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fpc/rtl/unix/dos.pp
michael e73bc0b772 + Made AddDisk a function, returning the current number of drives. 
git-svn-id: trunk@3816 -
2006-06-06 20:54:21 +00:00

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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Michael Van Canneyt and Peter Vreman,
members of the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
Unit Dos;
Interface
uses baseunix;
Const
FileNameLen = 255;
Type
SearchRec =
{$ifndef FPC_REQUIRES_PROPER_ALIGNMENT}
packed
{$endif FPC_REQUIRES_PROPER_ALIGNMENT}
Record
{Fill : array[1..21] of byte; Fill replaced with below}
SearchPos : TOff; {directory position}
SearchNum : LongInt; {to track which search this is}
DirPtr : Pointer; {directory pointer for reading directory}
SearchType : Byte; {0=normal, 1=open will close, 2=only 1 file}
SearchAttr : Byte; {attribute we are searching for}
Fill : Array[1..03] of Byte; {future use}
{End of fill}
Attr : Byte; {attribute of found file}
Time : LongInt; {last modify date of found file}
Size : LongInt; {file size of found file}
Reserved : Word; {future use}
Name : String[FileNameLen]; {name of found file}
SearchSpec : String[FileNameLen]; {search pattern}
NamePos : Word; {end of path, start of name position}
End;
{$DEFINE HAS_FILENAMELEN}
{$i dosh.inc}
{Extra Utils}
function weekday(y,m,d : longint) : longint;
Procedure UnixDateToDt(SecsPast: LongInt; Var Dt: DateTime);
Function DTToUnixDate(DT: DateTime): LongInt;
{Disk}
Function AddDisk(const path:string) : byte;
Implementation
Uses
UnixUtil, // tzSeconds
Strings,
Unix,
{$ifdef FPC_USE_LIBC}initc{$ELSE}Syscall{$ENDIF};
{$DEFINE HAS_GETMSCOUNT}
{$DEFINE FPC_FEXPAND_TILDE} { Tilde is expanded to home }
{$DEFINE FPC_FEXPAND_GETENVPCHAR} { GetEnv result is a PChar }
{$I dos.inc}
{******************************************************************************
--- Link C Lib if set ---
******************************************************************************}
type
RtlInfoType = Record
FMode,
FInode,
FUid,
FGid,
FSize,
FMTime : LongInt;
End;
{******************************************************************************
--- Info / Date / Time ---
******************************************************************************}
Const
{Date Calculation}
C1970 = 2440588;
D0 = 1461;
D1 = 146097;
D2 = 1721119;
type
GTRec = packed Record
Year,
Month,
MDay,
WDay,
Hour,
Minute,
Second : Word;
End;
Function GregorianToJulian(Year,Month,Day:Longint):LongInt;
Var
Century,XYear: LongInt;
Begin
If Month<=2 Then
Begin
Dec(Year);
Inc(Month,12);
End;
Dec(Month,3);
Century:=(longint(Year Div 100)*D1) shr 2;
XYear:=(longint(Year Mod 100)*D0) shr 2;
GregorianToJulian:=((((Month*153)+2) div 5)+Day)+D2+XYear+Century;
End;
Function LocalToEpoch(year,month,day,hour,minute,second:Word):Longint;
{
Transforms local time (year,month,day,hour,minutes,second) to Epoch time
(seconds since 00:00, january 1 1970, corrected for local time zone)
}
Begin
LocalToEpoch:=((GregorianToJulian(Year,Month,Day)-c1970)*86400)+
(LongInt(Hour)*3600)+(Longint(Minute)*60)+Second-TZSeconds;
End;
Procedure JulianToGregorian(JulianDN:LongInt;Var Year,Month,Day:Word);
Var
YYear,XYear,Temp,TempMonth : LongInt;
Begin
Temp:=((JulianDN-D2) shl 2)-1;
JulianDN:=Temp Div D1;
XYear:=(Temp Mod D1) or 3;
YYear:=(XYear Div D0);
