SIGN_EXTEND_CHAR  231 libglibc/regex.c #undef SIGN_EXTEND_CHAR
SIGN_EXTEND_CHAR  233 libglibc/regex.c # define SIGN_EXTEND_CHAR(c) ((signed char) (c))
SIGN_EXTEND_CHAR  236 libglibc/regex.c # define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128)