mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Compare two binary domain names for quality.
|
|
Copyright (C) 2022-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library 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.
|
|
|
|
The GNU C Library 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 the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <arpa/nameser.h>
|
|
#include <stdbool.h>
|
|
|
|
/* Convert ASCII letters to upper case. */
|
|
static inline int
|
|
ascii_toupper (unsigned char ch)
|
|
{
|
|
if (ch >= 'a' && ch <= 'z')
|
|
return ch - 'a' + 'A';
|
|
else
|
|
return ch;
|
|
}
|
|
|
|
bool
|
|
__ns_samebinaryname (const unsigned char *a, const unsigned char *b)
|
|
{
|
|
while (*a != 0 && *b != 0)
|
|
{
|
|
if (*a != *b)
|
|
/* Different label length. */
|
|
return false;
|
|
int labellen = *a;
|
|
++a;
|
|
++b;
|
|
for (int i = 0; i < labellen; ++i)
|
|
{
|
|
if (*a != *b && ascii_toupper (*a) != ascii_toupper (*b))
|
|
/* Different character in label. */
|
|
return false;
|
|
++a;
|
|
++b;
|
|
}
|
|
}
|
|
|
|
/* Match if both names are at the root label. */
|
|
return *a == 0 && *b == 0;
|
|
}
|