xref: /curl/lib/strtok.c (revision c074ba64)
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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
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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.
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21  * SPDX-License-Identifier: curl
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24 
25 #include "curl_setup.h"
26 
27 #ifndef HAVE_STRTOK_R
28 #include <stddef.h>
29 
30 #include "strtok.h"
31 
32 char *
Curl_strtok_r(char * ptr,const char * sep,char ** end)33 Curl_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 was not present */
69