private static TclObject ScanNumber(byte[] src, int pos, int type)
// Format character from "binary scan"
{
switch (type)
{
case 'c':
{
return(TclInteger.newInstance((sbyte)src[pos]));
}
case 's':
{
short value = (short)((src[pos] & 0xff) + ((src[pos + 1] & 0xff) << 8));
return(TclInteger.newInstance((int)value));
}
case 'S':
{
short value = (short)((src[pos + 1] & 0xff) + ((src[pos] & 0xff) << 8));
return(TclInteger.newInstance((int)value));
}
case 'i':
{
int value = (src[pos] & 0xff) + ((src[pos + 1] & 0xff) << 8) + ((src[pos + 2] & 0xff) << 16) + ((src[pos + 3] & 0xff) << 24);
return(TclInteger.newInstance(value));
}
case 'I':
{
int value = (src[pos + 3] & 0xff) + ((src[pos + 2] & 0xff) << 8) + ((src[pos + 1] & 0xff) << 16) + ((src[pos] & 0xff) << 24);
return(TclInteger.newInstance(value));
}
case 'f':
{
System.IO.MemoryStream ms = new System.IO.MemoryStream(src, pos, 4, false);
System.IO.BinaryReader reader = new System.IO.BinaryReader(ms);
double fvalue = reader.ReadSingle();
reader.Close();
ms.Close();
return(TclDouble.newInstance(fvalue));
}
case 'd':
{
System.IO.MemoryStream ms = new System.IO.MemoryStream(src, pos, 8, false);
System.IO.BinaryReader reader = new System.IO.BinaryReader(ms);
double dvalue = reader.ReadDouble();
reader.Close();
ms.Close();
return(TclDouble.newInstance(dvalue));
}
}
return(null);
}
/// <summary> This procedure is invoked to process the "scan" Tcl command.
/// See the user documentation for details on what it does.
///
/// Each iteration of the cmdProc compares the scanArr's current index to
/// the frmtArr's index. If the chars are equal then the indicies are
/// incremented. If a '%' is found in the frmtArr, the formatSpecifier
/// is parced from the frmtArr, the corresponding value is extracted from
/// the scanArr, and that value is set in the Tcl Interp.
///
/// If the chars are not equal, or the conversion fails, the boolean
/// scanArrDone is set to true, indicating the scanArr is not to be
/// parced and no new values are to be set. However the frmtArr is still
/// parced because of the priority of error messages. In the C version
/// of Tcl, bad format specifiers throw errors before incorrect argument
/// input or other scan errors. Thus we need to parce the entire frmtArr
/// to verify correct formating. This is dumb and inefficient but it is
/// consistent w/ the current C-version of Tcl.
/// </summary>
public TCL.CompletionCode cmdProc(Interp interp, TclObject[] argv)
{
if (argv.Length < 3)
{
throw new TclNumArgsException(interp, 1, argv, "string format ?varName varName ...?");
}
;
StrtoulResult strul; // Return value for parcing the scanArr when
// extracting integers/longs
StrtodResult strd;; // Return value for parcing the scanArr when
// extracting doubles
char[] scanArr; // Array containing parce info
char[] frmtArr; // Array containing info on how to
// parse the scanArr
int scanIndex; // Index into the scan array
int frmtIndex; // Index into the frmt array
int tempIndex; // Temporary index holder
int argIndex; // Index into the current arg
int width; // Stores the user specified result width
int base_; // Base of the integer being converted
int numUnMatched; // Number of fields actually set.
int numMatched; // Number of fields actually matched.
int negateScan; // Mult by result, set to -1 if true
int i; // Generic variable
char ch; // Generic variable
bool cont; // Used in loops to indicate when to stop
bool scanOK; // Set to false if strtoul/strtod fails
bool scanArrDone; // Set to false if strtoul/strtod fails
bool widthFlag; // True is width is specified
bool discardFlag; // If a "%*" is in the formatString dont
// write output to arg
scanArr = argv[1].ToString().ToCharArray();
frmtArr = argv[2].ToString().ToCharArray();
width = base_ = numMatched = numUnMatched = 0;
scanIndex = frmtIndex = 0;
scanOK = true;
scanArrDone = false;
argIndex = 3;
// Skip all (if any) of the white space before getting to a char
frmtIndex = skipWhiteSpace(frmtArr, frmtIndex);
// Search through the frmtArr. If the next char is a '%' parse the
// next chars and determine the type (if any) of the format specifier.
