50 lines
2.9 KiB
C
50 lines
2.9 KiB
C
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/*-*- 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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* Tokenizes string.
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*
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* This works by mutating the caller's pointer and the string itself.
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* The returned value is the next available token, or NULL if we've
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* reached the end. Upon each call, *str is updated to point past the
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* terminator we inserted. Multiple delimiter bytes may be passed, which
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* are treated as a set of characters, not a substring.
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*
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* @param str on first call points to var holding string to be tokenized
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* and is used by this function to track state on subsequent calls
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* @param delim is a set of characters that constitute separators
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* @return next token or NULL when we've reached the end or *str==NULL
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* @note unlike strtok() this does empty tokens and is re-entrant
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*/
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char *strsep(char **str, const char *delim) {
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char *token = *str;
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if (token) {
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size_t i = strcspn(token, delim);
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char *next = NULL;
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if (token[i]) {
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token[i] = '\0';
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next = &token[i + 1];
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}
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*str = next;
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}
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return token;
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}
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