- /* insert the header and add the '\n' if needed: */
- max_size = header_len + size + (sign ? MAX_SIGNATURE_LENGTH : 0) + 1;
- buffer = xrealloc(buffer, max_size);
- if (size)
- buffer[size++] = '\n';
- memmove(buffer + header_len, buffer, size);
- memcpy(buffer, header_buf, header_len);
- size += header_len;
-
- if (sign) {
- size = do_sign(buffer, size, max_size);
- if (size < 0)
- die("unable to sign the tag");
- }
+ strbuf_insert(buf, 0, header_buf, header_len);