Temp:=((((XYear mod D0)+4) shr 2)*5)-3;
Day:=((Temp Mod 153)+5) Div 5;
TempMonth:=Temp Div 153;
If TempMonth>=10 Then
Begin
inc(YYear);
dec(TempMonth,12);
End;
inc(TempMonth,3);
Month := TempMonth;
Year:=YYear+(JulianDN*100);
end;
Procedure EpochToLocal(epoch:longint;var year,month,day,hour,minute,second:Word);
{
Transforms Epoch time into local time (hour, minute,seconds)
}
Var
DateNum: LongInt;
Begin
inc(Epoch,TZSeconds);
Datenum:=(Epoch Div 86400) + c1970;
JulianToGregorian(DateNum,Year,Month,day);
Epoch:=Abs(Epoch Mod 86400);
Hour:=Epoch Div 3600;
Epoch:=Epoch Mod 3600;
Minute:=Epoch Div 60;
Second:=Epoch Mod 60;
End;
Function DosVersion:Word;
Var
Buffer : Array[0..255] of Char;
Tmp2,
TmpStr : String[40];
TmpPos,
SubRel,
Rel : LongInt;
info : utsname;
Begin
FPUName(info);
Move(info.release,buffer[0],40);
TmpStr:=StrPas(Buffer);
SubRel:=0;
TmpPos:=Pos('.',TmpStr);
if TmpPos>0 then
begin
Tmp2:=Copy(TmpStr,TmpPos+1,40);
Delete(TmpStr,TmpPos,40);
end;
TmpPos:=Pos('.',Tmp2);
if TmpPos>0 then
Delete(Tmp2,TmpPos,40);
Val(TmpStr,Rel);
Val(Tmp2,SubRel);
DosVersion:=Rel+(SubRel shl 8);
End;
function WeekDay (y,m,d:longint):longint;
{
Calculates th day of the week. returns -1 on error
}
var
u,v : longint;
begin
if (m<1) or (m>12) or (y<1600) or (y>4000) or
(d<1) or (d>30+((m+ord(m>7)) and 1)-ord(m=2)) or
((m*d=58) and (((y mod 4>0) or (y mod 100=0)) and (y mod 400>0))) then
WeekDay:=-1
else
begin
u:=m;
v:=y;
if m<3 then
begin
inc(u,12);
dec(v);
end;
WeekDay:=(d+2*u+((3*(u+1)) div 5)+v+(v div 4)-(v div 100)+(v div 400)+1) mod 7;
end;
end;
Procedure GetDate(Var Year, Month, MDay, WDay: Word);
var
tz:timeval;
hour,min,sec : word;
begin
fpgettimeofday(@tz,nil);
EpochToLocal(tz.tv_sec,year,month,mday,hour,min,sec);
Wday:=weekday(Year,Month,MDay);
end;
procedure SetTime(Hour,Minute,Second,sec100:word);
var
dow,Year, Month, Day : Word;
tv : timeval;
begin
GetDate (Year, Month, Day,dow);
tv.tv_sec:= LocalToEpoch ( Year, Month, Day, Hour, Minute, Second ) ;
fpSettimeofday(@tv,nil);
end;
procedure SetDate(Year,Month,Day:Word);
var
Hour, Min, Sec, Sec100 : Word;
tv : timeval;
begin
GetTime ( Hour, Min, Sec, Sec100 );
tv.tv_sec:= LocalToEpoch ( Year, Month, Day, Hour, Min, Sec ) ;
fpSettimeofday(@tv,nil);
end;
Function SetDateTime(Year,Month,Day,hour,minute,second:Word) : Boolean;
var
tv : timeval;
begin
tv.tv_sec:= LocalToEpoch ( Year, Month, Day, Hour, Minute, Second ) ;
SetDatetime:=fpSettimeofday(@tv,nil)=0;
end;
Procedure GetTime(Var Hour, Minute, Second, Sec100: Word);
var
tz:timeval;
year,month,day : word;
begin
fpgettimeofday(@tz,nil);
EpochToLocal(tz.tv_sec,year,month,day,hour,minute,second);
sec100:=tz.tv_usec div 10000;
end;
Procedure UnixDateToDt(SecsPast: LongInt; Var Dt: DateTime);
Begin
EpochToLocal(SecsPast,dt.Year,dt.Month,dt.Day,dt.Hour,dt.Min,dt.Sec);
End;
Function DTToUnixDate(DT: DateTime): LongInt;
Begin
DTToUnixDate:=LocalToEpoch(dt.Year,dt.Month,dt.Day,dt.Hour,dt.Min,dt.Sec);
End;
function GetMsCount: int64;
var
tv : TimeVal;
{ tz : TimeZone;}
begin
FPGetTimeOfDay (@tv, nil {,tz});
GetMsCount := tv.tv_Sec * 1000 + tv.tv_uSec div 1000;
end;
{******************************************************************************
--- Exec ---
******************************************************************************}
Procedure Exec (Const Path: PathStr; Const ComLine: ComStr);
var
pid : longint; // pid_t?
