source: downloads/tcl8.5.2/generic/tclScan.c @ 63

/*
 * tclScan.c --
 *
 *      This file contains the implementation of the "scan" command.
 *
 * Copyright (c) 1998 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclScan.c,v 1.27 2007/12/13 15:23:20 dgp Exp $
 */

#include "tclInt.h"

/*
 * Flag values used by Tcl_ScanObjCmd.
 */

#define SCAN_NOSKIP     0x1             /* Don't skip blanks. */
#define SCAN_SUPPRESS   0x2             /* Suppress assignment. */
#define SCAN_UNSIGNED   0x4             /* Read an unsigned value. */
#define SCAN_WIDTH      0x8             /* A width value was supplied. */

#define SCAN_LONGER     0x400           /* Asked for a wide value. */
#define SCAN_BIG        0x800           /* Asked for a bignum value. */

/*
 * The following structure contains the information associated with a
 * character set.
 */

typedef struct CharSet {
    int exclude;                /* 1 if this is an exclusion set. */
    int nchars;
    Tcl_UniChar *chars;
    int nranges;
    struct Range {
        Tcl_UniChar start;
        Tcl_UniChar end;
    } *ranges;
} CharSet;

/*
 * Declarations for functions used only in this file.
 */

static char *           BuildCharSet(CharSet *cset, char *format);
static int              CharInSet(CharSet *cset, int ch);
static void             ReleaseCharSet(CharSet *cset);
static int              ValidateFormat(Tcl_Interp *interp, char *format,
                            int numVars, int *totalVars);

/*
 *----------------------------------------------------------------------
 *
 * BuildCharSet --
 *
 *      This function examines a character set format specification and builds
 *      a CharSet containing the individual characters and character ranges
 *      specified.
 *
 * Results:
 *      Returns the next format position.
 *
 * Side effects:
 *      Initializes the charset.
 *
 *----------------------------------------------------------------------
 */

static char *
BuildCharSet(
    CharSet *cset,
    char *format)               /* Points to first char of set. */
{
    Tcl_UniChar ch, start;
    int offset, nranges;
    char *end;

    memset(cset, 0, sizeof(CharSet));

    offset = Tcl_UtfToUniChar(format, &ch);
    if (ch == '^') {
        cset->exclude = 1;
        format += offset;
        offset = Tcl_UtfToUniChar(format, &ch);
    }
    end = format + offset;

    /*
     * Find the close bracket so we can overallocate the set.
     */

    if (ch == ']') {
        end += Tcl_UtfToUniChar(end, &ch);
    }
    nranges = 0;
    while (ch != ']') {
        if (ch == '-') {
            nranges++;
        }
        end += Tcl_UtfToUniChar(end, &ch);
    }

    cset->chars = (Tcl_UniChar *)
            ckalloc(sizeof(Tcl_UniChar) * (end - format - 1));
    if (nranges > 0) {
        cset->ranges = (struct Range *) ckalloc(sizeof(struct Range)*nranges);
    } else {
        cset->ranges = NULL;
    }

    /*
     * Now build the character set.
     */

    cset->nchars = cset->nranges = 0;
    format += Tcl_UtfToUniChar(format, &ch);
    start = ch;
    if (ch == ']' || ch == '-') {
        cset->chars[cset->nchars++] = ch;
        format += Tcl_UtfToUniChar(format, &ch);
    }
    while (ch != ']') {
        if (*format == '-') {
            /*
             * This may be the first character of a range, so don't add it
             * yet.
             */

            start = ch;
        } else if (ch == '-') {
            /*
             * Check to see if this is the last character in the set, in which
             * case it is not a range and we should add the previous character
             * as well as the dash.
             */

            if (*format == ']') {
                cset->chars[cset->nchars++] = start;
                cset->chars[cset->nchars++] = ch;
            } else {
                format += Tcl_UtfToUniChar(format, &ch);

