home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Almathera Ten Pack 2: CDPD 1
/
Almathera Ten on Ten - Disc 2: CDPD 1.iso
/
pd
/
076-100
/
077
/
samples
/
hedit.d
< prev
next >
Wrap
Text File
|
1995-03-13
|
16KB
|
829 lines
#include:util.g
#include:crt.g
char CSI = '\(0x9b)';
uint BUFFSIZE = 1024;
uint
FILECOL = 12,
ROCOL = 2,
POSCOL = 33,
POSLEN = 6,
NUMLEN = 11,
HEXCOL = 7,
ERRORCOL = POSCOL + NUMLEN + 1;
uint NLines, NCols;
file(BUFFSIZE) Fyle;
channel input binary ChIn;
channel output binary ChOut;
channel output text CRTOut;
*char FileName;
ulong FilePos, WindowPos, EndPos;
uint CursorLine, CursorColHex, CursorColChar;
bool ReadOnly, Binary, HadError;
proc err(*char message)void:
CRT_Move(NLines - 1, ERRORCOL);
CRT_EnterHighLight();
write(CRTOut; message);
CRT_ExitHighLight();
HadError := true;
corp;
proc abort(*char message)void:
writeln("HEdit I/O error: ", message, ' ',
ioerror(ChIn), ' ', ioerror(ChOut));
if not ReadOnly then
close(ChOut);
fi;
close(ChIn);
close(CRTOut);
CRT_Abort();
corp;
proc endOfFile()void:
err("End of file");
corp;
proc startOfFile()void:
err("Beginning of file");
corp;
proc displayPos()void:
CRT_Move(NLines - 1, POSCOL);
write(CRTOut; FilePos : x : -POSLEN);
corp;
proc displayStatus()void:
uint i;
HadError := false;
CRT_ClearLine(NLines - 1);
for i from 0 upto NCols - 2 do
write(CRTOut; '-');
od;
CRT_Move(NLines - 1, FILECOL);
write(CRTOut; FileName);
if ReadOnly then
CRT_Move(NLines - 1, ROCOL);
write(CRTOut; "[RO]");
fi;
displayPos();
CRT_Move(NLines - 1, HEXCOL);
write(CRTOut; if Binary then "hex-" else "char" fi);
corp;
proc clearError()void:
uint i;
if HadError then
HadError := false;
CRT_Move(NLines - 1, ERRORCOL);
for i from ERRORCOL + 2 upto NCols do
write(CRTOut; '-');
od;
fi;
corp;
proc getChar()char:
char ch;
ch := CRT_ReadChar();
clearError();
ch
corp;
proc ASCIIPut(byte b)void:
write(CRTOut; if b + '\e' >= ' ' and b + '\e' <= '~' then
b + '\e'
else
'.'
fi);
corp;
proc seek(ulong pos)void:
if not SeekIn(ChIn, pos) then
abort("Seek failed");
fi;
corp;
proc unCursor()void:
byte b;
seek(FilePos);
read(ChIn; b);
CRT_Move(CursorLine, CursorColHex);
write(CRTOut; b : x : -2);
CRT_Move(CursorLine, CursorColChar);
ASCIIPut(b);
corp;
proc putCursor()void:
byte b;
seek(FilePos);
read(ChIn; b);
CRT_EnterHighLight();
CRT_Move(CursorLine, CursorColHex);
write(CRTOut; b : x : -2);
CRT_Move(CursorLine, CursorColChar);
ASCIIPut(b);
CRT_ExitHighLight();
corp;
proc displayLine(ulong pos)bool:
uint c, c1;
[16] byte buff;
write(CRTOut; pos : x : -POSLEN, ": ");
c := 0;
while c ~= 16 and read(ChIn; buff[c]) do
write(CRTOut; buff[c] : x : -2, ' ');
c := c + 1;
od;
for c1 from c upto 15 do
buff[c1] := ' ' - '\e';
write(CRTOut; " ");
od;
write(CRTOut; " *");
for c1 from 0 upto 15 do
ASCIIPut(buff[c1]);
od;
write(CRTOut; "*\r\n");
ioerror(ChIn) = CH_OK
corp;
proc displayScreen()void:
ulong pos;
uint l;
CRT_Move(0, 0);
pos := WindowPos;
l := 0;
seek(pos);
while l ~= NLines - 1 and displayLine(pos) do
l := l + 1;
pos := pos + 16;
od;
l := l + 1;
while l < NLines - 1 do
CRT_ClearLine(l);
l := l + 1;
od;
putCursor();
corp;
proc scrollUp()void:
ulong pos;
pos := WindowPos + (NLines - 1) * 16;
if pos < EndPos then
CRT_ClearLine(NLines - 1);
seek(pos);
pretend(displayLine(pos), void);
WindowPos := WindowPos + 16;
if CursorLine = 0 then
FilePos := FilePos + 16;
if FilePos > EndPos - 1 then
