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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/libc/9sys/convM2D.c – Rev 2

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#include	<u.h>
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#include	<libc.h>
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#include	<fcall.h>
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int
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statcheck(uchar *buf, uint nbuf)
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{
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	uchar *ebuf;
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	int i;
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	ebuf = buf + nbuf;
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	if(nbuf < STATFIXLEN || nbuf != BIT16SZ + GBIT16(buf))
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		return -1;
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	buf += STATFIXLEN - 4 * BIT16SZ;
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	for(i = 0; i < 4; i++){
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		if(buf + BIT16SZ > ebuf)
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			return -1;
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		buf += BIT16SZ + GBIT16(buf);
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	}
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	if(buf != ebuf)
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		return -1;
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	return 0;
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}
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static char nullstring[] = "";
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uint
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convM2D(uchar *buf, uint nbuf, Dir *d, char *strs)
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{
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	uchar *p, *ebuf;
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	char *sv[4];
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	int i, ns;
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	if(nbuf < STATFIXLEN)
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		return 0;
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	p = buf;
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	ebuf = buf + nbuf;
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	p += BIT16SZ;	/* ignore size */
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	d->type = GBIT16(p);
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	p += BIT16SZ;
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	d->dev = GBIT32(p);
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	p += BIT32SZ;
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	d->qid.type = GBIT8(p);
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	p += BIT8SZ;
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	d->qid.vers = GBIT32(p);
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	p += BIT32SZ;
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	d->qid.path = GBIT64(p);
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	p += BIT64SZ;
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	d->mode = GBIT32(p);
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	p += BIT32SZ;
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	d->atime = GBIT32(p);
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	p += BIT32SZ;
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	d->mtime = GBIT32(p);
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	p += BIT32SZ;
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	d->length = GBIT64(p);
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	p += BIT64SZ;
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	for(i = 0; i < 4; i++){
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		if(p + BIT16SZ > ebuf)
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			return 0;
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		ns = GBIT16(p);
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		p += BIT16SZ;
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		if(p + ns > ebuf)
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			return 0;
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		if(strs){
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			sv[i] = strs;
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			memmove(strs, p, ns);
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			strs += ns;
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			*strs++ = '\0';
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		}
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		p += ns;
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	}
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	if(strs){
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		d->name = sv[0];
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		d->uid = sv[1];
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		d->gid = sv[2];
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		d->muid = sv[3];
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	}else{
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		d->name = nullstring;
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		d->uid = nullstring;
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		d->gid = nullstring;
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		d->muid = nullstring;
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	}
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	return p - buf;
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}