commonx/BetterAdapters.pas at master · bintesztelo/commonx · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
unit BetterAdapters;

interface

uses
{$IFDEF MSWINDoWS}
  windows,
{$ENDIF}
{$IFDEF POSIX}
  Posix.Dlfcn, Posix.Fcntl, Posix.SysStat, Posix.SysTime, Posix.SysTypes,
{$ENDIF}
  types,
  sysutils;


function BetterFileOpen(const FileName: string; Mode: LongWord; Rights: cardinal; flags: cardinal): THandle;
function BetterFileCreate(const FileName: string; Mode: LongWord; Rights: cardinal; flags: cardinal): THandle;

implementation

uses
{$IFDEF POSIX}
  {$IFNDEF ANDROID}
  Posix.Iconv,
  {$ENDIF}
  Posix.Base, Posix.Dirent, Posix.Errno, Posix.Fnmatch,
  Posix.Langinfo, Posix.Locale, Posix.Pthread, Posix.Stdio, Posix.Stdlib,
  Posix.String_, Posix.SysSysctl, Posix.Time, Posix.Unistd, Posix.Utime,
  Posix.Wordexp, Posix.Pwd, Posix.Signal,
{$ENDIF POSIX}
  stringx;


function BetterFileOpen(const FileName: string; Mode: LongWord; Rights: cardinal; flags: cardinal): THandle;
{$IFDEF MSWINDOWS}
const
  AccessMode: array[0..2] of LongWord = (
    GENERIC_READ,
    GENERIC_WRITE,
    GENERIC_READ or GENERIC_WRITE);
  ShareMode: array[0..4] of LongWord = (
    0,
    0,
    FILE_SHARE_READ,
    FILE_SHARE_WRITE,
    FILE_SHARE_READ or FILE_SHARE_WRITE);
begin
  Result := INVALID_HANDLE_VALUE;
  if ((Mode and 3) <= fmOpenReadWrite) and
    ((Mode and $F0) <= fmShareDenyNone) then
    Result := CreateFile(PChar(FileName), AccessMode[Mode and 3],
      ShareMode[(Mode and $F0) shr 4], nil, OPEN_EXISTING,
      FILE_ATTRIBUTE_NORMAL or flags, 0);
end;
{$ENDIF MSWINDOWS}
{$IFDEF POSIX}
const
  ShareMode: array[0..fmShareDenyNone shr 4] of Byte = (
    0,        //No share mode specified
    F_WRLCK,  //fmShareExclusive
    F_RDLCK,  //fmShareDenyWrite
    0);       //fmShareDenyNone
var
  FileHandle, Tvar: Integer;
  LockVar: flock;
  smode: Byte;
  Code: Integer;
  M:TMarshaller;
begin
  Result := INVALID_HANDLE_VALUE;
  if FileExists(FileName) and
     ((Mode and 3) <= fmOpenReadWrite) and
     ((Mode and $F0) <= fmShareDenyNone) then
  begin
    FileHandle := __open(M.AsAnsi(FileName, CP_UTF8).ToPointer, (Mode and 3), FileAccessRights);
    if FileHandle = -1 then  Exit;

    smode := Mode and $F0 shr 4;
    if ShareMode[smode] <> 0 then
    begin
      LockVar.l_whence := 0;//SEEK_SET;
      LockVar.l_start := 0;
      LockVar.l_len := 0;
      LockVar.l_type := ShareMode[smode];
      Tvar := fcntl(FileHandle, F_SETLK, @LockVar);
      Code := errno;
      if (Tvar = -1) and (Code <> EINVAL) and (Code <> ENOTSUP) then
      // EINVAL/ENOTSUP - file doesn't support locking!
      begin
        __close(FileHandle);
        Exit;
      end;
    end;
    Result := FileHandle;
  end;
end;
{$ENDIF POSIX}


function BetterFileCreate(const FileName: string; Mode: LongWord; Rights: cardinal; flags: cardinal): THandle;
{$IFDEF MSWINDOWS}
const
  Exclusive: array[0..1] of LongWord = (
    CREATE_ALWAYS,
    CREATE_NEW);
  ShareMode: array[0..4] of LongWord = (
    0,
    0,
    FILE_SHARE_READ,
    FILE_SHARE_WRITE,
    FILE_SHARE_READ or FILE_SHARE_WRITE);
begin
  Result := INVALID_HANDLE_VALUE;
  if (Mode and $F0) <= fmShareDenyNone then
    Result := CreateFile(PChar(FileName), GENERIC_READ or GENERIC_WRITE,
      ShareMode[(Mode and $F0) shr 4], nil, Exclusive[(Mode and $0004) shr 2], FILE_ATTRIBUTE_NORMAL or Flags, 0);
end;
{$ENDIF MSWINDOWS}
{$IFDEF POSIX}
const
  Exclusive: array[0..1] of Cardinal = (
    0,
    O_EXCL);
  ShareMode: array[0..fmShareDenyNone shr 4] of Byte = (
    0,        //No share mode specified
    F_WRLCK,  //fmShareExclusive
    F_RDLCK,  //fmShareDenyWrite
    0);       //fmShareDenyNone
var
  FileHandle, Tvar: Integer;
  LockVar: flock;
  smode: Byte;
  Code: Integer;
  M:TMarshaller;
begin
  Result := INVALID_HANDLE_VALUE;
  if (Mode and $F0) <= fmShareDenyNone then
  begin
    FileHandle := Integer(__open(M.AsAnsi(FileName, CP_UTF8).ToPointer,
      O_RDWR or O_CREAT or O_TRUNC or Exclusive[(Mode and $0004) shr 2], Rights));
    if FileHandle = -1 then
      Exit;

    smode := Mode and $F0 shr 4;
    if ShareMode[smode] <> 0 then
    begin
      LockVar.l_whence := 0;//SEEK_SET;
      LockVar.l_start := 0;
      LockVar.l_len := 0;
      LockVar.l_type := ShareMode[smode];
      Tvar := fcntl(FileHandle, F_SETLK, @LockVar);
      Code := errno;
      if (Tvar = -1) and (Code <> EINVAL) and (Code <> ENOTSUP) then
      // EINVAL/ENOTSUP - file doesn't support locking
      begin
        __close(FileHandle);
        Exit;
      end;
    end;
    Result := FileHandle;
  end;
end;
{$ENDIF POSIX}


end.