// If the scanArr has been fully searched, do nothing but incerment
// "numUnMatched". The reason to continue the frmtArr search is for
// consistency in output. Previously scan format errors were reported
// before arg input mismatch, so this maintains the same level of error
// checking.
while (frmtIndex < frmtArr.Length)
{
discardFlag = widthFlag = false;
negateScan = 1;
cont = true;
// Parce the format array and read in the correct value from the
// scan array. When the correct value is retrieved, set the
// variable (from argv) in the interp.
if (frmtArr[frmtIndex] == '%')
{
frmtIndex++;
checkOverFlow(interp, frmtArr, frmtIndex);
// Two '%'s in a row, do nothing...
if (frmtArr[frmtIndex] == '%')
{
frmtIndex++;
scanIndex++;
continue;
}
// Check for a discard field flag
if (frmtArr[frmtIndex] == '*')
{
discardFlag = true;
frmtIndex++;
checkOverFlow(interp, frmtArr, frmtIndex);
}
// Check for a width field and accept the 'h', 'l', 'L'
// characters, but do nothing with them.
//
// Note: The order of the width specifier and the other
// chars is unordered, so we need to iterate until all
// of the specifiers are identified.
while (cont)
{
cont = false;
switch (frmtArr[frmtIndex])
{
case 'h':
case 'l':
case 'L': {
// Just ignore these values
frmtIndex++;
cont = true;
break;
}
default: {
if (System.Char.IsDigit(frmtArr[frmtIndex]))
{
strul = Util.strtoul(new string(frmtArr), frmtIndex, base_);
frmtIndex = strul.index;
width = (int)strul.value;
widthFlag = true;
cont = true;
}
}
break;
}
checkOverFlow(interp, frmtArr, frmtIndex);
}
// On all conversion specifiers except 'c', move the
// scanIndex to the next non-whitespace.
ch = frmtArr[frmtIndex];
if ((ch != 'c') && (ch != '[') && !scanArrDone)
{
scanIndex = skipWhiteSpace(scanArr, scanIndex);
}
if (scanIndex >= scanArr.Length)
{
scanArrDone = true;
}
if ((scanIndex < scanArr.Length) && (ch != 'c') && (ch != '['))
{
// Since strtoul dosent take signed numbers, make the
// value positive and store the sign.
if (scanArr[scanIndex] == '-')
{
negateScan = -1;
scanIndex++;
width--;
}
else if (scanArr[scanIndex] == '+')
{
scanIndex++;
width--;
}
// The width+scanIndex might be greater than
// the scanArr so we need to re-adjust when this
// happens.
if (widthFlag && (width + scanIndex > scanArr.Length))
{
width = scanArr.Length - scanIndex;
}
}
if (scanIndex >= scanArr.Length)
{
scanArrDone = true;
}
// Foreach iteration we want strul and strd to be
// null since we error check on this case.
strul = null;
strd = null;
switch (ch)
{
case 'd':
case 'o':
case 'x': {
if (!scanArrDone)
{
if (ch == 'd')
{
base_ = 10;
}
else if (ch == 'o')
{
base_ = 8;
}
else
{
base_ = 16;
}
// If the widthFlag is set then convert only
// "width" characters to an ascii representation,
// else read in until the end of the integer. The
// scanIndex is moved to the point where we stop
// reading in.
if (widthFlag)
{
strul = Util.strtoul(new string(scanArr, 0, width + scanIndex), scanIndex, base_);
}
else
{
strul = Util.strtoul(new string(scanArr), scanIndex, base_);
}
if (strul.errno != 0)
{
scanOK = false;
break;
}
scanIndex = strul.index;
if (!discardFlag)
{
i = (int)strul.value * negateScan;
if (argIndex == argv.Length)
{
numMatched--;
}
else
{
testAndSetVar(interp, argv, argIndex++, TclInteger.newInstance(i));
}
}
}
break;
}
case 'c': {
if (widthFlag)
{
errorCharFieldWidth(interp);
}
if (!discardFlag && !scanArrDone)
{
testAndSetVar(interp, argv, argIndex++, TclInteger.newInstance(scanArr[scanIndex++]));
}
break;
}
case 's': {
if (!scanArrDone)
{
// If the widthFlag is set then read only "width"
// characters into the string, else read in until
// the first whitespace or endArr is found. The
// scanIndex is moved to the point where we stop
// reading in.
