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

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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