private const char FORMAT_END = ' '; // End of format was found.
public TCL.CompletionCode CmdProc(Interp interp, TclObject[] argv)
{
int arg; // Index of next argument to consume.
char[] format = null; // User specified format string.
char cmd; // Current format character.
int cursor; // Current position within result buffer.
int maxPos; // Greatest position within result buffer that cursor has visited.
int value = 0; // Current integer value to be packed.
int offset, size = 0, length; // Initialized to avoid compiler warning.
if (argv.Length < 2)
{
throw new TclNumArgsException(interp, 1, argv, "option ?arg arg ...?");
}
int cmdIndex = TclIndex.Get(interp, argv[1], _validCmds, "option", 0);
switch (cmdIndex)
{
case CMD_FORMAT:
{
if (argv.Length < 3)
{
throw new TclNumArgsException(interp, 2, argv, "formatString ?arg arg ...?");
}
// To avoid copying the data, we format the string in two passes. The first pass computes the size of the output buffer. The
// second pass places the formatted data into the buffer.
format = argv[2].ToString().ToCharArray();
arg = 3;
length = 0;
offset = 0;
int parsePos = 0;
while ((cmd = GetFormatSpec(format, ref parsePos)) != FORMAT_END)
{
int count = GetFormatCount(format, ref parsePos);
switch (cmd)
{
case 'a':
case 'A':
case 'b':
case 'B':
case 'h':
case 'H':
{
// For string-type specifiers, the count corresponds to the number of bytes in a single argument.
if (arg >= argv.Length)
{
MissingArg(interp);
}
if (count == BINARY_ALL)
{
count = TclByteArray.getLength(interp, argv[arg]);
}
else if (count == BINARY_NOCOUNT)
{
count = 1;
}
arg++;
switch (cmd)
{
case 'a':
case 'A':
offset += count;
break;
case 'b':
case 'B':
offset += (count + 7) / 8;
break;
case 'h':
case 'H':
offset += (count + 1) / 2;
break;
}
break;
}
case 'c':
case 's':
case 'S':
case 'i':
case 'I':
case 'f':
case 'd':
{
if (arg >= argv.Length)
{
MissingArg(interp);
}
switch (cmd)
{
case 'c':
size = 1;
break;
case 's':
case 'S':
size = 2;
break;
case 'i':
case 'I':
size = 4;
break;
case 'f':
size = 4;
break;
case 'd':
size = 8;
break;
}
// For number-type specifiers, the count corresponds to the number of elements in the list stored in
// a single argument. If no count is specified, then the argument is taken as a single non-list value.
if (count == BINARY_NOCOUNT)
{
arg++;
count = 1;
}
else
{
int listc = TclList.getLength(interp, argv[arg++]);
if (count == BINARY_ALL)
{
count = listc;
}
else if (count > listc)
{
throw new TclException(interp, "number of elements in list" + " does not match count");
}
}
offset += count * size;
break;
}
case 'x':
{
if (count == BINARY_ALL)
{
throw new TclException(interp, "cannot use \"*\"" + " in format string with \"x\"");
}
if (count == BINARY_NOCOUNT)
{
count = 1;
}
offset += count;
break;
}
case 'X':
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count > offset || count == BINARY_ALL)
{
count = offset;
}
if (offset > length)
{
length = offset;
}
offset -= count;
break;
}
case '@':
{
if (offset > length)
{
length = offset;
}
if (count == BINARY_ALL)
{
offset = length;
}
else if (count == BINARY_NOCOUNT)
{
AlephWithoutCount(interp);
}
else
{
offset = count;
}
break;
}
default:
{
BadField(interp, cmd);
}
break;
}
}
if (offset > length)
{
length = offset;
}
if (length == 0)
{
return(TCL.CompletionCode.RETURN);
}
// Prepare the result object by preallocating the calculated number of bytes and filling with nulls.
TclObject resultObj = TclByteArray.NewInstance();
byte[] resultBytes = TclByteArray.SetLength(interp, resultObj, length);
interp.SetResult(resultObj);
// Pack the data into the result object. Note that we can skip the error checking during this pass, since we have already parsed the string once.
