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Diffstat (limited to 'common/gettime.c')
| -rw-r--r-- | common/gettime.c | 1064 |
1 files changed, 1064 insertions, 0 deletions
diff --git a/common/gettime.c b/common/gettime.c new file mode 100644 index 0000000..3fe30ce --- /dev/null +++ b/common/gettime.c @@ -0,0 +1,1064 @@ +/* gettime.c - Wrapper for time functions + * Copyright (C) 1998, 2002, 2007, 2011 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of either + * + * - the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at + * your option) any later version. + * + * or + * + * - the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * or both in parallel, as here. + * + * This file 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 <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <stdlib.h> +#include <time.h> +#include <ctype.h> +#ifdef HAVE_LOCALE_H +#include <locale.h> +#endif +#ifdef HAVE_LANGINFO_H +#include <langinfo.h> +#endif + +#include "util.h" +#include "i18n.h" +#include "gettime.h" + +#ifdef HAVE_UNSIGNED_TIME_T +# define IS_INVALID_TIME_T(a) ((a) == (time_t)(-1)) +#else + /* Error or 32 bit time_t and value after 2038-01-19. */ +# define IS_INVALID_TIME_T(a) ((a) < 0) +#endif + + +static unsigned long timewarp; +static enum { NORMAL = 0, FROZEN, FUTURE, PAST } timemode; + +/* Correction used to map to real Julian days. */ +#define JD_DIFF 1721060L + + +/* Wrapper for the time(3). We use this here so we can fake the time + for tests */ +time_t +gnupg_get_time () +{ + time_t current = time (NULL); + if (current == (time_t)(-1)) + log_fatal ("time() failed\n"); + + if (timemode == NORMAL) + return current; + else if (timemode == FROZEN) + return timewarp; + else if (timemode == FUTURE) + return current + timewarp; + else + return current - timewarp; +} + + +/* Wrapper around gmtime_r. + + On systems without gmtime_r this implementation works within gnupg + because we use only one thread a time. FIXME: An independent + library may use gmtime in one of its own thread (or via + npth_enter/npth_leave) - in this case we run into a problem. The + solution would be to use a mutex here. */ +struct tm * +gnupg_gmtime (const time_t *timep, struct tm *result) +{ +#ifdef HAVE_GMTIME_R + return gmtime_r (timep, result); +#else + struct tm *tp; + + tp = gmtime (timep); + if (tp) + memcpy (result, tp, sizeof *result); + return tp; +#endif +} + + +/* Return the current time (possibly faked) in ISO format. */ +void +gnupg_get_isotime (gnupg_isotime_t timebuf) +{ + time_t atime = gnupg_get_time (); + struct tm *tp; + struct tm tmbuf; + + tp = gnupg_gmtime (&atime, &tmbuf); + if (!tp) + *timebuf = 0; + else + snprintf (timebuf, 16, "%04d%02d%02dT%02d%02d%02d", + 1900 + tp->tm_year, tp->tm_mon+1, tp->tm_mday, + tp->tm_hour, tp->tm_min, tp->tm_sec); +} + + +/* Set the time to NEWTIME so that gnupg_get_time returns a time + starting with this one. With FREEZE set to 1 the returned time + will never change. Just for completeness, a value of (time_t)-1 + for NEWTIME gets you back to reality. Note that this is obviously + not thread-safe but this is not required. */ +void +gnupg_set_time (time_t newtime, int freeze) +{ + time_t current = time (NULL); + + if ( newtime == (time_t)-1 || current == newtime) + { + timemode = NORMAL; + timewarp = 0; + } + else if (freeze) + { + timemode = FROZEN; + timewarp = newtime == (time_t)-1 ? current : newtime; + } + else if (newtime > current) + { + timemode = FUTURE; + timewarp = newtime - current; + } + else + { + timemode = PAST; + timewarp = current - newtime; + } +} + +/* Returns true when we are in timewarp mode */ +int +gnupg_faked_time_p (void) +{ + return timemode; +} + + +/* This function is used by gpg because OpenPGP defines the timestamp + as an unsigned 32 bit value. */ +u32 +make_timestamp (void) +{ + time_t t = gnupg_get_time (); + return (u32)t; +} + + + +/**************** + * Scan a date string and return a timestamp. + * The only supported format is "yyyy-mm-dd" + * Returns 0 for an invalid date. + */ +u32 +scan_isodatestr( const char *string ) +{ + int year, month, day; + struct tm tmbuf; + time_t stamp; + int i; + + if( strlen(string) != 10 || string[4] != '-' || string[7] != '-' ) + return 0; + for( i=0; i < 4; i++ ) + if( !digitp (string+i) ) + return 0; + if( !digitp (string+5) || !digitp(string+6) ) + return 0; + if( !digitp(string+8) || !digitp(string+9) ) + return 0; + year = atoi(string); + month = atoi(string+5); + day = atoi(string+8); + /* some basic checks */ + if( year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ) + return 0; + memset( &tmbuf, 0, sizeof tmbuf ); + tmbuf.tm_mday = day; + tmbuf.tm_mon = month-1; + tmbuf.tm_year = year - 1900; + tmbuf.tm_isdst = -1; + stamp = mktime( &tmbuf ); + if( stamp == (time_t)-1 ) + return 0; + return stamp; +} + + +int +isotime_p (const char *string) +{ + const char *s; + int i; + + if (!*string) + return 0; + for (s=string, i=0; i < 8; i++, s++) + if (!digitp (s)) + return 0; + if (*s != 'T') + return 0; + for (s++, i=9; i < 15; i++, s++) + if (!digitp (s)) + return 0; + if (*s == 'Z') + s++; + if ( !(!*s || (isascii (*s) && isspace(*s)) || *s == ':' || *s == ',')) + return 0; /* Wrong delimiter. */ + + return 1; +} + + +/* Scan a string and return true if the string represents the human + readable format of an ISO time. This format is: + yyyy-mm-dd[ hh[:mm[:ss]]] + Scanning stops at the second space or at a comma. If DATE_ONLY is + true the time part is not expected and the scanning stops at the + first space or at a comma. */ +int +isotime_human_p (const char *string, int date_only) +{ + const char *s; + int i; + + if (!*string) + return 0; + for (s=string, i=0; i < 4; i++, s++) + if (!digitp (s)) + return 0; + if (*s != '-') + return 0; + s++; + if (!digitp (s) || !digitp (s+1) || s[2] != '-') + return 0; + i = atoi_2 (s); + if (i < 1 || i > 12) + return 0; + s += 3; + if (!digitp (s) || !digitp (s+1)) + return 0; + i = atoi_2 (s); + if (i < 1 || i > 31) + return 0; + s += 2; + if (!*s || *s == ',') + return 1; /* Okay; only date given. */ + if (!spacep (s)) + return 0; + if (date_only) + return 1; /* Okay; only date was requested. */ + s++; + if (spacep (s)) + return 1; /* Okay, second space stops scanning. */ + if (!digitp (s) || !digitp (s+1)) + return 0; + i = atoi_2 (s); + if (i < 0 || i > 23) + return 0; + s += 2; + if (!*s || *s == ',') + return 1; /* Okay; only date and hour given. */ + if (*s != ':') + return 0; + s++; + if (!digitp (s) || !digitp (s+1)) + return 0; + i = atoi_2 (s); + if (i < 0 || i > 59) + return 0; + s += 2; + if (!*s || *s == ',') + return 1; /* Okay; only date, hour and minute given. */ + if (*s != ':') + return 0; + s++; + if (!digitp (s) || !digitp (s+1)) + return 0; + i = atoi_2 (s); + if (i < 0 || i > 60) + return 0; + s += 2; + if (!