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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stddef.h>
/**
* Tokenise a string.
*
* @param string The string to tokenise on the first,
* `NULL` on subsequent calls.
* All bytes found in `delimiters` will
* be overriden with NUL bytes.
* @param delimiters Delimiting bytes (not characters).
* @return The next non-empty string that does not
* contain a byte from `delimiters`. The
* returned string will be as long as possible.
* `NULL` is returned the search as reached
* the end of the string, and there therefore
* are no more tokens.
*/
char* strtok(char* restrict string, const char* restrict delimiters)
{
static char* state = NULL;
if (string == NULL)
state = NULL;
return strtok_r(string, delimiters, &state);
}
/**
* Tokenise a string.
*
* @param string The string to tokenise on the first,
* `NULL` on subsequent calls.
* All bytes found in `delimiters` will
* be overriden with NUL bytes.
* @param delimiters Delimiting bytes (not characters).
* @param state Pointer to a `char*` that the function
* can use to keep track of its state.
* It is reasonable to make it point to `NULL`
* on the first call.
* @return The next non-empty string that does not
* contain a byte from `delimiters`. The
* returned string will be as long as possible.
* `NULL` is returned the search as reached
* the end of the string, and there therefore
* are no more tokens.
*/
char* strtok_r(char* restrict string, const char* restrict delimiters,
char** restrict state)
{
char* r;
if (string == NULL)
*state = string;
for (;;)
{
r = strsep(state, delimiters);
if (r == NULL)
return NULL;
if (*r)
return r;
}
}
/**
* Tokenise a string.
*
* @param string Pointer to the string to tokenise on the first call,
* will be updated to keep track of the state.
* All bytes found in `delimiters` will
* be overriden with NUL bytes.
* @param delimiters Delimiting bytes (not characters).
* @return The next, possibly empty, string that does
* not contain a byte from `delimiters`. The
* returned string will be as long as possible.
* `NULL` is returned the search as reached
* the end of the string, and there therefore
* are no more tokens.
*/
char* strsep(char** restrict string, const char* restrict delimiters)
{
char* r = *string;
char* next;
if (r == NULL)
return NULL;
next = stpbrk(string, delimiters);
if (next != NULL)
*next++ = 0;
*string = next;
return r;
}
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