unix `ls' command in C program

Hi all,

I want to run C program as follow:

./commands filepath -l

Code:

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

int main(int argc, char *argv[])
{
char cmdline[] = "ls "; 
strcat(cmdline,argv[1]); // to accept filepath
strcat(cmdline,argv[2]); // to accept -l
system(cmdline);
return 0;
}

first problem:
I recieved "Segmentation fault (core dumped)" for ./commands filepath
second problem:
When I passed `l': ./commands filepath -l
I recived:
ls: filepath/stuff-l: No such file or directory
Segmentation fault (core dumped)
So, it accepted filepath/stuff-l as one string

Thankx in advance

Make cmdline a big enough array to be able to concatenate to it.

Code:

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

int main(int argc, char *argv[])
{
   char cmdline[100]; 
   if ( argc > 2 )
   {
      sprintf(cmdline, "ls %s %s", argv[1], argv[2]);
      system(cmdline);
   }
   return 0;
}

However, I need to know what is wrong in my code. I tried to make the "cmdline" big enough but failed.
Is the problem with strcat() function?

Code:

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

int main(int argc, char *argv[])
{
   char cmdline[100] = "ls "; 
   strcat(cmdline,argv[1]); // to accept filepath
   strcat(cmdline," ");
   strcat(cmdline,argv[2]); // to accept -l
   printf("cmdline = \"%s\"\n", cmdline); /* debug */
   system(cmdline);
   return 0;
}

/* my output
H:\test>test filepath -l
cmdline = "ls filepath -l"
*/