path: root/ext/Data/Dumper/Dumper.xs

#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#ifndef PERL_VERSION
#    include <patchlevel.h>
#    if !(defined(PERL_VERSION) || (SUBVERSION > 0 && defined(PATCHLEVEL)))
#        include <could_not_find_Perl_patchlevel.h>
#    endif
#    define PERL_VERSION PATCHLEVEL
#endif

#if PERL_VERSION < 5
#  ifndef PL_sv_undef
#    define PL_sv_undef	sv_undef
#  endif
#  ifndef ERRSV
#    define ERRSV	GvSV(errgv)
#  endif
#  ifndef newSVpvn
#    define newSVpvn	newSVpv
#  endif
#endif

static I32 num_q (char *s, STRLEN slen);
static I32 esc_q (char *dest, char *src, STRLEN slen);
static I32 esc_q_utf8 (pTHX_ SV *sv, char *src, STRLEN slen);
static SV *sv_x (pTHX_ SV *sv, char *str, STRLEN len, I32 n);
static I32 DD_dump (pTHX_ SV *val, char *name, STRLEN namelen, SV *retval,
		    HV *seenhv, AV *postav, I32 *levelp, I32 indent,
		    SV *pad, SV *xpad, SV *apad, SV *sep, SV *pair,
		    SV *freezer, SV *toaster,
		    I32 purity, I32 deepcopy, I32 quotekeys, SV *bless,
		    I32 maxdepth, SV *sortkeys);

/* does a string need to be protected? */
static I32
needs_quote(register char *s)
{
TOP:
    if (s[0] == ':') {
	if (*++s) {
	    if (*s++ != ':')
		return 1;
	}
	else
	    return 1;
    }
    if (isIDFIRST(*s)) {
	while (*++s)
	    if (!isALNUM(*s)) {
		if (*s == ':')
		    goto TOP;
		else
		    return 1;
	    }
    }
    else
	return 1;
    return 0;
}

/* count the number of "'"s and "\"s in string */
static I32
num_q(register char *s, register STRLEN slen)
{
    register I32 ret = 0;

    while (slen > 0) {
	if (*s == '\'' || *s == '\\')
	    ++ret;
	++s;
	--slen;
    }
    return ret;
}


/* returns number of chars added to escape "'"s and "\"s in s */
/* slen number of characters in s will be escaped */
/* destination must be long enough for additional chars */
static I32
esc_q(register char *d, register char *s, register STRLEN slen)
{
    register I32 ret = 0;

    while (slen > 0) {
	switch (*s) {
	case '\'':
	case '\\':
	    *d = '\\';
	    ++d; ++ret;
	default:
	    *d = *s;
	    ++d; ++s; --slen;
	    break;
	}
    }
    return ret;
}

static I32
esc_q_utf8(pTHX_ SV* sv, register char *src, register STRLEN slen)
{
    char *s, *send, *r, *rstart;
    STRLEN j, cur = SvCUR(sv);
    /* Could count 128-255 and 256+ in two variables, if we want to
       be like &qquote and make a distinction.  */
    STRLEN grow = 0;	/* bytes needed to represent chars 128+ */
    /* STRLEN topbit_grow = 0;	bytes needed to represent chars 128-255 */
    STRLEN backslashes = 0;
    STRLEN single_quotes = 0;
    STRLEN qq_escapables = 0;	/* " $ @ will need a \ in "" strings.  */
    STRLEN normal = 0;

    /* this will need EBCDICification */
    for (s = src, send = src + slen; s < send; s += UTF8SKIP(s)) {
        UV k = utf8_to_uvchr((U8*)s, NULL);

        if (k > 127) {
            /* 4: \x{} then count the number of hex digits.  */
            grow += 4 + (k <= 0xFF ? 2 : k <= 0xFFF ? 3 : k <= 0xFFFF ? 4 :
#if UVSIZE == 4
                8 /* We may allocate a bit more than the minimum here.  */
#else
                k <= 0xFFFFFFFF ? 8 : UVSIZE * 4
#endif
                );
        } else if (k == '\\') {
            backslashes++;
        } else if (k == '\'') {
            single_quotes++;
        } else if (k == '"' || k == '$' || k == '@') {
            qq_escapables++;
        } else {
            normal++;
        }
    }
    if (grow) {
        /* We have something needing hex. 3 is ""\0 */
        sv_grow(sv, cur + 3 + grow + 2*backslashes + single_quotes
		+ 2*qq_escapables + normal);
        rstart = r = SvPVX(sv) + cur;

