Checking for existence of users and groups

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In this implementation, anyway, checking for the existence of a user or a group is as simple as checking the repository directory for the named file.

user_exists()
  
int user_exists(const char * user)
{
   char buf[1024];
   FILE * file;
   sprintf (buf, "%s%s", USER_REPOSITORY, user);
   file = fopen (buf, "r");
   if (file) {
      fclose (file);
      return 1;
   }
   return 0;
}


group_exists()
  
int group_exists(const char * group)
{
   char buf[1024];
   FILE * file;
   sprintf (buf, "%s%s", GROUP_REPOSITORY, group);
   file = fopen (buf, "r");
   if (file) {
      fclose (file);
      return 1;
   }
   return 0;
}
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