+
+static size_t
+split_long_name (const char *name, size_t length)
+{
+ size_t i;
+
+ if (length > PREFIX_FIELD_SIZE)
+ length = PREFIX_FIELD_SIZE+2;
+ for (i = length - 1; i > 0; i--)
+ if (ISSLASH (name[i]))
+ break;
+ return i;
+}
+
+static union block *
+write_ustar_long_name (const char *name)
+{
+ size_t length = strlen (name);
+ size_t i;
+ union block *header;
+
+ if (length > PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1)
+ {
+ WARN ((0, 0, _("%s: file name is too long (max %d); not dumped"),
+ quotearg_colon (name),
+ PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1));
+ return NULL;
+ }
+
+ i = split_long_name (name, length);
+ if (i == 0)
+ {
+ WARN ((0, 0,
+ _("%s: file name is too long (cannot be split); not dumped"),
+ quotearg_colon (name),
+ PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1));
+ return NULL;
+ }
+
+ header = find_next_block ();
+ memset (header->buffer, 0, sizeof (header->buffer));
+ memcpy (header->header.prefix, name, i);
+ memcpy (header->header.name, name + i + 1, length - i);
+
+ return header;
+}
+
+/* Write a long link name, depending on the current archive format */
+static void
+write_long_link (struct tar_stat_info *st)
+{
+ switch (archive_format)
+ {
+ case POSIX_FORMAT:
+ xheader_store ("linkpath", st);
+ break;
+
+ case V7_FORMAT: /* old V7 tar format */
+ case USTAR_FORMAT:
+ case STAR_FORMAT:
+ WARN ((0, 0,
+ _("%s: link name is too long; not dumped"),
+ quotearg_colon (st->link_name)));
+ break;
+
+ case OLDGNU_FORMAT:
+ case GNU_FORMAT:
+ write_gnu_long_link (st->link_name, GNUTYPE_LONGLINK);
+ break;
+
+ default:
+ abort(); /*FIXME*/
+ }
+}
+
+static union block *
+write_long_name (struct tar_stat_info *st)
+{
+ switch (archive_format)
+ {
+ case POSIX_FORMAT:
+ xheader_store ("path", st);
+ break;
+
+ case V7_FORMAT:
+ case USTAR_FORMAT:
+ case STAR_FORMAT:
+ return write_ustar_long_name (st->file_name);
+
+ case OLDGNU_FORMAT:
+ case GNU_FORMAT:
+ write_gnu_long_link (st->file_name, GNUTYPE_LONGNAME);
+ break;
+
+ default:
+ abort(); /*FIXME*/
+ }
+ return write_short_name (st);
+}
+
+static union block *
+write_extended (union block *old_header, char type)
+{
+ union block *header, hp;
+ struct tar_stat_info foo;
+ size_t size;
+ char *p;
+
+ if (extended_header.buffer || extended_header.stk == NULL)
+ return old_header;
+
+ xheader_finish (&extended_header);
+ size = extended_header.size;
+
+ memcpy (hp.buffer, old_header, sizeof (hp));
+
+ header = start_private_header ("././@PaxHeader", size);
+ header->header.typeflag = type;
+
+ finish_header (header, -1);
+
+ p = extended_header.buffer;
+
+ do
+ {
+ size_t len;
+
+ header = find_next_block ();
+ len = BLOCKSIZE;
+ if (len > size)
+ len = size;
+ memcpy (header->buffer, p, len);
+ if (len < BLOCKSIZE)
+ memset (header->buffer + len, 0, BLOCKSIZE - len);
+ p += len;
+ size -= len;
+ set_next_block_after (header);
+ }
+ while (size > 0);
+
+ xheader_destroy (&extended_header);
+ header = find_next_block ();
+ memcpy (header, &hp.buffer, sizeof (hp.buffer));
+ return header;
+}
+
+static union block *
+write_header_name (struct tar_stat_info *st)
+{
+ if (NAME_FIELD_SIZE <= strlen (st->file_name))
+ return write_long_name (st);
+ else
+ return write_short_name (st);
+}
+