[src/netbsd-3]: src/lib/libc/locale Pull up revision 1.1 (requested by christ...

[tron <tron%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/dc8fd4a74e2e
branches:  netbsd-3
changeset: 575147:dc8fd4a74e2e
user:      tron <tron%NetBSD.org@localhost>
date:      Wed Apr 06 13:39:12 2005 +0000

description:
Pull up revision 1.1 (requested by christos in ticket #102):
PR/29826: J. T. Conklin: Add wcsftime(3) (from FreeBSD)

diffstat:

 lib/libc/locale/wcsftime.c |  112 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 112 insertions(+), 0 deletions(-)

diffs (116 lines):

diff -r ac7e6a8acfd9 -r dc8fd4a74e2e lib/libc/locale/wcsftime.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libc/locale/wcsftime.c        Wed Apr 06 13:39:12 2005 +0000
@@ -0,0 +1,112 @@
+/*      $NetBSD: wcsftime.c,v 1.1.2.2 2005/04/06 13:39:12 tron Exp $   */
+/*-
+ * Copyright (c) 2002 Tim J. Robbins
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+__FBSDID("$FreeBSD: src/lib/libc/locale/wcsftime.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
+#else
+__RCSID("$NetBSD: wcsftime.c,v 1.1.2.2 2005/04/06 13:39:12 tron Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <time.h>
+#include <wchar.h>
+
+/*
+ * Convert date and time to a wide-character string.
+ *
+ * This is the wide-character counterpart of strftime(). So that we do not
+ * have to duplicate the code of strftime(), we convert the format string to
+ * multibyte, call strftime(), then convert the result back into wide
+ * characters.
+ *
+ * This technique loses in the presence of stateful multibyte encoding if any
+ * of the conversions in the format string change conversion state. When
+ * stateful encoding is implemented, we will need to reset the state between
+ * format specifications in the format string.
+ */
+size_t
+wcsftime(wchar_t *wcs, size_t maxsize,
+    const wchar_t *format, const struct tm *timeptr)
+{
+       static const mbstate_t initial;
+       mbstate_t mbs;
+       char *dst, *dstp, *sformat;
+       size_t n, sflen;
+       int sverrno;
+
+       sformat = dst = NULL;
+
+       /*
+        * Convert the supplied format string to a multibyte representation
+        * for strftime(), which only handles single-byte characters.
+        */
+       mbs = initial;
+       sflen = wcsrtombs(NULL, &format, 0, &mbs);
+       if (sflen == (size_t)-1)
+               goto error;
+       if ((sformat = malloc(sflen + 1)) == NULL)
+               goto error;
+       mbs = initial;
+       wcsrtombs(sformat, &format, sflen + 1, &mbs);
+
+       /*
+        * Allocate memory for longest multibyte sequence that will fit
+        * into the caller's buffer and call strftime() to fill it.
+        * Then, copy and convert the result back into wide characters in
+        * the caller's buffer.
+        */
+       if (SIZE_T_MAX / MB_CUR_MAX <= maxsize) {
+               /* maxsize is preposturously large - avoid int. overflow. */
+               errno = EINVAL;
+               goto error;
+       }
+       if ((dst = malloc(maxsize * MB_CUR_MAX)) == NULL)
+               goto error;
+       if (strftime(dst, maxsize, sformat, timeptr) == 0)
+               goto error;
+       dstp = dst;
+       mbs = initial;
+       n = mbsrtowcs(wcs, (const char **)&dstp, maxsize, &mbs);
+       if (n == (size_t)-2 || n == (size_t)-1 || dstp != NULL)
+               goto error;
+
+       free(sformat);
+       free(dst);
+       return n;
+
+error:
+       sverrno = errno;
+       free(sformat);
+       free(dst);
+       errno = sverrno;
+       return 0;
+}