external/bsd/pcc/dist/pcc-libs/libI77/pwd.c

   1 /*      $Id: pwd.c,v 1.1.1.1 2008/08/24 05:34:47 gmcgarry Exp $ */
   2 /*
   3  * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * Redistributions of source code and documentation must retain the above
  10  * copyright notice, this list of conditions and the following disclaimer.
  11  * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditionsand the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  * All advertising materials mentioning features or use of this software
  15  * must display the following acknowledgement:
  16  *      This product includes software developed or owned by Caldera
  17  *      International, Inc.
  18  * Neither the name of Caldera International, Inc. nor the names of other
  19  * contributors may be used to endorse or promote products derived from
  20  * this software without specific prior written permission.
  21  *
  22  * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
  23  * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  * DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OFLIABILITY, WHETHER IN CONTRACT,
  31  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  32  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 /*
  36  * Print working (current) directory
  37  */
  38 #include        <sys/types.h>
  39 #include        <sys/stat.h>
  40 #include        <sys/dir.h>
  41
  42 char    dot[]   ".";
  43 char    dotdot[]        "..";
  44 char    root[]  "/";
  45 char    name[512];
  46 int     file;
  47 int     off     -1;
  48 struct  stat    x;
  49 struct  direct  y;
  50
  51 main()
  52 {
  53         for (;;) {
  54                 stat(dot, &x);
  55                 if ((file = open(dotdot,0)) < 0) prname();
  56                 do {
  57                         if (read(file, &y, sizeof(y)) < sizeof(y))
  58                                 prname();
  59                 } while (y.d_ino != x.st_ino);
  60                 close(file);
  61                 if (y.d_ino == 2)
  62                         ckroot();
  63                 cat();
  64                 chdir(dotdot);
  65         }
  66 }
  67
  68 ckroot()
  69 {
  70         register i;
  71
  72         if (stat(y.d_name,&x)<0 || chdir(root)<0 || (file=open(root,0))<0)
  73                 prname();
  74         i = x.st_dev;
  75         do {
  76                 if (read(file,&y,sizeof(y)) < sizeof(y))
  77                         prname();
  78                 if (y.d_ino == 0)
  79                         continue;
  80                 if (stat(y.d_name,&x) < 0)
  81                         prname();
  82         } while (x.st_dev!=i || (x.st_mode&S_IFMT)!=S_IFDIR);
  83         if (strcmp(dot, y.d_name) || strcmp(dotdot, y.d_name))
  84                 cat();
  85         write(1, root, 1);
  86         prname();
  87 }
  88
  89 prname()
  90 {
  91         if (off<0)
  92                 off = 0;
  93         name[off] = '\n';
  94         write(1, name, off+1);
  95         exit(0);
  96 }
  97
  98 cat()
  99 {
 100         register i, j;
 101
 102         i = -1;
 103         while (y.d_name[++i] != 0);
 104         if ((off+i+2) > 511)
 105                 prname();
 106         for(j=off+1; j>=0; --j)
 107                 name[j+i+1] = name[j];
 108         off=i+off+1;
 109         name[i] = root[0];
 110         for(--i; i>=0; --i)
 111                 name[i] = y.d_name[i];
 112 }