                /*
                 * Check to see if the range is in reverse order.
                 */

                if (start < ch) {
                    cset->ranges[cset->nranges].start = start;
                    cset->ranges[cset->nranges].end = ch;
                } else {
                    cset->ranges[cset->nranges].start = ch;
                    cset->ranges[cset->nranges].end = start;
                }
                cset->nranges++;
            }
        } else {
            cset->chars[cset->nchars++] = ch;
        }
        format += Tcl_UtfToUniChar(format, &ch);
    }
    return format;
}

/*
 *----------------------------------------------------------------------
 *
 * CharInSet --
 *
 *      Check to see if a character matches the given set.
 *
 * Results:
 *      Returns non-zero if the character matches the given set.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static int
CharInSet(
    CharSet *cset,
    int c)                      /* Character to test, passed as int because of
                                 * non-ANSI prototypes. */
{
    Tcl_UniChar ch = (Tcl_UniChar) c;
    int i, match = 0;

    for (i = 0; i < cset->nchars; i++) {
        if (cset->chars[i] == ch) {
            match = 1;
            break;
        }
    }
    if (!match) {
        for (i = 0; i < cset->nranges; i++) {
            if ((cset->ranges[i].start <= ch) && (ch <= cset->ranges[i].end)) {
                match = 1;
                break;
            }
        }
    }
    return (cset->exclude ? !match : match);
}

/*
 *----------------------------------------------------------------------
 *
 * ReleaseCharSet --
 *
 *      Free the storage associated with a character set.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static void
ReleaseCharSet(
    CharSet *cset)
{
    ckfree((char *)cset->chars);
    if (cset->ranges) {
        ckfree((char *)cset->ranges);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ValidateFormat --
 *
 *      Parse the format string and verify that it is properly formed and that
 *      there are exactly enough variables on the command line.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      May place an error in the interpreter result.
 *
 *----------------------------------------------------------------------
 */

static int
ValidateFormat(
    Tcl_Interp *interp,         /* Current interpreter. */
    char *format,               /* The format string. */
    int numVars,                /* The number of variables passed to the scan
                                 * command. */
    int *totalSubs)             /* The number of variables that will be
                                 * required. */
{
    int gotXpg, gotSequential, value, i, flags;
    char *end;
    Tcl_UniChar ch;
    int objIndex, xpgSize, nspace = numVars;
    int *nassign = (int *) TclStackAlloc(interp, nspace * sizeof(int));
    char buf[TCL_UTF_MAX+1];

    /*
     * Initialize an array that records the number of times a variable is
     * assigned to by the format string. We use this to detect if a variable
     * is multiply assigned or left unassigned.
     */

    for (i = 0; i < nspace; i++) {
        nassign[i] = 0;
    }

    xpgSize = objIndex = gotXpg = gotSequential = 0;

    while (*format != '\0') {
        format += Tcl_UtfToUniChar(format, &ch);

        flags = 0;

        if (ch != '%') {
            continue;
        }
        format += Tcl_UtfToUniChar(format, &ch);
        if (ch == '%') {
            continue;
        }
        if (ch == '*') {
            flags |= SCAN_SUPPRESS;
            format += Tcl_UtfToUniChar(format, &ch);
            goto xpgCheckDone;
        }

        if ((ch < 0x80) && isdigit(UCHAR(ch))) {        /* INTL: "C" locale. */
            /*
             * Check for an XPG3-style %n$ specification. Note: there must
             * not be a mixture of XPG3 specs and non-XPG3 specs in the same
             * format string.
             */

