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+/*
+ Time formatting functions
+
+ Copyright (C) 1994-2023
+ Free Software Foundation, Inc.
+
+ Written by:
+ Miguel de Icaza, 1994, 1995, 1996
+ Janne Kukonlehto, 1994, 1995, 1996
+ Dugan Porter, 1994, 1995, 1996
+ Jakub Jelinek, 1994, 1995, 1996
+ Mauricio Plaza, 1994, 1995, 1996
+
+ The file_date routine is mostly from GNU's fileutils package,
+ written by Richard Stallman and David MacKenzie.
+
+ This file is part of the Midnight Commander.
+
+ The Midnight Commander 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.
+
+ The Midnight Commander 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/>.
+ */
+
+/** \file
+ * \brief Source: time formatting functions
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <limits.h> /* MB_LEN_MAX */
+
+#include "lib/global.h"
+#include "lib/strutil.h"
+
+#include "lib/timefmt.h"
+
+/*** global variables ****************************************************************************/
+
+char *user_recent_timeformat = NULL; /* time format string for recent dates */
+char *user_old_timeformat = NULL; /* time format string for older dates */
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/*
+ * Cache variable for the i18n_checktimelength function,
+ * initially set to a clearly invalid value to show that
+ * it hasn't been initialized yet.
+ */
+static size_t i18n_timelength_cache = MAX_I18NTIMELENGTH + 1;
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Check strftime() results. Some systems (i.e. Solaris) have different
+ * short-month and month name sizes for different locales
+ */
+size_t
+i18n_checktimelength (void)
+{
+ size_t length = 0;
+ time_t testtime;
+ struct tm *lt;
+
+ if (i18n_timelength_cache <= MAX_I18NTIMELENGTH)
+ return i18n_timelength_cache;
+
+ testtime = time (NULL);
+ lt = localtime (&testtime);
+
+ if (lt == NULL)
+ {
+ /* huh, localtime() doesn't seem to work ... falling back to "(invalid)" */
+ length = str_term_width1 (_(INVALID_TIME_TEXT));
+ }
+ else
+ {
+ char buf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
+ size_t tlen;
+
+ /* We are interested in the longest possible date */
+ lt->tm_sec = lt->tm_min = lt->tm_hour = lt->tm_mday = 10;
+
+ /* Loop through all months to find out the longest one */
+ for (lt->tm_mon = 0; lt->tm_mon < 12; lt->tm_mon++)
+ {
+ strftime (buf, sizeof (buf) - 1, user_recent_timeformat, lt);
+ tlen = (size_t) str_term_width1 (buf);
+ length = MAX (tlen, length);
+ strftime (buf, sizeof (buf) - 1, user_old_timeformat, lt);
+ tlen = (size_t) str_term_width1 (buf);
+ length = MAX (tlen, length);
+ }
+
+ tlen = (size_t) str_term_width1 (_(INVALID_TIME_TEXT));
+ length = MAX (tlen, length);
+ }
+
+ /* Don't handle big differences. Use standard value (email bug, please) */
+ if (length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH)
+ length = STD_I18NTIMELENGTH;
+
+ /* Save obtained value to the cache */
+ i18n_timelength_cache = length;
+
+ return i18n_timelength_cache;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+file_date (time_t when)
+{
+ static char timebuf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
+ time_t current_time = time (NULL);
+ const char *fmt;
+
+ if (current_time > when + 6L * 30L * 24L * 60L * 60L /* Old. */
+ || current_time < when - 60L * 60L) /* In the future. */
+ /* The file is fairly old or in the future.
+ POSIX says the cutoff is 6 months old;
+ approximate this by 6*30 days.
+ Allow a 1 hour slop factor for what is considered "the future",
+ to allow for NFS server/client clock disagreement.
+ Show the year instead of the time of day. */
+
+ fmt = user_old_timeformat;
+ else
+ fmt = user_recent_timeformat;
+
+ FMT_LOCALTIME (timebuf, sizeof (timebuf), fmt, when);
+
+ return timebuf;
+}
+
+/* --------------------------------------------------------------------------------------------- */