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stimulate ls -l

Posted on 2011-03-04

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Last Modified: 2012-06-21

Hi. If anyone can help me with ls –l I appreciate that. I've written program in c to stimulate ls -l.
it's works well except the link. I need to print out the line like this
lrwxrwxrwx 1 admin admin 11 Feb 27 19:08 figC.18 -> ipc/fifo1.c.
but it’s just print lrwxrwxrwx 1 admin admin 11 Feb 27 19:08 figC.18. I need to make my program print the link also.
Thanks for your help

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Question by:eng_h

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5 Comments

LVL 32

Expert Comment

by:phoffric

ID: 350420022011-03-04

You saw http://www.experts-exchange.com/Programming/Languages/C/Q_20416430.html , right?

Also, look at http://www.ibm.com/developerworks/aix/library/au-unix-readdir.html :

•S_ISBLK(mode) -- Is this a block special file? (usually a block-based device of some sort)
•S_ISCHR(mode) -- Is this a character special file? (again, usually a character-based device of some sort)
•S_ISDIR(mode) -- Is this a directory?
•S_ISFIFO(mode) -- Is this a pipe or FIFO special file?
•S_ISLNK(mode) -- Is this a symbolic link?
•S_ISREG(mode) -- Is this a regular file?

LVL 32

Accepted Solution

by:phoffric

phoffric earned 2000 total points

ID: 350420072011-03-04

Also, in http://www.ibm.com/developerworks/aix/library/au-unix-readdir.html is verifcation code that link is valid:

Listing 5. Process the entry

(void)strncpy( pathName, theDir, PATH_MAX );
        (void)strncat( pathName, "/", PATH_MAX );
        (void)strncat( pathName, entry.d_name, PATH_MAX );
        
        if( lstat( pathName, &entryInfo ) == 0 ) {
            /* stat() succeeded, let's party */
            count++;
            
            if( S_ISDIR( entryInfo.st_mode ) ) {            
/* directory */
                printf( "processing %s/\n", pathName );
                count += process_directory( pathName );
            } else if( S_ISREG( entryInfo.st_mode ) ) { 
/* regular file */
                printf( "\t%s has %lld bytes\n",
                    pathName, (long long)entryInfo.st_size );
            } else if( S_ISLNK( entryInfo.st_mode ) ) { 
/* symbolic link */
                char targetName[PATH_MAX + 1];
                if( readlink( pathName, targetName, PATH_MAX ) != -1 ) {
                    printf( "\t%s -> %s\n", pathName, targetName );
                } else {
                    printf( "\t%s -> (invalid symbolic link!)\n",
 pathName );
                }
            }
        } else {
            printf( "Error statting %s: %s\n", pathName, strerror( 
errno ) );
        }

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Author Closing Comment

by:eng_h

ID: 350445222011-03-05

The solution was so helpful.

Author Comment

by:eng_h

ID: 350445442011-03-05

I used this part in my program
char targetName[PATH_MAX + 1];
if( readlink( pathName, targetName, PATH_MAX ) != -1 )
{
printf( "\t%s -> %s\n", pathName, targetName );
}
else
printf( "\t%s -> (invalid symbolic link!)\n", pathName );
and it worked with me.
Thanks so much for your time phoffric !!

LVL 32

Expert Comment

by:phoffric

ID: 350449882011-03-05

Glad you found it helpful.

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