50 lines
2.9 KiB
C
50 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ 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; version 2 of the License. │
|
|
│ │
|
|
│ 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, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/str/str.h"
|
|
|
|
/**
|
|
* Tokenizes string.
|
|
*
|
|
* This works by mutating the caller's pointer and the string itself.
|
|
* The returned value is the next available token, or NULL if we've
|
|
* reached the end. Upon each call, *str is updated to point past the
|
|
* terminator we inserted. Multiple delimiter bytes may be passed, which
|
|
* are treated as a set of characters, not a substring.
|
|
*
|
|
* @param str on first call points to var holding string to be tokenized
|
|
* and is used by this function to track state on subsequent calls
|
|
* @param delim is a set of characters that constitute separators
|
|
* @return next token or NULL when we've reached the end or *str==NULL
|
|
* @note unlike strtok() this does empty tokens and is re-entrant
|
|
*/
|
|
char *strsep(char **str, const char *delim) {
|
|
char *token = *str;
|
|
if (token) {
|
|
size_t i = strcspn(token, delim);
|
|
char *next = NULL;
|
|
if (token[i]) {
|
|
token[i] = '\0';
|
|
next = &token[i + 1];
|
|
}
|
|
*str = next;
|
|
}
|
|
return token;
|
|
}
|