/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of 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.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
. */
#ifdef HAVE_CONFIG_H
# include
#endif
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ISO_8601_START_WDAY 1 /* Monday */
#define ISO_8601_MAX_WDAY 4 /* Thursday */
#define MAXDAYS 366 /* Max. number of days in a year */
#define ISO_8601_OFF ((MAXDAYS / 7 + 2) * 7)
int
ISO_8601_weekdays (int yday, int wday)
{
return (yday
- (yday - wday + ISO_8601_MAX_WDAY + ISO_8601_OFF) % 7
+ ISO_8601_MAX_WDAY - ISO_8601_START_WDAY);
}
int
mu_c_streamftime (mu_stream_t str, const char *fmt, struct tm *input_tm,
struct mu_timezone *tz)
{
int rc = 0;
struct tm tm;
/* Copy input TM because it might have been received from gmtime and
the fmt might result in further calls to gmtime which will clobber
it. */
tm = *input_tm;
while (*fmt && rc == 0)
{
size_t len = strcspn (fmt, "%");
if (len)
{
rc = mu_stream_write (str, fmt, len, NULL);
if (rc)
break;
}
fmt += len;
restart:
if (!*fmt || !*++fmt)
break;
switch (*fmt)
{
case 'a':
/* The abbreviated weekday name. */
if (tm.tm_wday < 0 || tm.tm_wday > 6)
rc = ERANGE;
else
rc = mu_stream_write (str, _mu_datetime_short_wday[tm.tm_wday],
strlen (_mu_datetime_short_wday[tm.tm_wday]),
NULL);
break;
case 'A':
/* The full weekday name. */
if (tm.tm_wday < 0 || tm.tm_wday > 6)
rc = ERANGE;
else
rc = mu_stream_write (str, _mu_datetime_full_wday[tm.tm_wday],
strlen (_mu_datetime_full_wday[tm.tm_wday]),
NULL);
break;
case 'b':
case 'h':
/* The abbreviated month name. */
if (tm.tm_mon < 0 || tm.tm_mon > 11)
rc = ERANGE;
else
rc = mu_stream_write (str, _mu_datetime_short_month[tm.tm_mon],
strlen (_mu_datetime_short_month[tm.tm_mon]),
NULL);
break;
case 'B':
/* The full month name. */
if (tm.tm_mon < 0 || tm.tm_mon > 11)
rc = ERANGE;
else
rc = mu_stream_write (str, _mu_datetime_full_month[tm.tm_mon],
strlen (_mu_datetime_full_month[tm.tm_mon]),
NULL);
break;
case 'c':
/* The preferred date and time representation. */
rc = mu_c_streamftime (str, "%a %b %e %H:%M:%S %Y", &tm, tz);
break;
case 'C':
/* The century number (year/100) as a 2-digit integer. */
rc = mu_stream_printf (str, "%02d", (tm.tm_year + 1900) / 100);
break;
case 'd':
/* The day of the month as a decimal number (range 01 to 31). */
if (tm.tm_mday < 1 || tm.tm_mday > 31)
rc = ERANGE;
else
rc = mu_stream_printf (str, "%02d", tm.tm_mday);
break;
case 'D':
/* Equivalent to %m/%d/%y. */
rc = mu_c_streamftime (str, "%m/%d/%y", &tm, tz);
break;
case 'e':
/* Like %d, the day of the month as a decimal number, but a leading
zero is replaced by a space. */
if (tm.tm_mday < 1 || tm.tm_mday > 31)
rc = ERANGE;
else
rc = mu_stream_printf (str, "%2d", tm.tm_mday);
break;
case 'E':
/* Modifier. The Single Unix Specification mentions %Ec, %EC, %Ex,
%EX, %Ey, and %EY, which are supposed to use a corresponding
locale-dependent alternative representation.
A no-op in POSIX locale */
goto restart;
case 'F':
/* Equivalent to %Y-%m-%d (the ISO 8601 date format). */
rc = mu_c_streamftime (str, "%Y-%m-%d", &tm, tz);
break;
case 'V':
/* The ISO 8601:1988 week number of the current year as a decimal
number range 01 to 53, where week 1 is the first week that has
at least 4 days in the current year, and with Monday as the
first day of the week.
*/
case 'G':
/* The ISO 8601 year with century as a decimal number. The 4-digit
year corresponding to the ISO week number (see %V). This has
the same format and value as %y, except that if the ISO week
number belongs to the previous or next year, that year is used
instead.
