shlwapi: Skip duplicate '#' in WPRINTF_ParseFormat().

CW-Bug-Id: #24355

Author: Paul Gofman

dlls/shlwapi/tests/string.c

@@ -1714,6 +1714,8 @@ static void test_printf_format(void)
         { "%hhu", sizeof(ULONG), "10", NULL, 10 },
         { "%hwu", sizeof(ULONG), "10", NULL, 10 },
         { "%whu", sizeof(ULONG), "10", NULL, 10 },
+        { "%##lhllwlx", sizeof(ULONG64), "0x1000000010", NULL, 0x1000000010 },
+        { "%##lhlwlx", sizeof(ULONG), "0x10", NULL, 0x1000000010 },
         { "%04lhlwllx", sizeof(ULONG64), "1000000010", NULL, 0x1000000010 },
         { "%s", sizeof(ULONG_PTR), "str", NULL, (ULONG_PTR)"str", L"str" },
         { "%S", sizeof(ULONG_PTR), "str", NULL, (ULONG_PTR)L"str", "str" },

dlls/shlwapi/wsprintf.c

@@ -95,7 +95,7 @@ static INT WPRINTF_ParseFormatA( LPCSTR format, WPRINTF_FORMAT *res )
     res->width = 0;
     res->precision = 0;
     if (*p == '-') { res->flags |= WPRINTF_LEFTALIGN; p++; }
-    if (*p == '#') { res->flags |= WPRINTF_PREFIX_HEX; p++; }
+    while (*p == '#') { res->flags |= WPRINTF_PREFIX_HEX; p++; }
     while (*p == ' ') ++p;
     if (*p == '0') { res->flags |= WPRINTF_ZEROPAD; p++; }
     while ((*p >= '0') && (*p <= '9'))  /* width field */
@@ -192,7 +192,7 @@ static INT WPRINTF_ParseFormatW( LPCWSTR format, WPRINTF_FORMAT *res )
     res->width = 0;
     res->precision = 0;
     if (*p == '-') { res->flags |= WPRINTF_LEFTALIGN; p++; }
-    if (*p == '#') { res->flags |= WPRINTF_PREFIX_HEX; p++; }
+    while (*p == '#') { res->flags |= WPRINTF_PREFIX_HEX; p++; }
     while (*p == ' ') ++p;
     if (*p == '0') { res->flags |= WPRINTF_ZEROPAD; p++; }
     while ((*p >= '0') && (*p <= '9'))  /* width field */