            value = strtoul(format-1, &end, 10);        /* INTL: "C" locale. */
            if (*end != '$') {
                goto notXpg;
            }
            format = end+1;
            format += Tcl_UtfToUniChar(format, &ch);
            gotXpg = 1;
            if (gotSequential) {
                goto mixedXPG;
            }
            objIndex = value - 1;
            if ((objIndex < 0) || (numVars && (objIndex >= numVars))) {
                goto badIndex;
            } else if (numVars == 0) {
                /*
                 * In the case where no vars are specified, the user can
                 * specify %9999$ legally, so we have to consider special
                 * rules for growing the assign array. 'value' is guaranteed
                 * to be > 0.
                 */
                xpgSize = (xpgSize > value) ? xpgSize : value;
            }
            goto xpgCheckDone;
        }

    notXpg:
        gotSequential = 1;
        if (gotXpg) {
        mixedXPG:
            Tcl_SetResult(interp,
                    "cannot mix \"%\" and \"%n$\" conversion specifiers",
                    TCL_STATIC);
            goto error;
        }

    xpgCheckDone:
        /*
         * Parse any width specifier.
         */

        if ((ch < 0x80) && isdigit(UCHAR(ch))) {        /* INTL: "C" locale. */
            value = strtoul(format-1, &format, 10);     /* INTL: "C" locale. */
            flags |= SCAN_WIDTH;
            format += Tcl_UtfToUniChar(format, &ch);
        }

        /*
         * Handle any size specifier.
         */

        switch (ch) {
        case 'l':
            if (*format == 'l') {
                flags |= SCAN_BIG;
                format += 1;
                format += Tcl_UtfToUniChar(format, &ch);
                break;
            }
        case 'L':
            flags |= SCAN_LONGER;
        case 'h':
            format += Tcl_UtfToUniChar(format, &ch);
        }

        if (!(flags & SCAN_SUPPRESS) && numVars && (objIndex >= numVars)) {
            goto badIndex;
        }

        /*
         * Handle the various field types.
         */

        switch (ch) {
        case 'c':
            if (flags & SCAN_WIDTH) {
                Tcl_SetResult(interp,
                        "field width may not be specified in %c conversion",
                        TCL_STATIC);
                goto error;
            }
            /*
             * Fall through!
             */
        case 'n':
        case 's':
            if (flags & (SCAN_LONGER|SCAN_BIG)) {
            invalidFieldSize:
                buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
                Tcl_AppendResult(interp,
                        "field size modifier may not be specified in %", buf,
                        " conversion", NULL);
                goto error;
            }
            /*
             * Fall through!
             */
        case 'd':
        case 'e':
        case 'f':
        case 'g':
        case 'i':
        case 'o':
        case 'x':
            break;
        case 'u':
            if (flags & SCAN_BIG) {
                Tcl_SetResult(interp,
                        "unsigned bignum scans are invalid", TCL_STATIC);
                goto error;
            }
            break;
            /*
             * Bracket terms need special checking
             */
        case '[':
            if (flags & (SCAN_LONGER|SCAN_BIG)) {
                goto invalidFieldSize;
            }
            if (*format == '\0') {
                goto badSet;
            }
            format += Tcl_UtfToUniChar(format, &ch);
            if (ch == '^') {
                if (*format == '\0') {
                    goto badSet;
                }
                format += Tcl_UtfToUniChar(format, &ch);
            }
            if (ch == ']') {
                if (*format == '\0') {
                    goto badSet;
                }
                format += Tcl_UtfToUniChar(format, &ch);
            }
            while (ch != ']') {
                if (*format == '\0') {
                    goto badSet;
                }
                format += Tcl_UtfToUniChar(format, &ch);
            }
            break;
        badSet:
            Tcl_SetResult(interp, "unmatched [ in format string",
                    TCL_STATIC);
            goto error;
        default:
            {
                char buf[TCL_UTF_MAX+1];

                buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
                Tcl_AppendResult(interp, "bad scan conversion character \"",
                        buf, "\"", NULL);
                goto error;
            }
        }
        if (!(flags & SCAN_SUPPRESS)) {
            if (objIndex >= nspace) {
                /*
                 * Expand the nassign buffer. If we are using XPG specifiers,
                 * make sure that we grow to a large enough size. xpgSize is
                 * guaranteed to be at least one larger than objIndex.
                 */

                value = nspace;
                if (xpgSize) {
                    nspace = xpgSize;
                } else {
                    nspace += 16;       /* formerly STATIC_LIST_SIZE */
                }
                nassign = (int *) TclStackRealloc(interp, nassign,
                        nspace * sizeof(int));
                for (i = value; i < nspace; i++) {
                    nassign[i] = 0;
                }
            }
            nassign[objIndex]++;
            objIndex++;
        }
    }