cmdline2 : ppchar;
commandline : ansistring;
realpath : ansistring;
// The Error-Checking in the previous Version failed, since halt($7F) gives an WaitPid-status of $7F00
Begin
LastDosExitCode:=0;
if Path='' then
begin
doserror:=2;
exit;
end;
pid:=fpFork;
if pid=0 then
begin
cmdline2:=nil;
realpath:=path;
if Comline<>'' Then
begin
CommandLine:=ComLine; // conversion must live till after fpexec!
cmdline2:=StringtoPPChar(CommandLine,1);
cmdline2^:=pchar(realPath);
end
else
begin
getmem(cmdline2,2*sizeof(pchar));
cmdline2^:=pchar(realPath);
cmdline2[1]:=nil;
end;
{The child does the actual exec, and then exits}
fpExecv(pchar(realPath),cmdline2);
{If the execve fails, we return an exitvalue of 127, to let it be known}
fpExit(127);
end
else
if pid=-1 then {Fork failed}
begin
DosError:=8;
exit
end;
{We're in the parent, let's wait.}
LastDosExitCode:=WaitProcess(pid); // WaitPid and result-convert
if (LastDosExitCode>=0) and (LastDosExitCode<>127) then
DosError:=0
else
DosError:=8; // perhaps one time give an better error
End;
{******************************************************************************
--- Disk ---
******************************************************************************}
{
The Diskfree and Disksize functions need a file on the specified drive, since this
is required for the statfs system call.
These filenames are set in drivestr[0..26], and have been preset to :
0 - '.' (default drive - hence current dir is ok.)
1 - '/fd0/.' (floppy drive 1 - should be adapted to local system )
2 - '/fd1/.' (floppy drive 2 - should be adapted to local system )
3 - '/' (C: equivalent of dos is the root partition)
4..26 (can be set by you're own applications)
! Use AddDisk() to Add new drives !
They both return -1 when a failure occurs.
}
Const
FixDriveStr : array[0..3] of pchar=(
'.',
'/fd0/.',
'/fd1/.',
'/.'
