tile: Check for pointer add overflow in memchr
[glibc.git] / nis / nis_domain_of_r.c
blobe81fe45184f34e7e1cd65176f17741b81ed891ed
1 /* Copyright (c) 1997-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <errno.h>
20 #include <string.h>
21 #include <rpcsvc/nis.h>
23 nis_name
24 nis_domain_of_r (const_nis_name name, char *buffer, size_t buflen)
26 char *cptr;
27 size_t cptr_len;
29 if (buffer == NULL)
31 erange:
32 __set_errno (ERANGE);
33 return NULL;
36 buffer[0] = '\0';
38 cptr = strchr (name, '.');
40 if (cptr == NULL)
41 return buffer;
43 ++cptr;
44 cptr_len = strlen (cptr);
46 if (cptr_len == 0)
48 if (buflen < 2)
49 goto erange;
50 return strcpy (buffer, ".");
53 if (__glibc_unlikely (cptr_len >= buflen))
55 __set_errno (ERANGE);
56 return NULL;
59 return memcpy (buffer, cptr, cptr_len + 1);
61 libnsl_hidden_def (nis_domain_of_r)