        *r++ = '"';

        for (s = src; s < send; s += UTF8SKIP(s)) {
            UV k = utf8_to_uvchr((U8*)s, NULL);

            if (k == '"' || k == '\\' || k == '$' || k == '@') {
                *r++ = '\\';
                *r++ = (char)k;
            }
            else if (k < 0x80)
                *r++ = (char)k;
            else {
	      /* The return value of sprintf() is unportable.
	       * In modern systems it returns (int) the number of characters,
	       * but in older systems it might return (char*) the original
	       * buffer, or it might even be (void).  The easiest portable
	       * thing to do is probably use sprintf() in void context and
	       * then strlen(buffer) for the length.  The more proper way
	       * would of course be to figure out the prototype of sprintf.
	       * --jhi */
	        sprintf(r, "\\x{%"UVxf"}", k);
                r += strlen(r);
            }
        }
        *r++ = '"';
    } else {
        /* Single quotes.  */
        sv_grow(sv, cur + 3 + 2*backslashes + 2*single_quotes
		+ qq_escapables + normal);
        rstart = r = SvPVX(sv) + cur;
        *r++ = '\'';
        for (s = src; s < send; s ++) {
            char k = *s;
            if (k == '\'' || k == '\\')
                *r++ = '\\';
            *r++ = k;
        }
        *r++ = '\'';
    }
    *r = '\0';
    j = r - rstart;
    SvCUR_set(sv, cur + j);

    return j;
}

/* append a repeated string to an SV */
static SV *
sv_x(pTHX_ SV *sv, register char *str, STRLEN len, I32 n)
{
    if (sv == Nullsv)
	sv = newSVpvn("", 0);
    else
	assert(SvTYPE(sv) >= SVt_PV);

    if (n > 0) {
	SvGROW(sv, len*n + SvCUR(sv) + 1);
	if (len == 1) {
	    char *start = SvPVX(sv) + SvCUR(sv);
	    SvCUR(sv) += n;
	    start[n] = '\0';
	    while (n > 0)
		start[--n] = str[0];
	}
	else
	    while (n > 0) {
		sv_catpvn(sv, str, len);
		--n;
	    }
    }
    return sv;
}

/*
 * This ought to be split into smaller functions. (it is one long function since
 * it exactly parallels the perl version, which was one long thing for
 * efficiency raisins.)  Ugggh!
 */
static I32
DD_dump(pTHX_ SV *val, char *name, STRLEN namelen, SV *retval, HV *seenhv,
	AV *postav, I32 *levelp, I32 indent, SV *pad, SV *xpad,
	SV *apad, SV *sep, SV *pair, SV *freezer, SV *toaster, I32 purity,
	I32 deepcopy, I32 quotekeys, SV *bless, I32 maxdepth, SV *sortkeys)
{
    char tmpbuf[128];
    U32 i;
    char *c, *r, *realpack, id[128];
    SV **svp;
    SV *sv, *ipad, *ival;
    SV *blesspad = Nullsv;
    AV *seenentry = Nullav;
    char *iname;
    STRLEN inamelen, idlen = 0;
    U32 realtype;

    if (!val)
	return 0;

    realtype = SvTYPE(val);

    if (SvGMAGICAL(val))
        mg_get(val);
    if (SvROK(val)) {

	if (SvOBJECT(SvRV(val)) && freezer &&
	    SvPOK(freezer) && SvCUR(freezer))
	{
	    dSP; ENTER; SAVETMPS; PUSHMARK(sp);
	    XPUSHs(val); PUTBACK;
	    i = perl_call_method(SvPVX(freezer), G_EVAL|G_SCALAR);
	    SPAGAIN;
	    if (SvTRUE(ERRSV))
		warn("WARNING(Freezer method call failed): %"SVf"", ERRSV);
	    else if (i)
		val = newSVsv(POPs);
	    PUTBACK; FREETMPS; LEAVE;
	    if (i)
		(void)sv_2mortal(val);
	}
	
	ival = SvRV(val);
	realtype = SvTYPE(ival);
        (void) sprintf(id, "0x%"UVxf, PTR2UV(ival));
	idlen = strlen(id);
	if (SvOBJECT(ival))
	    realpack = HvNAME(SvSTASH(ival));
	else
	    realpack = Nullch;

	/* if it has a name, we need to either look it up, or keep a tab
	 * on it so we know when we hit it later
	 */
	if (namelen) {
	    if ((svp = hv_fetch(seenhv, id, idlen, FALSE))
		&& (sv = *svp) && SvROK(sv) && (seenentry = (AV*)SvRV(sv)))
	    {
		SV *othername;
		if ((svp = av_fetch(seenentry, 0, FALSE))
		    && (othername = *svp))
		{
		    if (purity && *levelp > 0) {
			SV *postentry;
			
