File system stuff.

This commit is contained in:
rsc 2003-12-06 18:08:52 +00:00
parent e97ceade5e
commit d3df308747
29 changed files with 3316 additions and 0 deletions

95
src/lib9/convD2M.c Normal file
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#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;
}

94
src/lib9/convM2D.c Normal file
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#include <u.h>
#include <libc.h>
#include <fcall.h>
int
statcheck(uchar *buf, uint nbuf)
{
uchar *ebuf;
int i;
ebuf = buf + nbuf;
if(nbuf < STATFIXLEN || nbuf != BIT16SZ + GBIT16(buf))
return -1;
buf += STATFIXLEN - 4 * BIT16SZ;
for(i = 0; i < 4; i++){
if(buf + BIT16SZ > ebuf)
return -1;
buf += BIT16SZ + GBIT16(buf);
}
if(buf != ebuf)
return -1;
return 0;
}
static char nullstring[] = "";
uint
convM2D(uchar *buf, uint nbuf, Dir *d, char *strs)
{
uchar *p, *ebuf;
char *sv[4];
int i, ns;
if(nbuf < STATFIXLEN)
return 0;
p = buf;
ebuf = buf + nbuf;
p += BIT16SZ; /* ignore size */
d->type = GBIT16(p);
p += BIT16SZ;
d->dev = GBIT32(p);
p += BIT32SZ;
d->qid.type = GBIT8(p);
p += BIT8SZ;
d->qid.vers = GBIT32(p);
p += BIT32SZ;
d->qid.path = GBIT64(p);
p += BIT64SZ;
d->mode = GBIT32(p);
p += BIT32SZ;
d->atime = GBIT32(p);
p += BIT32SZ;
d->mtime = GBIT32(p);
p += BIT32SZ;
d->length = GBIT64(p);
p += BIT64SZ;
for(i = 0; i < 4; i++){
if(p + BIT16SZ > ebuf)
return 0;
ns = GBIT16(p);
p += BIT16SZ;
if(p + ns > ebuf)
return 0;
if(strs){
sv[i] = strs;
memmove(strs, p, ns);
strs += ns;
*strs++ = '\0';
}
p += ns;
}
if(strs){
d->name = sv[0];
d->uid = sv[1];
d->gid = sv[2];
d->muid = sv[3];
}else{
d->name = nullstring;
d->uid = nullstring;
d->gid = nullstring;
d->muid = nullstring;
}
return p - buf;
}

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src/lib9/convM2S.c Normal file
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#include <u.h>
#include <libc.h>
#include <fcall.h>
static
uchar*
gstring(uchar *p, uchar *ep, char **s)
{
uint n;
if(p+BIT16SZ > ep)
return nil;
n = GBIT16(p);
p += BIT16SZ - 1;
if(p+n+1 > ep)
return nil;
/* move it down, on top of count, to make room for '\0' */
memmove(p, p + 1, n);
p[n] = '\0';
*s = (char*)p;
p += n+1;
return p;
}
static
uchar*
gqid(uchar *p, uchar *ep, Qid *q)
{
if(p+QIDSZ > ep)
return nil;
q->type = GBIT8(p);
p += BIT8SZ;
q->vers = GBIT32(p);
p += BIT32SZ;
q->path = GBIT64(p);
p += BIT64SZ;
return p;
}
/*
* no syntactic checks.
* three causes for error:
* 1. message size field is incorrect
* 2. input buffer too short for its own data (counts too long, etc.)
* 3. too many names or qids
* gqid() and gstring() return nil if they would reach beyond buffer.
* main switch statement checks range and also can fall through
* to test at end of routine.
