ref: e33e667369270ef94daaacd5461e28ee4b57d34d
dir: /libc/convD2M.c/
#include <u.h>
#include <libc.h>
#include <fcall.h>
uint
sizeD2M(Dir *d)
{
char *sv[4];
int i, ns;
sv[0] = d->name;
sv[1] = d->uid;
sv[2] = d->gid;
sv[3] = d->muid;
ns = 0;
for(i = 0; i < 4; i++)
if(sv[i])
ns += strlen(sv[i]);
return STATFIXLEN + ns;
}
uint
convD2M(Dir *d, uchar *buf, uint nbuf)
{
uchar *p, *ebuf;
char *sv[4];
int i, ns, nsv[4], ss;
if(nbuf < BIT16SZ)
return 0;
p = buf;
ebuf = buf + nbuf;
sv[0] = d->name;
sv[1] = d->uid;
sv[2] = d->gid;
sv[3] = d->muid;
ns = 0;
for(i = 0; i < 4; i++){
if(sv[i])
nsv[i] = strlen(sv[i]);
else
nsv[i] = 0;
ns += nsv[i];
}
ss = STATFIXLEN + ns;
/* set size befor erroring, so user can know how much is needed */
/* note that length excludes count field itself */
PBIT16(p, ss-BIT16SZ);
p += BIT16SZ;
if(ss > nbuf)
return BIT16SZ;
PBIT16(p, d->type);
p += BIT16SZ;
PBIT32(p, d->dev);
p += BIT32SZ;
PBIT8(p, d->qid.type);
p += BIT8SZ;
PBIT32(p, d->qid.vers);
p += BIT32SZ;
PBIT64(p, d->qid.path);
p += BIT64SZ;
PBIT32(p, d->mode);
p += BIT32SZ;
PBIT32(p, d->atime);
p += BIT32SZ;
PBIT32(p, d->mtime);
p += BIT32SZ;
PBIT64(p, d->length);
p += BIT64SZ;
for(i = 0; i < 4; i++){
ns = nsv[i];
if(p + ns + BIT16SZ > ebuf)
return 0;
PBIT16(p, ns);
p += BIT16SZ;
if(ns)
memmove(p, sv[i], ns);
p += ns;
}
if(ss != p - buf)
return 0;
return p - buf;
}