/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. 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 REGENTS 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 REGENTS 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.
 */

/* #include <sys/cdefs.h> */
/* included manually */

#ifndef _CDEFS_H_
#define _CDEFS_H_

#if defined(__cplusplus)
#define __BEGIN_DECLS   extern "C" {
#define __END_DECLS };
#else
#define __BEGIN_DECLS
#define __END_DECLS
#endif

/*
 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
 * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
 * in between its arguments.  __CONCAT can also concatenate double-quoted
 * strings produced by the __STRING macro, but this only works with ANSI C.
 */
#if defined(__STDC__) || defined(__cplusplus)
#define __P(protos) protos      /* full-blown ANSI C */
#define __CONCAT(x,y)   x ## y
#define __STRING(x) #x

#if !defined(__GNUC__) && !defined(__cplusplus)
#define inline
#endif

#else   /* !(__STDC__ || __cplusplus) */
#define __P(protos) ()      /* traditional C preprocessor */
#define __CONCAT(x,y)   x/**/y
#define __STRING(x) "x"

#ifdef __GNUC__
#define const       __const     /* GCC: ANSI C with -traditional */
#define inline      __inline
#define signed      __signed
#define volatile    __volatile

#else   /* !__GNUC__ */
#define const               /* delete ANSI C keywords */
#define inline
#define signed
#define volatile
#endif  /* !__GNUC__ */
#endif  /* !(__STDC__ || __cplusplus) */

/*
 * GCC has extensions for declaring functions as `pure' (always returns
 * the same value given the same inputs, i.e., has no external state and
 * no side effects) and `dead' (nonreturning).  These mainly affect
 * optimization and warnings.  Unfortunately, GCC complains if these are
 * used under strict ANSI mode (`gcc -ansi -pedantic'), hence we need to
 * define them only if compiling without this.
 */
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define __dead __volatile
#define __pure __const
#else
#define __dead
#define __pure
#endif

#endif /* !_CDEFS_H_ */
/* end of manual inclusion */


#include <string.h>
#include <stdio.h>

#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)strsep.c  5.4 (Berkeley) 1/26/91";
#endif /* LIBC_SCCS and not lint */

/*
 * Get next token from string *stringp, where tokens are nonempty
 * strings separated by characters from delim.  
 *
 * Writes NULs into the string at *stringp to end tokens.
 * delim need not remain constant from call to call.
 * On return, *stringp points past the last NUL written (if there might
 * be further tokens), or is NULL (if there are definitely no more tokens).
 *
 * If *stringp is NULL, strtoken returns NULL.
 */
char * strsep(char **stringp, const char *delim) {
    register char *s;
    register const char *spanp;
    register int c, sc;
    char *tok;

    if ((s = *stringp) == NULL)
        return (NULL);
    for (tok = s;;) {
        c = *s++;
        spanp = delim;
        do {
            if ((sc = *spanp++) == c) {
                if (c == 0)
                    s = NULL;
                else
                    s[-1] = 0;
                *stringp = s;
                return (tok);
            }
        } while (sc != 0);
    }
    /* NOTREACHED */
}