CursorColHex := CursorColHex - 3 * (EndPos - 1 - FilePos);
CursorColChar := CursorColChar - (EndPos - 1 - FilePos);
FilePos := EndPos - 1;
fi;
putCursor();
else
CursorLine := CursorLine - 1;
fi;
displayStatus();
else
endOfFile();
fi;
corp;
proc cursorForward()void:
if FilePos & 0xf = 0xf and CursorLine = NLines - 2 then
scrollUp();
fi;
if FilePos < EndPos - 1 then
unCursor();
FilePos := FilePos + 1;
if FilePos & 0xf = 0 then
CursorLine := CursorLine + 1;
CursorColHex := 9;
CursorColChar := 59;
else
CursorColHex := CursorColHex + 3;
CursorColChar := CursorColChar + 1;
fi;
putCursor();
displayPos();
else
endOfFile();
fi;
corp;
proc cursorBackward()void:
if FilePos ~= 0 then
unCursor();
FilePos := FilePos - 1;
if FilePos & 0xf = 0xf then
CursorColHex := 9 + 30 + 15;
CursorColChar := 59 + 15;
if CursorLine = 0 then
WindowPos := WindowPos - 16;
CRT_ClearScreen();
displayScreen();
displayStatus();
else
CursorLine := CursorLine - 1;
fi;
else
CursorColHex := CursorColHex - 3;
CursorColChar := CursorColChar - 1;
fi;
putCursor();
displayPos();
else
startOfFile();
fi;
corp;
proc cursorUp()void:
if FilePos >= 16 then
unCursor();
FilePos := FilePos - 16;
if CursorLine = 0 then
WindowPos := WindowPos - 16;
CRT_ClearScreen();
displayScreen();
displayStatus();
else
CursorLine := CursorLine - 1;
fi;
putCursor();
displayPos();
else
startOfFile();
fi;
corp;
proc cursorDown()void:
if CursorLine = NLines - 2 then
scrollUp();
fi;
if FilePos < EndPos - 16 then
unCursor();
FilePos := FilePos + 16;
CursorLine := CursorLine + 1;
putCursor();
displayPos();
else
endOfFile();
fi;
corp;
proc cursorHome()void:
bool redraw;
unCursor();
redraw := WindowPos ~= 0;
FilePos := 0;
WindowPos := 0;
CursorLine := 0;
CursorColHex := 9;
CursorColChar := 59;
if redraw then
CRT_ClearScreen();
displayScreen();
displayStatus();
putCursor();
else
putCursor();
displayPos();
fi;
corp;
proc pageForward()void:
ulong pos;
pos := WindowPos + (NLines - 3) * 16;
if pos < EndPos then
WindowPos := pos;
FilePos := FilePos + (NLines - 3) * 16;
if FilePos >= EndPos then
FilePos := EndPos - 1;
CursorLine := (EndPos - WindowPos) / 16 - 1;
CursorColHex := 9 + FilePos % 16 * 3;
CursorColChar := 59 + FilePos % 16;
fi;
CRT_ClearScreen();
displayScreen();
displayStatus();
else
endOfFile();
fi;
corp;
proc pageBackward()void:
if WindowPos ~= 0 then
if WindowPos >= (NLines - 3) * 16 then
WindowPos := WindowPos - (NLines - 3) * 16;
FilePos := FilePos - (NLines - 3) * 16;
else
FilePos := FilePos - WindowPos;
WindowPos := 0;
fi;
CRT_ClearScreen();
displayScreen();
displayStatus();
else
startOfFile();
fi;
corp;
proc getHex()byte:
char ch;
while
ch := CRT_ReadChar();
not (ch >= '0' and ch <= '9' or
ch >= 'a' and ch <= 'f' or
ch >= 'A' and ch <= 'F' or
ch = '\r' or ch = '\b')
do
od;
if ch >= 'A' and ch <= 'F' then
ch - 'A' + 10
elif ch >= 'a' and ch <= 'f' then
ch - 'a' + 10
elif ch = '\r' then
255
elif ch = '\b' then
254
else
ch - '0'
fi
corp;
proc gotoDisplay(ulong pos; bool redraw)void:
if not redraw then
unCursor();
CursorLine := CursorLine + (pos / 16 - FilePos / 16);
fi;
FilePos := pos;
CursorColHex := (FilePos & 0xf) * 3 + 9;
CursorColChar := (FilePos & 0xf) + 59;
if redraw then
CRT_ClearScreen();
CursorLine := 0;
displayScreen();
displayStatus();
else
displayPos();
fi;
putCursor();
corp;
proc goto()void:
ulong pos, endPos;
byte b;
uint p, q;
[POSLEN] byte buff;
err("Enter location to go to");
CRT_Move(NLines - 1, POSCOL);
