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Annotation of prex-old/usr/lib/libc/string/strsep.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 1990, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the University nor the names of its contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <sys/cdefs.h>
        !            31: #include <string.h>
        !            32: #include <stdio.h>
        !            33:
        !            34: /*
        !            35:  * Get next token from string *stringp, where tokens are possibly-empty
        !            36:  * strings separated by characters from delim.
        !            37:  *
        !            38:  * Writes NULs into the string at *stringp to end tokens.
        !            39:  * delim need not remain constant from call to call.
        !            40:  * On return, *stringp points past the last NUL written (if there might
        !            41:  * be further tokens), or is NULL (if there are definitely no more tokens).
        !            42:  *
        !            43:  * If *stringp is NULL, strsep returns NULL.
        !            44:  */
        !            45: char *
        !            46: strsep(stringp, delim)
        !            47:        char **stringp;
        !            48:        const char *delim;
        !            49: {
        !            50:        char *s;
        !            51:        const char *spanp;
        !            52:        int c, sc;
        !            53:        char *tok;
        !            54:
        !            55:        if ((s = *stringp) == NULL)
        !            56:                return (NULL);
        !            57:        for (tok = s;;) {
        !            58:                c = *s++;
        !            59:                spanp = delim;
        !            60:                do {
        !            61:                        if ((sc = *spanp++) == c) {
        !            62:                                if (c == 0)
        !            63:                                        s = NULL;
        !            64:                                else
        !            65:                                        s[-1] = 0;
        !            66:                                *stringp = s;
        !            67:                                return (tok);
        !            68:                        }
        !            69:                } while (sc != 0);
        !            70:        }
        !            71:        /* NOTREACHED */
        !            72: }