src/lib9/_p9dir.c - go - Git at Google

 /*
 Plan 9 from User Space src/lib9/_p9dir.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/_p9dir.c

 Copyright 2001-2007 Russ Cox.  All Rights Reserved.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */

 #include <u.h>
 #define NOPLAN9DEFINES
 #include <libc.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
 #include <pwd.h>
 #include <grp.h>

 #if defined(__FreeBSD__)
 #include <sys/disk.h>
 #include <sys/disklabel.h>
 #include <sys/ioctl.h>
 #endif

 #if defined(__OpenBSD__)
 #include <sys/disklabel.h>
 #include <sys/ioctl.h>
 #define _HAVEDISKLABEL
 static int diskdev[] = {
 	151,	/* aacd */
 	116,	/* ad */
 	157,	/* ar */
 	118,	/* afd */
 	133,	/* amrd */
 	13,	/* da */
 	102,	/* fla */
 	109,	/* idad */
 	95,	/* md */
 	131,	/* mlxd */
 	168,	/* pst */
 	147,	/* twed */
 	43,	/* vn */
 	3,	/* wd */
 	87,	/* wfd */
 	4,	/* da on FreeBSD 5 */
 };
 static int
 isdisk(struct stat *st)
 {
 	int i, dev;

 	if(!S_ISCHR(st->st_mode))
 		return 0;
 	dev = major(st->st_rdev);
 	for(i=0; i<nelem(diskdev); i++)
 		if(diskdev[i] == dev)
 			return 1;
 	return 0;
 }
 #endif

 #if defined(__FreeBSD__)	/* maybe OpenBSD too? */
 char *diskdev[] = {
 	"aacd",
 	"ad",
 	"ar",
 	"afd",
 	"amrd",
 	"da",
 	"fla",
 	"idad",
 	"md",
 	"mlxd",
 	"pst",
 	"twed",
 	"vn",
 	"wd",
 	"wfd",
 	"da",
 };
 static int
 isdisk(struct stat *st)
 {
 	char *name;
 	int i, len;

 	if(!S_ISCHR(st->st_mode))
 		return 0;
 	name = devname(st->st_rdev, S_IFCHR);
 	for(i=0; i<nelem(diskdev); i++){
 		len = strlen(diskdev[i]);
 		if(strncmp(diskdev[i], name, len) == 0 && isdigit((uchar)name[len]))
 			return 1;
 	}
 	return 0;
 }
 #endif


 #if defined(__linux__)
 #include <linux/hdreg.h>
 #include <linux/fs.h>
 #include <sys/ioctl.h>
 #undef major
 #define major(dev) ((int)(((dev) >> 8) & 0xff))
 static vlong
 disksize(int fd, int dev)
 {
 	u64int u64;
 	long l;
 	struct hd_geometry geo;

 	memset(&geo, 0, sizeof geo);
 	l = 0;
 	u64 = 0;
 #ifdef BLKGETSIZE64
 	if(ioctl(fd, BLKGETSIZE64, &u64) >= 0)
 		return u64;
 #endif
 	if(ioctl(fd, BLKGETSIZE, &l) >= 0)
 		return l*512;
 	if(ioctl(fd, HDIO_GETGEO, &geo) >= 0)
 		return (vlong)geo.heads*geo.sectors*geo.cylinders*512;
 	return 0;
 }
 #define _HAVEDISKSIZE
 #endif

 #if !defined(__linux__) && !defined(__sun__)
 #define _HAVESTGEN
 #endif

 int _p9usepwlibrary = 1;
 /*
  * Caching the last group and passwd looked up is
  * a significant win (stupidly enough) on most systems.
  * It's not safe for threaded programs, but neither is using
  * getpwnam in the first place, so I'm not too worried.
  */
 int
 _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *estr)
 {
 	char *s;
 	char tmp[20];
 	static struct group *g;
 	static struct passwd *p;
 	static int gid, uid;
 	int sz, fd;

 	fd = -1;
 	USED(fd);
 	sz = 0;
 	if(d)
 		memset(d, 0, sizeof *d);

