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/***
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 "alternative.h"
#include "malloc.h"
#include "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) {
char label[AVAHI_LABEL_MAX], alternative[AVAHI_LABEL_MAX*4+1];
char *alt, *r, *ret;
const char *e;
size_t len;
assert(s);
if (!avahi_is_valid_host_name(s))
return NULL;
if (!avahi_unescape_label(&s, label, sizeof(label)))
return NULL;
if ((e = strrchr(label, '-'))) {
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;
int n;
n = atoi(e)+1;
if (!(m = avahi_strdup_printf("%i", n)))
return NULL;
len = e-label-1;
if (len >= AVAHI_LABEL_MAX-1-strlen(m)-1)
len = AVAHI_LABEL_MAX-1-strlen(m)-1;
if (!(c = avahi_strndup(label, len))) {
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(label, AVAHI_LABEL_MAX-1-2)))
return NULL;
drop_incomplete_utf8(c);
r = avahi_strdup_printf("%s-2", c);
avahi_free(c);
}
alt = alternative;
len = sizeof(alternative);
ret = avahi_escape_label(r, strlen(r), &alt, &len);
avahi_free(r);
r = avahi_strdup(ret);
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;
}
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