+ unsigned char subdir_sha1[20];
+ unsigned long size, offset;
+ char *buffer;
+ int nr;
+
+ /* Guess at some random initial size */
+ size = 8192;
+ buffer = xmalloc(size);
+ offset = 0;
+
+ nr = 0;
+ while (nr < maxentries) {
+ struct cache_entry *ce = cachep[nr];
+ const char *pathname = ce->name, *filename, *dirname;
+ int pathlen = ce_namelen(ce), entrylen;
+ unsigned char *sha1;
+ unsigned int mode;
+
+ /* Did we hit the end of the directory? Return how many we wrote */
+ if (baselen >= pathlen || memcmp(base, pathname, baselen))
+ break;
+
+ sha1 = ce->sha1;
+ mode = ntohl(ce->ce_mode);
+
+ /* Do we have _further_ subdirectories? */
+ filename = pathname + baselen;
+ dirname = strchr(filename, '/');
+ if (dirname) {
+ int subdir_written;
+
+ subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
+ nr += subdir_written;
+
+ /* Now we need to write out the directory entry into this tree.. */
+ mode = S_IFDIR;
+ pathlen = dirname - pathname;
+
+ /* ..but the directory entry doesn't count towards the total count */
+ nr--;
+ sha1 = subdir_sha1;
+ }
+
+ if (!missing_ok && check_valid_sha1(sha1) < 0)
+ exit(1);
+
+ entrylen = pathlen - baselen;
+ if (offset + entrylen + 100 > size) {
+ size = alloc_nr(offset + entrylen + 100);
+ buffer = xrealloc(buffer, size);
+ }
+ offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
+ buffer[offset++] = 0;
+ memcpy(buffer + offset, sha1, 20);
+ offset += 20;
+ nr++;
+ }
+
+ write_sha1_file(buffer, offset, "tree", returnsha1);
+ free(buffer);
+ return nr;