github.com/rohankumardubey/syslog-redirector-golang@v0.0.0-20140320174030-4859f03d829a/src/lib9/_p9dir.c (about)

     1  /*
     2  Plan 9 from User Space src/lib9/_p9dir.c
     3  http://code.swtch.com/plan9port/src/tip/src/lib9/_p9dir.c
     4  
     5  Copyright 2001-2007 Russ Cox.  All Rights Reserved.
     6  
     7  Permission is hereby granted, free of charge, to any person obtaining a copy
     8  of this software and associated documentation files (the "Software"), to deal
     9  in the Software without restriction, including without limitation the rights
    10  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    11  copies of the Software, and to permit persons to whom the Software is
    12  furnished to do so, subject to the following conditions:
    13  
    14  The above copyright notice and this permission notice shall be included in
    15  all copies or substantial portions of the Software.
    16  
    17  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    18  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    19  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    20  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    21  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    22  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    23  THE SOFTWARE.
    24  */
    25  
    26  #include <u.h>
    27  #define NOPLAN9DEFINES
    28  #include <libc.h>
    29  #include <sys/types.h>
    30  #include <sys/stat.h>
    31  #include <dirent.h>
    32  
    33  /*
    34   * Caching the last group and passwd looked up is
    35   * a significant win (stupidly enough) on most systems.
    36   * It's not safe for threaded programs, but neither is using
    37   * getpwnam in the first place, so I'm not too worried.
    38   */
    39  int
    40  _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *estr)
    41  {
    42  	char *s;
    43  	char tmp[20];
    44  	int sz, fd;
    45  
    46  #ifdef _WIN32
    47  	USED(lst);
    48  #endif
    49  	fd = -1;
    50  	USED(fd);
    51  	sz = 0;
    52  	if(d)
    53  		memset(d, 0, sizeof *d);
    54  
    55  	/* name */
    56  	s = strrchr(name, '/');
    57  	if(s)
    58  		s++;
    59  	if(!s || !*s)
    60  		s = name;
    61  	if(*s == '/')
    62  		s++;
    63  	if(*s == 0)
    64  		s = "/";
    65  	if(d){
    66  		if(*str + strlen(s)+1 > estr)
    67  			d->name = "oops";
    68  		else{
    69  			strcpy(*str, s);
    70  			d->name = *str;
    71  			*str += strlen(*str)+1;
    72  		}
    73  	}
    74  	sz += (int)strlen(s)+1;
    75  
    76  	/* user */
    77  	snprint(tmp, sizeof tmp, "%d", (int)st->st_uid);
    78  	s = tmp;
    79  	sz += (int)strlen(s)+1;
    80  	if(d){
    81  		if(*str+strlen(s)+1 > estr)
    82  			d->uid = "oops";
    83  		else{
    84  			strcpy(*str, s);
    85  			d->uid = *str;
    86  			*str += strlen(*str)+1;
    87  		}
    88  	}
    89  
    90  	/* group */
    91  	snprint(tmp, sizeof tmp, "%d", (int)st->st_gid);
    92  	s = tmp;
    93  	sz += (int)strlen(s)+1;
    94  	if(d){
    95  		if(*str + strlen(s)+1 > estr)
    96  			d->gid = "oops";
    97  		else{
    98  			strcpy(*str, s);
    99  			d->gid = *str;
   100  			*str += strlen(*str)+1;
   101  		}
   102  	}
   103  
   104  	if(d){
   105  		d->type = 'M';
   106  
   107  		d->muid = "";
   108  		d->qid.path = ((uvlong)st->st_dev<<32) | st->st_ino;
   109  #ifdef _HAVESTGEN
   110  		d->qid.vers = st->st_gen;
   111  #endif
   112  		if(d->qid.vers == 0)
   113  			d->qid.vers = (ulong)(st->st_mtime + st->st_ctime);
   114  		d->mode = st->st_mode&0777;
   115  		d->atime = (ulong)st->st_atime;
   116  		d->mtime = (ulong)st->st_mtime;
   117  		d->length = st->st_size;
   118  
   119  		if(S_ISDIR(st->st_mode)){
   120  			d->length = 0;
   121  			d->mode |= DMDIR;
   122  			d->qid.type = QTDIR;
   123  		}
   124  #ifdef S_ISLNK
   125  		if(S_ISLNK(lst->st_mode))	/* yes, lst not st */
   126  			d->mode |= DMSYMLINK;
   127  #endif
   128  		if(S_ISFIFO(st->st_mode))
   129  			d->mode |= DMNAMEDPIPE;
   130  #ifdef S_ISSOCK
   131  		if(S_ISSOCK(st->st_mode))
   132  			d->mode |= DMSOCKET;
   133  #endif
   134  		if(S_ISBLK(st->st_mode)){
   135  			d->mode |= DMDEVICE;
   136  			d->qid.path = ('b'<<16)|st->st_rdev;
   137  		}
   138  		if(S_ISCHR(st->st_mode)){
   139  			d->mode |= DMDEVICE;
   140  			d->qid.path = ('c'<<16)|st->st_rdev;
   141  		}
   142  		/* fetch real size for disks */
   143  		if(S_ISBLK(st->st_mode) && (fd = open(name, O_RDONLY)) >= 0){
   144  			d->length = 0;
   145  			close(fd);
   146  		}
   147  #if defined(DIOCGMEDIASIZE)
   148  		if(isdisk(st)){
   149  			int fd;
   150  			off_t mediasize;
   151  
   152  			if((fd = open(name, O_RDONLY)) >= 0){
   153  				if(ioctl(fd, DIOCGMEDIASIZE, &mediasize) >= 0)
   154  					d->length = mediasize;
   155  				close(fd);
   156  			}
   157  		}
   158  #elif defined(_HAVEDISKLABEL)
   159  		if(isdisk(st)){
   160  			int fd, n;
   161  			struct disklabel lab;
   162  
   163  			if((fd = open(name, O_RDONLY)) < 0)
   164  				goto nosize;
   165  			if(ioctl(fd, DIOCGDINFO, &lab) < 0)
   166  				goto nosize;
   167  			n = minor(st->st_rdev)&7;
   168  			if(n >= lab.d_npartitions)
   169  				goto nosize;
   170  
   171  			d->length = (vlong)(lab.d_partitions[n].p_size) * lab.d_secsize;
   172  
   173  		nosize:
   174  			if(fd >= 0)
   175  				close(fd);
   176  		}
   177  #endif
   178  	}
   179  
   180  	return sz;
   181  }
   182