xref: /third_party/curl/lib/strtok.c (revision 13498266) 
1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25#include "curl_setup.h"
26
27#ifndef HAVE_STRTOK_R
28#include <stddef.h>
29
30#include "strtok.h"
31
32char *
33Curl_strtok_r(char *ptr, const char *sep, char **end)
34{
35  if(!ptr)
36    /* we got NULL input so then we get our last position instead */
37    ptr = *end;
38
39  /* pass all letters that are including in the separator string */
40  while(*ptr && strchr(sep, *ptr))
41    ++ptr;
42
43  if(*ptr) {
44    /* so this is where the next piece of string starts */
45    char *start = ptr;
46
47    /* set the end pointer to the first byte after the start */
48    *end = start + 1;
49
50    /* scan through the string to find where it ends, it ends on a
51       null byte or a character that exists in the separator string */
52    while(**end && !strchr(sep, **end))
53      ++*end;
54
55    if(**end) {
56      /* the end is not a null byte */
57      **end = '\0';  /* null-terminate it! */
58      ++*end;        /* advance the last pointer to beyond the null byte */
59    }
60
61    return start; /* return the position where the string starts */
62  }
63
64  /* we ended up on a null byte, there are no more strings to find! */
65  return NULL;
66}
67
68#endif /* this was only compiled if strtok_r wasn't present */
69