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Annotation of 43BSDReno/lib/libc/string/strtok.c, revision 1.1.1.1

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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