ctype.h

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#ifndef BOOT_ISDIGIT_H

#define BOOT_ISDIGIT_H

static inline int isdigit(int ch)
{
    return (ch >= '0') && (ch <= '9');
}

static inline int isxdigit(int ch)
{
    if (isdigit(ch))
        return true;

    if ((ch >= 'a') && (ch <= 'f'))
        return true;

    return (ch >= 'A') && (ch <= 'F');
}

#endif