[src/trunk]: src PR/29826: J. T. Conklin: Add wcsftime(3) (from FreeBSD)

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

details:   https://anonhg.NetBSD.org/src/rev/19aeea191925
branches:  trunk
changeset: 579873:19aeea191925
user:      christos <christos%NetBSD.org@localhost>
date:      Wed Mar 30 03:47:11 2005 +0000

description:
PR/29826: J. T. Conklin: Add wcsftime(3) (from FreeBSD)

diffstat:

 include/wchar.h              |    6 +-
 lib/libc/locale/Makefile.inc |    4 +-
 lib/libc/locale/wcsftime.c   |  112 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+), 3 deletions(-)

diffs (161 lines):

diff -r c38d639ae661 -r 19aeea191925 include/wchar.h
--- a/include/wchar.h   Wed Mar 30 01:33:30 2005 +0000
+++ b/include/wchar.h   Wed Mar 30 03:47:11 2005 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wchar.h,v 1.21 2005/02/03 04:39:32 perry Exp $ */
+/*     $NetBSD: wchar.h,v 1.22 2005/03/30 03:47:11 christos Exp $      */
 
 /*-
  * Copyright (c)1999 Citrus Project,
@@ -93,6 +93,8 @@
 #undef _BSD_SIZE_T_
 #endif
 
+struct tm;
+
 __BEGIN_DECLS
 wint_t btowc(int);
 size_t mbrlen(const char * __restrict, size_t, mbstate_t * __restrict);
@@ -108,6 +110,8 @@
 int    wcscoll(const wchar_t *, const wchar_t *);
 wchar_t        *wcscpy(wchar_t * __restrict, const wchar_t * __restrict);
 size_t wcscspn(const wchar_t *, const wchar_t *);
+size_t wcsftime(wchar_t * __restrict, size_t, const wchar_t * __restrict,
+           const struct tm * __restrict);
 size_t wcslen(const wchar_t *);
 wchar_t        *wcsncat(wchar_t * __restrict, const wchar_t * __restrict, size_t);
 int    wcsncmp(const wchar_t *, const wchar_t *, size_t);
diff -r c38d639ae661 -r 19aeea191925 lib/libc/locale/Makefile.inc
--- a/lib/libc/locale/Makefile.inc      Wed Mar 30 01:33:30 2005 +0000
+++ b/lib/libc/locale/Makefile.inc      Wed Mar 30 03:47:11 2005 +0000
@@ -1,12 +1,12 @@
 #      from: @(#)Makefile.inc  5.1 (Berkeley) 2/18/91
-#      $NetBSD: Makefile.inc,v 1.45 2003/03/11 09:21:23 tshiozak Exp $
+#      $NetBSD: Makefile.inc,v 1.46 2005/03/30 03:47:12 christos Exp $
 
 # locale sources
 .PATH: ${ARCHDIR}/locale ${.CURDIR}/locale
 
 SRCS+= _def_messages.c _def_monetary.c _def_numeric.c _def_time.c \
        ctypeio.c localeconv.c nl_langinfo.c setlocale.c setlocale1.c \
-       setlocale32.c __mb_cur_max.c wcscoll.c wcstod.c \
+       setlocale32.c __mb_cur_max.c wcscoll.c wcsftime.c wcstod.c \
        wcstol.c wcstoll.c wcstoimax.c wcstoul.c wcstoull.c wcstoumax.c \
        wcsxfrm.c aliasname.c
 MAN+=  nl_langinfo.3 setlocale.3
diff -r c38d639ae661 -r 19aeea191925 lib/libc/locale/wcsftime.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/libc/locale/wcsftime.c        Wed Mar 30 03:47:11 2005 +0000
@@ -0,0 +1,112 @@
+/*      $NetBSD: wcsftime.c,v 1.1 2005/03/30 03:47:12 christos 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 2005/03/30 03:47:12 christos 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;
+}