write(CRTOut; " ");
CRT_Move(NLines - 1, POSCOL);
p := 0;
while
while
b := getHex();
b = 0 and p = 0
do
od;
b ~= 255
do
if b = 254 then
if p ~= 0 then
p := p - 1;
write(CRTOut; "\b \b");
fi;
elif p = POSLEN then
write(CRTOut; '\(0x07)');
else
write(CRTOut; if b < 10 then b + '0' else b - 10 + 'a' fi);
buff[p] := b;
p := p + 1;
fi;
od;
if p = 0 then
clearError();
err("OK - no goto done");
displayPos();
else
q := POSLEN;
while p ~= 0 do
p := p - 1;
q := q - 1;
buff[q] := buff[p];
od;
while q ~= 0 do
q := q - 1;
buff[q] := 0;
od;
pos := (make(buff[0], uint) << 20) +
(make(buff[1], uint) << 16) +
(make(buff[2], uint) << 12) +
(make(buff[3], uint) << 8) +
(make(buff[4], uint) << 4) +
make(buff[5], uint);
if pos = FilePos then
;
elif pos < FilePos then
if pos < WindowPos then
WindowPos := pos & 0xfffff0;
gotoDisplay(pos, true);
else
gotoDisplay(pos, false);
fi;
else
if pos >= EndPos then
endOfFile();
pos := EndPos - 1;
fi;
endPos := WindowPos + (NLines - 1) * 16;
if pos >= endPos then
WindowPos := pos & 0xfffff0;
gotoDisplay(pos, true);
else
gotoDisplay(pos, false);
fi;
fi;
clearError();
fi;
corp;
proc toDec()void:
ulong num;
uint p;
byte b;
err("Enter hex value to convert");
CRT_Move(NLines - 1, POSCOL);
write(CRTOut; " ");
CRT_Move(NLines - 1, POSCOL);
num := 0;
p := 0;
while
while
b := getHex();
b = 0 and p = 0
do
od;
b ~= 255
do
if b = 254 then
if p ~= 0 then
num := num >> 4;
p := p - 1;
write(CRTOut; "\b \b");
fi;
elif p = 8 then
write(CRTOut; '\(0x07)');
else
write(CRTOut; if b < 10 then b + '0' else b - 10 + 'a' fi);
num := (num << 4) + b;
p := p + 1;
fi;
od;
clearError();
if p ~= 0 then
err("Decimal value is ");
CRT_Move(NLines - 1, ERRORCOL + 17);
CRT_EnterHighLight();
write(CRTOut; num : u);
CRT_ExitHighLight();
fi;
CRT_Move(NLines - 1, POSCOL + POSLEN);
for p from POSLEN upto NUMLEN - 1 do
write(CRTOut; '-');
od;
displayPos();
corp;
proc toHex()void:
ulong num;
uint p;
char ch;
err("Enter decimal value to convert");
CRT_Move(NLines - 1, POSCOL);
write(CRTOut; " ");
CRT_Move(NLines - 1, POSCOL);
num := 0;
p := 0;
while
while
while
ch := CRT_ReadChar();
not (ch >= '0' and ch <= '9' or
ch = '\r' or ch = '\b')
do
od;
ch = '0' and p = 0
do
od;
ch ~= '\r'
do
if ch = '\b' then
if p ~= 0 then
num := num / 10;
p := p - 1;
write(CRTOut; "\b \b");
fi;
elif p = NUMLEN then
write(CRTOut; '\(0x07)');
else
write(CRTOut; ch);
num := (num * 10) + (ch - '0');
p := p + 1;
fi;
od;
clearError();
if p ~= 0 then
err("Hex value is ");
CRT_Move(NLines - 1, ERRORCOL + 13);
CRT_EnterHighLight();
write(CRTOut; num : x : -8);
CRT_ExitHighLight();
fi;
CRT_Move(NLines - 1, POSCOL + POSLEN);
for p from POSLEN upto NUMLEN - 1 do
write(CRTOut; '-');
od;
displayPos();
corp;
proc helpScreen()void:
CRT_ClearScreen();
write(CRTOut;
"\n"
"\t\tCommands are:\r\n"
"\n"
"\tESC - exit\r\n"
"\tarrow keys - move cursor\r\n"
"\tshift-left-arrow - move to beginning of file\r\n"
"\tshift-down-arrow - page forward\r\n"
"\tshift-up-arrow - page backward\r\n"
"\tshift-right-arrow - go to specific location\r\n"
"\tRETURN - scrollUp screen\r\n"
"\tF1 - convert decimal value to hex\r\n"
"\tF2 - convert hex value to decimal\r\n"
"\tF3 - toggle hex/char mode\r\n"
"\tF10 - redraw screen\r\n"
"\tothers - replace char when not Read-Only\r\n"
);
CRT_Move(16, 10);
write(CRTOut; " File size: ", EndPos : u : 8,
", hex ", EndPos : x : 6);
CRT_Move(17, 10);
write(CRTOut; "Current position: ", FilePos : u : 8,