tempIndex = scanIndex;
if (!widthFlag)
{
width = scanArr.Length;
}
for (i = 0; (scanIndex < scanArr.Length) && (i < width); i++)
{
ch = scanArr[scanIndex];
if ((ch == ' ') || (ch == '\n') || (ch == '\r') || (ch == '\t') || (ch == '\f'))
{
break;
}
scanIndex++;
}
if (!discardFlag)
{
string str = new string(scanArr, tempIndex, scanIndex - tempIndex);
testAndSetVar(interp, argv, argIndex++, TclString.newInstance(str));
}
}
break;
}
case 'e':
case 'f':
case 'g': {
if (!scanArrDone)
{
// If the wisthFlag is set then read only "width"
// characters into the string, else read in until
// the first whitespace or endArr is found. The
// scanIndex is moved to the point where we stop
// reading in.
if (widthFlag)
{
strd = Util.strtod(new string(scanArr, 0, width + scanIndex), scanIndex);
}
else
{
strd = Util.strtod(new string(scanArr), scanIndex);
}
if (strd.errno != 0)
{
scanOK = false;
break;
}
scanIndex = strd.index;
if (!discardFlag)
{
double d = strd.value * negateScan;
testAndSetVar(interp, argv, argIndex++, TclDouble.newInstance(d));
}
}
break;
}
case '[': {
bool charMatchFound = false;
bool charNotMatch = false;
char[] tempArr;
int startIndex;
int endIndex;
string unmatched = "unmatched [ in format string";
if ((++frmtIndex) >= frmtArr.Length)
{
throw new TclException(interp, unmatched);
}
if (frmtArr[frmtIndex] == '^')
{
charNotMatch = true;
frmtIndex += 2;
}
else
{
frmtIndex++;
}
tempIndex = frmtIndex - 1;
if (frmtIndex >= frmtArr.Length)
{
throw new TclException(interp, unmatched);
}
// Extract the list of chars for matching.
while (frmtArr[frmtIndex] != ']')
{
if ((++frmtIndex) >= frmtArr.Length)
{
throw new TclException(interp, unmatched);
}
}
tempArr = new string(frmtArr, tempIndex, frmtIndex - tempIndex).ToCharArray();
startIndex = scanIndex;
if (charNotMatch)
{
// Format specifier contained a '^' so interate
// until one of the chars in tempArr is found.
while (scanOK && !charMatchFound)
{
if (scanIndex >= scanArr.Length)
{
scanOK = false;
break;
}
for (i = 0; i < tempArr.Length; i++)
{
if (tempArr[i] == scanArr[scanIndex])
{
charMatchFound = true;
break;
}
}
if (widthFlag && ((scanIndex - startIndex) >= width))
{
break;
}
if (!charMatchFound)
{
scanIndex++;
}
}
}
else
{
// Iterate until the char in the scanArr is not
// in the tempArr.
charMatchFound = true;
while (scanOK && charMatchFound)
{
if (scanIndex >= scanArr.Length)
{
scanOK = false;
break;
}
charMatchFound = false;
for (i = 0; i < tempArr.Length; i++)
{
if (tempArr[i] == scanArr[scanIndex])
{
charMatchFound = true;
break;
}
}
if (widthFlag && (scanIndex - startIndex) >= width)
{
break;
}
if (charMatchFound)
{
scanIndex++;
}
}
}
// Indicates nothing was found.
endIndex = scanIndex - startIndex;
if (endIndex <= 0)
{
scanOK = false;
break;
}
if (!discardFlag)
{
string str = new string(scanArr, startIndex, endIndex);
testAndSetVar(interp, argv, argIndex++, TclString.newInstance(str));
}
break;
}
default: {
errorBadField(interp, ch);
}
break;
}
// As long as the scan was successful (scanOK), the format
// specifier did not contain a '*' (discardFlag), and
// we are not at the end of the scanArr (scanArrDone);
// increment the num of vars set in the interp. Otherwise
// increment the number of valid format specifiers.
if (scanOK && !discardFlag && !scanArrDone)
{
numMatched++;
}
else if ((scanArrDone || !scanOK) && !discardFlag)
{
numUnMatched++;
}
frmtIndex++;
}
else if (scanIndex < scanArr.Length && scanArr[scanIndex] == frmtArr[frmtIndex])
{
// No '%' was found, but the characters matched
scanIndex++;
frmtIndex++;
}
else
{
// No '%' found and the characters int frmtArr & scanArr
// did not match.
frmtIndex++;
}
}
// The numMatched is the return value: a count of the num of vars set.
// While the numUnMatched is the number of formatSpecifiers that
// passed the parsing stage, but did not match anything in the scanArr.
if ((numMatched + numUnMatched) != (argv.Length - 3))
{
errorDiffVars(interp);
}
interp.setResult(TclInteger.newInstance(numMatched));
return(TCL.CompletionCode.RETURN);
}
public static TclObject Tcl_NewDoubleObj(double value)
{
return(TclDouble.newInstance(value));
}