arg = 3;
cursor = 0;
maxPos = cursor;
parsePos = 0;
while ((cmd = GetFormatSpec(format, ref parsePos)) != FORMAT_END)
{
int count = GetFormatCount(format, ref parsePos);
if (count == 0 && cmd != '@')
{
arg++;
continue;
}
switch (cmd)
{
case 'a':
case 'A':
{
byte pad = (cmd == 'a' ? (byte)0 : (byte)SupportClass.Identity(' '));
byte[] bytes = TclByteArray.getBytes(interp, argv[arg++]);
length = bytes.Length;
if (count == BINARY_ALL)
{
count = length;
}
else if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (length >= count)
{
Array.Copy(bytes, 0, resultBytes, cursor, count);
}
else
{
Array.Copy(bytes, 0, resultBytes, cursor, length);
for (int ix = 0; ix < count - length; ix++)
{
resultBytes[cursor + length + ix] = pad;
}
}
cursor += count;
break;
}
case 'b':
case 'B':
{
char[] str = argv[arg++].ToString().ToCharArray();
if (count == BINARY_ALL)
{
count = str.Length;
}
else if (count == BINARY_NOCOUNT)
{
count = 1;
}
int last = cursor + ((count + 7) / 8);
if (count > str.Length)
{
count = str.Length;
}
if (cmd == 'B')
{
for (offset = 0; offset < count; offset++)
{
value <<= 1;
if (str[offset] == '1')
{
value |= 1;
}
else if (str[offset] != '0')
{
ExpectedButGot(interp, "binary", new string(str));
}
if (((offset + 1) % 8) == 0)
{
resultBytes[cursor++] = (byte)value;
value = 0;
}
}
}
else
{
for (offset = 0; offset < count; offset++)
{
value >>= 1;
if (str[offset] == '1')
{
value |= 128;
}
else if (str[offset] != '0')
{
ExpectedButGot(interp, "binary", new string(str));
}
if (((offset + 1) % 8) == 0)
{
resultBytes[cursor++] = (byte)value;
value = 0;
}
}
}
if ((offset % 8) != 0)
{
if (cmd == 'B')
{
value <<= 8 - (offset % 8);
}
else
{
value >>= 8 - (offset % 8);
}
resultBytes[cursor++] = (byte)value;
}
while (cursor < last)
{
resultBytes[cursor++] = 0;
}
break;
}
case 'h':
case 'H':
{
char[] str = argv[arg++].ToString().ToCharArray();
if (count == BINARY_ALL)
{
count = str.Length;
}
else if (count == BINARY_NOCOUNT)
{
count = 1;
}
int last = cursor + ((count + 1) / 2);
if (count > str.Length)
{
count = str.Length;
}
if (cmd == 'H')
{
for (offset = 0; offset < count; offset++)
{
value <<= 4;
int c = HEXDIGITS.IndexOf(Char.ToLower(str[offset]));
if (c < 0)
{
ExpectedButGot(interp, "hexadecimal", new string(str));
}
value |= (c & 0xf);
if ((offset % 2) != 0)
{
resultBytes[cursor++] = (byte)value;
value = 0;
}
}
}
else
{
for (offset = 0; offset < count; offset++)
{
value >>= 4;
int c = HEXDIGITS.IndexOf(Char.ToLower(str[offset]));
if (c < 0)
{
ExpectedButGot(interp, "hexadecimal", new string(str));
}
value |= ((c << 4) & 0xf0);
if ((offset % 2) != 0)
{
resultBytes[cursor++] = (byte)value;
value = 0;
}
}
}
if ((offset % 2) != 0)
{
if (cmd == 'H')
{
value <<= 4;
}
else
{
value >>= 4;
}
resultBytes[cursor++] = (byte)value;
}
while (cursor < last)
{
resultBytes[cursor++] = 0;
}
break;
}
case 'c':
case 's':
case 'S':
case 'i':
case 'I':
case 'f':
case 'd':
{
TclObject[] listv;
if (count == BINARY_NOCOUNT)
{
listv = new TclObject[1];
listv[0] = argv[arg++];
count = 1;
}
else
{
listv = TclList.getElements(interp, argv[arg++]);
if (count == BINARY_ALL)
{
count = listv.Length;
}
}
for (int ix = 0; ix < count; ix++)
{
cursor = FormatNumber(interp, cmd, listv[ix], resultBytes, cursor);
}
break;
}
case 'x':
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
for (int ix = 0; ix < count; ix++)
{
resultBytes[cursor++] = 0;
}
break;
}
case 'X':
{
if (cursor > maxPos)
{
maxPos = cursor;
}
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count == BINARY_ALL || count > cursor)
{
cursor = 0;
}
else
{
cursor -= count;
}
break;
}
case '@':
{
if (cursor > maxPos)
{
maxPos = cursor;
}
if (count == BINARY_ALL)
{
cursor = maxPos;
}
else
{
cursor = count;
}
break;
}
}
}
break;
}
case CMD_SCAN:
{
if (argv.Length < 4)
{
throw new TclNumArgsException(interp, 2, argv, "value formatString ?varName varName ...?");
}
byte[] src = TclByteArray.getBytes(interp, argv[2]);
length = src.Length;
format = argv[3].ToString().ToCharArray();
arg = 4;
cursor = 0;
offset = 0;
int parsePos = 0;
while ((cmd = GetFormatSpec(format, ref parsePos)) != FORMAT_END)
{
int count = GetFormatCount(format, ref parsePos);
switch (cmd)
{
case 'a':
case 'A':
{
if (arg >= argv.Length)
{
MissingArg(interp);
}
if (count == BINARY_ALL)
{
count = length - offset;
}
else
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count > length - offset)
{
break;
}
}
size = count;
// Trim trailing nulls and spaces, if necessary.
