#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;
}
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