 	/* name */
 	s = strrchr(name, '/');
 	if(s)
 		s++;
 	if(!s || !*s)
 		s = name;
 	if(*s == '/')
 		s++;
 	if(*s == 0)
 		s = "/";
 	if(d){
 		if(*str + strlen(s)+1 > estr)
 			d->name = "oops";
 		else{
 			strcpy(*str, s);
 			d->name = *str;
 			*str += strlen(*str)+1;
 		}
 	}
 	sz += strlen(s)+1;

 	/* user */
 	if(p && st->st_uid == uid && p->pw_uid == uid)
 		;
 	else if(_p9usepwlibrary){
 		p = getpwuid(st->st_uid);
 		uid = st->st_uid;
 	}
 	if(p == nil || st->st_uid != uid || p->pw_uid != uid){
 		snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
 		s = tmp;
 	}else
 		s = p->pw_name;
 	sz += strlen(s)+1;
 	if(d){
 		if(*str+strlen(s)+1 > estr)
 			d->uid = "oops";
 		else{
 			strcpy(*str, s);
 			d->uid = *str;
 			*str += strlen(*str)+1;
 		}
 	}

 	/* group */
 	if(g && st->st_gid == gid && g->gr_gid == gid)
 		;
 	else if(_p9usepwlibrary){
 		g = getgrgid(st->st_gid);
 		gid = st->st_gid;
 	}
 	if(g == nil || st->st_gid != gid || g->gr_gid != gid){
 		snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
 		s = tmp;
 	}else
 		s = g->gr_name;
 	sz += strlen(s)+1;
 	if(d){
 		if(*str + strlen(s)+1 > estr)
 			d->gid = "oops";
 		else{
 			strcpy(*str, s);
 			d->gid = *str;
 			*str += strlen(*str)+1;
 		}
 	}

 	if(d){
 		d->type = 'M';

 		d->muid = "";
 		d->qid.path = ((uvlong)st->st_dev<<32) | st->st_ino;
 #ifdef _HAVESTGEN
 		d->qid.vers = st->st_gen;
 #endif
 		if(d->qid.vers == 0)
 			d->qid.vers = st->st_mtime + st->st_ctime;
 		d->mode = st->st_mode&0777;
 		d->atime = st->st_atime;
 		d->mtime = st->st_mtime;
 		d->length = st->st_size;

 		if(S_ISDIR(st->st_mode)){
 			d->length = 0;
 			d->mode |= DMDIR;
 			d->qid.type = QTDIR;
 		}
 		if(S_ISLNK(lst->st_mode))	/* yes, lst not st */
 			d->mode |= DMSYMLINK;
 		if(S_ISFIFO(st->st_mode))
 			d->mode |= DMNAMEDPIPE;
 		if(S_ISSOCK(st->st_mode))
 			d->mode |= DMSOCKET;
 		if(S_ISBLK(st->st_mode)){
 			d->mode |= DMDEVICE;
 			d->qid.path = ('b'<<16)|st->st_rdev;
 		}
 		if(S_ISCHR(st->st_mode)){
 			d->mode |= DMDEVICE;
 			d->qid.path = ('c'<<16)|st->st_rdev;
 		}
 		/* fetch real size for disks */
 #ifdef _HAVEDISKSIZE
 		if(S_ISBLK(st->st_mode) && (fd = open(name, O_RDONLY)) >= 0){
 			d->length = disksize(fd, major(st->st_dev));
 			close(fd);
 		}
 #endif
 #if defined(DIOCGMEDIASIZE)
 		if(isdisk(st)){
 			int fd;
 			off_t mediasize;

 			if((fd = open(name, O_RDONLY)) >= 0){
 				if(ioctl(fd, DIOCGMEDIASIZE, &mediasize) >= 0)
 					d->length = mediasize;
 				close(fd);
 			}
 		}
 #elif defined(_HAVEDISKLABEL)
 		if(isdisk(st)){
 			int fd, n;
 			struct disklabel lab;

 			if((fd = open(name, O_RDONLY)) < 0)
 				goto nosize;
 			if(ioctl(fd, DIOCGDINFO, &lab) < 0)
 				goto nosize;
 			n = minor(st->st_rdev)&7;
 			if(n >= lab.d_npartitions)
 				goto nosize;

 			d->length = (vlong)(lab.d_partitions[n].p_size) * lab.d_secsize;

 		nosize:
 			if(fd >= 0)
 				close(fd);
 		}
 #endif
 	}

 	return sz;
 }
	/*
	Plan 9 from User Space src/lib9/_p9dir.c
	http://code.swtch.com/plan9port/src/tip/src/lib9/_p9dir.c

	Copyright 2001-2007 Russ Cox. All Rights Reserved.

