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;
  }
  
  