Flex+Cygwin --> Error: Exception: STATUS_ACCESS_VIOLATION

[Matilla]

 Hi people

I'm trying to develop a scanner using flex+cygwin, it's just a silly scanner what i want to do is to store every yytext in a char **tokens vector. And after generate the lex.yy.c and compile it. The result of the execution is an error:

4 [main] test 3616 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
924 [main] test 3616 open_stackdumpfile: Dumping stack trace to test.exe.sta
ckdump


Anybody can help me, please?

This is the .y file:

// Begin File //

%{ 
  #include <stdlib.h> /* need this for the call to malloc(), free() */
  #include <string.h> /* need this for the call to strcpy() */
%}

/* Global variables needed in the program */
    char **tokens = NULL;
    int tokensIndex = 0;
%%

. {
    if ((tokens[tokensIndex] = strdup(yytext)) != NULL) {
            tokensIndex++;
    } else {
        printf("ERROR: While duplicating memory from yytext.\n");
        exit(1);
    }
}

%%

int main(int argc, char ** argv ) {
    ++argv, --argc;  /* skip over program name */
    if ( argc > 0 ) {
        yyin = fopen( argv[0], "r" );
    } else {
        exit(1);
    }
   
    /* Store the tokens in variable char **tokens */
    yylex();
   
    /* Print all the tokens propertly*/
    int i = 0;
    for(;i<tokensIndex;i++) {
        printf("%s\n",tokens[i]);
        free(tokens[i]);
    }
}

// End File //

Thanks a lot, for your answers.

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