*/
uint
convM2S(uchar *ap, uint nap, Fcall *f)
{
uchar *p, *ep;
uint i, size;
p = ap;
ep = p + nap;
if(p+BIT32SZ+BIT8SZ+BIT16SZ > ep)
return 0;
size = GBIT32(p);
p += BIT32SZ;
if(size < BIT32SZ+BIT8SZ+BIT16SZ)
return 0;
f->type = GBIT8(p);
p += BIT8SZ;
f->tag = GBIT16(p);
p += BIT16SZ;
switch(f->type)
{
default:
return 0;
case Tversion:
if(p+BIT32SZ > ep)
return 0;
f->msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->version);
break;
case Tflush:
if(p+BIT16SZ > ep)
return 0;
f->oldtag = GBIT16(p);
p += BIT16SZ;
break;
case Tauth:
if(p+BIT32SZ > ep)
return 0;
f->afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->uname);
if(p == nil)
break;
p = gstring(p, ep, &f->aname);
if(p == nil)
break;
break;
case Tattach:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
if(p+BIT32SZ > ep)
return 0;
f->afid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->uname);
if(p == nil)
break;
p = gstring(p, ep, &f->aname);
if(p == nil)
break;
break;
case Twalk:
if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->newfid = GBIT32(p);
p += BIT32SZ;
f->nwname = GBIT16(p);
p += BIT16SZ;
if(f->nwname > MAXWELEM)
return 0;
for(i=0; i<f->nwname; i++){
p = gstring(p, ep, &f->wname[i]);
if(p == nil)
break;
}
break;
case Topen:
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->mode = GBIT8(p);
p += BIT8SZ;
break;
case Tcreate:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->name);
if(p == nil)
break;
if(p+BIT32SZ+BIT8SZ > ep)
return 0;
f->perm = GBIT32(p);
p += BIT32SZ;
f->mode = GBIT8(p);
p += BIT8SZ;
break;
case Tread:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->offset = GBIT64(p);
p += BIT64SZ;
f->count = GBIT32(p);
p += BIT32SZ;
break;
case Twrite:
if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->offset = GBIT64(p);
p += BIT64SZ;
f->count = GBIT32(p);
p += BIT32SZ;
if(p+f->count > ep)
return 0;
f->data = (char*)p;
p += f->count;
break;
case Tclunk:
case Tremove:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Tstat:
if(p+BIT32SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
break;
case Twstat:
if(p+BIT32SZ+BIT16SZ > ep)
return 0;
f->fid = GBIT32(p);
p += BIT32SZ;
f->nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->nstat > ep)
return 0;
f->stat = p;
p += f->nstat;
break;
/*
*/
case Rversion:
if(p+BIT32SZ > ep)
return 0;
f->msize = GBIT32(p);
p += BIT32SZ;
p = gstring(p, ep, &f->version);
break;
case Rerror:
p = gstring(p, ep, &f->ename);
break;
case Rflush:
break;
case Rauth:
p = gqid(p, ep, &f->aqid);
if(p == nil)
break;
break;
case Rattach:
p = gqid(p, ep, &f->qid);
if(p == nil)
break;
break;
case Rwalk:
if(p+BIT16SZ > ep)
return 0;
f->nwqid = GBIT16(p);
p += BIT16SZ;
if(f->nwqid > MAXWELEM)
return 0;
for(i=0; i<f->nwqid; i++){
p = gqid(p, ep, &f->wqid[i]);
if(p == nil)
break;
}
break;
case Ropen:
case Rcreate:
p = gqid(p, ep, &f->qid);
if(p == nil)
break;
if(p+BIT32SZ > ep)
return 0;
f->iounit = GBIT32(p);
p += BIT32SZ;
break;
case Rread:
if(p+BIT32SZ > ep)
return 0;
f->count = GBIT32(p);
p += BIT32SZ;
if(p+f->count > ep)
return 0;
f->data = (char*)p;
p += f->count;
break;
case Rwrite:
if(p+BIT32SZ > ep)
return 0;
f->count = GBIT32(p);
p += BIT32SZ;
break;
case Rclunk:
case Rremove:
break;
case Rstat:
if(p+BIT16SZ > ep)
return 0;
f->nstat = GBIT16(p);
p += BIT16SZ;
if(p+f->nstat > ep)
return 0;
f->stat = p;
p += f->nstat;
break;
case Rwstat:
break;
}
if(p==nil || p>ep)
return 0;
if(ap+size == p)
return size;
return 0;
}

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src/lib9/convS2M.c Normal file
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#include <u.h>
#include <libc.h>
#include <fcall.h>
static
uchar*
pstring(uchar *p, char *s)
{
uint n;
if(s == nil){
PBIT16(p, 0);
p += BIT16SZ;
return p;
}
n = strlen(s);
PBIT16(p, n);
p += BIT16SZ;
memmove(p, s, n);
p += n;
return p;
}
static
uchar*
pqid(uchar *p, Qid *q)
{
PBIT8(p, q->type);
p += BIT8SZ;
PBIT32(p, q->vers);
p += BIT32SZ;
PBIT64(p, q->path);
p += BIT64SZ;
return p;
}
static
uint
stringsz(char *s)
{
if(s == nil)
return BIT16SZ;
return BIT16SZ+strlen(s);
}
uint
sizeS2M(Fcall *f)
{
uint n;
int i;
n = 0;
n += BIT32SZ; /* size */
n += BIT8SZ; /* type */
n += BIT16SZ; /* tag */
switch(f->type)
{
default:
return 0;
case Tversion:
n += BIT32SZ;
n += stringsz(f->version);
break;
case Tflush:
n += BIT16SZ;
break;
case Tauth:
n += BIT32SZ;
n += stringsz(f->uname);
n += stringsz(f->aname);
break;
case Tattach:
n += BIT32SZ;
n += BIT32SZ;
n += stringsz(f->uname);
n += stringsz(f->aname);
break;
case Twalk:
n += BIT32SZ;
n += BIT32SZ;
n += BIT16SZ;
for(i=0; i<f->nwname; i++)
n += stringsz(f->wname[i]);
break;
case Topen:
n += BIT32SZ;
n += BIT8SZ;
break;
case Tcreate:
n += BIT32SZ;
n += stringsz(f->name);
n += BIT32SZ;
n += BIT8SZ;
break;
case Tread:
n += BIT32SZ;
n += BIT64SZ;
n += BIT32SZ;
break;
case Twrite:
n += BIT32SZ;
n += BIT64SZ;
n += BIT32SZ;
n += f->count;
break;
case Tclunk:
case Tremove:
n += BIT32SZ;
break;
case Tstat:
n += BIT32SZ;
break;
case Twstat:
n += BIT32SZ;
n += BIT16SZ;
n += f->nstat;
break;
/*
*/
case Rversion:
n += BIT32SZ;
n += stringsz(f->version);
break;
case Rerror:
n += stringsz(f->ename);
break;
case Rflush:
break;
case Rauth:
n += QIDSZ;
break;
case Rattach:
n += QIDSZ;
break;
case Rwalk:
n += BIT16SZ;
n += f->nwqid*QIDSZ;
break;
case Ropen:
case Rcreate:
n += QIDSZ;
n += BIT32SZ;
break;
case Rread:
n += BIT32SZ;
n += f->count;
break;
case Rwrite:
n += BIT32SZ;
break;
case Rclunk:
break;
case Rremove:
break;
case Rstat:
n += BIT16SZ;
n += f->nstat;
break;
case Rwstat:
break;
}
return n;
}
uint
convS2M(Fcall *f, uchar *ap, uint nap)
{
uchar *p;
uint i, size;
size = sizeS2M(f);
