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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2022 by William WIlgus
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied. *
****************************************************************************/
#include "config.h"
#include <stddef.h>
#include <string.h>
#include "strtok_r.h"
/* strptokspn_r is a custom implementation of strtok_r that does NOT modify
* the source string.
*
* strptokspn_r reads ptr as a series of zero or more tokens,
* and sep as delimiters of the tokens
* The tokens can be separated by one or more of the delimiters
* first call searches for the first token skipping over any leading delimiters.
* Returns pointer to first token
* Pointer *len contains the span to the first delimeter
* (this would be the resulting strlen had token actually been NULL terminated)
* Pointer **end contains pointer to first character after the last delimeter
*
* When strptokspn_r is called with a ptr == NULL, the next token is read from
* Pointer **end
*
* Note the returned token is NOT NULL terminated by the function as in strtok_r
* However the caller can use ret[len+1] = '\0'; to emulate a call to strtok_r
*/
const char *strptokspn_r(const char *ptr, const char *sep, size_t *len, const char **end)
{
*len = 0;
if (!ptr)
/* we got NULL input so then we get our last position instead */
ptr = *end;
/* pass all letters that are including in the separator string */
while (*ptr && strchr(sep, *ptr))
++ptr;
if (*ptr) {
/* so this is where the next piece of string starts */
const char *start = ptr;
/* set the end pointer to the first byte after the start */
*end = start + 1;
/* scan through the string to find where it ends, it ends on a
null byte or a character that exists in the separator string */
while (**end && !strchr(sep, **end))
++*end;
*len = (*end - start) - 1; /* this would be the string len if there actually was a NULL */
if (**end) { /* the end is not a null byte */
++*end; /* advance last pointer to beyond the match */
}
return start; /* return the position where the string starts */
}
/* we ended up on a null byte, there are no more strings to find! */
return NULL;
}
#if !defined(HAVE_STRTOK_R)
char * strtok_r(char *ptr, const char *sep, char **end)
{
size_t len;
char * ret = (char*) strptokspn_r((const char*)ptr, sep, &len, (const char**) end);
if (ret)
ret[len + 1] = '\0';
return ret;
}
#endif
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