if (cmd == 'A')
{
while (size > 0)
{
if (src[offset + size - 1] != '\x0000' && src[offset + size - 1] != ' ')
{
break;
}
size--;
}
}
interp.SetVar(argv[arg++], TclByteArray.NewInstance(src, offset, size), 0);
offset += count;
break;
}
case 'b':
case 'B':
{
if (arg >= argv.Length)
{
MissingArg(interp);
}
if (count == BINARY_ALL)
{
count = (length - offset) * 8;
}
else
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count > (length - offset) * 8)
{
break;
}
}
StringBuilder s = new StringBuilder(count);
int thisOffset = offset;
if (cmd == 'b')
{
for (int ix = 0; ix < count; ix++)
{
if ((ix % 8) != 0)
{
value >>= 1;
}
else
{
value = src[thisOffset++];
}
s.Append((value & 1) != 0 ? '1' : '0');
}
}
else
{
for (int ix = 0; ix < count; ix++)
{
if ((ix % 8) != 0)
{
value <<= 1;
}
else
{
value = src[thisOffset++];
}
s.Append((value & 0x80) != 0 ? '1' : '0');
}
}
interp.SetVar(argv[arg++], TclString.NewInstance(s.ToString()), 0);
offset += (count + 7) / 8;
break;
}
case 'h':
case 'H':
{
if (arg >= argv.Length)
{
MissingArg(interp);
}
if (count == BINARY_ALL)
{
count = (length - offset) * 2;
}
else
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count > (length - offset) * 2)
{
break;
}
}
StringBuilder s = new StringBuilder(count);
int thisOffset = offset;
if (cmd == 'h')
{
for (int ix = 0; ix < count; ix++)
{
if ((ix % 2) != 0)
{
value >>= 4;
}
else
{
value = src[thisOffset++];
}
s.Append(HEXDIGITS[value & 0xf]);
}
}
else
{
for (int ix = 0; ix < count; ix++)
{
if ((ix % 2) != 0)
{
value <<= 4;
}
else
{
value = src[thisOffset++];
}
s.Append(HEXDIGITS[value >> 4 & 0xf]);
}
}
interp.SetVar(argv[arg++], TclString.NewInstance(s.ToString()), 0);
offset += (count + 1) / 2;
break;
}
case 'c':
case 's':
case 'S':
case 'i':
case 'I':
case 'f':
case 'd':
{
if (arg >= argv.Length)
{
MissingArg(interp);
}
switch (cmd)
{
case 'c':
size = 1;
break;
case 's':
case 'S':
size = 2;
break;
case 'i':
case 'I':
size = 4;
break;
case 'f':
size = 4;
break;
case 'd':
size = 8;
break;
}
TclObject valueObj;
if (count == BINARY_NOCOUNT)
{
if (length - offset < size)
{
break;
}
valueObj = ScanNumber(src, offset, cmd);
offset += size;
}
else
{
if (count == BINARY_ALL)
{
count = (length - offset) / size;
}
if (length - offset < count * size)
{
break;
}
valueObj = TclList.NewInstance();
int thisOffset = offset;
for (int ix = 0; ix < count; ix++)
{
TclList.Append(null, valueObj, ScanNumber(src, thisOffset, cmd));
thisOffset += size;
}
offset += count * size;
}
interp.SetVar(argv[arg++], valueObj, 0);
break;
}
case 'x':
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count == BINARY_ALL || count > length - offset)
{
offset = length;
}
else
{
offset += count;
}
break;
}
case 'X':
{
if (count == BINARY_NOCOUNT)
{
count = 1;
}
if (count == BINARY_ALL || count > offset)
{
offset = 0;
}
else
{
offset -= count;
}
break;
}
case '@':
{
if (count == BINARY_NOCOUNT)
{
AlephWithoutCount(interp);
}
if (count == BINARY_ALL || count > length)
{
offset = length;
}
else
{
offset = count;
}
break;
}
default:
{
BadField(interp, cmd);
}
break;
}
}
// Set the result to the last position of the cursor.
interp.SetResult(arg - 4);
}
break;
}
return(TCL.CompletionCode.RETURN);
}