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	THE SOFTWARE.
	*/

	#include <u.h>
	#define NOPLAN9DEFINES
	#include <libc.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <dirent.h>
	#include <pwd.h>
	#include <grp.h>

	#if defined(__FreeBSD__)
	#include <sys/disk.h>
	#include <sys/disklabel.h>
	#include <sys/ioctl.h>
	#endif

	#if defined(__OpenBSD__)
	#include <sys/disklabel.h>
	#include <sys/ioctl.h>
	#define _HAVEDISKLABEL
	static int diskdev[] = {
	151, /* aacd */
	116, /* ad */
	157, /* ar */
	118, /* afd */
	133, /* amrd */
	13, /* da */
	102, /* fla */
	109, /* idad */
	95, /* md */
	131, /* mlxd */
	168, /* pst */
	147, /* twed */
	43, /* vn */
	3, /* wd */
	87, /* wfd */
	4, /* da on FreeBSD 5 */
	};
	static int
	isdisk(struct stat *st)
	{
	int i, dev;

	if(!S_ISCHR(st->st_mode))
	return 0;
	dev = major(st->st_rdev);
	for(i=0; i<nelem(diskdev); i++)
	if(diskdev[i] == dev)
	return 1;
	return 0;
	}
	#endif

	#if defined(__FreeBSD__) /* maybe OpenBSD too? */
	char *diskdev[] = {
	"aacd",
	"ad",
	"ar",
	"afd",
	"amrd",
	"da",
	"fla",
	"idad",
	"md",
	"mlxd",
	"pst",
	"twed",
	"vn",
	"wd",
	"wfd",
	"da",
	};
	static int
	isdisk(struct stat *st)
	{
	char *name;
	int i, len;

	if(!S_ISCHR(st->st_mode))
	return 0;
	name = devname(st->st_rdev, S_IFCHR);
	for(i=0; i<nelem(diskdev); i++){
	len = strlen(diskdev[i]);
	if(strncmp(diskdev[i], name, len) == 0 && isdigit((uchar)name[len]))
	return 1;
	}
	return 0;
	}
	#endif


	#if defined(__linux__)
	#include <linux/hdreg.h>
	#include <linux/fs.h>
	#include <sys/ioctl.h>
	#undef major
	#define major(dev) ((int)(((dev) >> 8) & 0xff))
	static vlong
	disksize(int fd, int dev)
	{
	u64int u64;
	long l;
	struct hd_geometry geo;

	memset(&geo, 0, sizeof geo);
	l = 0;
	u64 = 0;
	#ifdef BLKGETSIZE64
	if(ioctl(fd, BLKGETSIZE64, &u64) >= 0)
	return u64;
	#endif
	if(ioctl(fd, BLKGETSIZE, &l) >= 0)
	return l*512;
	if(ioctl(fd, HDIO_GETGEO, &geo) >= 0)
	return (vlong)geo.headsgeo.sectorsgeo.cylinders*512;
	return 0;
	}
	#define _HAVEDISKSIZE
	#endif

	#if !defined(__linux__) && !defined(__sun__)
	#define _HAVESTGEN
	#endif

	int _p9usepwlibrary = 1;
	/*
	* Caching the last group and passwd looked up is
	* a significant win (stupidly enough) on most systems.
	* It's not safe for threaded programs, but neither is using
	* getpwnam in the first place, so I'm not too worried.
	*/
	int
	_p9dir(struct stat lst, struct stat st, char name, Dir d, char *str, char estr)
	{
	char *s;
	char tmp[20];
	static struct group *g;
	static struct passwd *p;
	static int gid, uid;
	int sz, fd;

	fd = -1;
	USED(fd);
	sz = 0;
	if(d)
	memset(d, 0, sizeof *d);

