Question

I have got my strtok working, but now because I am using scanf which ends the string with NULL char my program is only grabbing one line from redirected standard in. eg.

scanf("%s" , input);
    token = strtok (input, ", \n");

    while(token != NULL){
            i += (strtol(token,0,0)); 
            token = strtok(NULL, ", \n"); 

    }

So I am trying to use functions to check if the program has reached just a NULL of a EOF (from what i understand EOF = -1 NULL = 0) but I’m having trouble getting the pointers and functions to work in my code. P.S. I know it’s crappy code, but it’s late and I’m still working on it while I wait for suggestions to point out my obvious errors that I’m missing.

int scanner();
int check_EOF();
int next_line(char *token);
int main(){

char *token, input[256];
int i = 0;


scanf("%s" , input);
    token = strtok (input, ", \n");

    if (!scanner())
        check_EOF();

printf("%d\n", i);
return 0;
}


int check_EOF(){
while(token !=EOF);
    next_line();
 }

int next_line(){
while(token != NULL){
    return 1;
else return 0;   
}

int scanner(){
while(next_line()){
        i += (strtol(token,0,0));
        token = strtok(NULL, ",")

    return 0
}

Is there an easier way that I don’t know about or am I heading in the right direction with lots of errors?

Thanks, Lachlan

Answer 1

From man scanf:

 The  value  EOF is returned if the end of input is reached...

You just need to check the return value of scanf, not strtok. Something like:

while(scanf("%s", input) != EOF)
   //just do it