4.3BSD - /usr/src/new/dsh/src/getwd.c

   1: /*
   2:  *  Getwd
   3:  */
   4: #include    <stdio.h>
   5: #include    <sys/param.h>
   6: #include    <sys/stat.h>
   7: #include    <sys/dir.h>
   8: 
   9: char    dot[]   = ".";
  10: char    dotdot[] = "..";
  11: DIR *file;
  12: int off = -1;
  13: struct  stat    d, dd;
  14: struct  direct  *dir;
  15: 
  16: getwd(name)
  17: char    *name;
  18: {
  19:     int rdev, rino;
  20: 
  21:     name[0] = '/';
  22:     stat("/", &d);
  23:     rdev = d.st_dev;
  24:     rino = d.st_ino;
  25:     for (;;) {
  26:         stat(dot, &d);
  27:         if (d.st_ino==rino && d.st_dev==rdev) {
  28:             return;
  29:         }
  30:         if ((file = opendir(dotdot)) == NULL) {
  31:             error ("can't open ..");
  32:         }
  33:         fstat(file->dd_fd, &dd);
  34:         chdir(dotdot);
  35:         if(d.st_dev == dd.st_dev) {
  36:             if(d.st_ino == dd.st_ino){
  37:                 return;
  38:             }
  39:             do
  40:                 if ((dir = readdir(file)) == NULL) {
  41:                     fprintf(stderr,"read error in ..\n");
  42:                     exit(1);
  43:                 }
  44:             while (dir->d_ino != d.st_ino);
  45:         } else
  46:             do {
  47:                 if ((dir = readdir(file)) == NULL) {
  48:                     fprintf(stderr,"read error in ..\n");
  49:                     exit(1);
  50:                 }
  51:                 stat(dir->d_name, &dd);
  52:             } while(dd.st_ino != d.st_ino || dd.st_dev != d.st_dev);
  53:         closedir(file);
  54:         cat(name+1);
  55:     }
  56: }
  57: 
  58: cat(name)
  59: char *name;
  60: {
  61:     register i, j;
  62: 
  63:     i = dir->d_namlen;
  64:     for(j=off+1; j>=0; --j)
  65:         name[j+i+1] = name[j];
  66:     off=i+off+1;
  67:     name[i] = '/';
  68:     for(--i; i>=0; --i)
  69:         name[i] = dir->d_name[i];
  70: }

Defined functions

Defined variables