1 /* Copyright (C) 1992, 93, 96, 97, 98, 99 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
18
19 #include "mydnsutil.h"
20
21 #if !HAVE_STRSEP
22
23 char *
strsep(char ** stringp,const char * delim)24 strsep (char **stringp, const char *delim)
25 {
26 char *begin, *end;
27
28 begin = *stringp;
29 if (begin == NULL)
30 return NULL;
31
32 /* A frequent case is when the delimiter string contains only one
33 character. Here we don't need to call the expensive `strpbrk'
34 function and instead work using `strchr'. */
35 if (delim[0] == '\0' || delim[1] == '\0')
36 {
37 char ch = delim[0];
38
39 if (ch == '\0')
40 end = NULL;
41 else
42 {
43 if (*begin == ch)
44 end = begin;
45 else if (*begin == '\0')
46 end = NULL;
47 else
48 end = strchr (begin + 1, ch);
49 }
50 }
51 else
52 /* Find the end of the token. */
53 end = strpbrk (begin, delim);
54
55 if (end)
56 {
57 /* Terminate the token and set *STRINGP past NUL character. */
58 *end++ = '\0';
59 *stringp = end;
60 }
61 else
62 /* No more delimiters; this is the last token. */
63 *stringp = NULL;
64
65 return begin;
66 }
67 #endif /* !HAVE_STRSEP */
68