	/* name */
	s = strrchr(name, '/');
	if(s)
	s++;
	if(!s \|\| !*s)
	s = name;
	if(*s == '/')
	s++;
	if(*s == 0)
	s = "/";
	if(d){
	if(*str + strlen(s)+1 > estr)
	d->name = "oops";
	else{
	strcpy(*str, s);
	d->name = *str;
	str += strlen(str)+1;
	}
	}
	sz += strlen(s)+1;

	/* user */
	if(p && st->st_uid == uid && p->pw_uid == uid)
	;
	else if(_p9usepwlibrary){
	p = getpwuid(st->st_uid);
	uid = st->st_uid;
	}
	if(p == nil \|\| st->st_uid != uid \|\| p->pw_uid != uid){
	snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
	s = tmp;
	}else
	s = p->pw_name;
	sz += strlen(s)+1;
	if(d){
	if(*str+strlen(s)+1 > estr)
	d->uid = "oops";
	else{
	strcpy(*str, s);
	d->uid = *str;
	str += strlen(str)+1;
	}
	}

	/* group */
	if(g && st->st_gid == gid && g->gr_gid == gid)
	;
	else if(_p9usepwlibrary){
	g = getgrgid(st->st_gid);
	gid = st->st_gid;
	}
	if(g == nil \|\| st->st_gid != gid \|\| g->gr_gid != gid){
	snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
	s = tmp;
	}else
	s = g->gr_name;
	sz += strlen(s)+1;
	if(d){
	if(*str + strlen(s)+1 > estr)
	d->gid = "oops";
	else{
	strcpy(*str, s);
	d->gid = *str;
	str += strlen(str)+1;
	}
	}

	if(d){
	d->type = 'M';

	d->muid = "";
	d->qid.path = ((uvlong)st->st_dev<<32) \| st->st_ino;
	#ifdef _HAVESTGEN
	d->qid.vers = st->st_gen;
	#endif
	if(d->qid.vers == 0)
	d->qid.vers = st->st_mtime + st->st_ctime;
	d->mode = st->st_mode&0777;
	d->atime = st->st_atime;
	d->mtime = st->st_mtime;
	d->length = st->st_size;

	if(S_ISDIR(st->st_mode)){
	d->length = 0;
	d->mode \|= DMDIR;
	d->qid.type = QTDIR;
	}
	if(S_ISLNK(lst->st_mode)) /* yes, lst not st */
	d->mode \|= DMSYMLINK;
	if(S_ISFIFO(st->st_mode))
	d->mode \|= DMNAMEDPIPE;
	if(S_ISSOCK(st->st_mode))
	d->mode \|= DMSOCKET;
	if(S_ISBLK(st->st_mode)){
	d->mode \|= DMDEVICE;
	d->qid.path = ('b'<<16)\|st->st_rdev;
	}
	if(S_ISCHR(st->st_mode)){
	d->mode \|= DMDEVICE;
	d->qid.path = ('c'<<16)\|st->st_rdev;
	}
	/* fetch real size for disks */
	#ifdef _HAVEDISKSIZE
	if(S_ISBLK(st->st_mode) && (fd = open(name, O_RDONLY)) >= 0){
	d->length = disksize(fd, major(st->st_dev));
	close(fd);
	}
	#endif
	#if defined(DIOCGMEDIASIZE)
	if(isdisk(st)){
	int fd;
	off_t mediasize;

	if((fd = open(name, O_RDONLY)) >= 0){
	if(ioctl(fd, DIOCGMEDIASIZE, &mediasize) >= 0)
	d->length = mediasize;
	close(fd);
	}
	}
	#elif defined(_HAVEDISKLABEL)
	if(isdisk(st)){
	int fd, n;
	struct disklabel lab;

	if((fd = open(name, O_RDONLY)) < 0)
	goto nosize;
	if(ioctl(fd, DIOCGDINFO, &lab) < 0)
	goto nosize;
	n = minor(st->st_rdev)&7;
	if(n >= lab.d_npartitions)
	goto nosize;

	d->length = (vlong)(lab.d_partitions[n].p_size) * lab.d_secsize;

	nosize:
	if(fd >= 0)
	close(fd);
	}
	#endif
	}

	return sz;
	}