);
const
Drives : byte = 4;
var
DriveStr : array[4..26] of pchar;
Function AddDisk(const path:string) : byte;
begin
if not (DriveStr[Drives]=nil) then
FreeMem(DriveStr[Drives],StrLen(DriveStr[Drives])+1);
GetMem(DriveStr[Drives],length(Path)+1);
StrPCopy(DriveStr[Drives],path);
inc(Drives);
if Drives>26 then
Drives:=4;
AddDisk:=Drives;
end;
Function DiskFree(Drive: Byte): int64;
var
fs : tstatfs;
Begin
if ((Drive<4) and (not (fixdrivestr[Drive]=nil)) and (StatFS(fixdrivestr[drive],fs)<>-1)) or
((not (drivestr[Drive]=nil)) and (StatFS(drivestr[drive],fs)<>-1)) then
Diskfree:=int64(fs.bavail)*int64(fs.bsize)
else
Diskfree:=-1;
End;
Function DiskSize(Drive: Byte): int64;
var
fs : tstatfs;
Begin
if ((Drive<4) and (not (fixdrivestr[Drive]=nil)) and (StatFS(fixdrivestr[drive],fs)<>-1)) or
((not (drivestr[Drive]=nil)) and (StatFS(drivestr[drive],fs)<>-1)) then
DiskSize:=int64(fs.blocks)*int64(fs.bsize)
else
DiskSize:=-1;
End;
{******************************************************************************
--- Findfirst FindNext ---
******************************************************************************}
Function FNMatch(const Pattern,Name:string):Boolean;
Var
LenPat,LenName : longint;
Function DoFNMatch(i,j:longint):Boolean;
Var
Found : boolean;
Begin
Found:=true;
While Found and (i<=LenPat) Do
Begin
Case Pattern[i] of
'?' : Found:=(j<=LenName);
'*' : Begin
{find the next character in pattern, different of ? and *}
while Found do
begin
inc(i);
if i>LenPat then Break;
case Pattern[i] of
'*' : ;
'?' : begin
if j>LenName then begin DoFNMatch:=false; Exit; end;
inc(j);
end;
else
Found:=false;
end;
end;
Assert((i>LenPat) or ( (Pattern[i]<>'*') and (Pattern[i]<>'?') ));
{Now, find in name the character which i points to, if the * or ?
wasn't the last character in the pattern, else, use up all the
chars in name}
Found:=false;
if (i<=LenPat) then
begin
repeat
{find a letter (not only first !) which maches pattern[i]}
while (j<=LenName) and (name[j]<>pattern[i]) do
inc (j);
if (j<LenName) then
begin
if DoFnMatch(i+1,j+1) then
begin
i:=LenPat;
j:=LenName;{we can stop}
Found:=true;
Break;
end else
inc(j);{We didn't find one, need to look further}
end else
if j=LenName then
begin
Found:=true;
Break;
end;
{ This 'until' condition must be j>LenName, not j>=LenName.
That's because when we 'need to look further' and
j = LenName then loop must not terminate. }
until (j>LenName);
end else
begin
j:=LenName;{we can stop}
Found:=true;
end;
end;
else {not a wildcard character in pattern}
Found:=(j<=LenName) and (pattern[i]=name[j]);
end;
inc(i);
inc(j);
end;
DoFnMatch:=Found and (j>LenName);
end;
Begin {start FNMatch}
LenPat:=Length(Pattern);
LenName:=Length(Name);
FNMatch:=DoFNMatch(1,1);
End;
Const
RtlFindSize = 15;
Type
RtlFindRecType = Record
DirPtr : Pointer;
SearchNum,
LastUsed : LongInt;
End;
Var
RtlFindRecs : Array[1..RtlFindSize] of RtlFindRecType;
CurrSearchNum : LongInt;
Procedure FindClose(Var f: SearchRec);
{
Closes dirptr if it is open
}
Var
i : longint;
Begin
if f.SearchType=0 then
begin
i:=1;
repeat
if (RtlFindRecs[i].SearchNum=f.SearchNum) then