if(size == 0)
return 0;
if(size > nap)
return 0;
p = (uchar*)ap;
PBIT32(p, size);
p += BIT32SZ;
PBIT8(p, f->type);
p += BIT8SZ;
PBIT16(p, f->tag);
p += BIT16SZ;
switch(f->type)
{
default:
return 0;
case Tversion:
PBIT32(p, f->msize);
p += BIT32SZ;
p = pstring(p, f->version);
break;
case Tflush:
PBIT16(p, f->oldtag);
p += BIT16SZ;
break;
case Tauth:
PBIT32(p, f->afid);
p += BIT32SZ;
p = pstring(p, f->uname);
p = pstring(p, f->aname);
break;
case Tattach:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT32(p, f->afid);
p += BIT32SZ;
p = pstring(p, f->uname);
p = pstring(p, f->aname);
break;
case Twalk:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT32(p, f->newfid);
p += BIT32SZ;
PBIT16(p, f->nwname);
p += BIT16SZ;
if(f->nwname > MAXWELEM)
return 0;
for(i=0; i<f->nwname; i++)
p = pstring(p, f->wname[i]);
break;
case Topen:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT8(p, f->mode);
p += BIT8SZ;
break;
case Tcreate:
PBIT32(p, f->fid);
p += BIT32SZ;
p = pstring(p, f->name);
PBIT32(p, f->perm);
p += BIT32SZ;
PBIT8(p, f->mode);
p += BIT8SZ;
break;
case Tread:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT64(p, f->offset);
p += BIT64SZ;
PBIT32(p, f->count);
p += BIT32SZ;
break;
case Twrite:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT64(p, f->offset);
p += BIT64SZ;
PBIT32(p, f->count);
p += BIT32SZ;
memmove(p, f->data, f->count);
p += f->count;
break;
case Tclunk:
case Tremove:
PBIT32(p, f->fid);
p += BIT32SZ;
break;
case Tstat:
PBIT32(p, f->fid);
p += BIT32SZ;
break;
case Twstat:
PBIT32(p, f->fid);
p += BIT32SZ;
PBIT16(p, f->nstat);
p += BIT16SZ;
memmove(p, f->stat, f->nstat);
p += f->nstat;
break;
/*
*/
case Rversion:
PBIT32(p, f->msize);
p += BIT32SZ;
p = pstring(p, f->version);
break;
case Rerror:
p = pstring(p, f->ename);
break;
case Rflush:
break;
case Rauth:
p = pqid(p, &f->aqid);
break;
case Rattach:
p = pqid(p, &f->qid);
break;
case Rwalk:
PBIT16(p, f->nwqid);
p += BIT16SZ;
if(f->nwqid > MAXWELEM)
return 0;
for(i=0; i<f->nwqid; i++)
p = pqid(p, &f->wqid[i]);
break;
case Ropen:
case Rcreate:
p = pqid(p, &f->qid);
PBIT32(p, f->iounit);
p += BIT32SZ;
break;
case Rread:
PBIT32(p, f->count);
p += BIT32SZ;
memmove(p, f->data, f->count);
p += f->count;
break;
case Rwrite:
PBIT32(p, f->count);
p += BIT32SZ;
break;
case Rclunk:
break;
case Rremove:
break;
case Rstat:
PBIT16(p, f->nstat);
p += BIT16SZ;
memmove(p, f->stat, f->nstat);
p += f->nstat;
break;
case Rwstat:
break;
}
if(size != p-ap)
return 0;
return size;
}

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#include <u.h>
#include <libc.h>
#include <fcall.h>
static uint dumpsome(char*, char*, char*, long);
static void fdirconv(char*, char*, Dir*);
static char *qidtype(char*, uchar);
#define QIDFMT "(%.16llux %lud %s)"
int
fcallfmt(Fmt *fmt)
{
Fcall *f;
