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

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24: static char sccsid[] = "@(#)strcspn.c  5.5 (Berkeley) 5/16/90";
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: #include <sys/stdc.h>
        !            28: #include <string.h>
        !            29: 
        !            30: /*
        !            31:  * Span the complement of string s2.
        !            32:  */
        !            33: size_t
        !            34: strcspn(s1, s2)
        !            35:        const char *s1;
        !            36:        register const char *s2;
        !            37: {
        !            38:        register const char *p, *spanp;
        !            39:        register char c, sc;
        !            40: 
        !            41:        /*
        !            42:         * Stop as soon as we find any character from s2.  Note that there
        !            43:         * must be a NUL in s2; it suffices to stop when we find that, too.
        !            44:         */
        !            45:        for (p = s1;;) {
        !            46:                c = *p++;
        !            47:                spanp = s2;
        !            48:                do {
        !            49:                        if ((sc = *spanp++) == c)
        !            50:                                return (p - 1 - s1);
        !            51:                } while (sc != 0);
        !            52:        }
        !            53:        /* NOTREACHED */
        !            54: }

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