#include "string.h"

int
toupper(int c)
{
    if(c >= 'a' && c <= 'z')
        c -= ('a' - 'A');
    return c;
}

char*
stoupper(char *s)
{
    char *o = s;
    for(; *s != 0; s++)
        *s = toupper(*s);
    return o;
}

char*
sntoupper(char *s, size_t limit)
{
    for(size_t i = 0; i < limit; i++)
        s[i] = toupper(s[i]);
    return s;
}