msvcrt: Fix strtof() error reporting for values out of float range.

If the values weren't out of range for the internal strtod() call,
we still must mark them as out of range when returning as float.

Signed-off-by: Martin Storsjo <martin@martin.st>
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/msvcrt/string.c

@@ -1065,7 +1065,13 @@ double CDECL strtod( const char *str, char **end )
  */
 float CDECL _strtof_l( const char *str, char **end, _locale_t locale )
 {
-    return _strtod_l(str, end, locale);
+    double ret = _strtod_l(str, end, locale);
+    if (ret && isfinite(ret)) {
+        float f = ret;
+        if (!f || !isfinite(f))
+            *_errno() = ERANGE;
+    }
+    return ret;
 }
 
 /*********************************************************************

dlls/msvcrt/wcs.c

@@ -798,7 +798,13 @@ double CDECL _wtof_l(const wchar_t *str, _locale_t locale)
  */
 float CDECL _wcstof_l( const wchar_t *str, wchar_t **end, _locale_t locale )
 {
-    return _wcstod_l(str, end, locale);
+    double ret = _wcstod_l(str, end, locale);
+    if (ret && isfinite(ret)) {
+        float f = ret;
+        if (!f || !isfinite(f))
+            *_errno() = ERANGE;
+    }
+    return ret;
 }
 
 /*********************************************************************

dlls/ucrtbase/tests/string.c

@@ -152,6 +152,42 @@ static void test_strtod(void)
     test_strtod_str_errno("2.47e-324", 0, 9, ERANGE);
 }
 
+static void test_strtof(void)
+{
+    static const struct {
+        const char *str;
+        int len;
+        float ret;
+        int err;
+    } tests[] = {
+        { "12.1", 4, 12.1f },
+        { "-13.721", 7, -13.721f },
+        { "1.e40", 5, INFINITY, ERANGE },
+        { "-1.e40", 6, -INFINITY, ERANGE },
+        { "0.0", 3, 0.0f },
+        { "-0.0", 4, 0.0f },
+        { "1.4e-45", 7, 1.4e-45f },
+        { "-1.4e-45", 8, -1.4e-45f },
+        { "1.e-60", 6, 0, ERANGE },
+        { "-1.e-60", 7, 0, ERANGE },
+    };
+
+    char *end;
+    float f;
+    int i;
+
+    for (i=0; i<ARRAY_SIZE(tests); i++)
+    {
+        errno = 0xdeadbeef;
+        f = strtof(tests[i].str, &end);
+        ok(f == tests[i].ret, "%d) f = %.16e\n", i, f);
+        ok(end == tests[i].str + tests[i].len, "%d) len = %d\n",
+                i, (int)(end - tests[i].str));
+        ok(errno == tests[i].err || (!tests[i].err && errno == 0xdeadbeef),
+                "%d) errno = %d\n", i, errno);
+    }
+}
+
 static void test__memicmp(void)
 {
     static const char *s1 = "abc";
@@ -558,6 +594,7 @@ START_TEST(string)
             "Invalid parameter handler was already set\n");
 
     test_strtod();
+    test_strtof();
     test__memicmp();
     test__memicmp_l();
     test___strncnt();