Catalogue and subcatalog files

[Kadyn]

We need to find all the files on the catalogue and all the subcategories and copy the Dir catalogue.

How do you do that?

[jules]

For reading catalogues in standard library C, there are functions described in the headline file dirent.h♪ The next fragment makes one catalogue look.

#include <dirent.h>
...
DIR *dp;
struct dirent *ep;

dp = opendir(path);
if (!dp) {
    /* Ошибка открытия, возможно нет прав, или это не каталог, или что-то ещё, можно уточнить через errno */
   ...
}
while ((ep = readdir(dp))) {
    if (!strcmp(ep-&gt;d_name, "..") || !strcmp(ep-&gt;d_name, ".")) continue;
    /* делаем с именем что-то дальше */
    ...
}
closedir(dp);

Before copying, it is worth checking on different situations, for example, if the appointment file already exists and this is a reference to the original file, or if the original file is a device, fifo is a file, a juice or a symbolic reference.

All these checks make the Utilities. cpbut with a surround, she's digging a tree of catalogues into a tree, not one catalogue. If you want to write a copy on your own, you need to get a look at it. http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=blob;f=src/cp.c;h=8fb5e444fbaf529c19b3d9ff92c3928302e39118;hb=master or with a simpler option https://busybox.net/source.html ♪

The same can be done with a utilitate tour. find♪