/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <ctype.h> char*strupr(char *s){	char *p; 	for(p = s; *p; p++)		if(*p >= 0 && islower(*p))			*p = toupper(*p);	return s;} char*strlwr(char *s){	char *p; 	for(p = s; *p; p++)		if(*p >= 0 && isupper(*p))			*p = tolower(*p);	return s;}