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static char rcsid[] = "@(#)$Id: strstr.c,v 5.1 1992/10/03 22:41:36 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 5.1 $ $State: Exp $
*
* Copyright (c) 1988-1992 USENET Community Trust
* Copyright (c) 1986,1987 Dave Taylor
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: strstr.c,v $
* Revision 5.1 1992/10/03 22:41:36 syd
* Initial checkin as of 2.4 Release at PL0
*
*
******************************************************************************/
/** look for substring in string
**/
#include "headers.h"
/*
* strstr() -- Locates a substring.
*
* This is a replacement for the POSIX function which does not
* appear on all systems.
*
* Synopsis:
* #include <string.h>
* char *strstr(const char *s1, const char *s2);
*
* Arguments:
* s1 Pointer to the subject string.
* s2 Pointer to the substring to locate.
*
* Returns:
* A pointer to the located string or NULL
*
* Description:
* The strstr() function locates the first occurence in s1 of
* the string s2. The terminating null characters are not
* compared.
*/
char *strstr(s1, s2)
char *s1, *s2;
{
int len;
char *ptr;
char *tmpptr;
ptr = NULL;
len = strlen(s2);
if ( len <= strlen(s1)) {
tmpptr = s1;
while ((ptr = index(tmpptr, (int)*s2)) != NULL) {
if (strncmp(ptr, s2, len) == 0) {
break;
}
tmpptr = ptr+1;
}
}
return (ptr);
}
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