UNIX 7th Ed. - /usr/src/cmd/rmdir.c

   1: /*
   2:  * Remove directory
   3:  */
   4: 
   5: #include <sys/types.h>
   6: #include <sys/dir.h>
   7: #include <sys/stat.h>
   8: #include <stdio.h>
   9: 
  10: int Errors = 0;
  11: char    *rindex();
  12: char    *strcat();
  13: char    *strcpy();
  14: 
  15: main(argc,argv)
  16: int argc;
  17: char **argv;
  18: {
  19: 
  20:     if(argc < 2) {
  21:         fprintf(stderr, "rmdir: arg count\n");
  22:         exit(1);
  23:     }
  24:     while(--argc)
  25:         rmdir(*++argv);
  26:     exit(Errors!=0);
  27: }
  28: 
  29: rmdir(d)
  30: char *d;
  31: {
  32:     int fd;
  33:     char    *np, name[500];
  34:     struct  stat    st, cst;
  35:     struct  direct  dir;
  36: 
  37:     strcpy(name, d);
  38:     if((np = rindex(name, '/')) == NULL)
  39:         np = name;
  40:     if(stat(name,&st) < 0) {
  41:         fprintf(stderr, "rmdir: %s non-existent\n", name);
  42:         ++Errors;
  43:         return;
  44:     }
  45:     if (stat("", &cst) < 0) {
  46:         fprintf(stderr, "rmdir: cannot stat \"\"");
  47:         ++Errors;
  48:         exit(1);
  49:     }
  50:     if((st.st_mode & S_IFMT) != S_IFDIR) {
  51:         fprintf(stderr, "rmdir: %s not a directory\n", name);
  52:         ++Errors;
  53:         return;
  54:     }
  55:     if(st.st_ino==cst.st_ino &&st.st_dev==cst.st_dev) {
  56:         fprintf(stderr, "rmdir: cannot remove current directory\n");
  57:         ++Errors;
  58:         return;
  59:     }
  60:     if((fd = open(name,0)) < 0) {
  61:         fprintf(stderr, "rmdir: %s unreadable\n", name);
  62:         ++Errors;
  63:         return;
  64:     }
  65:     while(read(fd, (char *)&dir, sizeof dir) == sizeof dir) {
  66:         if(dir.d_ino == 0) continue;
  67:         if(!strcmp(dir.d_name, ".") || !strcmp(dir.d_name, ".."))
  68:             continue;
  69:         fprintf(stderr, "rmdir: %s not empty\n", name);
  70:         ++Errors;
  71:         close(fd);
  72:         return;
  73:     }
  74:     close(fd);
  75:     if(!strcmp(np, ".") || !strcmp(np, "..")) {
  76:         fprintf(stderr, "rmdir: cannot remove . or ..\n");
  77:         ++Errors;
  78:         return;
  79:     }
  80:     strcat(name, "/.");
  81:     if((access(name, 0)) < 0) {     /* name/. non-existent */
  82:         strcat(name, ".");
  83:         goto unl;
  84:     }
  85:     strcat(name, ".");
  86:     if((access(name, 0)) < 0)       /* name/.. non-existent */
  87:         goto unl2;
  88:     if(access(name, 02)) {
  89:         name[strlen(name)-3] = '\0';
  90:         fprintf(stderr, "rmdir: %s: no permission\n", name);
  91:         ++Errors;
  92:         return;
  93:     }
  94: unl:
  95:     unlink(name);   /* unlink name/.. */
  96: unl2:
  97:     name[strlen(name)-1] = '\0';
  98:     unlink(name);   /* unlink name/.  */
  99:     name[strlen(name)-2] = '\0';
 100:     if (unlink(name) < 0) {
 101:         fprintf(stderr, "rmdir: %s not removed\n", name);
 102:         ++Errors;
 103:     }
 104: }

Defined functions

Defined variables