56 lines
2.7 KiB
C
56 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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/**
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* Extracts non-empty tokens from string.
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*
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* @param s is mutated and should be NULL on subsequent calls
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* @param sep is a NUL-terminated set of bytes to consider separators
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* @param state tracks progress between calls
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* @return pointer to next token or NULL for end
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* @see strsep() which is similar
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* @asyncsignalsafe
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*/
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char *strtok_r(char *s, const char *sep, char **state) {
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size_t leadingseps, tokenlen;
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if (!s) {
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s = *state;
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if (!s) {
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return NULL;
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}
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}
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leadingseps = strspn(s, sep);
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s += leadingseps;
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if (*s) {
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tokenlen = strcspn(s, sep);
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if (s[tokenlen]) {
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s[tokenlen] = '\0';
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*state = &s[tokenlen + 1];
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return s;
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} else if (tokenlen) {
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s[tokenlen] = '\0';
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*state = NULL;
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return s;
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}
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}
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return (*state = NULL);
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}
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