Implement the ISO C90 Amd.1 restartable wide and multibyte character

manipulation functions mbrlen(), mbrtowc(), mbsinit(), mbsrtowcs(),
wcrtomb(), wcsrtombs().

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/libc/locale/mbsrtowcs.c b/lib/libc/locale/mbsrtowcs.c
new file mode 100644
index 0000000..25b6c17
--- /dev/null
+++ b/lib/libc/locale/mbsrtowcs.c
@@ -0,0 +1,74 @@
+/*-
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+size_t
+mbsrtowcs(wchar_t *__restrict dst, const char **__restrict src, size_t len,
+    mbstate_t *__restrict ps __unused)
+{
+	const char *s;
+	size_t nchr;
+	wchar_t wc;
+	int nb;
+
+	s = *src;
+	nchr = 0;
+
+	if (dst == NULL) {
+		for (;;) {
+			if ((nb = (int)mbrtowc(&wc, s, MB_CUR_MAX, NULL)) < 0)
+				/* Invalid sequence - mbrtowc() sets errno. */
+				return ((size_t)-1);
+			else if (nb == 0)
+				return (nchr);
+			s += nb;
+			nchr++;
+		}
+		/*NOTREACHED*/
+	}
+
+	while (len-- > 0) {
+		if ((nb = (int)mbrtowc(dst, s, MB_CUR_MAX, NULL)) < 0) {
+			*src = s;
+			return ((size_t)-1);
+		} else if (nb == 0) {
+			*src = NULL;
+			return (nchr);
+		}
+		s += nb;
+		nchr++;
+		dst++;
+	}
+	*src = s;
+	return (nchr);
+}