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authorSergey Poznyakoff <gray@gnu.org.ua>2011-12-08 17:04:29 +0200
committerSergey Poznyakoff <gray@gnu.org.ua>2011-12-08 18:33:56 +0200
commitacec689ef648adaa5c420049bfb775953e184bda (patch)
treeac5a96099e5a646fc24986650b4f9073c9e83642 /libmailutils/datetime/streamftime.c
parent5af1d3a7bd8149139ad59baa11501e3d11b138a7 (diff)
downloadmailutils-acec689ef648adaa5c420049bfb775953e184bda.tar.gz
mailutils-acec689ef648adaa5c420049bfb775953e184bda.tar.bz2
Revamp date/time calculations.
* configure.ac: Build libmailutils/datetime/Makefile.am * include/mailutils/datetime.h (mu_datetime_julianday) (mu_datetime_dayofweek,mu_datetime_dayofyear) (mu_datetime_year_days): New protos. * libmailutils/Makefile.am (SUBDIRS): Add datetime (libmailutils_la_LIBADD): Add libdatetime.la * libmailutils/base/Makefile.am (libbase_la_SOURCES): Remove date.c and strftime.c. * libmailutils/base/date.c: Remove. * libmailutils/base/strftime.c: Move to libmailutils/datetime * libmailutils/datetime/Makefile.am: New file. * libmailutils/datetime/dow.c: New file. * libmailutils/datetime/doy.c: New file. * libmailutils/datetime/jd.c: New file. * libmailutils/datetime/scantime.c: New file. * libmailutils/datetime/streamftime.c: New file. * libmailutils/datetime/tab.c: New file. * libmailutils/datetime/unixtime.c: New file. * libmailutils/datetime/utcoff.c: New file. * libmailutils/datetime/yd.c: New file. * libmailutils/tests/scantime.at: Fix yday numbers.
Diffstat (limited to 'libmailutils/datetime/streamftime.c')
-rw-r--r--libmailutils/datetime/streamftime.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/libmailutils/datetime/streamftime.c b/libmailutils/datetime/streamftime.c
new file mode 100644
index 000000000..e67d7d4d0
--- /dev/null
+++ b/libmailutils/datetime/streamftime.c
@@ -0,0 +1,411 @@
+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 1999, 2000, 2001, 2002, 2007, 2009, 2010, 2011 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mailutils/diag.h>
+#include <mailutils/datetime.h>
+#include <mailutils/util.h>
+#include <mailutils/stream.h>
+#include <mailutils/errno.h>
+#include <mailutils/cstr.h>
+#include <mailutils/cctype.h>
+
+#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_tm2time (&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':
+ 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;
+}

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