int fid, type, tag, i;
char buf[512], tmp[200];
char *p, *e;
Dir *d;
Qid *q;
e = buf+sizeof(buf);
f = va_arg(fmt->args, Fcall*);
type = f->type;
fid = f->fid;
tag = f->tag;
switch(type){
case Tversion: /* 100 */
seprint(buf, e, "Tversion tag %ud msize %ud version '%s'", tag, f->msize, f->version);
break;
case Rversion:
seprint(buf, e, "Rversion tag %ud msize %ud version '%s'", tag, f->msize, f->version);
break;
case Tauth: /* 102 */
seprint(buf, e, "Tauth tag %ud afid %d uname %s aname %s", tag,
f->afid, f->uname, f->aname);
break;
case Rauth:
seprint(buf, e, "Rauth tag %ud qid " QIDFMT, tag,
f->aqid.path, f->aqid.vers, qidtype(tmp, f->aqid.type));
break;
case Tattach: /* 104 */
seprint(buf, e, "Tattach tag %ud fid %d afid %d uname %s aname %s", tag,
fid, f->afid, f->uname, f->aname);
break;
case Rattach:
seprint(buf, e, "Rattach tag %ud qid " QIDFMT, tag,
f->qid.path, f->qid.vers, qidtype(tmp, f->qid.type));
break;
case Rerror: /* 107; 106 (Terror) illegal */
seprint(buf, e, "Rerror tag %ud ename %s", tag, f->ename);
break;
case Tflush: /* 108 */
seprint(buf, e, "Tflush tag %ud oldtag %ud", tag, f->oldtag);
break;
case Rflush:
seprint(buf, e, "Rflush tag %ud", tag);
break;
case Twalk: /* 110 */
p = seprint(buf, e, "Twalk tag %ud fid %d newfid %d nwname %d ", tag, fid, f->newfid, f->nwname);
if(f->nwname <= MAXWELEM)
for(i=0; i<f->nwname; i++)
p = seprint(p, e, "%d:%s ", i, f->wname[i]);
break;
case Rwalk:
p = seprint(buf, e, "Rwalk tag %ud nwqid %ud ", tag, f->nwqid);
if(f->nwqid <= MAXWELEM)
for(i=0; i<f->nwqid; i++){
q = &f->wqid[i];
p = seprint(p, e, "%d:" QIDFMT " ", i,
q->path, q->vers, qidtype(tmp, q->type));
}
break;
case Topen: /* 112 */
seprint(buf, e, "Topen tag %ud fid %ud mode %d", tag, fid, f->mode);
break;
case Ropen:
seprint(buf, e, "Ropen tag %ud qid " QIDFMT " iounit %ud ", tag,
f->qid.path, f->qid.vers, qidtype(tmp, f->qid.type), f->iounit);
break;
case Tcreate: /* 114 */
seprint(buf, e, "Tcreate tag %ud fid %ud name %s perm %M mode %d", tag, fid, f->name, (ulong)f->perm, f->mode);
break;
case Rcreate:
seprint(buf, e, "Rcreate tag %ud qid " QIDFMT " iounit %ud ", tag,
f->qid.path, f->qid.vers, qidtype(tmp, f->qid.type), f->iounit);
break;
case Tread: /* 116 */
seprint(buf, e, "Tread tag %ud fid %d offset %lld count %ud",
tag, fid, f->offset, f->count);
break;
case Rread:
p = seprint(buf, e, "Rread tag %ud count %ud ", tag, f->count);
dumpsome(p, e, f->data, f->count);
break;
case Twrite: /* 118 */
p = seprint(buf, e, "Twrite tag %ud fid %d offset %lld count %ud ",
tag, fid, f->offset, f->count);
dumpsome(p, e, f->data, f->count);
break;
case Rwrite:
seprint(buf, e, "Rwrite tag %ud count %ud", tag, f->count);
break;
case Tclunk: /* 120 */
seprint(buf, e, "Tclunk tag %ud fid %ud", tag, fid);
break;
case Rclunk:
seprint(buf, e, "Rclunk tag %ud", tag);