*/
case 'g':
/* Like %G, but without century, that is, with a 2-digit year
(00-99). */
{
int year = tm.tm_year + 1900;
int days = ISO_8601_weekdays (tm.tm_yday, tm.tm_wday);
if (days < 0)
{
days = ISO_8601_weekdays (tm.tm_yday +
mu_datetime_year_days (year - 1),
tm.tm_wday);
year--;
}
else
{
int d = ISO_8601_weekdays (tm.tm_yday -
mu_datetime_year_days (year),
tm.tm_wday);
if (d >= 0)
{
year++;
days = d;
}
}
switch (*fmt)
{
case 'V':
rc = mu_stream_printf (str, "%02d", days / 7 + 1);
break;
case 'G':
rc = mu_stream_printf (str, "%4d", year);
break;
case 'g':
rc = mu_stream_printf (str, "%02d", year % 100);
}
}
break;
case 'H':
/* The hour as a decimal number using a 24-hour clock (range 00 to
23). */
rc = mu_stream_printf (str, "%02d", tm.tm_hour);
break;
case 'I':
/* The hour as a decimal number using a 12-hour clock (range 01 to
12). */
{
unsigned n = tm.tm_hour % 12;
rc = mu_stream_printf (str, "%02d", n == 0 ? 12 : n);
}
break;
case 'j':
/* The day of the year as a decimal number (range 001 to 366). */
rc = mu_stream_printf (str, "%03d", tm.tm_yday + 1);
break;
case 'k':
/* The hour (24-hour clock) as a decimal number (range 0 to 23);
single digits are preceded by a blank. */
rc = mu_stream_printf (str, "%2d", tm.tm_hour);
break;
case 'l':
/* The hour (12-hour clock) as a decimal number (range 1 to 12);
single digits are preceded by a blank. */
{
unsigned n = tm.tm_hour % 12;
rc = mu_stream_printf (str, "%2d", n == 0 ? 12 : n);
}
break;
case 'm':
/* The month as a decimal number (range 01 to 12). */
rc = mu_stream_printf (str, "%02d", tm.tm_mon + 1);
break;
case 'M':
/* The minute as a decimal number (range 00 to 59). */
rc = mu_stream_printf (str, "%02d", tm.tm_min);
break;
case 'n':
/* A newline character. */
rc = mu_stream_write (str, "\n", 1, NULL);
break;
case 'O':
/* Modifier. The Single Unix Specification mentions %Od, %Oe, %OH,
%OI, %Om, %OM, %OS, %Ou, %OU, %OV, %Ow, %OW, and %Oy, which are
supposed to use alternative numeric symbols.
Hardly of any use for our purposes, hence a no-op. */
goto restart;
case 'p':
/* Either "AM" or "PM" according to the given time value.
Noon is treated as "PM" and midnight as "AM". */
rc = mu_stream_write (str,
tm.tm_hour < 12 ? "AM" : "PM",
2, NULL);
break;
case 'P':
/* Like %p but in lowercase: "am" or "pm". */
rc = mu_stream_write (str,
tm.tm_hour < 12 ? "am" : "pm",
2, NULL);
break;
case 'r':
/* The time in a.m. or p.m. notation, i.e. %I:%M:%S %p. */
rc = mu_c_streamftime (str, "%I:%M:%S %p", &tm, tz);
break;
case 'R':
/* The time in 24-hour notation (%H:%M) */
rc = mu_c_streamftime (str, "%H:%M", &tm, tz);
break;
case 's':
/* The number of seconds since the Epoch */
rc = mu_stream_printf (str, "%lu",
(unsigned long) mu_datetime_to_utc (&tm, tz));
break;
case 'S':
/* The second as a decimal number (range 00 to 60) */
rc = mu_stream_printf (str, "%02d", tm.tm_sec);
break;
case 't':
/* A tab character. */
rc = mu_stream_write (str, "\t", 1, NULL);
break;
case 'T':
/* The time in 24-hour notation (%H:%M:%S) */
rc = mu_c_streamftime (str, "%H:%M:%S", &tm, tz);
break;
case 'u':
/* The day of the week as a decimal, range 1 to 7, Monday being 1.
*/
rc = mu_stream_printf (str, "%1d",
tm.tm_wday == 0 ? 7 : tm.tm_wday);
break;
case 'U':
/* The week number of the current year as a decimal number, range
00 to 53, starting with the first Sunday as the first day of
week 01.
*/
rc = mu_stream_printf (str, "%02d",
(tm.tm_yday - tm.tm_wday + 7) / 7);
break;
case 'w':
/* The day of the week as a decimal, range 0 to 6, Sunday being 0.
*/
rc = mu_stream_printf (str, "%01d", tm.tm_wday);
break;
case 'W':
/* The week number of the current year as a decimal number, range
00 to 53, starting with the first Monday as the first day of
week 01. */
rc = mu_stream_printf (str, "%02d",
(tm.tm_yday - (tm.tm_wday - 1 + 7) % 7 + 7) / 7);
break;
/* The preferred date representation without the time:
equivalent to %D */
case 'x':
rc = mu_c_streamftime (str, "%m/%d/%y", &tm, tz);
break;
case 'X':
/* The preferred date representation without the date */
rc = mu_c_streamftime (str, "%H:%M:%S", &tm, tz);
break;
case 'y':
/* The year as a decimal number without a century (range 00 to 99).
*/
rc = mu_stream_printf (str, "%02d", (tm.tm_year + 1900) % 100);
break;
case 'Y':
/* The year as a decimal number including the century. */
rc = mu_stream_printf (str, "%d", tm.tm_year + 1900);
break;
case 'Z':
/* The timezone or name or abbreviation. */
if (tz && tz->tz_name)
{
rc = mu_stream_printf (str, "%s", tz->tz_name);
break;
}
/* fall through */
case 'z':
/* The time-zone as hour offset from GMT, for formatting RFC-822
dates (e.g. "%a, %d %b %Y %H:%M:%S %z") */
{
int utc_off = tz ? tz->utc_offset : mu_utc_offset ();
int sign;
if (utc_off < 0)
{
sign = '-';
utc_off = - utc_off;
}
else
sign = '+';
utc_off /= 60;
rc = mu_stream_printf (str, "%c%02u%02u", sign,
utc_off / 60, utc_off % 60);
}
break;
case '%':
/* A literal '%' character. */
rc = mu_stream_write (str, "%", 1, NULL);
break;
case '$':
/* Ignored for compatibilty with mu_scan_datetime */
break;
case '+':
/* Not supported (date and time in date(1) format. */
default:
rc = mu_stream_write (str, fmt-1, 2, NULL);
break;
}
fmt++;
}
/* Restore input tm */
*input_tm = tm;
return rc;
}