MFp4: Implementations of the wcstof() and wcstold() functions.

1 files changed, 84 insertions, 0 deletions

diff --git a/lib/libc/locale/wcstof.c b/lib/libc/locale/wcstof.c
new file mode 100644
index 0000000..ebe392e
--- /dev/null
+++ b/lib/libc/locale/wcstof.c
@@ -0,0 +1,84 @@
+/*-
+ * Copyright (c) 2002, 2003 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 <stdlib.h>
+#include <wchar.h>
+#include <wctype.h>
+
+/*
+ * See wcstod() for comments as to the logic used.
+ */
+float
+wcstof(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
+{
+	static const mbstate_t initial;
+	mbstate_t state;
+	float val;
+	char *buf, *end, *p;
+	const wchar_t *wcp;
+	size_t clen, len;
+
+	while (iswspace(*nptr))
+		nptr++;
+
+	state = initial;
+	wcp = nptr;
+	if ((len = wcsrtombs(NULL, &wcp, 0, &state)) == (size_t)-1) {
+		if (endptr != NULL)
+			*endptr = (wchar_t *)nptr;
+		return (0.0);
+	}
+	if ((buf = malloc(len + 1)) == NULL)
+		return (0.0);
+	state = initial;
+	wcsrtombs(buf, &wcp, len + 1, &state);
+
+	val = strtof(buf, &end);
+
+	if (endptr != NULL) {
+#if 1					/* Fast, assume 1:1 WC:MBS mapping. */
+		*endptr = (wchar_t *)nptr + (end - buf);
+		(void)clen;
+		(void)p;
+#else					/* Slow, conservative approach. */
+		state = initial;
+		*endptr = (wchar_t *)nptr;
+		p = buf;
+		while (p < end &&
+		    (clen = mbrlen(p, end - p, &state)) > 0) {
+			p += clen;
+			(*endptr)++;
+		}
+#endif
+	}
+
+	free(buf);
+
+	return (val);
+}