Detect "Exit" as first word

Hi im making a shell program that reads a line of input from the user, then if "cont" is detected as the first word of the line inputted, the line will be tokenized.

here's my main code

Code:

---

main ()
{
char line [ MAXLINE ], * words [ MAXWORDS ], message [ MAXLINE ];
int stop =0 , nwords =0;
while (1)
{
printf (" Enter line: " );
if ( NULL == fgets ( line , MAXLINE , stdin ))
return 0;
tokenize ( line , words ,& nwords );
}
}

---

here is my tokenize code:

Code:

---

void tokenize ( char * line , char ** words , int * nwords )
{
        * nwords =1;
        for ( words [0]= strtok ( line , " \t\n" );
            (*nwords < MAXWORDS )&&( words[*nwords ]= strtok ( NULL , " \t\n" ));
            * nwords =* nwords +1);
        return ;
}

---

I'm not sure how to detect if "cont" is appeared as first word of the line, then tokenize the line.

Grab the first word with sscanf and use strcmp to see if it is what you want it to be.


Quzah.

Quote:

---

Originally Posted by quzah

Grab the first word with sscanf and use strcmp to see if it is what you want it to be.


Quzah.

---

thanks for the reply. I added the sscanf :

Code:

---

main ()
{
        char line [ MAX_LINE ] , * words [ MAX_WORDS ] , message [ MAX_LINE ];
        int stop =0 , nwords =0;
    int i;
       
        while (1)
        {
                printf ( " Enter line:" );
                if ( NULL == fgets ( line , MAX_LINE , stdin ))
                        return 0;
                tokenize ( line , words ,& nwords );
                sscanf(words, "cont", i);
}
}

---

I'm not sure if i did it correctly, and how do i use strcmp to compare the words so that when "cont" is appeared as first word, tokenization will then take place?

Have you ever actually used scanf before? What is it you think you are storing here:

Code:

---

sscanf(words, "cont", i);

---

You should read the man page (click that) if you aren't sure how it works. Do the same for strcmp.


Quzah.

Quote:

---

Originally Posted by quzah

Have you ever actually used scanf before? What is it you think you are storing here:

Code:

---

sscanf(words, "cont", i);

---

You should read the man page (click that) if you aren't sure how it works. Do the same for strcmp.


Quzah.

---

Hi thanks again for the reply. I never used scanf before. It's also the first time I've ever program with C using Linux, I used to do C++ programming in Windows but I found out they are quite different.
I'll have a look at the website you gave me. Thanks again!

I now need to use fork() and Use one of the exec() family to run the program requested which is the Inputting and tokenizing lines I wrote above. But I'm not sure how to put the code into the exec function so that it runs the program. I have no problem making the fork(), it's just the child process that contains exec I'm havin problem with.