Local error operator

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

%%{
        machine test;
        write data;
}%%

void parse( char *str )
{
        char *p = str, *pe = str + strlen( str );
        int cs;
        char* eof = 0;

        %%{
                action parse_error { printf("parse error\n"); }

                main = ('HELLO ' $^parse_error) 'WORLD' any*;

                write init;
                write exec;
        }%%

        printf("read: ");
        fwrite(str, 1, p - str, stdout);
        if (p <= str || *(p-1) != '\n') {
                putc('\n', stdout);
        }
        printf("len: %d, state: %d\n", p - str, cs);
}



#define BUFSIZE 100024

int main()
{
        char buf[BUFSIZE];
        while ( fgets( buf, sizeof(buf), stdin ) != 0 ) {
                parse( buf );
        }
        return 0;
}