--- /dev/null
+/***
+ This file is part of avahi.
+
+ avahi is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ avahi is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with avahi; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include <avahi/alternative.h>
+#include <avahi/malloc.h>
+#include <avahi/domain.h>
+#include "utf8.h"
+
+static void drop_incomplete_utf8(char *c) {
+ char *e;
+
+ e = strchr(c, 0) - 1;
+
+ while (e >= c) {
+
+ if (avahi_utf8_valid(c))
+ break;
+
+ assert(*e & 128);
+ *e = 0;
+
+ e--;
+ }
+}
+
+char *avahi_alternative_host_name(const char *s) {
+ const char *e;
+ char *r;
+
+ assert(s);
+
+ if (!avahi_is_valid_host_name(s))
+ return NULL;
+
+ if ((e = strrchr(s, '-'))) {
+ const char *p;
+
+ e++;
+
+ for (p = e; *p; p++)
+ if (!isdigit(*p)) {
+ e = NULL;
+ break;
+ }
+
+ if (e && (*e == '0' || *e == 0))
+ e = NULL;
+ }
+
+ if (e) {
+ char *c, *m;
+ size_t l;
+ int n;
+
+ n = atoi(e)+1;
+ if (!(m = avahi_strdup_printf("%i", n)))
+ return NULL;
+
+ l = e-s-1;
+
+ if (l >= AVAHI_LABEL_MAX-1-strlen(m)-1)
+ l = AVAHI_LABEL_MAX-1-strlen(m)-1;
+
+ if (!(c = avahi_strndup(s, l))) {
+ avahi_free(m);
+ return NULL;
+ }
+
+ drop_incomplete_utf8(c);
+
+ r = avahi_strdup_printf("%s-%s", c, m);
+ avahi_free(c);
+ avahi_free(m);
+
+ } else {
+ char *c;
+
+ if (!(c = avahi_strndup(s, AVAHI_LABEL_MAX-1-2)))
+ return NULL;
+
+ drop_incomplete_utf8(c);
+
+ r = avahi_strdup_printf("%s-2", c);
+ avahi_free(c);
+ }
+
+ assert(avahi_is_valid_host_name(r));
+
+ return r;
+}
+
+char *avahi_alternative_service_name(const char *s) {
+ const char *e;
+ char *r;
+
+ assert(s);
+
+ if (!avahi_is_valid_service_name(s))
+ return NULL;
+
+ if ((e = strstr(s, " #"))) {
+ const char *n, *p;
+ e += 2;
+
+ while ((n = strstr(e, " #")))
+ e = n + 2;
+
+ for (p = e; *p; p++)
+ if (!isdigit(*p)) {
+ e = NULL;
+ break;
+ }
+
+ if (e && (*e == '0' || *e == 0))
+ e = NULL;
+ }
+
+ if (e) {
+ char *c, *m;
+ size_t l;
+ int n;
+
+ n = atoi(e)+1;
+ if (!(m = avahi_strdup_printf("%i", n)))
+ return NULL;
+
+ l = e-s-2;
+
+ if (l >= AVAHI_LABEL_MAX-1-strlen(m)-2)
+ l = AVAHI_LABEL_MAX-1-strlen(m)-2;
+
+ if (!(c = avahi_strndup(s, l))) {
+ avahi_free(m);
+ return NULL;
+ }
+
+ drop_incomplete_utf8(c);
+
+ r = avahi_strdup_printf("%s #%s", c, m);
+ avahi_free(c);
+ avahi_free(m);
+ } else {
+ char *c;
+
+ if (!(c = avahi_strndup(s, AVAHI_LABEL_MAX-1-3)))
+ return NULL;
+
+ drop_incomplete_utf8(c);
+
+ r = avahi_strdup_printf("%s #2", c);
+ avahi_free(c);
+ }
+
+ assert(avahi_is_valid_service_name(r));
+
+ return r;
+}