source: azure_iot_hub/trunk/musl-1.1.18/src/ctype/isalpha.c@ 388

#include <ctype.h>
#include "libc.h"
#undef isalpha

int isalpha(int c)
{
        return ((unsigned)c|32)-'a' < 26;
}

int __isalpha_l(int c, locale_t l)
{
        return isalpha(c);
}

weak_alias(__isalpha_l, isalpha_l);