1 /* tar.c - create/extract archives
8  * http://www.gnu.org/software/tar/manual/html_node/Writing-to-an-External-Program.html
10 USE_TAR(NEWTOY(tar, "&(no-recursion)(numeric-owner)(no-same-permissions)(overwrite)(exclude)*(to-co…
12 config TAR
13   bool "tar"
16     usage: tar -[cxtjzhmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR]
18     Create, extract, or list files from a tar file
126 static void write_longname(struct archive_handler *tar, char *name, char type)  in write_longname()  argument
147   writeall(tar->src_fd, (void*) &tmp, sizeof(tmp));  in write_longname()
149   writeall(tar->src_fd, name, sz);  in write_longname()
150   if (sz%512) writeall(tar->src_fd, buf, (512-(sz%512)));  in write_longname()
162 static void add_file(struct archive_handler *tar, char **nam, struct stat *st)  in add_file()  argument
206       write_longname(tar, hname, 'K'); //write longname LINK  in add_file()
224       write_longname(tar, hname, 'K'); //write longname LINK  in add_file()
239           write_longname(tar, hname, 'L'); //write longname NAME  in add_file()
253   writeall(tar->src_fd, (void*)&hdr, 512);  in add_file()
261   copy_in_out(fd, tar->src_fd, st->st_size);  in add_file()
262   if (st->st_size%512) writeall(tar->src_fd, buf, (512-(st->st_size%512)));  in add_file()
301     dup2(tar_hdl->src_fd, 1); //write to tar fd  in compress_stream()
309 static void extract_to_stdout(struct archive_handler *tar)  in extract_to_stdout()  argument
311   struct file_header *file_hdr = &tar->file_hdr;  in extract_to_stdout()
313   copy_in_out(tar->src_fd, 0, file_hdr->size);  in extract_to_stdout()
314   tar->offset += file_hdr->size;  in extract_to_stdout()
317 static void extract_to_command(struct archive_handler *tar)  in extract_to_command()  argument
321   struct file_header *file_hdr = &tar->file_hdr;  in extract_to_command()
353     copy_in_out(tar->src_fd, pipefd[1], file_hdr->size);  in extract_to_command()
354     tar->offset += file_hdr->size;  in extract_to_command()
358       xprintf("tar : %d: child returned %d\n", cpid, WTERMSIG(status));  in extract_to_command()
362 static void extract_to_disk(struct archive_handler *tar)  in extract_to_disk()  argument
367   struct file_header *file_hdr = &tar->file_hdr;  in extract_to_disk()
430   copy_in_out(tar->src_fd, dst_fd, file_hdr->size);  in extract_to_disk()
431   tar->offset += file_hdr->size;  in extract_to_disk()
532 static char *process_extended_hdr(struct archive_handler *tar, int size)  in process_extended_hdr()  argument
536   if (readall(tar->src_fd, buf, size) != size) error_exit("short read");  in process_extended_hdr()
538   tar->offset += size;  in process_extended_hdr()
567 static void tar_skip(struct archive_handler *tar, int sz)  in tar_skip()  argument
571   while ((x = lskip(tar->src_fd, sz))) {  in tar_skip()
572     tar->offset += sz - x;  in tar_skip()
575   tar->offset += sz;  in tar_skip()
580   struct tar_hdr tar;  in unpack_tar()  local
592     i = readall(tar_hdl->src_fd, &tar, 512);  in unpack_tar()
599     if (!tar.name[0]) {  in unpack_tar()
600       if (e) return; //end of tar 2 empty blocks  in unpack_tar()
604     if (strncmp(tar.magic, "ustar", 5)) {  in unpack_tar()
607       if ((!strncmp(tar.name, "\x1f\x8b", 2) || !strncmp(tar.name, "BZh", 3))  in unpack_tar()
609         toys.optflags |= (*tar.name == 'B') ? FLAG_j : FLAG_z;  in unpack_tar()
614       error_exit("invalid tar format");  in unpack_tar()
617     for (j = 0; j<148; j++) cksum += (unsigned int)((char*)&tar)[j];  in unpack_tar()
618     for (j = 156; j<500; j++) cksum += (unsigned int)((char*)&tar)[j];  in unpack_tar()
622     if (cksum != otoi(tar.chksum, sizeof(tar.chksum))) error_exit("wrong cksum");  in unpack_tar()
626     file_hdr->mode = otoi(tar.mode, sizeof(tar.mode));  in unpack_tar()
627     file_hdr->uid = otoi(tar.uid, sizeof(tar.uid));  in unpack_tar()
628     file_hdr->gid = otoi(tar.gid, sizeof(tar.gid));  in unpack_tar()
629     file_hdr->size = otoi(tar.size, sizeof(tar.size));  in unpack_tar()
630     file_hdr->mtime = otoi(tar.mtime, sizeof(tar.mtime));  in unpack_tar()
631     file_hdr->uname = xstrdup(tar.uname);  in unpack_tar()
632     file_hdr->gname = xstrdup(tar.gname);  in unpack_tar()
633     maj = otoi(tar.major, sizeof(tar.major));  in unpack_tar()
634     min = otoi(tar.minor, sizeof(tar.minor));  in unpack_tar()
637     if (tar.type <= '7') {  in unpack_tar()
638       if (tar.link[0]) {  in unpack_tar()
639         sz = sizeof(tar.link);  in unpack_tar()
641         memcpy(file_hdr->link_target, tar.link, sz);  in unpack_tar()
646       if (tar.prefix[0]) {  in unpack_tar()
647         memcpy(file_hdr->name, tar.prefix, sizeof(tar.prefix));  in unpack_tar()
652       memcpy(file_hdr->name + sz, tar.name, sizeof(tar.name));  in unpack_tar()
656     switch (tar.type) {  in unpack_tar()
795     //create the tar here.  in tar_main()