msvcrt: Fix 0 parsing in parse_double helper.

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

dlls/msvcrt/string.c

@@ -744,7 +744,10 @@ double parse_double(MSVCRT_wchar_t (*get)(void *ctx), void (*unget)(void *ctx),
     }
 #endif
 
-    while(nch == '0') nch = get(ctx);
+    while(nch == '0') {
+        found_digit = TRUE;
+        nch = get(ctx);
+    }
 
     b.data[0] = 0;
     b.b = 0;

dlls/msvcrt/tests/string.c

@@ -1956,6 +1956,11 @@ static void test__strtod(void)
         { "0.1D-4736", 9, 0 },
         { "3.4028234663852887e38", 21, FLT_MAX },
         { "1.7976931348623158e+308", 23, DBL_MAX },
+        { "00", 2, 0 },
+        { "00.", 3, 0 },
+        { ".00", 3, 0 },
+        { "-0.", 3, 0 },
+        { "0e13", 4, 0 },
     };
     const char overflow[] = "1d9999999999999999999";