errors when there is a bit literal in ecpg

Hi, hacker

I met an error as below when I use ecpg

a.pgc:5: ERROR: invalid bit string literal
a.pgc:5: ERROR: internal error: unreachable state; please report this to <pgsql-bugs(at)lists(dot)postgresql(dot)org>

the test source is attached.

After investigating the code, I think the process of pgc.l is:
Step 1: <SQL>{xbstart}, addlitchar('b') is called, literalbuf contains a char 'b';
Step 2: <xb>{xbinside}, the rest of char is added in literalbuf
Step 3: <xqs>{other}, the condition literalbuf[strspn(literalbuf, "01") + 1] != '\0' will always be true;
error is occurred here

I try to fix this bug by deleting 'addlitchar('b');' from source I also add a test case to test all const str in ecpg.

The patch is also attached.

Best regards, Shenhao Wang