/*
   =============================================================================
	strrevi.c -- reverse a string in place
	Version 1 -- 1988-02-03 -- D.N. Lynx Crowe

	char *
	strrevi(s)
	char *s;

		Reverses string 's1' in place.  Returns 's1'.
   =============================================================================
*/

char *
strrevi(s)
char *s;
{
	register char *p1, *p2;
	register long i;
	register char c;

	p1 = s;			/* initialize left end pointer */
	p2 = s;			/* initialize right end pointer */
	i = 0L;			/* initialize character count */

	while (*p2) {		/* find the right end of the string */

		++i;
		++p2;
	}

	--p2;			/* adjust right end pointer */
	i >>= 1;		/* calculate swap count */

	while (i--) {		/* for each pair of characters ... */

		c = *p2;	/* ... swap right and left characters */
		*p2-- = *p1;
		*p1++ = c;
	}

	return(s);		/* return pointer to reversed string */
}