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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/libc/port/u16.c – Rev 2

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#include <u.h>
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#include <libc.h>
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static char t16e[] = "0123456789ABCDEF";
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int
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dec16(uchar *out, int lim, char *in, int n)
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{
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	int c, w = 0, i = 0;
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	uchar *start = out;
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	uchar *eout = out + lim;
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	while(n-- > 0){
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		c = *in++;
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		if('0' <= c && c <= '9')
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			c = c - '0';
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		else if('a' <= c && c <= 'z')
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			c = c - 'a' + 10;
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		else if('A' <= c && c <= 'Z')
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			c = c - 'A' + 10;
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		else
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			continue;
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		w = (w<<4) + c;
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		i++;
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		if(i == 2){
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			if(out + 1 > eout)
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				goto exhausted;
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			*out++ = w;
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			w = 0;
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			i = 0;
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		}
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	}
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exhausted:
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	return out - start;
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}
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int
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enc16(char *out, int lim, uchar *in, int n)
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{
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	uint c;
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	char *eout = out + lim;
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	char *start = out;
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	while(n-- > 0){
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		c = *in++;
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		if(out + 2 >= eout)
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			goto exhausted;
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		*out++ = t16e[c>>4];
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		*out++ = t16e[c&0xf];
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	}
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exhausted:
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	*out = 0;
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	return out - start;
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}