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FORK: Simple Directmedia Layer
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SDL_strtokr.c (3002B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 #if defined(__clang_analyzer__)
     22 #define SDL_DISABLE_ANALYZE_MACROS 1
     23 #endif
     24 
     25 #include "../SDL_internal.h"
     26 
     27 #include "SDL_stdinc.h"
     28 
     29 char *SDL_strtokr(char *s1, const char *s2, char **ptr)
     30 {
     31 #if defined(HAVE_STRTOK_R)
     32     return strtok_r(s1, s2, ptr);
     33 
     34 #elif defined(_MSC_VER) && defined(HAVE_STRTOK_S)
     35     return strtok_s(s1, s2, ptr);
     36 
     37 #else /* SDL implementation */
     38 /*
     39  * Adapted from _PDCLIB_strtok() of PDClib library at
     40  * https://github.com/DevSolar/pdclib.git
     41  *
     42  * The code was under CC0 license:
     43  * https://creativecommons.org/publicdomain/zero/1.0/legalcode :
     44  *
     45  *                        No Copyright
     46  *
     47  * The person who associated a work with this deed has dedicated the
     48  * work to the public domain by waiving all of his or her rights to
     49  * the work worldwide under copyright law, including all related and
     50  * neighboring rights, to the extent allowed by law.
     51  *
     52  * You can copy, modify, distribute and perform the work, even for
     53  * commercial purposes, all without asking permission. See Other
     54  * Information below.
     55  */
     56     const char *p = s2;
     57 
     58     if (!s2 || !ptr || (!s1 && !*ptr)) return NULL;
     59 
     60     if (s1 != NULL) {  /* new string */
     61         *ptr = s1;
     62     } else { /* old string continued */
     63         if (*ptr == NULL) {
     64         /* No old string, no new string, nothing to do */
     65             return NULL;
     66         }
     67         s1 = *ptr;
     68     }
     69 
     70     /* skip leading s2 characters */
     71     while (*p && *s1) {
     72         if (*s1 == *p) {
     73         /* found separator; skip and start over */
     74             ++s1;
     75             p = s2;
     76             continue;
     77         }
     78         ++p;
     79     }
     80 
     81     if (! *s1) { /* no more to parse */
     82         *ptr = s1;
     83         return NULL;
     84     }
     85 
     86     /* skipping non-s2 characters */
     87     *ptr = s1;
     88     while (**ptr) {
     89         p = s2;
     90         while (*p) {
     91             if (**ptr == *p++) {
     92             /* found separator; overwrite with '\0', position *ptr, return */
     93                 *((*ptr)++) = '\0';
     94                 return s1;
     95             }
     96         }
     97         ++(*ptr);
     98     }
     99 
    100     /* parsed to end of string */
    101     return s1;
    102 #endif
    103 }