break;
inc(i);
until (i>RtlFindSize);
If i<=RtlFindSize Then
Begin
RtlFindRecs[i].SearchNum:=0;
if f.dirptr<>nil then
fpclosedir(pdir(f.dirptr)^);
End;
end;
f.dirptr:=nil;
End;
Function FindGetFileInfo(const s:string;var f:SearchRec):boolean;
var
DT : DateTime;
Info : RtlInfoType;
st : baseunix.stat;
begin
FindGetFileInfo:=false;
if not fpstat(s,st)>=0 then
exit;
info.FSize:=st.st_Size;
info.FMTime:=st.st_mtime;
if (st.st_mode and STAT_IFMT)=STAT_IFDIR then
info.fmode:=$10
else
info.fmode:=$0;
if (st.st_mode and STAT_IWUSR)=0 then
info.fmode:=info.fmode or 1;
if s[f.NamePos+1]='.' then
info.fmode:=info.fmode or $2;
If ((Info.FMode and Not(f.searchattr))=0) Then
Begin
f.Name:=Copy(s,f.NamePos+1,255);
f.Attr:=Info.FMode;
f.Size:=Info.FSize;
UnixDateToDT(Info.FMTime, DT);
PackTime(DT,f.Time);
FindGetFileInfo:=true;
End;
end;
Function FindLastUsed: Longint;
{
Find unused or least recently used dirpointer slot in findrecs array
}
Var
BestMatch,i : Longint;
Found : Boolean;
Begin
BestMatch:=1;
i:=1;
Found:=False;
While (i <= RtlFindSize) And (Not Found) Do
Begin
If (RtlFindRecs[i].SearchNum = 0) Then
Begin
BestMatch := i;
Found := True;
End
Else
Begin
If RtlFindRecs[i].LastUsed > RtlFindRecs[BestMatch].LastUsed Then
BestMatch := i;
End;
Inc(i);
End;
FindLastUsed := BestMatch;
End;
Procedure FindNext(Var f: SearchRec);
{
re-opens dir if not already in array and calls FindWorkProc
}
Var
DirName : Array[0..256] of Char;
i,
ArrayPos : Longint;
FName,
SName : string;
Found,
Finished : boolean;
p : pdirent;
Begin
If f.SearchType=0 Then
Begin
ArrayPos:=0;
For i:=1 to RtlFindSize Do
Begin
If RtlFindRecs[i].SearchNum = f.SearchNum Then
ArrayPos:=i;
Inc(RtlFindRecs[i].LastUsed);
End;
If ArrayPos=0 Then
Begin
If f.NamePos = 0 Then
Begin
DirName[0] := '.';
DirName[1] := '/';
DirName[2] := #0;
End
Else
Begin
Move(f.SearchSpec[1], DirName[0], f.NamePos);
DirName[f.NamePos] := #0;
End;
f.DirPtr := fpopendir(@(DirName));
If f.DirPtr <> nil Then
begin
ArrayPos:=FindLastUsed;
If RtlFindRecs[ArrayPos].SearchNum > 0 Then
FpCloseDir((pdir(rtlfindrecs[arraypos].dirptr)^));
RtlFindRecs[ArrayPos].SearchNum := f.SearchNum;
RtlFindRecs[ArrayPos].DirPtr := f.DirPtr;
if f.searchpos>0 then
seekdir(pdir(f.dirptr), f.searchpos);
end;
End;
if ArrayPos>0 then
RtlFindRecs[ArrayPos].LastUsed:=0;
end;
{Main loop}
SName:=Copy(f.SearchSpec,f.NamePos+1,255);
Found:=False;
Finished:=(f.dirptr=nil);
While Not Finished Do
Begin
p:=fpreaddir(pdir(f.dirptr)^);
if p=nil then
FName:=''
else
FName:=Strpas(@p^.d_name);
If FName='' Then
Finished:=True
Else
Begin
If FNMatch(SName,FName) Then
Begin
Found:=FindGetFileInfo(Copy(f.SearchSpec,1,f.NamePos)+FName,f);
if Found then
Finished:=true;
End;
End;
End;
{Shutdown}
If Found Then
Begin
f.searchpos:=telldir(pdir(f.dirptr));
DosError:=0;
End
Else
Begin
FindClose(f);
DosError:=18;
End;
End;
Procedure FindFirst(Const Path: PathStr; Attr: Word; Var f: SearchRec);
{
opens dir and calls FindWorkProc
}
Begin
fillchar(f,sizeof(f),0);
if Path='' then
begin
DosError:=3;
exit;
end;
{Create Info}
f.SearchSpec := Path;
{We always also search for readonly and archive, regardless of Attr:}
