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	convM2D.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	convM2D.c (1990B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3 #include <fcall.h>
	4
	5 int
	6 statchecku(uchar *buf, uint nbuf, int dotu)
	7 {
	8 uchar *ebuf;
	9 int i, nstr;
	10
	11 ebuf = buf + nbuf;
	12
	13 if(nbuf < STATFIXLEN \|\| nbuf != BIT16SZ + GBIT16(buf))
	14 return -1;
	15
	16 buf += STATFIXLEN - 4 * BIT16SZ;
	17
	18 nstr = 4;
	19 if(dotu)
	20 nstr = 5;
	21 for(i = 0; i < nstr; i++){
	22 if(buf + BIT16SZ > ebuf)
	23 return -1;
	24 buf += BIT16SZ + GBIT16(buf);
	25 }
	26
	27 if(dotu)
	28 buf += 3*BIT32SZ;
	29
	30 if(buf != ebuf)
	31 return -1;
	32
	33 return 0;
	34 }
	35
	36 int
	37 statcheck(uchar *buf, uint nbuf)
	38 {
	39 return statchecku(buf, nbuf, 0);
	40 }
	41
	42 static char nullstring[] = "";
	43
	44 uint
	45 convM2Du(uchar buf, uint nbuf, Dir d, char *strs, int dotu)
	46 {
	47 uchar p, ebuf;
	48 char *sv[5];
	49 int i, ns, nstr;
	50
	51 if(nbuf < STATFIXLEN)
	52 return 0;
	53
	54 p = buf;
	55 ebuf = buf + nbuf;
	56
	57 p += BIT16SZ; /* ignore size */
	58 d->type = GBIT16(p);
	59 p += BIT16SZ;
	60 d->dev = GBIT32(p);
	61 p += BIT32SZ;
	62 d->qid.type = GBIT8(p);
	63 p += BIT8SZ;
	64 d->qid.vers = GBIT32(p);
	65 p += BIT32SZ;
	66 d->qid.path = GBIT64(p);
	67 p += BIT64SZ;
	68 d->mode = GBIT32(p);
	69 p += BIT32SZ;
	70 d->atime = GBIT32(p);
	71 p += BIT32SZ;
	72 d->mtime = GBIT32(p);
	73 p += BIT32SZ;
	74 d->length = GBIT64(p);
	75 p += BIT64SZ;
	76
	77 nstr = 4;
	78 if(dotu)
	79 nstr = 5;
	80 for(i = 0; i < nstr; i++){
	81 if(p + BIT16SZ > ebuf)
	82 return 0;
	83 ns = GBIT16(p);
	84 p += BIT16SZ;
	85 if(p + ns > ebuf)
	86 return 0;
	87 if(strs){
	88 sv[i] = strs;
	89 memmove(strs, p, ns);
	90 strs += ns;
	91 *strs++ = '\0';
	92 }
	93 p += ns;
	94 }
	95
	96 if(dotu){
	97 if(p + BIT32SZ*3 > ebuf)
	98 return 0;
	99 d->uidnum = GBIT32(p);
	100 p += BIT32SZ;
	101 d->gidnum = GBIT32(p);
	102 p += BIT32SZ;
	103 d->muidnum = GBIT32(p);
	104 p += BIT32SZ;
	105 }
	106
	107 if(strs){
	108 d->name = sv[0];
	109 d->uid = sv[1];
	110 d->gid = sv[2];
	111 d->muid = sv[3];
	112 d->ext = nullstring;
	113 if(dotu)
	114 d->ext = sv[4];
	115 }else{
	116 d->name = nullstring;
	117 d->uid = nullstring;
	118 d->gid = nullstring;
	119 d->muid = nullstring;
	120 d->ext = nullstring;
	121 }
	122
	123 return p - buf;
	124 }
	125
	126 uint
	127 convM2D(uchar buf, uint nbuf, Dir d, char *strs)
	128 {
	129 return convM2Du(buf, nbuf, d, strs, 0);
	130 }