LPdir_vms.c revision 279265 
1/*
2 * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <stddef.h>
28#include <stdlib.h>
29#include <string.h>
30#include <errno.h>
31#include <descrip.h>
32#include <namdef.h>
33#include <rmsdef.h>
34#include <libfildef.h>
35#include <lib$routines.h>
36#include <strdef.h>
37#include <str$routines.h>
38#include <stsdef.h>
39#ifndef LPDIR_H
40#include "LPdir.h"
41#endif
42
43/* Because some compiler options hide this macor */
44#ifndef EVMSERR
45#define EVMSERR		65535  /* error for non-translatable VMS errors */
46#endif
47
48struct LP_dir_context_st
49{
50  unsigned long VMS_context;
51#ifdef NAML$C_MAXRSS
52  char filespec[NAML$C_MAXRSS+1];
53  char result[NAML$C_MAXRSS+1];
54#else
55  char filespec[256];
56  char result[256];
57#endif
58  struct dsc$descriptor_d filespec_dsc;
59  struct dsc$descriptor_d result_dsc;
60};
61
62const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
63{
64  int status;
65  char *p, *r;
66  size_t l;
67  unsigned long flags = 0;
68#ifdef NAML$C_MAXRSS
69  flags |= LIB$M_FIL_LONG_NAMES;
70#endif
71
72  if (ctx == NULL || directory == NULL)
73    {
74      errno = EINVAL;
75      return 0;
76    }
77
78  errno = 0;
79  if (*ctx == NULL)
80    {
81      size_t filespeclen = strlen(directory);
82      char *filespec = NULL;
83
84      if (filespeclen == 0)
85	{
86	  errno = ENOENT;
87	  return 0;
88	}
89
90      /* MUST be a VMS directory specification!  Let's estimate if it is. */
91      if (directory[filespeclen-1] != ']'
92	  && directory[filespeclen-1] != '>'
93	  && directory[filespeclen-1] != ':')
94	{
95	  errno = EINVAL;
96	  return 0;
97	}
98
99      filespeclen += 4;		/* "*.*;" */
100
101      if (filespeclen >
102#ifdef NAML$C_MAXRSS
103	  NAML$C_MAXRSS
104#else
105	  255
106#endif
107	  )
108	{
109	  errno = ENAMETOOLONG;
110	  return 0;
111	}
112
113      *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
114      if (*ctx == NULL)
115	{
116	  errno = ENOMEM;
117	  return 0;
118	}
119      memset(*ctx, '\0', sizeof(LP_DIR_CTX));
120
121      strcpy((*ctx)->filespec,directory);
122      strcat((*ctx)->filespec,"*.*;");
123      (*ctx)->filespec_dsc.dsc$w_length = filespeclen;
124      (*ctx)->filespec_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
125      (*ctx)->filespec_dsc.dsc$b_class = DSC$K_CLASS_S;
126      (*ctx)->filespec_dsc.dsc$a_pointer = (*ctx)->filespec;
127      (*ctx)->result_dsc.dsc$w_length = 0;
128      (*ctx)->result_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
129      (*ctx)->result_dsc.dsc$b_class = DSC$K_CLASS_D;
130      (*ctx)->result_dsc.dsc$a_pointer = 0;
131    }
132
133  (*ctx)->result_dsc.dsc$w_length = 0;
134  (*ctx)->result_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
135  (*ctx)->result_dsc.dsc$b_class = DSC$K_CLASS_D;
136  (*ctx)->result_dsc.dsc$a_pointer = 0;
137
138  status = lib$find_file(&(*ctx)->filespec_dsc, &(*ctx)->result_dsc,
139			 &(*ctx)->VMS_context, 0, 0, 0, &flags);
140
141  if (status == RMS$_NMF)
142    {
143      errno = 0;
144      vaxc$errno = status;
145      return NULL;
146    }
147
148  if(!$VMS_STATUS_SUCCESS(status))
149    {
150      errno = EVMSERR;
151      vaxc$errno = status;
152      return NULL;
153    }
154
155  /* Quick, cheap and dirty way to discard any device and directory,
156     since we only want file names */
157  l = (*ctx)->result_dsc.dsc$w_length;
158  p = (*ctx)->result_dsc.dsc$a_pointer;
159  r = p;
160  for (; *p; p++)
161    {
162      if (*p == '^' && p[1] != '\0') /* Take care of ODS-5 escapes */
163	{
164	  p++;
165	}
166      else if (*p == ':' || *p == '>' || *p == ']')
167	{
168	  l -= p + 1 - r;
169	  r = p + 1;
170	}
171      else if (*p == ';')
172	{
173	  l = p - r;
174	  break;
175	}
176    }
177
178  strncpy((*ctx)->result, r, l);
179  (*ctx)->result[l] = '\0';
180  str$free1_dx(&(*ctx)->result_dsc);
181
182  return (*ctx)->result;
183}
184
185int LP_find_file_end(LP_DIR_CTX **ctx)
186{
187  if (ctx != NULL && *ctx != NULL)
188    {
189      int status = lib$find_file_end(&(*ctx)->VMS_context);
190
191      free(*ctx);
192
193      if(!$VMS_STATUS_SUCCESS(status))
194	{
195	  errno = EVMSERR;
196	  vaxc$errno = status;
197	  return 0;
198	}
199      return 1;
200    }
201  errno = EINVAL;
202  return 0;
203}
204
205