97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This file is shared between libc and the kernel, so don't put anything
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* in here that won't work in both contexts.
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*/
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#ifdef _KERNEL
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#include <types.h>
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#include <lib.h>
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#else
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#include <string.h>
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#endif
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/*
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* Standard C string function: tokenize a string splitting based on a
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* list of separator characters. Reentrant version.
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*
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* The "context" argument should point to a "char *" that is preserved
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* between calls to strtok_r that wish to operate on same string.
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*/
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char *
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strtok_r(char *string, const char *seps, char **context)
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{
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char *head; /* start of word */
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char *tail; /* end of word */
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/* If we're starting up, initialize context */
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if (string) {
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*context = string;
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}
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/* Get potential start of this next word */
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head = *context;
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if (head == NULL) {
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return NULL;
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}
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/* Skip any leading separators */
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while (*head && strchr(seps, *head)) {
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head++;
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}
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/* Did we hit the end? */
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if (*head == 0) {
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/* Nothing left */
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*context = NULL;
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return NULL;
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}
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/* skip over word */
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tail = head;
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while (*tail && !strchr(seps, *tail)) {
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tail++;
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}
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/* Save head for next time in context */
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if (*tail == 0) {
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*context = NULL;
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}
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else {
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*tail = 0;
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tail++;
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*context = tail;
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}
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/* Return current word */
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return head;
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}
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