Linux ls command

RichieMac

I'm trying to rewrite the ls command for a small project. I don't really know where to begin so any help would be gratefully received.
Many thanx!

job4cse

: I'm trying to rewrite the ls command for a small project. I don't really know where to begin so any help would be gratefully received.
: Many thanx!
:

Hi,
U can use the following code. This program opens the directory specified on the command line and list the entries recursively.




#include
#include
#include
#include
#include

static char wd[128];

void rec_open( char *dname, int lev )
{
struct dirent *dbuf;
DIR *dp;
struct stat stbuf;
char cwd[128];
int i = strlen( dname );

if (i > 1 && dname[i - 1] == '/')
dname[i - 1] = 0;

getcwd( cwd, sizeof (cwd) );
// printf( "CWD = %s
", cwd );


dp = opendir( dname );
if (dp == NULL) {
write( 1, "opendir ", 8 );
perror( dname );
return;
}

if (chdir( dname ) < 0) {
write( 1, "chdir ", 6 );
perror( dname );
return;
}

while ((dbuf = readdir( dp ))) {
if (! strcmp( dbuf->d_name, "." ) || ! strcmp( dbuf->d_name, ".." ))
continue;

for (i = 0; i < lev; ++i)
printf( " |" );

if (stat( dbuf->d_name, &stbuf ) < 0) {
write( 1, "stat ", 5 );
perror( dbuf->d_name );
continue;
}
switch (stbuf.st_mode & S_IFMT) {
case S_IFREG:
printf( "--%s
", dbuf->d_name );
break;
case S_IFDIR:
printf( "33[01;34m--%s 33[0m
", dbuf->d_name ); //Display in Blue color
rec_open( dbuf->d_name, lev + 1 );
break;
default:
printf( "
" );
}
}
closedir( dp );
chdir( cwd );
}

int main(int argc, char *argv[])
{
if (argc < 2)
rec_open( ".", 1 );
else
rec_open( argv[1], 1 );
return 0;
}

rbrowning

What is the point of

while ((dbuf = readdir( dp ))) {
if (! strcmp( dbuf->d_name, "." ) || ! strcmp( dbuf->d_name, ".." ))
continue;

The bit comparing "." with ".."?

I'm working to write a small project doing the same command, but with the parameters -lR.

Thanks