Change Details

If we are in single-byte locale, characters 128-255 will be negative for char type, and character&BACKSL would incorrectly produce 'true'; cast the character we want to test to unsigned char. While here, use proper iswalpha() for wint_t argument. PR: 264275, 274032 Fixes: adeebf4cd47c ("regex(3): Interpret many escaped ordinary...")

Characters 128-255 (typically those from single byte locales) will be negative for char type, and character&BACKSL would incorrectly produce 'true'; cast the character we want to test to unsigned char. While here, use proper iswalpha() for wint_t argument. PR: 264275, 274032 Fixes: adeebf4cd47c ("regex(3): Interpret many escaped ordinary...")

If we are in single-byte locale, characters 128-255Characters 128-255 (typically those from single byte locales) will be negative for char type, and character&BACKSL would incorrectly produce 'true'; cast the character we want to test to unsigned char. While here, use proper iswalpha() for wint_t argument. PR: 264275, 274032 Fixes: adeebf4cd47c ("regex(3): Interpret many escaped ordinary...")