f.SearchAttr := Attr or archive or readonly;
f.SearchPos := 0;
f.NamePos := Length(f.SearchSpec);
while (f.NamePos>0) and (f.SearchSpec[f.NamePos]<>'/') do
dec(f.NamePos);
{Wildcards?}
if (Pos('?',Path)=0) and (Pos('*',Path)=0) then
begin
if FindGetFileInfo(Path,f) then
DosError:=0
else
begin
{ According to tdos2 test it should return 18
if ErrNo=Sys_ENOENT then
DosError:=3
else }
DosError:=18;
end;
f.DirPtr:=nil;
f.SearchType:=1;
f.searchnum:=-1;
end
else
{Find Entry}
begin
Inc(CurrSearchNum);
f.SearchNum:=CurrSearchNum;
f.SearchType:=0;
FindNext(f);
end;
End;
{******************************************************************************
--- File ---
******************************************************************************}
Function FSearch(path : pathstr;dirlist : string) : pathstr;
Var
info : BaseUnix.stat;
Begin
if (length(Path)>0) and (path[1]='/') and (fpStat(path,info)>=0) and (not fpS_ISDIR(Info.st_Mode)) then
FSearch:=path
else
FSearch:=Unix.FSearch(path,dirlist);
End;
Procedure GetFAttr(var f; var attr : word);
Var
info : baseunix.stat;
LinAttr : longint;
Begin
DosError:=0;
if FPStat(@textrec(f).name,info)<0 then
begin
Attr:=0;
DosError:=3;
exit;
end
else
LinAttr:=Info.st_Mode;
if fpS_ISDIR(LinAttr) then
Attr:=$10
else
Attr:=$0;
if fpAccess(@textrec(f).name,W_OK)<0 then
Attr:=Attr or $1;
if filerec(f).name[0]='.' then
Attr:=Attr or $2;
end;
Procedure getftime (var f; var time : longint);
Var
Info: baseunix.stat;
DT: DateTime;
Begin
doserror:=0;
if fpfstat(filerec(f).handle,info)<0 then
begin
Time:=0;
doserror:=6;
exit
end
else
UnixDateToDT(Info.st_mTime,DT);
PackTime(DT,Time);
End;
Procedure setftime(var f; time : longint);
Var
utim: utimbuf;
DT: DateTime;
Begin
doserror:=0;
with utim do
begin
actime:=fptime;
UnPackTime(Time,DT);
modtime:=DTToUnixDate(DT);
end;
if fputime(@filerec(f).name,@utim)<0 then
begin
Time:=0;
doserror:=3;
end;
End;
{******************************************************************************
--- Environment ---
******************************************************************************}
Function EnvCount: Longint;
var
envcnt : longint;
p : ppchar;
Begin
envcnt:=0;
p:=envp; {defined in syslinux}
while (p^<>nil) do
begin
inc(envcnt);
inc(p);
end;
EnvCount := envcnt
End;
Function EnvStr (Index: longint): String;
Var
i : longint;
p : ppchar;
Begin
if Index <= 0 then
envstr:=''
else
begin
p:=envp; {defined in syslinux}
i:=1;
while (i<Index) and (p^<>nil) do
begin
inc(i);
inc(p);
end;
if p=nil then
envstr:=''
else
envstr:=strpas(p^)
end;
end;
Function GetEnv(EnvVar: String): String;
var
p : pchar;
Begin
p:=BaseUnix.fpGetEnv(EnvVar);
if p=nil then
GetEnv:=''
else
GetEnv:=StrPas(p);
End;
Procedure setfattr (var f;attr : word);
Begin
{! No Unix equivalent !}
{ Fail for setting VolumeId }
if (attr and VolumeID)<>0 then
doserror:=5;
End;
{******************************************************************************
--- Initialization ---
******************************************************************************}
End.
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