/* $LP: LPlib/source/LPdir_vms.c,v 1.20 2004/08/26 13:36:05 _cvs_levitte Exp $ */

/*

 * 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

/* Because some compiler options hide this macor */

#ifndef EVMSERR

#define EVMSERR		65535  /* error for non-translatable VMS errors */

#endif

struct LP_dir_context_st

{

  unsigned long VMS_context;

#ifdef NAML$C_MAXRSS

  char filespec[NAML$C_MAXRSS+1];

  char result[NAML$C_MAXRSS+1];

#else

  char filespec[256];

  char result[256];

#endif

  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;

#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;

      /* 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 >

#ifdef NAML$C_MAXRSS

	  NAML$C_MAXRSS

#else

	  255

#endif

	  )

	{

	  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,"*.*;");

      (*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;

    }

  (*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;

}