    /*
     * Verify that all of the variable were assigned exactly once.
     */

    if (numVars == 0) {
        if (xpgSize) {
            numVars = xpgSize;
        } else {
            numVars = objIndex;
        }
    }
    if (totalSubs) {
        *totalSubs = numVars;
    }
    for (i = 0; i < numVars; i++) {
        if (nassign[i] > 1) {
            Tcl_SetResult(interp,
                    "variable is assigned by multiple \"%n$\" conversion specifiers",
                    TCL_STATIC);
            goto error;
        } else if (!xpgSize && (nassign[i] == 0)) {
            /*
             * If the space is empty, and xpgSize is 0 (means XPG wasn't used,
             * and/or numVars != 0), then too many vars were given
             */

            Tcl_SetResult(interp,
                    "variable is not assigned by any conversion specifiers",
                    TCL_STATIC);
            goto error;
        }
    }

    TclStackFree(interp, nassign);
    return TCL_OK;

  badIndex:
    if (gotXpg) {
        Tcl_SetResult(interp, "\"%n$\" argument index out of range",
                TCL_STATIC);
    } else {
        Tcl_SetResult(interp,
                "different numbers of variable names and field specifiers",
                TCL_STATIC);
    }

  error:
    TclStackFree(interp, nassign);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ScanObjCmd --
 *
 *      This function is invoked to process the "scan" Tcl command. See the
 *      user documentation for details on what it does.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *----------------------------------------------------------------------
 */

        /* ARGSUSED */
int
Tcl_ScanObjCmd(
    ClientData dummy,           /* Not used. */
    Tcl_Interp *interp,         /* Current interpreter. */
    int objc,                   /* Number of arguments. */
    Tcl_Obj *CONST objv[])      /* Argument objects. */
{
    char *format;
    int numVars, nconversions, totalVars = -1;
    int objIndex, offset, i, result, code;
    long value;
    CONST char *string, *end, *baseString;
    char op = 0;
    int width, underflow = 0;
    Tcl_WideInt wideValue;
    Tcl_UniChar ch, sch;
    Tcl_Obj **objs = NULL, *objPtr = NULL;
    int flags;
    char buf[513];              /* Temporary buffer to hold scanned number
                                 * strings before they are passed to
                                 * strtoul. */

    if (objc < 3) {
        Tcl_WrongNumArgs(interp, 1, objv,
                "string format ?varName varName ...?");
        return TCL_ERROR;
    }

    format = Tcl_GetStringFromObj(objv[2], NULL);
    numVars = objc-3;

    /*
     * Check for errors in the format string.
     */

    if (ValidateFormat(interp, format, numVars, &totalVars) == TCL_ERROR) {
        return TCL_ERROR;
    }

    /*
     * Allocate space for the result objects.
     */

    if (totalVars > 0) {
        objs = (Tcl_Obj **) ckalloc(sizeof(Tcl_Obj*) * totalVars);
        for (i = 0; i < totalVars; i++) {
            objs[i] = NULL;
        }
    }

    string = Tcl_GetStringFromObj(objv[1], NULL);
    baseString = string;

    /*
     * Iterate over the format string filling in the result objects until we
     * reach the end of input, the end of the format string, or there is a
     * mismatch.
     */

    objIndex = 0;
    nconversions = 0;
    while (*format != '\0') {
        int parseFlag = TCL_PARSE_NO_WHITESPACE;
        format += Tcl_UtfToUniChar(format, &ch);

        flags = 0;