break;
case Tremove: /* 122 */
seprint(buf, e, "Tremove tag %ud fid %ud", tag, fid);
break;
case Rremove:
seprint(buf, e, "Rremove tag %ud", tag);
break;
case Tstat: /* 124 */
seprint(buf, e, "Tstat tag %ud fid %ud", tag, fid);
break;
case Rstat:
p = seprint(buf, e, "Rstat tag %ud ", tag);
if(f->nstat > sizeof tmp)
seprint(p, e, " stat(%d bytes)", f->nstat);
else{
d = (Dir*)tmp;
convM2D(f->stat, f->nstat, d, (char*)(d+1));
seprint(p, e, " stat ");
fdirconv(p+6, e, d);
}
break;
case Twstat: /* 126 */
p = seprint(buf, e, "Twstat tag %ud fid %ud", tag, fid);
if(f->nstat > sizeof tmp)
seprint(p, e, " stat(%d bytes)", f->nstat);
else{
d = (Dir*)tmp;
convM2D(f->stat, f->nstat, d, (char*)(d+1));
seprint(p, e, " stat ");
fdirconv(p+6, e, d);
}
break;
case Rwstat:
seprint(buf, e, "Rwstat tag %ud", tag);
break;
default:
seprint(buf, e, "unknown type %d", type);
}
return fmtstrcpy(fmt, buf);
}
static char*
qidtype(char *s, uchar t)
{
char *p;
p = s;
if(t & QTDIR)
*p++ = 'd';
if(t & QTAPPEND)
*p++ = 'a';
if(t & QTEXCL)
*p++ = 'l';
if(t & QTAUTH)
*p++ = 'A';
*p = '\0';
return s;
}
int
dirfmt(Fmt *fmt)
{
char buf[160];
fdirconv(buf, buf+sizeof buf, va_arg(fmt->args, Dir*));
return fmtstrcpy(fmt, buf);
}
static void
fdirconv(char *buf, char *e, Dir *d)
{
char tmp[16];
seprint(buf, e, "'%s' '%s' '%s' '%s' "
"q " QIDFMT " m %#luo "
"at %ld mt %ld l %lld "
"t %d d %d",
d->name, d->uid, d->gid, d->muid,
d->qid.path, d->qid.vers, qidtype(tmp, d->qid.type), d->mode,
d->atime, d->mtime, d->length,
d->type, d->dev);
}
/*
* dump out count (or DUMPL, if count is bigger) bytes from
* buf to ans, as a string if they are all printable,
* else as a series of hex bytes
*/
#define DUMPL 64
static uint
dumpsome(char *ans, char *e, char *buf, long count)
{
int i, printable;
char *p;
if(buf == nil){
seprint(ans, e, "<no data>");
return strlen(ans);
}
printable = 1;
if(count > DUMPL)
count = DUMPL;
for(i=0; i<count && printable; i++)
if((buf[i]<32 && buf[i] !='\n' && buf[i] !='\t') || (uchar)buf[i]>127)
printable = 0;
p = ans;
*p++ = '\'';
if(printable){
if(count > e-p-2)
count = e-p-2;
memmove(p, buf, count);
p += count;
}else{
if(2*count > e-p-2)
count = (e-p-2)/2;
for(i=0; i<count; i++){
if(i>0 && i%4==0)
*p++ = ' ';
sprint(p, "%2.2ux", buf[i]);
p += 2;
}
}
*p++ = '\'';
*p = 0;
return p - ans;
}

31
src/lib9/read9pmsg.c Normal file
View file

@ -0,0 +1,31 @@
#include <u.h>
#include <libc.h>
#include <fcall.h>
int
read9pmsg(int fd, void *abuf, uint n)
{
int m, len;
uchar *buf;
buf = abuf;
/* read count */
m = readn(fd, buf, BIT32SZ);
if(m != BIT32SZ){
if(m < 0)
return -1;
return 0;
}
len = GBIT32(buf);
if(len <= BIT32SZ || len > n){
werrstr("bad length in 9P2000 message header");
return -1;
}
len -= BIT32SZ;
m = readn(fd, buf+BIT32SZ, len);
if(m < len)
return 0;
return BIT32SZ+m;
}