+ char c, *p;
+ char buffer[100];
+ struct tm tm;
+ const char *formats[] = {
+ "%c",
+ "%a %b %d %T",
+ "%Z",
+ "%Y",
+ " %Y",
+ NULL
+ };
+ /* We only ever did two timezones in the bad old format .. */
+ const char *timezones[] = {
+ "PDT", "PST", "CEST", NULL
+ };
+ const char **fmt = formats;
+
+ p = buffer;
+ while (isspace(c = *buf))
+ buf++;
+ while ((c = *buf++) != '\n')
+ *p++ = c;
+ *p++ = 0;
+ buf = buffer;
+ memset(&tm, 0, sizeof(tm));
+ do {
+ const char *next = strptime(buf, *fmt, &tm);
+ if (next) {
+ if (!*next)
+ return mktime(&tm);
+ buf = next;
+ } else {
+ const char **p = timezones;
+ while (isspace(*buf))
+ buf++;
+ while (*p) {
+ if (!memcmp(buf, *p, strlen(*p))) {
+ buf += strlen(*p);
+ break;
+ }
+ p++;
+ }
+ }
+ fmt++;
+ } while (*buf && *fmt);
+ printf("left: %s\n", buf);
+ return mktime(&tm);
+}
+
+static int convert_date_line(char *dst, void **buf, unsigned long *sp)
+{
+ unsigned long size = *sp;
+ char *line = *buf;
+ char *next = strchr(line, '\n');
+ char *date = strchr(line, '>');
+ int len;
+
+ if (!next || !date)
+ die("missing or bad author/committer line %s", line);
+ next++; date += 2;
+
+ *buf = next;
+ *sp = size - (next - line);
+
+ len = date - line;
+ memcpy(dst, line, len);
+ dst += len;
+
+ /* Is it already in new format? */
+ if (isdigit(*date)) {
+ int datelen = next - date;
+ memcpy(dst, date, datelen);
+ return len + datelen;
+ }
+
+ /*
+ * Hacky hacky: one of the sparse old-style commits does not have
+ * any date at all, but we can fake it by using the committer date.
+ */
+ if (*date == '\n' && strchr(next, '>'))
+ date = strchr(next, '>')+2;
+
+ return len + sprintf(dst, "%lu -0700\n", parse_oldstyle_date(date));
+}
+
+static void convert_date(void *buffer, unsigned long size, unsigned char *result_sha1)
+{
+ char *new = xmalloc(size + 100);
+ unsigned long newlen = 0;
+
+ // "tree <sha1>\n"
+ memcpy(new + newlen, buffer, 46);
+ newlen += 46;
+ buffer += 46;
+ size -= 46;
+
+ // "parent <sha1>\n"
+ while (!memcmp(buffer, "parent ", 7)) {
+ memcpy(new + newlen, buffer, 48);
+ newlen += 48;
+ buffer += 48;
+ size -= 48;
+ }
+
+ // "author xyz <xyz> date"
+ newlen += convert_date_line(new + newlen, &buffer, &size);
+ // "committer xyz <xyz> date"
+ newlen += convert_date_line(new + newlen, &buffer, &size);
+
+ // Rest
+ memcpy(new + newlen, buffer, size);
+ newlen += size;
+
+ write_sha1_file(new, newlen, "commit", result_sha1);
+ free(new);
+}
+
+static void convert_commit(void *buffer, unsigned long size, unsigned char *result_sha1)
+{
+ void *orig_buffer = buffer;
+ unsigned long orig_size = size;
+