1 files changed, 109 insertions, 0 deletions
diff --git a/StdLib/LibC/Locale/wcsftime.c b/StdLib/LibC/Locale/wcsftime.c
new file mode 100644
index 0000000000..2eb19ca5ad
--- /dev/null
+++ b/StdLib/LibC/Locale/wcsftime.c
@@ -0,0 +1,109 @@
+/*   $NetBSD: wcsftime.c,v 1.2 2006/10/04 14:19:16 tnozaki 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  <LibConfig.h>
+#include  <sys/EfiCdefs.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 1.2 2006/10/04 14:19:16 tnozaki Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <time.h>
+#include <wchar.h>
+#include  <machine/int_limits.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)
+{
+  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.
+   */
+  sflen = wcstombs(NULL, format, 0);
+  if (sflen == (size_t)-1)
+    goto error;
+  if ((sformat = malloc(sflen + 1)) == NULL)
+    goto error;
+  wcstombs(sformat, format, sflen + 1);
+
+  /*
+   * 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;
+  }
+  dst = malloc(maxsize * MB_CUR_MAX);
+  if (dst == NULL)
+    goto error;
+  if (strftime(dst, maxsize, sformat, timeptr) == 0)
+    goto error;
+  dstp = dst;
+  n = mbstowcs(wcs, dstp, maxsize);
+  if (n == (size_t)-2 || n == (size_t)-1)
+    goto error;
+
+  free(sformat);
+  free(dst);
+  return n;
+
+error:
+  sverrno = errno;
+  free(sformat);
+  free(dst);
+  errno = sverrno;
+  return 0;
+}