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50 lines
2.8 KiB
C
50 lines
2.8 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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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size_t i;
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char *token, *next;
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token = *str;
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if (token) {
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i = strcspn(token, delim);
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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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