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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/str/strsep.c Normal file
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/*-*- 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;
}