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Annotation of 43BSDReno/lib/libc/string/strtok.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)strtok.c   5.7 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <stddef.h>
        !            25: #include <string.h>
        !            26: 
        !            27: char *
        !            28: strtok(s, delim)
        !            29:        register char *s, *delim;
        !            30: {
        !            31:        register char *spanp;
        !            32:        register int c, sc;
        !            33:        char *tok;
        !            34:        static char *last;
        !            35: 
        !            36: 
        !            37:        if (s == NULL && (s = last) == NULL)
        !            38:                return (NULL);
        !            39: 
        !            40:        /*
        !            41:         * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
        !            42:         */
        !            43: cont:
        !            44:        c = *s++;
        !            45:        for (spanp = delim; (sc = *spanp++) != 0;) {
        !            46:                if (c == sc)
        !            47:                        goto cont;
        !            48:        }
        !            49: 
        !            50:        if (c == 0) {           /* no non-delimiter characters */
        !            51:                last = NULL;
        !            52:                return (NULL);
        !            53:        }
        !            54:        tok = s - 1;
        !            55: 
        !            56:        /*
        !            57:         * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
        !            58:         * Note that delim must have one NUL; we stop if we see that, too.
        !            59:         */
        !            60:        for (;;) {
        !            61:                c = *s++;
        !            62:                spanp = delim;
        !            63:                do {
        !            64:                        if ((sc = *spanp++) == c) {
        !            65:                                if (c == 0)
        !            66:                                        s = NULL;
        !            67:                                else
        !            68:                                        s[-1] = 0;
        !            69:                                last = s;
        !            70:                                return (tok);
        !            71:                        }
        !            72:                } while (sc != 0);
        !            73:        }
        !            74:        /* NOTREACHED */
        !            75: }

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