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

#define PUTS(desc) do {           \
    printf(desc);                 \
    fwrite(ts, 1, te-ts, stdout); \
    printf("\n");                 \
} while(0)

%%{
    machine Word;

    main := |*
        'a' {PUTS("a: ");};
        [ab]+ . 'c' {PUTS("abc: ");};
        any;
    *|;
}%%

%% write data nofinal;

void scan(char *buf, int len)
{
    int cs, act;
    char *ts, *te = 0;

    %% write init;

    char *p = buf;
    char *pe = buf + len;
    char *eof = pe;

    %% write exec;

    if ( cs == Word_error ) {
        fprintf(stderr, "PARSE ERROR\n" );
        return;
    }

    if ( ts ) {
        // There is stuff left
        fprintf(stderr, "STUFF LEFT: '%s'\n", ts);
    }
}

int main(int argc, char **argv)
{
    if (argc != 2) {
        printf("Usage: %s 'ba a'\n", argv[0]);
        exit(-1);
    }

    scan(argv[1], strlen(argv[1]));
    return 0;
}