ax-libc 0.5.12

ArceOS user program library for C apps
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#include <ctype.h>
#include <stdio.h>
#include <string.h>

int tolower(int c)
{
    if (isupper(c))
        return c | 32;
    return c;
}

int toupper(int c)
{
    if (islower(c))
        return c & 0x5f;
    return c;
}