diff --git a/lib/libc/locale/wcstod.c b/lib/libc/locale/wcstod.c
index 8bc46a7c3ad4..c6ae1417c1de 100644
--- a/lib/libc/locale/wcstod.c
+++ b/lib/libc/locale/wcstod.c
@@ -54,11 +54,13 @@ wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 	mbstate_t mbs;
 	double val;
 	char *buf, *end;
-	const wchar_t *wcp = nptr;
+	const wchar_t *wcp;
 	size_t len;
-	size_t spaces = 0;
+	size_t spaces;
 	FIX_LOCALE(locale);
 
+	wcp = nptr;
+	spaces = 0;
 	while (iswspace_l(*wcp, locale)) {
 		wcp++;
 		spaces++;
@@ -80,8 +82,11 @@ wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 			*endptr = (wchar_t *)nptr;
 		return (0.0);
 	}
-	if ((buf = malloc(len + 1)) == NULL)
+	if ((buf = malloc(len + 1)) == NULL) {
+		if (endptr != NULL)
+			*endptr = (wchar_t *)nptr;
 		return (0.0);
+	}
 	mbs = initial;
 	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
 
@@ -95,13 +100,11 @@ wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 	 * corresponding position in the wide char string.
 	 */
 	if (endptr != NULL) {
-		/* XXX Assume each wide char is one byte. */
 		*endptr = (wchar_t *)nptr + (end - buf);
 		if (buf != end)
 			*endptr += spaces;
 	}
 
-
 	free(buf);
 
 	return (val);
diff --git a/lib/libc/locale/wcstof.c b/lib/libc/locale/wcstof.c
index 93a5af838187..99ce0fe4af2c 100644
--- a/lib/libc/locale/wcstof.c
+++ b/lib/libc/locale/wcstof.c
@@ -50,27 +50,37 @@ wcstof_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 	char *buf, *end;
 	const wchar_t *wcp;
 	size_t len;
+	size_t spaces;
 	FIX_LOCALE(locale);
 
-	while (iswspace_l(*nptr, locale))
-		nptr++;
-
 	wcp = nptr;
+	spaces = 0;
+	while (iswspace_l(*wcp, locale)) {
+		wcp++;
+		spaces++;
+	}
+
 	mbs = initial;
 	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
 		if (endptr != NULL)
 			*endptr = (wchar_t *)nptr;
 		return (0.0);
 	}
-	if ((buf = malloc(len + 1)) == NULL)
+	if ((buf = malloc(len + 1)) == NULL) {
+		if (endptr != NULL)
+			*endptr = (wchar_t *)nptr;
 		return (0.0);
+	}
 	mbs = initial;
 	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
 
 	val = strtof_l(buf, &end, locale);
 
-	if (endptr != NULL)
+	if (endptr != NULL) {
 		*endptr = (wchar_t *)nptr + (end - buf);
+		if (buf != end)
+			*endptr += spaces;
+	}
 
 	free(buf);
 
diff --git a/lib/libc/locale/wcstold.c b/lib/libc/locale/wcstold.c
index fcfd48f12d01..89c92d95d4f3 100644
--- a/lib/libc/locale/wcstold.c
+++ b/lib/libc/locale/wcstold.c
@@ -48,32 +48,35 @@ wcstold_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 	mbstate_t mbs;
 	long double val;
 	char *buf, *end;
-	const wchar_t *wcp = nptr;
+	const wchar_t *wcp;
 	size_t len;
-	size_t spaces = 0;
+	size_t spaces;
 	FIX_LOCALE(locale);
 
+	wcp = nptr;
+	spaces = 0;
 	while (iswspace_l(*wcp, locale)) {
 		wcp++;
 		spaces++;
 	}
 
-	wcp = nptr;
 	mbs = initial;
 	if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
 		if (endptr != NULL)
 			*endptr = (wchar_t *)nptr;
 		return (0.0);
 	}
-	if ((buf = malloc(len + 1)) == NULL)
+	if ((buf = malloc(len + 1)) == NULL) {
+		if (endptr != NULL)
+			*endptr = (wchar_t *)nptr;
 		return (0.0);
+	}
 	mbs = initial;
 	wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
 
 	val = strtold_l(buf, &end, locale);
 
 	if (endptr != NULL) {
-		/* XXX Assume each wide char is one byte. */
 		*endptr = (wchar_t *)nptr + (end - buf);
 		if (buf != end)
 			*endptr += spaces;