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Annotation of 43BSDReno/lib/libc/string/strstr.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[] = "@(#)strstr.c   5.1 (Berkeley) 5/15/90";
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: #include <string.h>
                     28: #include <sys/stdc.h>
                     29: 
                     30: /*
                     31:  * Find the first occurrence of find in s.
                     32:  */
                     33: char *
                     34: strstr(s, find)
                     35:        register const char *s, *find;
                     36: {
                     37:        register char c, sc;
                     38:        register size_t len;
                     39: 
                     40:        if ((c = *find++) != 0) {
                     41:                len = strlen(find);
                     42:                do {
                     43:                        do {
                     44:                                if ((sc = *s++) == 0)
                     45:                                        return (NULL);
                     46:                        } while (sc != c);
                     47:                } while (strncmp(s, find, len) != 0);
                     48:                s--;
                     49:        }
                     50:        return ((char *)s);
                     51: }

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