Solved

Parsing user entered commands

Posted on 2009-07-06
3
198 Views
Last Modified: 2013-12-26
Hi,
I am writing a program that takes an user input and sends it to execvp to execute. Right now I am stuck on parsing the user inputs. I think its a problem with my delimiter. if I use a different delimiter such as a comma it works fine, but I need to use a space. Take a look at tell me whats going on. Thanks.

Once I parse them how can I use each token separately? can I say pnt[0], pnt[1]? THanks
#include <stdio.h>

 

int main(int argc, char *argv[])

{

char comm[100];

char *pnt;

int i=0;

char delims[]= " ";

 

if (argc==1 ||  argc >2){

printf("Incorrect number of arguments. Exiting\n");

exit(0);

}

printf("%s ", argv[1]);

scanf("%s",&comm);

 

pnt = strtok (comm,delims);

 

while (pnt != NULL){

printf("%s\n",pnt);

pnt=strtok(NULL,delims);

}

}

Open in new window

0
Comment
Question by:wannabe_cpgeek
3 Comments
 
LVL 40

Accepted Solution

by:
mrjoltcola earned 500 total points
ID: 24790841
scanf() is only going to scan up until the first space, so  you really should use gets() to get the full line before trying to parse it.


Assuming:

red green blue


scanf("%s", ..) will scan "red" and leave the rest in the buffer (so you could call scanf again and get the next)

gets() will scan "red green blue", then you can use strtok() to parse
0
 

Author Comment

by:wannabe_cpgeek
ID: 24791052
Thanks. I figured it out.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
This article introduced a TextBox that supports transparent background.   Introduction TextBox is the most widely used control component in GUI design. Most GUI controls do not support transparent background and more or less do not have the…
The goal of this video is to provide viewers with basic examples to understand opening and writing to files in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use while-loops in the C programming language.

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

26 Experts available now in Live!

Get 1:1 Help Now