strcasestr.c
上传用户:zibowangxu
上传日期:2007-01-04
资源大小:331k
文件大小:2k
- /****************************************************************************
-
- Copyright (c) 1999 WU-FTPD Development Group.
- All rights reserved.
-
- Portions Copyright (c) 1980, 1985, 1988, 1989, 1990, 1991, 1993, 1994
- The Regents of the University of California.
- Portions Copyright (c) 1993, 1994 Washington University in Saint Louis.
- Portions Copyright (c) 1996, 1998 Berkeley Software Design, Inc.
- Portions Copyright (c) 1989 Massachusetts Institute of Technology.
- Portions Copyright (c) 1998 Sendmail, Inc.
- Portions Copyright (c) 1983, 1995, 1996, 1997 Eric P. Allman.
- Portions Copyright (c) 1997 by Stan Barber.
- Portions Copyright (c) 1997 by Kent Landfield.
- Portions Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
- Free Software Foundation, Inc.
-
- Use and distribution of this software and its source code are governed
- by the terms and conditions of the WU-FTPD Software License ("LICENSE").
-
- If you did not receive a copy of the license, it may be obtained online
- at http://www.wu-ftpd.org/license.html.
-
- $Id: strcasestr.c,v 1.4 1999/08/24 23:25:37 wuftpd Exp $
-
- ****************************************************************************/
- #include <string.h>
- /*
- * Find the first occurrence of find in s.
- */
- char *strcasestr(register char *s, register char *find)
- {
- register char c, sc;
- register size_t len;
- if ((c = *find++) != 0) {
- len = strlen(find);
- do {
- do {
- if ((sc = *s++) == 0)
- return (NULL);
- } while (sc != c);
- } while (strncasecmp(s, find, len) != 0);
- s--;
- }
- return ((char *) s);
- }