Using system() in C with an agument

Question

I wish to write a program that uses system() and compress a folder. The folder name is given via command-line. This is what I have:

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char** argv){
  int i;
  char buf[64]
  char string[]="tar -cf stent.tar ";
  if(argc>1){
    for(i=1;i<argc;i++){
      string[16]=(char)argv[i];
      printf("%s",argv[i]);
    }
  }
  snprintf(buf,sizeof(buf), "tar -cf stent.tar %s," argv);
  printf(string);
  printf(buf);
  return 0;
}

Basically I wish to do this:

system("tar -cf stent.tar %s", buf);

buf should be the input argument of the user. The folders he wants to compress

For now there is only one argument. Later i will want to split two arguments in argv in two strings — Henne, Dec 04 '17 at 21:36
Try to solve it by using [sprintf](http://www.cplusplus.com/reference/cstdio/sprintf/) — Lasoloz, Dec 04 '17 at 21:37

score 4 · Accepted Answer · answered Dec 04 '17 at 22:00

4

Perhaps this will pass the folder name argument to the tar command. But it's a mystery why you don't just do it from the command line.

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[]){
    char buf[1024];
    if(argc > 1){
        sprintf(buf, "tar -cf stent.tar %s", argv[1]);
        system(buf);
    }
    return 0;
}

Leaving the possibility of buffer overflow out of it.

answered Dec 04 '17 at 22:00

Weather Vane

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I need to do it in the programm, later i will take the compressed tar and send it over the network to another programm. But Thanks alot – Henne Dec 07 '17 at 19:11

Using system() in C with an agument

1 Answers1