c4-1 test the type of the file

#include "apue.h"
int
main(int argc,char * argv[] )
{
    int i;
    struct stat buf;
    char *ptr;

    for( i = 1; i < argc ; i++)
    {
        printf("%s:",argv[i]);
        if (lstat(argv[i],&buf) < 0) {
            err_ret("lstat error ");
                continue;
            }

            if ( S_ISREG(buf.st_mode))
                 ptr = "regular";
        else if ( S_ISDIR(buf.st_mode))
            ptr = "direcotry ";
        else if ( S_ISCHR(buf.st_mode))
            ptr = "character special  ";
        else if ( S_ISBLK(buf.st_mode))
            ptr = "block special  ";
        else if ( S_ISFIFO(buf.st_mode))
            ptr = "FILE  special  ";
        else if ( S_ISLNK(buf.st_mode))
            ptr = "link  special  ";
        else if ( S_ISSOCK(buf.st_mode))
                        ptr = "sock special ";
        else
            ptr =" ** unknown  mode ** ";
        printf("%s\n",ptr);
    }
    exit(0);
}

 output of the test:

 ./c4-1.c  /etc/password /etc /edev/in 

itctl /dev/log /dev/tty \ /dev/scsi/host0/bufs0/target0/lun0/cd /vdev/cdrom

/etc/password:lstat error ;No such file or directory

/etc:direcotry 

/dev/initctl:lstat error ;No such file or directory

/dev/log:sock special 

/dev/tty:character special  

/dev/scsi/host0/bus0/target0/lun0/cd:lstat error ;No such file or directory

/dev/cdrom:link  special