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#include <u.h>
#define NOPLAN9DEFINES
#include <libc.h>
#include <sys/stat.h>
#include <dirent.h>
extern int _p9dir(struct stat*, char*, Dir*, char**, char*);
#if defined(__linux__)
static int
mygetdents(int fd, struct dirent *buf, int n)
{
off_t off;
int nn;
/* This doesn't match the man page, but it works in Debian with a 2.2 kernel */
off = p9seek(fd, 0, 1);
nn = getdirentries(fd, (void*)buf, n, &off);
return nn;
}
#elif defined(__APPLE__) || defined(__FreeBSD__)
static int
mygetdents(int fd, struct dirent *buf, int n)
{
long off;
return getdirentries(fd, (void*)buf, n, &off);
}
#elif defined(__sun__)
static int
mygetdents(int fd, struct dirent *buf, int n)
{
return getdents(fd, (void*)buf, n);
}
#endif
static int
countde(char *p, int n)
{
char *e;
int m;
struct dirent *de;
e = p+n;
m = 0;
while(p < e){
de = (struct dirent*)p;
if(de->d_reclen <= 4+2+2+1 || p+de->d_reclen > e)
break;
if(de->d_name[0]=='.' && de->d_name[1]==0)
de->d_name[0] = 0;
else if(de->d_name[0]=='.' && de->d_name[1]=='.' && de->d_name[2]==0)
de->d_name[0] = 0;
m++;
p += de->d_reclen;
}
return m;
}
static int
dirpackage(int fd, char *buf, int n, Dir **dp)
{
int oldwd;
char *p, *str, *estr;
int i, nstr, m;
struct dirent *de;
struct stat st;
Dir *d;
n = countde(buf, n);
if(n <= 0)
return n;
if((oldwd = open(".", O_RDONLY)) < 0)
return -1;
if(fchdir(fd) < 0)
return -1;
p = buf;
nstr = 0;
for(i=0; i<n; i++){
de = (struct dirent*)p;
if(de->d_name[0] == 0)
/* nothing */ {}
else if(stat(de->d_name, &st) < 0)
de->d_name[0] = 0;
else
nstr += _p9dir(&st, de->d_name, nil, nil, nil);
p += de->d_reclen;
}
d = malloc(sizeof(Dir)*n+nstr);
if(d == nil){
fchdir(oldwd);
close(oldwd);
return -1;
}
str = (char*)&d[n];
estr = str+nstr;
p = buf;
m = 0;
for(i=0; i<n; i++){
de = (struct dirent*)p;
if(de->d_name[0] != 0 && stat(de->d_name, &st) >= 0)
_p9dir(&st, de->d_name, &d[m++], &str, estr);
p += de->d_reclen;
}
fchdir(oldwd);
close(oldwd);
*dp = d;
return m;
}
long
dirread(int fd, Dir **dp)
{
char *buf;
struct stat st;
int n;
*dp = 0;
if(fstat(fd, &st) < 0)
return -1;
if(st.st_blksize < 8192)
st.st_blksize = 8192;
buf = malloc(st.st_blksize);
if(buf == nil)
return -1;
n = mygetdents(fd, (void*)buf, st.st_blksize);
if(n < 0){
free(buf);
return -1;
}
n = dirpackage(fd, buf, n, dp);
free(buf);
return n;
}
long
dirreadall(int fd, Dir **d)
{
uchar *buf, *nbuf;
long n, ts;
struct stat st;
if(fstat(fd, &st) < 0)
return -1;
if(st.st_blksize < 8192)
st.st_blksize = 8192;
buf = nil;
ts = 0;
for(;;){
nbuf = realloc(buf, ts+st.st_blksize);
if(nbuf == nil){
free(buf);
return -1;
}
buf = nbuf;
n = mygetdents(fd, (void*)(buf+ts), st.st_blksize);
if(n <= 0)
break;
ts += n;
}
if(ts >= 0)
ts = dirpackage(fd, buf, ts, d);
free(buf);
if(ts == 0 && n < 0)
return -1;
return ts;
}
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