Ultrix-3.1/src/libPW/index.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

static char Sccsid[]="@(#)index.c 3.0 4/22/86";
/*
	If `s2' is a substring of `s1' return the offset of the first
	occurrence of `s2' in `s1',
	else return -1.
*/

index(as1,as2)
char *as1,*as2;
{
	register char *s1,*s2,c;
	int offset;

	s1 = as1;
	s2 = as2;
	c = *s2;

	while (*s1)
		if (*s1++ == c) {
			offset = s1 - as1 - 1;
			s2++;
			while ((c = *s2++) == *s1++ && c) ;
			if (c == 0)
				return(offset);
			s1 = offset + as1 + 1;
			s2 = as2;
			c = *s2;
		}
	 return(-1);
}