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	u16.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	u16.c (808B)
	---
	1 #include <lib9.h>
	2 static char t16e[] = "0123456789ABCDEF";
	3
	4 int
	5 dec16(uchar out, int lim, char in, int n)
	6 {
	7 int c, w = 0, i = 0;
	8 uchar *start = out;
	9 uchar *eout = out + lim;
	10
	11 while(n-- > 0){
	12 c = *in++;
	13 if('0' <= c && c <= '9')
	14 c = c - '0';
	15 else if('a' <= c && c <= 'z')
	16 c = c - 'a' + 10;
	17 else if('A' <= c && c <= 'Z')
	18 c = c - 'A' + 10;
	19 else
	20 continue;
	21 w = (w<<4) + c;
	22 i++;
	23 if(i == 2){
	24 if(out + 1 > eout)
	25 goto exhausted;
	26 *out++ = w;
	27 w = 0;
	28 i = 0;
	29 }
	30 }
	31 exhausted:
	32 return out - start;
	33 }
	34
	35 int
	36 enc16(char out, int lim, uchar in, int n)
	37 {
	38 uint c;
	39 char *eout = out + lim;
	40 char *start = out;
	41
	42 while(n-- > 0){
	43 c = *in++;
	44 if(out + 2 >= eout)
	45 goto exhausted;
	46 *out++ = t16e[c>>4];
	47 *out++ = t16e[c&0xf];
	48 }
	49 exhausted:
	50 *out = 0;
	51 return out - start;
	52 }