new files

lib/xanstrftime.c

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+/* xanstrftime.c -- format date/time into xmalloc'd storage
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   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 2, 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.  */
+
+/* Written by Jim Meyering. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "xanstrftime.h"
+
+#include "strftime.h"
+#include "xalloc.h"
+
+/* Return true if the nstrftime expansion of FORMAT (given DATE_TIME, etc.)
+   is the empty string (this happens with %p in many locales).
+   Otherwise, return false.  */
+static bool
+degenerate_format (char const *format, struct tm const *date_time,
+		   int ut, int ns)
+{
+  size_t format_len = strlen (format);
+  char *fake_fmt = xmalloc (format_len + 2);
+  bool degenerate;
+  char buf[2];
+
+  /* Create a copy of FORMAT with a space prepended.  */
+  fake_fmt[0] = ' ';
+  memcpy (&fake_fmt[1], format, format_len + 1);
+
+  degenerate = nstrftime (buf, sizeof buf, fake_fmt, date_time, ut, ns) == 1;
+  free (fake_fmt);
+
+  return degenerate;
+}
+
+/* Like nstrftime, but take no buffer or length parameters and
+   instead return the formatted result in malloc'd storage.
+   Call xalloc_die upon allocation failure.  */
+char *
+xanstrftime (char const *format, struct tm const *date_time, int ut, int ns)
+{
+  bool first = true;
+  char *buf = NULL;
+  size_t buf_length = 0;
+
+  while (true)
+    {
+      buf = X2REALLOC (buf, &buf_length);
+      if (nstrftime (buf, buf_length, format, date_time, ut, ns)
+	  || (first && degenerate_format (format, date_time, ut, ns)))
+	return buf;
+      first = false;
+    }
+}

lib/xanstrftime.h

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+/* declarations for xanstrftime.c
+
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   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 2, 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 <time.h>
+
+char *
+xanstrftime (char const *format, struct tm const *date_time, int ut, int ns);