Add "Add New ID" button

zet.dpi.c

@@ -36,6 +36,7 @@ static const int max_cols = 54;
 static char server_hostname[256];
 static char server_url[256];
 static char zet_dir[_POSIX_PATH_MAX-64];
+static bool seeded = false;
 
 enum http_method {
 	HTTP_METHOD_GET,
@@ -58,6 +59,7 @@ struct http_request {
 	int fd;
 	char *data, *full_data;
 	size_t len;
+	bool add_new_id;
 };
 
 struct zet_search {
@@ -822,6 +824,7 @@ static int dpi_serve_zet(int fd, char *path) {
 	if (rc < 0) { warnx("passthrough_note_html"); close(fd); return 0; }
 	rc = dprintf(fd, "</textarea><br>"
 		"<input type=submit value=\"Save\">"
+		" <input type=submit name=add_new_id value=\"Add New ID\">"
 		"</form></td>"
 		"<style>pre { white-space: pre-wrap; }</style>"
 		"<td>"
@@ -954,8 +957,21 @@ static int http_serve_index(struct http_request *req) {
 	return 0;
 }
 
+static void generate_id(char id[64]) {
+	if (!seeded) {
+		srandom(time(NULL) ^ getpid());
+		seeded = true;
+	}
+	(void)snprintf(id, 64, "%08lx%08lx", random(), random());
+}
+
 static int save_part(struct http_request *req, int note_fd) {
 	int rc = write_all(note_fd, (unsigned char *)req->data, req->len);
+	if (req->add_new_id) {
+		char id[72] = "\n§";
+		generate_id(id + 1 + sigil_size);
+		rc |= write_all(note_fd, id, strlen(id));
+	}
 	rc |= close(note_fd);
 	free(req->full_data);
 	return rc;
@@ -1018,6 +1034,8 @@ static int parse_multipart(struct http_request *req) {
 		if (!strcmp(name, "text")) {
 			req->data = body;
 			req->len = end == NULL ? strlen(body) : (size_t)end - (size_t)body;
+		} else if (!strcmp(name, "add_new_id")) {
+			req->add_new_id = true;
 		}
 	}
 	return 0;
@@ -1040,8 +1058,7 @@ static int http_serve_new(struct http_request *req) {
 
 	(void)mkdir(zet_dir, 0700);
 
-	srandom(time(NULL) ^ getpid());
-	(void)snprintf(id, sizeof(id), "%08lx%08lx", random(), random());
+	generate_id(id);
 	(void)snprintf(note_path, sizeof(note_path), "%s/%s", zet_dir, id);
 	int note_fd = open(note_path, O_CREAT|O_WRONLY|O_TRUNC, 0640);
 	if (note_fd < 0) {
@@ -1175,6 +1192,7 @@ static int handle_http_client(int fd, int firstchar) {
 	req.content_length = -1;
 	req.content_type = NULL;
 	req.multipart_boundary = NULL;
+	req.add_new_id = false;
 
 	char *line = nextline;
 	while (line != NULL) {