", hex ", FilePos : x : 6);
CRT_Continue();
CRT_ClearScreen();
displayScreen();
displayStatus();
corp;
proc writeByte(byte b)void:
if not SeekOut(ChOut, FilePos) then
abort("Write seek failed");
fi;
write(ChOut; b);
cursorForward();
corp;
proc eatTilde()bool:
if getChar() = '~' then
true
else
err("Invalid; Press HELP for help");
false
fi
corp;
proc edit()void:
byte b, b2;
char cmd;
EndPos := GetInMax(ChIn);
displayScreen();
while
CRT_Move(CursorLine,
if Binary then CursorColHex else CursorColChar fi);
cmd := getChar();
cmd ~= '\(0x1b)'
do
if cmd = '\r' then
scrollUp();
elif cmd = CSI then
case getChar()
incase ' ':
case getChar()
incase 'A':
cursorHome();
incase '@':
goto();
default:
err("Invalid; Press HELP for help");
esac;
incase '?':
if eatTilde() then
helpScreen();
fi;
incase 'C':
cursorForward();
incase 'D':
cursorBackward();
incase 'A':
cursorUp();
incase 'B':
cursorDown();
incase 'S':
pageForward();
incase 'T':
pageBackward();
incase '9':
if eatTilde() then
CRT_Reset();
CRT_ClearScreen();
displayScreen();
displayStatus();
fi;
incase '2':
if eatTilde() then
CRT_Move(NLines - 1, HEXCOL);
if Binary then
Binary := false;
write(CRTOut; "char");
else
Binary := true;
write(CRTOut; "hex-");
fi;
fi;
incase '1':
if getChar() = '~' then
toDec();
else
while getChar() ~= '~' do
od;
err("Invalid; Press HELP for help");
fi;
incase '0':
if eatTilde() then
toHex();
fi;
default:
while getChar() ~= '~' do
od;
err("Invalid; Press HELP for help");
esac;
else
if cmd >= ' ' and cmd <= '~' then
if ReadOnly then
err("Modifications not allowed");
elif Binary then
if cmd >= '0' and cmd <= '9' or
cmd >= 'a' and cmd <= 'f' or
cmd >= 'A' and cmd <= 'F' then
b :=
if cmd >= '0' and cmd <= '9' then
cmd - '0'
elif cmd >= 'a' and cmd <= 'f' then
cmd - 'a' + 10
else
cmd - 'A' + 10
fi;
CRT_EnterHighLight();
write(CRTOut;
if b >= 10 then b - 10 + 'a' else b + '0' fi);
CRT_ExitHighLight();
b2 := getHex();
if b2 = 255 then
writeByte(b);
elif b2 = 254 then
putCursor();
else
writeByte(b << 4 + b2);
fi;
else
err("Bad hexadecimal digit");
fi;
else
write(CRTOut; cmd);
CRT_Move(CursorLine, CursorColHex);
write(CRTOut; cmd - '\e' : x : -2);
writeByte(cmd - '\e');
fi;
else
err("Invalid; Press HELP for help");
fi;
fi;
od;
if not ReadOnly then
close(ChOut);
fi;
close(ChIn);
corp;
proc badUse()void:
writeln("Use is: HEdit [-w] file1 ... fileN");
exit(1);
corp;
proc main()void:
*char par;
ReadOnly := true;
Binary := true;
par := GetPar();
if par ~= nil and par* = '-' then
while
par := par + 1;
par* ~= '\e'
do
case par*
incase 'w':
incase 'W':
ReadOnly := false;
default:
badUse();
esac;
od;
par := GetPar();
fi;
if par = nil then
badUse();
fi;
CRT_Initialize("HEdit - press HELP for help", 0, 0);
CRT_AbortDisable();
NLines := CRT_NLines();
NCols := CRT_NCols();
if NCols < 61 then
writeln("HEdit: less than 61 columns - aborting.");
CRT_Abort();
fi;
open(CRTOut, CRT_PutChar);
while par ~= nil do
FilePos := 0;
WindowPos := 0;
CursorLine := 0;
CursorColHex := 9;
CursorColChar := 59;
CRT_ClearScreen();
FileName := par;
if open(ChIn, Fyle, FileName) then
displayStatus();
if not ReadOnly then
ReOpen(ChIn, ChOut);
fi;
if not SeekIn(ChIn, 0) then
err("Empty file - press a key");
pretend(getChar(), void);
else
edit();
fi;
else
displayStatus();
err("No such file - press a key");
pretend(getChar(), void);
fi;
par := GetPar();
od;
close(CRTOut);
CRT_Terminate();
corp;