
- mday:
- d(printf ("mday; "));
- tm.tm_mday = n;
- goto next;
- } else if (!tm.tm_year) {
- if ((n = get_year (token->start, token->len)) != -1) {
- d(printf ("2-digit year; "));
- tm.tm_year = n - 1900;
- }
- goto next;
- }
- }
- }
-
- d(printf ("???; "));
-
- next:
-
- token = token->next;
- }
-
- d(printf ("\n"));
-
- t = mktime_utc (&tm);
-
- /* t is now GMT of the time we want, but not offset by the timezone ... */
-
- /* this should convert the time to the GMT equiv time */
- t -= ((offset / 100) * 60 * 60) + (offset % 100) * 60;
-
- if (tzone)
- *tzone = offset;
-
- return t;
-}
-
-#if 0
-static void
-gmime_datetok_table_init (void)
-{
- int i;
-
- memset (gmime_datetok_table, 0, sizeof (gmime_datetok_table));
-
- for (i = 0; i < 256; i++) {
- if (!strchr (NUMERIC_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_NUMERIC;
-
- if (!strchr (WEEKDAY_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_WEEKDAY;
-
- if (!strchr (MONTH_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_MONTH;
-
- if (!strchr (TIME_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_TIME;
-
- if (!strchr (TIMEZONE_ALPHA_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_TIMEZONE_ALPHA;
-
- if (!strchr (TIMEZONE_NUMERIC_CHARS, i))
- gmime_datetok_table[i] |= DATE_TOKEN_NON_TIMEZONE_NUMERIC;
-
- if (((char) i) == ':')
- gmime_datetok_table[i] |= DATE_TOKEN_HAS_COLON;
-
- if (strchr ("+-", i))
- gmime_datetok_table[i] |= DATE_TOKEN_HAS_SIGN;
- }
-
- printf ("static unsigned char gmime_datetok_table[256] = {");
- for (i = 0; i < 256; i++) {
- if (i % 16 == 0)
- printf ("\n\t");
- printf ("%3d,", gmime_datetok_table[i]);
- }
- printf ("\n};\n");
-}
-#endif
-
-time_t
-notmuch_parse_date (const char *str, int *tz_offset)
-{
- date_token *token, *tokens;
- time_t date;
-
- if (str == NULL)
- return 0;
-
- if (!(tokens = datetok (str))) {
- if (tz_offset)
- *tz_offset = 0;
-
- return 0;
- }
-
- if (!(date = parse_rfc822_date (tokens, tz_offset)))
- date = parse_broken_date (tokens, tz_offset);
-
- /* cleanup */
- while (tokens) {
- token = tokens;
- tokens = tokens->next;
- date_token_free (token);
- }
-
- return date;
-}
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