text: /*
   * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  /*
   * This file is dual-licensed and is also available under the following
   * terms:
   *
   * Copyright (c) 2004, 2018, Richard Levitte <richard@levitte.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <stddef.h>
  #include <stdlib.h>
  #include <limits.h>
  #include <string.h>
  #include <sys/types.h>
  #include <dirent.h>
  #include <errno.h>
  #ifndef LPDIR_H
  # include "LPdir.h"
  #endif
  #ifdef __VMS
  # include <ctype.h>
  #endif
  
  /*
   * The POSIXly macro for the maximum number of characters in a file path is
   * NAME_MAX.  However, some operating systems use PATH_MAX instead.
   * Therefore, it seems natural to first check for PATH_MAX and use that, and
   * if it doesn't exist, use NAME_MAX.
   */
  #if defined(PATH_MAX)
  # define LP_ENTRY_SIZE PATH_MAX
  #elif defined(NAME_MAX)
  # define LP_ENTRY_SIZE NAME_MAX
  #endif
  
  /*
   * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
   * exist.  It's also possible that NAME_MAX exists but is define to a very
   * small value (HP-UX offers 14), so we need to check if we got a result, and
   * if it meets a minimum standard, and create or change it if not.
   */
  #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
  # undef LP_ENTRY_SIZE
  # define LP_ENTRY_SIZE 255
  #endif
  
  struct LP_dir_context_st {
      DIR *dir;
      char entry_name[LP_ENTRY_SIZE + 1];
  #ifdef __VMS
      int expect_file_generations;
      char previous_entry_name[LP_ENTRY_SIZE + 1];
  #endif
  };
  
  const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
  {
      struct dirent *direntry = NULL;
  
      if (ctx == NULL || directory == NULL) {
          errno = EINVAL;
          return 0;
      }
  
      errno = 0;
      if (*ctx == NULL) {
          *ctx = malloc(sizeof(**ctx));
          if (*ctx == NULL) {
              errno = ENOMEM;
              return 0;
          }
          memset(*ctx, 0, sizeof(**ctx));
  
  #ifdef __VMS
          {
              char c = directory[strlen(directory) - 1];
  
              if (c == ']' || c == '>' || c == ':')
                  (*ctx)->expect_file_generations = 1;
          }
  #endif
  
          (*ctx)->dir = opendir(directory);
          if ((*ctx)->dir == NULL) {
              int save_errno = errno; /* Probably not needed, but I'm paranoid */
              free(*ctx);
              *ctx = NULL;
              errno = save_errno;
              return 0;
          }
      }
  
  #ifdef __VMS
      strncpy((*ctx)->previous_entry_name, (*ctx)->entry_name,
              sizeof((*ctx)->previous_entry_name));
  
   again:
  #endif
  
      direntry = readdir((*ctx)->dir);
      if (direntry == NULL) {
          return 0;
      }
  
      strncpy((*ctx)->entry_name, direntry->d_name,
              sizeof((*ctx)->entry_name) - 1);
      (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
  #ifdef __VMS
      if ((*ctx)->expect_file_generations) {
          char *p = (*ctx)->entry_name + strlen((*ctx)->entry_name);
  
          while(p > (*ctx)->entry_name && isdigit(p[-1]))
              p--;
          if (p > (*ctx)->entry_name && p[-1] == ';')
              p[-1] = '\0';
          if (strcasecmp((*ctx)->entry_name, (*ctx)->previous_entry_name) == 0)
              goto again;
      }
  #endif
      return (*ctx)->entry_name;
  }
  
  int LP_find_file_end(LP_DIR_CTX **ctx)
  {
      if (ctx != NULL && *ctx != NULL) {
          int ret = closedir((*ctx)->dir);
  
          free(*ctx);
          switch (ret) {
          case 0:
              return 1;
          case -1:
              return 0;
          default:
              break;
          }
      }
      errno = EINVAL;
      return 0;
  }
  