text: /*
   * Copyright (c) 2004, 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 <string.h>
  #include <errno.h>
  #include <descrip.h>
  #include <namdef.h>
  #include <rmsdef.h>
  #include <libfildef.h>
  #include <lib$routines.h>
  #include <strdef.h>
  #include <str$routines.h>
  #include <stsdef.h>
  #ifndef LPDIR_H
  # include "LPdir.h"
  #endif
  #include "vms_rms.h"
  
  /* Some compiler options hide EVMSERR. */
  #ifndef EVMSERR
  # define EVMSERR        65535   /* error for non-translatable VMS errors */
  #endif
  
  struct LP_dir_context_st {
      unsigned long VMS_context;
      char filespec[NAMX_MAXRSS + 1];
      char result[NAMX_MAXRSS + 1];
      struct dsc$descriptor_d filespec_dsc;
      struct dsc$descriptor_d result_dsc;
  };
  
  const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
  {
      int status;
      char *p, *r;
      size_t l;
      unsigned long flags = 0;
  
  /* Arrange 32-bit pointer to (copied) string storage, if needed. */
  #if __INITIAL_POINTER_SIZE == 64
  # pragma pointer_size save
  # pragma pointer_size 32
      char *ctx_filespec_32p;
  # pragma pointer_size restore
      char ctx_filespec_32[NAMX_MAXRSS + 1];
  #endif                          /* __INITIAL_POINTER_SIZE == 64 */
  
  #ifdef NAML$C_MAXRSS
      flags |= LIB$M_FIL_LONG_NAMES;
  #endif
  
      if (ctx == NULL || directory == NULL) {
          errno = EINVAL;
          return 0;
      }
  
      errno = 0;
      if (*ctx == NULL) {
          size_t filespeclen = strlen(directory);
          char *filespec = NULL;
  
          if (filespeclen == 0) {
              errno = ENOENT;
              return 0;
          }
  
          /* MUST be a VMS directory specification!  Let's estimate if it is. */
          if (directory[filespeclen - 1] != ']'
              && directory[filespeclen - 1] != '>'
              && directory[filespeclen - 1] != ':') {
              errno = EINVAL;
              return 0;
          }
  
          filespeclen += 4;       /* "*.*;" */
  
          if (filespeclen > NAMX_MAXRSS) {
              errno = ENAMETOOLONG;
              return 0;
          }
  
          *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
          if (*ctx == NULL) {
              errno = ENOMEM;
              return 0;
          }
          memset(*ctx, '\0', sizeof(LP_DIR_CTX));
  
          strcpy((*ctx)->filespec, directory);
          strcat((*ctx)->filespec, "*.*;");
  
  /* Arrange 32-bit pointer to (copied) string storage, if needed. */
  #if __INITIAL_POINTER_SIZE == 64
  # define CTX_FILESPEC ctx_filespec_32p
          /* Copy the file name to storage with a 32-bit pointer. */
          ctx_filespec_32p = ctx_filespec_32;
          strcpy(ctx_filespec_32p, (*ctx)->filespec);
  #else                           /* __INITIAL_POINTER_SIZE == 64 */
  # define CTX_FILESPEC (*ctx)->filespec
  #endif                          /* __INITIAL_POINTER_SIZE == 64 [else] */
  
          (*ctx)->filespec_dsc.dsc$w_length = filespeclen;
          (*ctx)->filespec_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
          (*ctx)->filespec_dsc.dsc$b_class = DSC$K_CLASS_S;
          (*ctx)->filespec_dsc.dsc$a_pointer = CTX_FILESPEC;
      }
  
      (*ctx)->result_dsc.dsc$w_length = 0;
      (*ctx)->result_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
      (*ctx)->result_dsc.dsc$b_class = DSC$K_CLASS_D;
      (*ctx)->result_dsc.dsc$a_pointer = 0;
  
      status = lib$find_file(&(*ctx)->filespec_dsc, &(*ctx)->result_dsc,
                             &(*ctx)->VMS_context, 0, 0, 0, &flags);
  
      if (status == RMS$_NMF) {
          errno = 0;
          vaxc$errno = status;
          return NULL;
      }
  
      if (!$VMS_STATUS_SUCCESS(status)) {
          errno = EVMSERR;
          vaxc$errno = status;
          return NULL;
      }
  
      /*
       * Quick, cheap and dirty way to discard any device and directory, since
       * we only want file names
       */
      l = (*ctx)->result_dsc.dsc$w_length;
      p = (*ctx)->result_dsc.dsc$a_pointer;
      r = p;
      for (; *p; p++) {
          if (*p == '^' && p[1] != '\0') { /* Take care of ODS-5 escapes */
              p++;
          } else if (*p == ':' || *p == '>' || *p == ']') {
              l -= p + 1 - r;
              r = p + 1;
          } else if (*p == ';') {
              l = p - r;
              break;
          }
      }
  
      strncpy((*ctx)->result, r, l);
      (*ctx)->result[l] = '\0';
      str$free1_dx(&(*ctx)->result_dsc);
  
      return (*ctx)->result;
  }
  
  int LP_find_file_end(LP_DIR_CTX **ctx)
  {
      if (ctx != NULL && *ctx != NULL) {
          int status = lib$find_file_end(&(*ctx)->VMS_context);
  
          free(*ctx);
  
          if (!$VMS_STATUS_SUCCESS(status)) {
              errno = EVMSERR;
              vaxc$errno = status;
              return 0;
          }
          return 1;
      }
      errno = EINVAL;
      return 0;
  }
  