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LPdir_win.c
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1 /* $LP: LPlib/source/LPdir_win.c,v 1.10 2004/08/26 13:36:05 _cvs_levitte Exp $ */
2 /*
3  * Copyright (c) 2004, Richard Levitte <[email protected]>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 #include <windows.h>
28 #include <tchar.h>
29 #ifndef LPDIR_H
30 #include "LPdir.h"
31 #endif
32 
33 /* We're most likely overcautious here, but let's reserve for
34  broken WinCE headers and explicitly opt for UNICODE call.
35  Keep in mind that our WinCE builds are compiled with -DUNICODE
36  [as well as -D_UNICODE]. */
37 #if defined(LP_SYS_WINCE) && !defined(FindFirstFile)
38 # define FindFirstFile FindFirstFileW
39 #endif
40 #if defined(LP_SYS_WINCE) && !defined(FindFirstFile)
41 # define FindNextFile FindNextFileW
42 #endif
43 
44 #ifndef NAME_MAX
45 #define NAME_MAX 255
46 #endif
47 
48 struct LP_dir_context_st
49 {
50  WIN32_FIND_DATA ctx;
51  HANDLE handle;
52  char entry_name[NAME_MAX+1];
53 };
54 
55 const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
56 {
57  if (ctx == NULL || directory == NULL)
58  {
59  errno = EINVAL;
60  return 0;
61  }
62 
63  errno = 0;
64  if (*ctx == NULL)
65  {
66  *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
67  if (*ctx == NULL)
68  {
69  errno = ENOMEM;
70  return 0;
71  }
72  memset(*ctx, '\0', sizeof(LP_DIR_CTX));
73 
74  if (sizeof(TCHAR) != sizeof(char))
75  {
76  TCHAR *wdir = NULL;
77  /* len_0 denotes string length *with* trailing 0 */
78  size_t index = 0,len_0 = strlen(directory) + 1;
79 
80  wdir = (TCHAR *)malloc(len_0 * sizeof(TCHAR));
81  if (wdir == NULL)
82  {
83  free(*ctx);
84  *ctx = NULL;
85  errno = ENOMEM;
86  return 0;
87  }
88 
89 #ifdef LP_MULTIBYTE_AVAILABLE
90  if (!MultiByteToWideChar(CP_ACP, 0, directory, len_0, (WCHAR *)wdir, len_0))
91 #endif
92  for (index = 0; index < len_0; index++)
93  wdir[index] = (TCHAR)directory[index];
94 
95  (*ctx)->handle = FindFirstFile(wdir, &(*ctx)->ctx);
96 
97  free(wdir);
98  }
99  else
100  (*ctx)->handle = FindFirstFile((TCHAR *)directory, &(*ctx)->ctx);
101 
102  if ((*ctx)->handle == INVALID_HANDLE_VALUE)
103  {
104  free(*ctx);
105  *ctx = NULL;
106  errno = EINVAL;
107  return 0;
108  }
109  }
110  else
111  {
112  if (FindNextFile((*ctx)->handle, &(*ctx)->ctx) == FALSE)
113  {
114  return 0;
115  }
116  }
117 
118  if (sizeof(TCHAR) != sizeof(char))
119  {
120  TCHAR *wdir = (*ctx)->ctx.cFileName;
121  size_t index, len_0 = 0;
122 
123  while (wdir[len_0] && len_0 < (sizeof((*ctx)->entry_name) - 1)) len_0++;
124  len_0++;
125 
126 #ifdef LP_MULTIBYTE_AVAILABLE
127  if (!WideCharToMultiByte(CP_ACP, 0, (WCHAR *)wdir, len_0, (*ctx)->entry_name,
128  sizeof((*ctx)->entry_name), NULL, 0))
129 #endif
130  for (index = 0; index < len_0; index++)
131  (*ctx)->entry_name[index] = (char)wdir[index];
132  }
133  else
134  strncpy((*ctx)->entry_name, (const char *)(*ctx)->ctx.cFileName,
135  sizeof((*ctx)->entry_name)-1);
136 
137  (*ctx)->entry_name[sizeof((*ctx)->entry_name)-1] = '\0';
138 
139  return (*ctx)->entry_name;
140 }
141 
143 {
144  if (ctx != NULL && *ctx != NULL)
145  {
146  FindClose((*ctx)->handle);
147  free(*ctx);
148  *ctx = NULL;
149  return 1;
150  }
151  errno = EINVAL;
152  return 0;
153 }