        /*
         * If we see whitespace in the format, skip whitespace in the string.
         */

        if (Tcl_UniCharIsSpace(ch)) {
            offset = Tcl_UtfToUniChar(string, &sch);
            while (Tcl_UniCharIsSpace(sch)) {
                if (*string == '\0') {
                    goto done;
                }
                string += offset;
                offset = Tcl_UtfToUniChar(string, &sch);
            }
            continue;
        }

        if (ch != '%') {
        literal:
            if (*string == '\0') {
                underflow = 1;
                goto done;
            }
            string += Tcl_UtfToUniChar(string, &sch);
            if (ch != sch) {
                goto done;
            }
            continue;
        }

        format += Tcl_UtfToUniChar(format, &ch);
        if (ch == '%') {
            goto literal;
        }

        /*
         * Check for assignment suppression ('*') or an XPG3-style assignment
         * ('%n$').
         */

        if (ch == '*') {
            flags |= SCAN_SUPPRESS;
            format += Tcl_UtfToUniChar(format, &ch);
        } else if ((ch < 0x80) && isdigit(UCHAR(ch))) { /* INTL: "C" locale. */
            char *formatEnd;
            value = strtoul(format-1, &formatEnd, 10);/* INTL: "C" locale. */
            if (*formatEnd == '$') {
                format = formatEnd+1;
                format += Tcl_UtfToUniChar(format, &ch);
                objIndex = (int) value - 1;
            }
        }

        /*
         * Parse any width specifier.
         */

        if ((ch < 0x80) && isdigit(UCHAR(ch))) {        /* INTL: "C" locale. */
            width = (int) strtoul(format-1, &format, 10);/* INTL: "C" locale. */
            format += Tcl_UtfToUniChar(format, &ch);
        } else {
            width = 0;
        }

        /*
         * Handle any size specifier.
         */

        switch (ch) {
        case 'l':
            if (*format == 'l') {
                flags |= SCAN_BIG;
                format += 1;
                format += Tcl_UtfToUniChar(format, &ch);
                break;
            }
        case 'L':
            flags |= SCAN_LONGER;
            /*
             * Fall through so we skip to the next character.
             */
        case 'h':
            format += Tcl_UtfToUniChar(format, &ch);
        }

        /*
         * Handle the various field types.
         */

        switch (ch) {
        case 'n':
            if (!(flags & SCAN_SUPPRESS)) {
                objPtr = Tcl_NewIntObj(string - baseString);
                Tcl_IncrRefCount(objPtr);
                objs[objIndex++] = objPtr;
            }
            nconversions++;
            continue;

        case 'd':
            op = 'i';
            parseFlag |= TCL_PARSE_DECIMAL_ONLY;
            break;
        case 'i':
            op = 'i';
            parseFlag |= TCL_PARSE_SCAN_PREFIXES;
            break;
        case 'o':
            op = 'i';
            parseFlag |= TCL_PARSE_OCTAL_ONLY | TCL_PARSE_SCAN_PREFIXES;
            break;
        case 'x':
            op = 'i';
            parseFlag |= TCL_PARSE_HEXADECIMAL_ONLY;
            break;
        case 'u':
            op = 'i';
            parseFlag |= TCL_PARSE_DECIMAL_ONLY;
            flags |= SCAN_UNSIGNED;
            break;

        case 'f':
        case 'e':
        case 'g':
            op = 'f';
            break;

        case 's':
            op = 's';
            break;

        case 'c':
            op = 'c';
            flags |= SCAN_NOSKIP;
            break;
        case '[':
            op = '[';
            flags |= SCAN_NOSKIP;
            break;
        }

        /*
         * At this point, we will need additional characters from the string
         * to proceed.
         */

        if (*string == '\0') {
            underflow = 1;
            goto done;
        }

