Space issue with Flex/Bison

Answer 1

It appears as though you are not returning anything on this line:

[ \t]+     { context = strdup(yytext); fwrite(context, sizeof(char), strlen(context), yyout); }

Without returning anything, it doesn't seem as though it would be recognized as a token, and thus would be ignored.

I'm not 100% sure however. I'm a little confused by your use of the variable "context" (which also seems to be a valid token?), but at any rate that may be your problem.