/* my_mkdir.c 
   get the name of a directory to create
        usage:  my_mkdir newdirectoryname
   to compile:
        gcc -o my_mkdir my_mkdir.c
        chmod +x my_mkdir   -- if the file isn't already executable
*/

#include <stdlib.h>
#include <string.h>
#define zout(z) memset(&z,0x00,sizeof(z))
void help(void);
int main(int argc, char *argv[]){
    int retval=0;
    char commandline[256];
    if(argc <2 || argc > 3) help();      /* the user typed the wrong number of arguments */
    					/* assume that argv[1] is the name of 
    					                        the directory to create */
    zout(commandline); 			/* set all characters in commandline to ASCII 0 */
    strcpy(commandline,"mkdir ");  	/* copy the work mkdir to the start of the command */
    strcat(commandline,argv[1]); 	/* add the directory name */
    retval=system(commandline); 	/* execute the command */
    if(retval){  			/* check to see if it worked */
          printf("Command: %s failed.\n",commandline); /* we bombed */
          return 1;  			/* return failure */
    }
    printf("Command: %s succeeded.\n",commandline); /* we did okay */
    return 0;  				/* return success */
    
}

void help(void){  			/* give the user some help and then return an error */
     printf("Invalid number of arguments\n");
     printf("Usage:  my_mkdir <directory name> \n");
     exit(EXIT_FAILURE);
}