        /*
         * Skip any leading whitespace at the beginning of a field unless the
         * format suppresses this behavior.
         */

        if (!(flags & SCAN_NOSKIP)) {
            while (*string != '\0') {
                offset = Tcl_UtfToUniChar(string, &sch);
                if (!Tcl_UniCharIsSpace(sch)) {
                    break;
                }
                string += offset;
            }
            if (*string == '\0') {
                underflow = 1;
                goto done;
            }
        }

        /*
         * Perform the requested scanning operation.
         */

        switch (op) {
        case 's':
            /*
             * Scan a string up to width characters or whitespace.
             */

            if (width == 0) {
                width = ~0;
            }
            end = string;
            while (*end != '\0') {
                offset = Tcl_UtfToUniChar(end, &sch);
                if (Tcl_UniCharIsSpace(sch)) {
                    break;
                }
                end += offset;
                if (--width == 0) {
                    break;
                }
            }
            if (!(flags & SCAN_SUPPRESS)) {
                objPtr = Tcl_NewStringObj(string, end-string);
                Tcl_IncrRefCount(objPtr);
                objs[objIndex++] = objPtr;
            }
            string = end;
            break;

        case '[': {
            CharSet cset;

            if (width == 0) {
                width = ~0;
            }
            end = string;

            format = BuildCharSet(&cset, format);
            while (*end != '\0') {
                offset = Tcl_UtfToUniChar(end, &sch);
                if (!CharInSet(&cset, (int)sch)) {
                    break;
                }
                end += offset;
                if (--width == 0) {
                    break;
                }
            }
            ReleaseCharSet(&cset);

            if (string == end) {
                /*
                 * Nothing matched the range, stop processing.
                 */
                goto done;
            }
            if (!(flags & SCAN_SUPPRESS)) {
                objPtr = Tcl_NewStringObj(string, end-string);
                Tcl_IncrRefCount(objPtr);
                objs[objIndex++] = objPtr;
            }
            string = end;

            break;
        }
        case 'c':
            /*
             * Scan a single Unicode character.
             */

            string += Tcl_UtfToUniChar(string, &sch);
            if (!(flags & SCAN_SUPPRESS)) {
                objPtr = Tcl_NewIntObj((int)sch);
                Tcl_IncrRefCount(objPtr);
                objs[objIndex++] = objPtr;
            }
            break;

        case 'i':
            /*
             * Scan an unsigned or signed integer.
             */
            objPtr = Tcl_NewLongObj(0);
            Tcl_IncrRefCount(objPtr);
            if (width == 0) {
                width = ~0;
            }
            if (TCL_OK != TclParseNumber(NULL, objPtr, NULL, string, width,
                    &end, TCL_PARSE_INTEGER_ONLY | parseFlag)) {
                Tcl_DecrRefCount(objPtr);
                if (width < 0) {
                    if (*end == '\0') {
                        underflow = 1;
                    }
                } else {
                    if (end == string + width) {
                        underflow = 1;
                    }
                }
                goto done;
            }
            string = end;
            if (flags & SCAN_SUPPRESS) {
                Tcl_DecrRefCount(objPtr);
                break;
            }
            if (flags & SCAN_LONGER) {
                if (Tcl_GetWideIntFromObj(NULL, objPtr, &wideValue) != TCL_OK) {
                    wideValue = ~(Tcl_WideUInt)0 >> 1;  /* WIDE_MAX */
                    if (TclGetString(objPtr)[0] == '-') {
                        wideValue++;    /* WIDE_MAX + 1 = WIDE_MIN */
                    }
                }
                if ((flags & SCAN_UNSIGNED) && (wideValue < 0)) {
                    sprintf(buf, "%" TCL_LL_MODIFIER "u",
                            (Tcl_WideUInt)wideValue);
                    Tcl_SetStringObj(objPtr, buf, -1);
                } else {
                    Tcl_SetWideIntObj(objPtr, wideValue);
                }
            } else if (!(flags & SCAN_BIG)) {
                if (TclGetLongFromObj(NULL, objPtr, &value) != TCL_OK) {
                    if (TclGetString(objPtr)[0] == '-') {
                        value = LONG_MIN;
                    } else {
                        value = LONG_MAX;
                    }
                }
                if ((flags & SCAN_UNSIGNED) && (value < 0)) {
                    sprintf(buf, "%lu", value); /* INTL: ISO digit */
                    Tcl_SetStringObj(objPtr, buf, -1);
                } else {
                    Tcl_SetLongObj(objPtr, value);
                }
            }
            objs[objIndex++] = objPtr;
            break;

