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Parsing user entered commands

Posted on 2009-07-06
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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);
}
}

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Question by:wannabe_cpgeek
3 Comments
 
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Accepted Solution

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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
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Author Comment

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