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