ref: 0afdb5fa224e02117024f5abc4a6925a42e5bb62
dir: /sys/src/cmd/cifs/misc.c/
#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;
}