*s || *s == ',' || spacep (s)) + return 1; /* Okay; date, hour and minute and second given. */ + + return 0; /* Unexpected delimiter. */ +} + +/* Convert a standard isotime or a human readable variant into an + isotime structure. The allowed formats are those described by + isotime_p and isotime_human_p. The function returns 0 on failure + or the length of the scanned string on success. */ +size_t +string2isotime (gnupg_isotime_t atime, const char *string) +{ + gnupg_isotime_t dummyatime; + + if (!atime) + atime = dummyatime; + + atime[0] = 0; + if (isotime_p (string)) + { + memcpy (atime, string, 15); + atime[15] = 0; + return 15; + } + if (!isotime_human_p (string, 0)) + return 0; + atime[0] = string[0]; + atime[1] = string[1]; + atime[2] = string[2]; + atime[3] = string[3]; + atime[4] = string[5]; + atime[5] = string[6]; + atime[6] = string[8]; + atime[7] = string[9]; + atime[8] = 'T'; + memset (atime+9, '0', 6); + atime[15] = 0; + if (!spacep (string+10)) + return 10; + if (spacep (string+11)) + return 11; /* As per def, second space stops scanning. */ + atime[9] = string[11]; + atime[10] = string[12]; + if (string[13] != ':') + return 13; + atime[11] = string[14]; + atime[12] = string[15]; + if (string[16] != ':') + return 16; + atime[13] = string[17]; + atime[14] = string[18]; + return 19; +} + + +/* Scan an ISO timestamp and return an Epoch based timestamp. The + only supported format is "yyyymmddThhmmss[Z]" delimited by white + space, nul, a colon or a comma. Returns (time_t)(-1) for an + invalid string. */ +time_t +isotime2epoch (const char *string) +{ + int year, month, day, hour, minu, sec; + struct tm tmbuf; + + if (!isotime_p (string)) + return (time_t)(-1); + + year = atoi_4 (string); + month = atoi_2 (string + 4); + day = atoi_2 (string + 6); + hour = atoi_2 (string + 9); + minu = atoi_2 (string + 11); + sec = atoi_2 (string + 13); + + /* Basic checks. */ + if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 + || hour > 23 || minu > 59 || sec > 61 ) + return (time_t)(-1); + + memset (&tmbuf, 0, sizeof tmbuf); + tmbuf.tm_sec = sec; + tmbuf.tm_min = minu; + tmbuf.tm_hour = hour; + tmbuf.tm_mday = day; + tmbuf.tm_mon = month-1; + tmbuf.tm_year = year - 1900; + tmbuf.tm_isdst = -1; + return timegm (&tmbuf); +} + + +/* Convert an Epoch time to an iso time stamp. */ +void +epoch2isotime (gnupg_isotime_t timebuf, time_t atime) +{ + if (atime == (time_t)(-1)) + *timebuf = 0; + else + { + struct tm *tp; +#ifdef HAVE_GMTIME_R + struct tm tmbuf; + + tp = gmtime_r (&atime, &tmbuf); +#else + tp = gmtime (&atime); +#endif + snprintf (timebuf, 16, "%04d%02d%02dT%02d%02d%02d", + 1900 + tp->tm_year, tp->tm_mon+1, tp->tm_mday, + tp->tm_hour, tp->tm_min, tp->tm_sec); + } +} + + +/* Parse a short ISO date string (YYYY-MM-DD) into a TM structure. + Returns 0 on success. */ +int +isodate_human_to_tm (const char *string, struct tm *t) +{ + int year, month, day; + + if (!isotime_human_p (string, 1)) + return -1; + + year = atoi_4 (string); + month = atoi_2 (string + 5); + day = atoi_2 (string + 8); + + /* Basic checks. */ + if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31) + return -1; + + memset (t, 0, sizeof *t); + t->tm_sec = 0; + t->tm_min = 0; + t->tm_hour = 0; + t->tm_mday = day; + t->tm_mon = month-1; + t->tm_year = year - 1900; + t->tm_isdst = -1; + return 0; +} + + +/* This function is a copy of gpgme/src/conversion.c:_gpgme_timegm. + If you change it, then update the other one too. */ +#ifdef HAVE_W32_SYSTEM +static time_t +_win32_timegm (struct tm *tm) +{ + /* This one is thread safe. */ + SYSTEMTIME st; + FILETIME