Set errno in vaswprintf in case vswprintf does not
As is the case on GNU.
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							| @ -75,6 +75,7 @@ int vaswprintf(wchar_t **ret, const wchar_t *format, va_list ap) { | |||||||
| 
 | 
 | ||||||
| 		va_list _ap; | 		va_list _ap; | ||||||
| 		va_copy(_ap, ap); | 		va_copy(_ap, ap); | ||||||
|  | 		errno = EOVERFLOW; // vswprintf may not set errno.
 | ||||||
| 		int len = vswprintf(*ret, 1 + cap, format, _ap); | 		int len = vswprintf(*ret, 1 + cap, format, _ap); | ||||||
| 		va_end(_ap); | 		va_end(_ap); | ||||||
| 
 | 
 | ||||||
|  | |||||||
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