/* strstr.c - file for string *//* Copyright 1992-1993 Wind River Systems, Inc. *//*modification history--------------------01c,25feb93,jdi  documentation cleanup for 5.1.01b,20sep92,smb  documentation additions01a,08jul92,smb  written and documented.*//*DESCRIPTIONINCLUDE FILES: string.hSEE ALSO: American National Standard X3.159-1989NOMANUAL*/#include "vxWorks.h"#include "string.h"/******************************************************************************** strstr - find the first occurrence of a substring in a string (ANSI)** This routine locates the first occurrence in string <s>* of the sequence of characters (excluding the terminating null character)* in the string <find>.** INCLUDE FILES: string.h** RETURNS:* A pointer to the located substring, or <s> if <find> points to a* zero-length string, or NULL if the string is not found.*/char * strstr    (    const char * s,        /* string to search */    const char * find      /* substring to look for */    )    {    char *t1;    char *t2;    char c;    char c2;    if ((c = *find++) == EOS)		/* <find> an empty string */	return (CHAR_FROM_CONST(s));    FOREVER	{	while (((c2 = *s++) != EOS) && (c2 != c))	    ;	if (c2 == EOS)	    return (NULL);	t1 = CHAR_FROM_CONST(s);	t2 = CHAR_FROM_CONST(find); 	while (((c2 = *t2++) != 0) && (*t1++ == c2))	    ;	if (c2 == EOS)	    return (CHAR_FROM_CONST(s - 1));	}    }