ft; + unsigned long long cnsecs; + + st.wYear = tm->tm_year + 1900; + st.wMonth = tm->tm_mon + 1; + st.wDay = tm->tm_mday; + st.wHour = tm->tm_hour; + st.wMinute = tm->tm_min; + st.wSecond = tm->tm_sec; + st.wMilliseconds = 0; /* Not available. */ + st.wDayOfWeek = 0; /* Ignored. */ + + /* System time is UTC thus the conversion is pretty easy. */ + if (!SystemTimeToFileTime (&st, &ft)) + { + gpg_err_set_errno (EINVAL); + return (time_t)(-1); + } + + cnsecs = (((unsigned long long)ft.dwHighDateTime << 32) + | ft.dwLowDateTime); + cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01. */ + return (time_t)(cnsecs / 10000000ULL); +} +#endif + + +/* Parse the string TIMESTAMP into a time_t. The string may either be + seconds since Epoch or in the ISO 8601 format like + "20390815T143012". Returns 0 for an empty string or seconds since + Epoch. Leading spaces are skipped. If ENDP is not NULL, it will + point to the next non-parsed character in TIMESTRING. + + This function is a copy of + gpgme/src/conversion.c:_gpgme_parse_timestamp. If you change it, + then update the other one too. */ +time_t +parse_timestamp (const char *timestamp, char **endp) +{ + /* Need to skip leading spaces, because that is what strtoul does + but not our ISO 8601 checking code. */ + while (*timestamp && *timestamp== ' ') + timestamp++; + if (!*timestamp) + return 0; + + if (strlen (timestamp) >= 15 && timestamp[8] == 'T') + { + struct tm buf; + int year; + + year = atoi_4 (timestamp); + if (year < 1900) + return (time_t)(-1); + + if (endp) + *endp = (char*)(timestamp + 15); + + /* Fixme: We would better use a configure test to see whether + mktime can handle dates beyond 2038. */ + if (sizeof (time_t) <= 4 && year >= 2038) + return (time_t)2145914603; /* 2037-12-31 23:23:23 */ + + memset (&buf, 0, sizeof buf); + buf.tm_year = year - 1900; + buf.tm_mon = atoi_2 (timestamp+4) - 1; + buf.tm_mday = atoi_2 (timestamp+6); + buf.tm_hour = atoi_2 (timestamp+9); + buf.tm_min = atoi_2 (timestamp+11); + buf.tm_sec = atoi_2 (timestamp+13); + +#ifdef HAVE_W32_SYSTEM + return _win32_timegm (&buf); +#else +#ifdef HAVE_TIMEGM + return timegm (&buf); +#else + { + time_t tim; + + putenv ("TZ=UTC"); + tim = mktime (&buf); +#ifdef __GNUC__ +#warning fixme: we must somehow reset TZ here. It is not threadsafe anyway. +#endif + return tim; + } +#endif /* !HAVE_TIMEGM */ +#endif /* !HAVE_W32_SYSTEM */ + } + else + return (time_t)strtoul (timestamp, endp, 10); +} + + + +u32 +add_days_to_timestamp( u32 stamp, u16 days ) +{ + return stamp + days*86400L; +} + + +/**************** + * Return a string with a time value in the form: x Y, n D, n H + */ + +const char * +strtimevalue( u32 value ) +{ + static char buffer[30]; + unsigned int years, days, hours, minutes; + + value /= 60; + minutes = value % 60; + value /= 60; + hours = value % 24; + value /= 24; + days = value % 365; + value /= 365; + years = value; + + sprintf(buffer,"%uy%ud%uh%um", years, days, hours, minutes ); + if( years ) + return buffer; + if( days ) + return strchr( buffer, 'y' ) + 1; + return strchr( buffer, 'd' ) + 1; +} + + + +/* Return a malloced string with the time elapsed between NOW and + SINCE. May return NULL on error. */ +char * +elapsed_time_string (time_t since, time_t now) +{ + char *result; + double diff; + unsigned long value; + unsigned int days, hours, minutes, seconds; + + if (!now) + now = gnupg_get_time (); + + diff = difftime (now, since); + if (diff < 0) + return xtrystrdup ("time-warp"); + + seconds = (unsigned long)diff % 60; + value = (unsigned long)(diff / 60); + minutes = value % 60; + value /= 60; + hours = value % 24; + value /= 24; + days = value % 365; + + if (days) + result = xtryasprintf ("%ud%uh%um%us", days, hours, minutes, seconds); + else if (hours) + result = xtryasprintf ("%uh%um%us", hours, minutes, seconds); + else if (minutes) + result = xtryasprintf ("%um%us", minutes, seconds); + else + result = xtryasprintf ("%us", seconds); + + return result; +} + + +/* + * Note: this function returns GMT + */ +const char * +strtimestamp (u32 stamp) +{ + static char buffer[11+5]; + struct tm *tp; + time_t atime = stamp; + + if (IS_INVALID_TIME_T (atime)) + { + strcpy (buffer, "????" "-??" "-??"); + } + else + { + tp = gmtime( &atime ); + snprintf (buffer, sizeof buffer, "%04d-%02d-%02d", + 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday ); + } + return buffer; +} + + +/* + * Note: this function returns GMT + */ +const char * +isotimestamp (u32 stamp) +{ + static char buffer[25+5]; + struct tm *tp; + time_t atime = stamp; + + if (IS_INVALID_TIME_T (atime)) + { + strcpy (buffer, "????" "-??" "-??" " " "??" ":" "??" ":" "??"); + } + else + { + tp = gmtime ( &atime ); + snprintf (buffer, sizeof buffer, "%04d-%02d-%02d %02d:%02d:%02d", + 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday, + tp->tm_hour, tp->tm_min, tp->tm_sec); + } + return buffer; +} + + +/* Windows version of strftime returning the string as utf-8. */ +#ifdef HAVE_W32_SYSTEM + +#define strftime(a,b,c,d) w32_strftime ((a),(b),(c),(d)) + +static size_t +w32_strftime (char *s, size_t max, const char *format, const struct tm *tm) +{ + wchar_t *wformatbuf = NULL; + const wchar_t *wformat = L"%c %Z"; + wchar_t wbuf[200]; + size_t n; + char *buf; + + if (strcmp (format, "%c %Z")) + { + log_debug (" comverted\n"); + wformatbuf = utf8_to_wchar (format); + if (wformatbuf) + wformat = wformatbuf; + } + + n = wcsftime (wbuf, sizeof wbuf, wformat, tm); + xfree (wformatbuf); + if (!n) + { + /* Most likely the buffer is too short - try ISO format instead. */ + n = wcsftime (wbuf, sizeof wbuf, L"%Y-%m-%d %H:%M:%S", tm); + if (!n) + wcscpy (wbuf, L"[????" "-??" "-??]"); + } + buf = wchar_to_utf8 (wbuf); + mem2str (s, buf? buf : "[????" "-??" "-??]", max); + xfree (buf); + return strlen (s) + 1; +} +#endif /*HAVE_W32_SYSTEM*/ + + + +/**************** + * Note: this function returns local time + */ +const char * +asctimestamp (u32 stamp) +{ + static char buffer[80]; +#if defined (HAVE_STRFTIME) && defined (HAVE_NL_LANGINFO) + static char fmt[80]; +#endif + struct tm *tp; + time_t atime = stamp; + + if (IS_INVALID_TIME_T (atime)) + { + strcpy (buffer, "????" "-??" "-??"); + return buffer; + } + tp = localtime( &atime ); +#ifdef HAVE_STRFTIME +# if defined(HAVE_NL_LANGINFO) + mem2str( fmt, nl_langinfo(D_T_FMT), DIM(fmt)-3 ); + if (!strstr( fmt, "%Z" )) + strcat( fmt, " %Z"); + /* NOTE: gcc -Wformat-noliteral will complain here. I have found no + way to suppress this warning. */ + strftime (buffer, DIM(buffer)-1, fmt, tp); +# elif defined(HAVE_W32CE_SYSTEM) + /* tzset is not available but %Z nevertheless prints a default + nonsense timezone ("WILDABBR"). Thus we don't print the time + zone at all. */ + strftime (buffer, DIM(buffer)-1, "%c", tp); +# else +# if HAVE_W32_SYSTEM + { + static int done; + + if (!done) + { + /* The locale names as used by Windows are in the form + * "German_Germany.1252" or "German_Austria.1252" with + * alternate names similar to Unix, e.g. "de-DE". However + * that is the theory. On current Windows and Mingw the + * alternate names do not work. We would need a table to map + * them from the short names as provided by gpgrt to the long + * names and append some code page. For now we use "" and + * take the locale from the user's system settings. Thus the + * standard Unix envvars don't work for time and may mismatch + * with the string translations. The new UCRT available since + * 2018 has a lot of additional support but that will for sure + * break other things. We should move to ISO strings to get + * rid of such problems. */ + setlocale (LC_TIME, ""); + done = 1; + /* log_debug ("LC_ALL now '%s'\n", setlocale (LC_ALL, NULL)); */ + /* log_debug ("LC_TIME now '%s'\n", setlocale (LC_TIME, NULL)); */ + } + } +# endif + /* FIXME: we should check whether the locale appends a " %Z" These + * locales from glibc don't put the " %Z": fi_FI hr_HR ja_JP lt_LT + * lv_LV POSIX ru_RU ru_SU sv_FI sv_SE zh_CN. */ + strftime (buffer, DIM(buffer)-1, "%c %Z", tp); +# endif + buffer[DIM(buffer)-1] = 0; +#else + mem2str( buffer, asctime(tp), DIM(buffer) ); +#endif + return buffer; +} + + +/* Return the timestamp STAMP in RFC-2822 format. This is always done + * in the C locale. We return the gmtime to avoid computing the + * timezone. The caller must release the returned string. + * + * Example: "Mon, 27 Jun 2016 1:42:00 +0000". + */ +char * +rfctimestamp (u32 stamp) +{ + time_t atime = stamp; + struct tm tmbuf, *tp; + + + if (IS_INVALID_TIME_T (atime)) + { + gpg_err_set_errno (EINVAL); + return NULL; + } + + tp = gnupg_gmtime (&atime, &tmbuf); + if (!tp) + return NULL; + return xtryasprintf ("%.3s, %02d %.3s %04d %02d:%02d:%02d +0000", + &"SunMonTueWedThuFriSat"[(tp->tm_wday%7)*3], + tp->tm_mday, + &"JanFebMarAprMayJunJulAugSepOctNovDec" + [(tp->tm_mon%12)*3], + tp->tm_year + 1900, + tp->tm_hour, + tp->tm_min, + tp->tm_sec); +} + + +static int +days_per_year (int y) +{ + int s ; + + s = !(y % 4); + if ( !(y % 100)) + if ((y%400)) + s = 0; + return s ? 366 : 365; +} + +static int +days_per_month (int y, int m) +{ + int s; + + switch(m) + { + case 1: case 3: case 5: case 7: case 8: case 10: case 12: + return 31 ; + case 2: + s = !(y % 4); + if (!(y % 100)) + if ((y % 400)) + s = 0; + return s? 29 : 28 ; + case 4: case 6: case 9: case 11: + return 30; + } + BUG(); +} + + +/* Convert YEAR, MONTH and DAY into the Julian date. We assume that + it is already noon. We do not support dates before 1582-10-15. */ +static unsigned long +date2jd (int year, int month, int day) +{ + unsigned long jd; + + jd = 365L * year + 31 * (month-1) + day + JD_DIFF; + if (month < 3) + year-- ; + else + jd -= (4 * month + 23) / 10; + + jd += year / 4 - ((year / 100 + 1) *3) / 4; + + return jd ; +} + +/* Convert a Julian date back to YEAR, MONTH and DAY. Return day of + the year or 0 on error. This function uses some more or less + arbitrary limits, most important is that days before 1582 are not + supported. */ +static int +jd2date (unsigned long jd, int *year, int *month, int *day) +{ + int y, m, d; + long delta; + + if (!jd) + return 0 ; + if (jd < 1721425 || jd > 2843085) + return 0; + + y = (jd - JD_DIFF) / 366; + d = m = 1; + + while ((delta = jd - date2jd (y, m, d)) > days_per_year (y)) + y++; + + m = (delta / 31) + 1; + while( (delta = jd - date2jd (y, m, d)) > days_per_month (y,m)) + if (++m > 12) + { + m = 1; + y++; + } + + d = delta + 1 ; + if (d > days_per_month (y, m)) + { + d = 1; + m++; + } + if (m > 12) + { + m = 1; + y++; + } + + if (year) + *year = y; + if (month) + *month = m; + if (day) + *day = d ; + + return (jd - date2jd (y, 1, 1)) + 1; +} + + +/* Check that the 15 bytes in ATIME represent a valid ISO time. Note + that this function does not expect a string but a plain 15 byte + isotime buffer. */ +gpg_error_t +check_isotime (const gnupg_isotime_t atime) +{ + int i; + const char *s; + + if (!*atime) + return gpg_error (GPG_ERR_NO_VALUE); + + for (s=atime, i=0; i < 8; i++, s++) + if (!digitp (s)) + return gpg_error (GPG_ERR_INV_TIME); + if (*s != 'T') + return gpg_error (GPG_ERR_INV_TIME); + for (s++, i=9; i < 15; i++, s++) + if (!digitp (s)) + return gpg_error (GPG_ERR_INV_TIME); + return 0; +} + + +/* Dump the ISO time T to the log stream without a LF. */ +void +dump_isotime (const gnupg_isotime_t t) +{ + if (!t || !*t) + log_printf ("%s", _("[none]")); + else + log_printf ("%.4s-%.2s-%.2s %.2s:%.2s:%s", + t, t+4, t+6, t+9, t+11, t+13); +} + + +/* Copy one ISO date to another, this is inline so that we can do a + minimal sanity check. A null date (empty string) is allowed. */ +void +gnupg_copy_time (gnupg_isotime_t d, const gnupg_isotime_t s) +{ + if (*s) + { + if ((strlen (s) != 15 || s[8] != 'T')) + BUG(); + memcpy (d, s, 15); + d[15] = 0; + } + else + *d = 0; +} + + +/* Add SECONDS to ATIME. SECONDS may not be negative and is limited + to about the equivalent of 62 years which should be more then + enough for our purposes. */ +gpg_error_t +add_seconds_to_isotime (gnupg_isotime_t atime, int nseconds) +{ + gpg_error_t err; + int year, month, day, hour, minute, sec, ndays; + unsigned long jd; + + err = check_isotime (atime); + if (err) + return err; + + if (nseconds < 0 || nseconds >= (0x7fffffff - 61) ) + return gpg_error (GPG_ERR_INV_VALUE); + + year = atoi_4 (atime+0); + month = atoi_2 (atime+4); + day = atoi_2 (atime+6); + hour = atoi_2 (atime+9); + minute= atoi_2 (atime+11); + sec = atoi_2 (atime+13); + + if (year <= 1582) /* The julian date functions don't support this. */ + return gpg_error (GPG_ERR_INV_VALUE); + + sec += nseconds; + minute += sec/60; + sec %= 60; + hour += minute/60; + minute %= 60; + ndays = hour/24; + hour %= 24; + + jd = date2jd (year, month, day) + ndays; + jd2date (jd, &year, &month, &day); + + if (year > 9999 || month > 12 || day > 31 + || year < 0 || month < 1 || day < 1) + return gpg_error (GPG_ERR_INV_VALUE); + + snprintf (atime, 16, "%04d%02d%02dT%02d%02d%02d", + year, month, day, hour, minute, sec); + return 0; +} + + +gpg_error_t +add_days_to_isotime (gnupg_isotime_t atime, int ndays) +{ + gpg_error_t err; + int year, month, day, hour, minute, sec; + unsigned long jd; + + err = check_isotime (atime); + if (err) + return err; + + if (ndays < 0 || ndays >= 9999*366 ) + return gpg_error (GPG_ERR_INV_VALUE); + + year = atoi_4 (atime+0); + month = atoi_2 (atime+4); + day = atoi_2 (atime+6); + hour = atoi_2 (atime+9); + minute= atoi_2 (atime+11); + sec = atoi_2 (atime+13); + + if (year <= 1582) /* The julian date functions don't support this. */ + return gpg_error (GPG_ERR_INV_VALUE); + + jd = date2jd (year, month, day) + ndays; + jd2date (jd, &year, &month, &day); + + if (year > 9999 || month > 12 || day > 31 + || year < 0 || month < 1 || day < 1) + return gpg_error (GPG_ERR_INV_VALUE); + + snprintf (atime, 16, "%04d%02d%02dT%02d%02d%02d", + year, month, day, hour, minute, sec); + return 0; +} |