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#define LENGTH(x) ((int)(sizeof (x) / sizeof *(x)))
#define MIN(a, b) ((a) > (b) ? (b) : (a))
#define MAX(a, b) ((a) < (b) ? (b) : (a))
/* is c the start of a utf8 sequence? */
#define isutf8(c) (((c)&0xC0)!=0x80)
#define ISASCII(ch) ((unsigned char)ch < 0x80)
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