Parser bug with files larger than BUFSIZ

[JakobR]

There seems to be a bug in the S-expression parser. When the file to be read is larger than BUFSIZ bytes (which is 1024 on my system), I get the error SEXP_ERR_INCOMPLETE (in the sexp_errno variable).

I don't know how to properly fix it, but adding the lines

#undef BUFSIZ
#define	BUFSIZ	10240

after the includes in sexp.h makes the error disappear for my larger file.