LPdir_vms.c revision 296465 
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    unsigned long VMS_context;
50#ifdef NAML$C_MAXRSS
51    char filespec[NAML$C_MAXRSS + 1];
52    char result[NAML$C_MAXRSS + 1];
53#else
54    char filespec[256];
55    char result[256];
56#endif
57    struct dsc$descriptor_d filespec_dsc;
58    struct dsc$descriptor_d result_dsc;
59};
60
61const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
62{
63    int status;
64    char *p, *r;
65    size_t l;
66    unsigned long flags = 0;
67#ifdef NAML$C_MAXRSS
68    flags |= LIB$M_FIL_LONG_NAMES;
69#endif
70
71    if (ctx == NULL || directory == NULL) {
72        errno = EINVAL;
73        return 0;
74    }
75
76    errno = 0;
77    if (*ctx == NULL) {
78        size_t filespeclen = strlen(directory);
79        char *filespec = NULL;
80
81        if (filespeclen == 0) {
82            errno = ENOENT;
83            return 0;
84        }
85
86        /* MUST be a VMS directory specification!  Let's estimate if it is. */
87        if (directory[filespeclen - 1] != ']'
88            && directory[filespeclen - 1] != '>'
89            && directory[filespeclen - 1] != ':') {
90            errno = EINVAL;
91            return 0;
92        }
93
94        filespeclen += 4;       /* "*.*;" */
95
96        if (filespeclen >
97#ifdef NAML$C_MAXRSS
98            NAML$C_MAXRSS
99#else
100            255
101#endif
102            ) {
103            errno = ENAMETOOLONG;
104            return 0;
105        }
106
107        *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
108        if (*ctx == NULL) {
109            errno = ENOMEM;
110            return 0;
111        }
112        memset(*ctx, '\0', sizeof(LP_DIR_CTX));
113
114        strcpy((*ctx)->filespec, directory);
115        strcat((*ctx)->filespec, "*.*;");
116        (*ctx)->filespec_dsc.dsc$w_length = filespeclen;
117        (*ctx)->filespec_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
118        (*ctx)->filespec_dsc.dsc$b_class = DSC$K_CLASS_S;
119        (*ctx)->filespec_dsc.dsc$a_pointer = (*ctx)->filespec;
120        (*ctx)->result_dsc.dsc$w_length = 0;
121        (*ctx)->result_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
122        (*ctx)->result_dsc.dsc$b_class = DSC$K_CLASS_D;
123        (*ctx)->result_dsc.dsc$a_pointer = 0;
124    }
125
126    (*ctx)->result_dsc.dsc$w_length = 0;
127    (*ctx)->result_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
128    (*ctx)->result_dsc.dsc$b_class = DSC$K_CLASS_D;
129    (*ctx)->result_dsc.dsc$a_pointer = 0;
130
131    status = lib$find_file(&(*ctx)->filespec_dsc, &(*ctx)->result_dsc,
132                           &(*ctx)->VMS_context, 0, 0, 0, &flags);
133
134    if (status == RMS$_NMF) {
135        errno = 0;
136        vaxc$errno = status;
137        return NULL;
138    }
139
140    if (!$VMS_STATUS_SUCCESS(status)) {
141        errno = EVMSERR;
142        vaxc$errno = status;
143        return NULL;
144    }
145
146    /*
147     * Quick, cheap and dirty way to discard any device and directory, since
148     * we only want file names
149     */
150    l = (*ctx)->result_dsc.dsc$w_length;
151    p = (*ctx)->result_dsc.dsc$a_pointer;
152    r = p;
153    for (; *p; p++) {
154        if (*p == '^' && p[1] != '\0') { /* Take care of ODS-5 escapes */
155            p++;
156        } else if (*p == ':' || *p == '>' || *p == ']') {
157            l -= p + 1 - r;
158            r = p + 1;
159        } else if (*p == ';') {
160            l = p - r;
161            break;
162        }
163    }
164
165    strncpy((*ctx)->result, r, l);
166    (*ctx)->result[l] = '\0';
167    str$free1_dx(&(*ctx)->result_dsc);
168
169    return (*ctx)->result;
170}
171
172int LP_find_file_end(LP_DIR_CTX **ctx)
173{
174    if (ctx != NULL && *ctx != NULL) {
175        int status = lib$find_file_end(&(*ctx)->VMS_context);
176
177        free(*ctx);
178
179        if (!$VMS_STATUS_SUCCESS(status)) {
180            errno = EVMSERR;
181            vaxc$errno = status;
182            return 0;
183        }
184        return 1;
185    }
186    errno = EINVAL;
187    return 0;
188}
189