        case 'f':
            /*
             * Scan a floating point number
             */

            objPtr = Tcl_NewDoubleObj(0.0);
            Tcl_IncrRefCount(objPtr);
            if (width == 0) {
                width = ~0;
            }
            if (TCL_OK != TclParseNumber(NULL, objPtr, NULL, string, width,
                    &end, TCL_PARSE_DECIMAL_ONLY | TCL_PARSE_NO_WHITESPACE)) {
                Tcl_DecrRefCount(objPtr);
                if (width < 0) {
                    if (*end == '\0') {
                        underflow = 1;
                    }
                } else {
                    if (end == string + width) {
                        underflow = 1;
                    }
                }
                goto done;
            } else if (flags & SCAN_SUPPRESS) {
                Tcl_DecrRefCount(objPtr);
                string = end;
            } else {
                double dvalue;
                if (Tcl_GetDoubleFromObj(NULL, objPtr, &dvalue) != TCL_OK) {
#ifdef ACCEPT_NAN
                    if (objPtr->typePtr == &tclDoubleType) {
                        dValue = objPtr->internalRep.doubleValue;
                    } else
#endif
                    {
                        Tcl_DecrRefCount(objPtr);
                        goto done;
                    }
                }
                Tcl_SetDoubleObj(objPtr, dvalue);
                objs[objIndex++] = objPtr;
                string = end;
            }
        }
        nconversions++;
    }

  done:
    result = 0;
    code = TCL_OK;

    if (numVars) {
        /*
         * In this case, variables were specified (classic scan).
         */

        for (i = 0; i < totalVars; i++) {
            if (objs[i] == NULL) {
                continue;
            }
            result++;
            if (Tcl_ObjSetVar2(interp, objv[i+3], NULL, objs[i], 0) == NULL) {
                Tcl_AppendResult(interp, "couldn't set variable \"",
                        TclGetString(objv[i+3]), "\"", NULL);
                code = TCL_ERROR;
            }
            Tcl_DecrRefCount(objs[i]);
        }
    } else {
        /*
         * Here no vars were specified, we want a list returned (inline scan)
         */

        objPtr = Tcl_NewObj();
        for (i = 0; i < totalVars; i++) {
            if (objs[i] != NULL) {
                Tcl_ListObjAppendElement(NULL, objPtr, objs[i]);
                Tcl_DecrRefCount(objs[i]);
            } else {
                /*
                 * More %-specifiers than matching chars, so we just spit out
                 * empty strings for these.
                 */

                Tcl_ListObjAppendElement(NULL, objPtr, Tcl_NewObj());
            }
        }
    }
    if (objs != NULL) {
        ckfree((char*) objs);
    }
    if (code == TCL_OK) {
        if (underflow && (nconversions == 0)) {
            if (numVars) {
                objPtr = Tcl_NewIntObj(-1);
            } else {
                if (objPtr) {
                    Tcl_SetListObj(objPtr, 0, NULL);
                } else {
                    objPtr = Tcl_NewObj();
                }
            }
        } else if (numVars) {
            objPtr = Tcl_NewIntObj(result);
        }
        Tcl_SetObjResult(interp, objPtr);
    }
    return code;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */