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	convD2M.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	convD2M.c (1927B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3 #include <fcall.h>
	4
	5 uint
	6 sizeD2Mu(Dir *d, int dotu)
	7 {
	8 char *sv[5];
	9 int i, ns, nstr, fixlen;
	10
	11 sv[0] = d->name;
	12 sv[1] = d->uid;
	13 sv[2] = d->gid;
	14 sv[3] = d->muid;
	15
	16 fixlen = STATFIXLEN;
	17 nstr = 4;
	18 if(dotu){
	19 fixlen = STATFIXLENU;
	20 sv[4] = d->ext;
	21 nstr = 5;
	22 }
	23
	24 ns = 0;
	25 for(i = 0; i < nstr; i++)
	26 if(sv[i])
	27 ns += strlen(sv[i]);
	28
	29 return fixlen + ns;
	30 }
	31
	32 uint
	33 sizeD2M(Dir *d)
	34 {
	35 return sizeD2Mu(d, 0);
	36 }
	37
	38 uint
	39 convD2Mu(Dir d, uchar buf, uint nbuf, int dotu)
	40 {
	41 uchar p, ebuf;
	42 char *sv[5];
	43 int i, ns, nsv[5], ss, nstr, fixlen;
	44
	45 if(nbuf < BIT16SZ)
	46 return 0;
	47
	48 p = buf;
	49 ebuf = buf + nbuf;
	50
	51 sv[0] = d->name;
	52 sv[1] = d->uid;
	53 sv[2] = d->gid;
	54 sv[3] = d->muid;
	55
	56 fixlen = STATFIXLEN;
	57 nstr = 4;
	58 if(dotu){
	59 fixlen = STATFIXLENU;
	60 sv[4] = d->ext;
	61 nstr = 5;
	62 }
	63
	64 ns = 0;
	65 for(i = 0; i < nstr; i++){
	66 if(sv[i])
	67 nsv[i] = strlen(sv[i]);
	68 else
	69 nsv[i] = 0;
	70 ns += nsv[i];
	71 }
	72
	73 ss = fixlen + ns;
	74
	75 /* set size befor erroring, so user can know how much is needed …
	76 /* note that length excludes count field itself */
	77 PBIT16(p, ss-BIT16SZ);
	78 p += BIT16SZ;
	79
	80 if(ss > nbuf)
	81 return BIT16SZ;
	82
	83 PBIT16(p, d->type);
	84 p += BIT16SZ;
	85 PBIT32(p, d->dev);
	86 p += BIT32SZ;
	87 PBIT8(p, d->qid.type);
	88 p += BIT8SZ;
	89 PBIT32(p, d->qid.vers);
	90 p += BIT32SZ;
	91 PBIT64(p, d->qid.path);
	92 p += BIT64SZ;
	93 PBIT32(p, d->mode);
	94 p += BIT32SZ;
	95 PBIT32(p, d->atime);
	96 p += BIT32SZ;
	97 PBIT32(p, d->mtime);
	98 p += BIT32SZ;
	99 PBIT64(p, d->length);
	100 p += BIT64SZ;
	101
	102 for(i = 0; i < nstr; i++){
	103 ns = nsv[i];
	104 if(p + ns + BIT16SZ > ebuf)
	105 return 0;
	106 PBIT16(p, ns);
	107 p += BIT16SZ;
	108 if(ns)
	109 memmove(p, sv[i], ns);
	110 p += ns;
	111 }
	112
	113 if(dotu){
	114 PBIT32(p, d->uidnum);
	115 p += BIT32SZ;
	116 PBIT32(p, d->gidnum);
	117 p += BIT32SZ;
	118 PBIT32(p, d->muidnum);
	119 p += BIT32SZ;
	120 }
	121
	122 if(ss != p - buf)
	123 return 0;
	124
	125 return p - buf;
	126 }
	127
	128 uint
	129 convD2M(Dir d, uchar buf, uint nbuf)
	130 {
	131 return convD2Mu(d, buf, nbuf, 0);
	132 }