lib: split out utils to lib/utils

lib/utils/mu-date.c

@@ -0,0 +1,87 @@
+/*
+** Copyright (C) 2012  <djcb@djcbsoftware.nl>
+**
+** 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, 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, write to the Free Software Foundation,
+** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+**
+*/
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "mu-util.h"
+#include "mu-date.h"
+#include "mu-str.h"
+
+const char*
+mu_date_str_s (const char* frm, time_t t)
+{
+	struct tm	*tmbuf;
+	static char	 buf[128];
+	static int	 is_utf8 = -1;
+	size_t		 len;
+
+	if (G_UNLIKELY(is_utf8 == -1))
+		is_utf8 = mu_util_locale_is_utf8 () ? 1 : 0;
+
+	g_return_val_if_fail (frm, NULL);
+
+	tmbuf = localtime(&t);
+	len = strftime (buf, sizeof(buf) - 1, frm, tmbuf);
+	if (len == 0)
+		return ""; /* not necessarily an error... */
+
+	if (!is_utf8) {
+		/* charset is _not_ utf8, so we need to convert it, so
+		 * the date could contain locale-specific characters*/
+		gchar *conv;
+		GError *err;
+		err = NULL;
+		conv = g_locale_to_utf8 (buf, -1, NULL, NULL, &err);
+		if (err) {
+			g_warning ("conversion failed: %s", err->message);
+			g_error_free (err);
+			strcpy (buf, "<error>");
+		} else {
+			strncpy (buf, conv, sizeof(buf)-1);
+			buf[sizeof(buf)-1] = '\0';
+		}
+
+		g_free (conv);
+	}
+
+	return buf;
+}
+
+char*
+mu_date_str (const char *frm, time_t t)
+{
+	return g_strdup (mu_date_str_s(frm, t));
+}
+
+
+const char*
+mu_date_display_s (time_t t)
+{
+	time_t now;
+	static const time_t SECS_IN_DAY = 24 * 60 * 60;
+
+	now = time (NULL);
+
+	if (ABS(now - t) > SECS_IN_DAY)
+		return mu_date_str_s ("%x", t);
+	else
+		return mu_date_str_s ("%X", t);
+}