			if (realtype == SVt_PVHV)
			    sv_catpvn(retval, "{}", 2);
			else if (realtype == SVt_PVAV)
			    sv_catpvn(retval, "[]", 2);
			else
			    sv_catpvn(retval, "do{my $o}", 9);
			postentry = newSVpvn(name, namelen);
			sv_catpvn(postentry, " = ", 3);
			sv_catsv(postentry, othername);
			av_push(postav, postentry);
		    }
		    else {
			if (name[0] == '@' || name[0] == '%') {
			    if ((SvPVX(othername))[0] == '\\' &&
				(SvPVX(othername))[1] == name[0]) {
				sv_catpvn(retval, SvPVX(othername)+1,
					  SvCUR(othername)-1);
			    }
			    else {
				sv_catpvn(retval, name, 1);
				sv_catpvn(retval, "{", 1);
				sv_catsv(retval, othername);
				sv_catpvn(retval, "}", 1);
			    }
			}
			else
			    sv_catsv(retval, othername);
		    }
		    return 1;
		}
		else {
		    warn("ref name not found for %s", id);
		    return 0;
		}
	    }
	    else {   /* store our name and continue */
		SV *namesv;
		if (name[0] == '@' || name[0] == '%') {
		    namesv = newSVpvn("\\", 1);
		    sv_catpvn(namesv, name, namelen);
		}
		else if (realtype == SVt_PVCV && name[0] == '*') {
		    namesv = newSVpvn("\\", 2);
		    sv_catpvn(namesv, name, namelen);
		    (SvPVX(namesv))[1] = '&';
		}
		else
		    namesv = newSVpvn(name, namelen);
		seenentry = newAV();
		av_push(seenentry, namesv);
		(void)SvREFCNT_inc(val);
		av_push(seenentry, val);
		(void)hv_store(seenhv, id, strlen(id),
			       newRV((SV*)seenentry), 0);
		SvREFCNT_dec(seenentry);
	    }
	}

	if (realpack && *realpack == 'R' && strEQ(realpack, "Regexp")) {
	    STRLEN rlen;
	    char *rval = SvPV(val, rlen);
	    char *slash = strchr(rval, '/');
	    sv_catpvn(retval, "qr/", 3);
	    while (slash) {
		sv_catpvn(retval, rval, slash-rval);
		sv_catpvn(retval, "\\/", 2);
		rlen -= slash-rval+1;
		rval = slash+1;
		slash = strchr(rval, '/');
	    }
	    sv_catpvn(retval, rval, rlen);
	    sv_catpvn(retval, "/", 1);
	    return 1;
	}

	/* If purity is not set and maxdepth is set, then check depth:
	 * if we have reached maximum depth, return the string
	 * representation of the thing we are currently examining
	 * at this depth (i.e., 'Foo=ARRAY(0xdeadbeef)').
	 */
	if (!purity && maxdepth > 0 && *levelp >= maxdepth) {
	    STRLEN vallen;
	    char *valstr = SvPV(val,vallen);
	    sv_catpvn(retval, "'", 1);
	    sv_catpvn(retval, valstr, vallen);
	    sv_catpvn(retval, "'", 1);
	    return 1;
	}

	if (realpack) {				/* we have a blessed ref */
	    STRLEN blesslen;
	    char *blessstr = SvPV(bless, blesslen);
	    sv_catpvn(retval, blessstr, blesslen);
	    sv_catpvn(retval, "( ", 2);
	    if (indent >= 2) {
		blesspad = apad;
		apad = newSVsv(apad);
		sv_x(aTHX_ apad, " ", 1, blesslen+2);
	    }
	}

	(*levelp)++;
	ipad = sv_x(aTHX_ Nullsv, SvPVX(xpad), SvCUR(xpad), *levelp);

	if (realtype <= SVt_PVBM) {			     /* scalar ref */
	    SV *namesv = newSVpvn("${", 2);
	    sv_catpvn(namesv, name, namelen);
	    sv_catpvn(namesv, "}", 1);
	    if (realpack) {				     /* blessed */
		sv_catpvn(retval, "do{\\(my $o = ", 13);
		DD_dump(aTHX_ ival, SvPVX(namesv), SvCUR(namesv), retval, seenhv,
			postav, levelp,	indent, pad, xpad, apad, sep, pair,
			freezer, toaster, purity, deepcopy, quotekeys, bless,
			maxdepth, sortkeys);
		sv_catpvn(retval, ")}", 2);
	    }						     /* plain */
	    else {
		sv_catpvn(retval, "\\", 1);
		DD_dump(aTHX_ ival, SvPVX(namesv), SvCUR(namesv), retval, seenhv,
			postav, levelp,	indent, pad, xpad, apad, sep, pair,
			freezer, toaster, purity, deepcopy, quotekeys, bless,
			maxdepth, sortkeys);
	    }
	    SvREFCNT_dec(namesv);
	}
	else if (realtype == SVt_PVGV) {		     /* glob ref */
	    SV *namesv = newSVpvn("*{", 2);
	    sv_catpvn(namesv, name, namelen);
	    sv_catpvn(namesv, "}", 1);
	    sv_catpvn(retval, "\\", 1);
	    DD_dump(aTHX_ ival, SvPVX(namesv), SvCUR(namesv), retval, seenhv,
		    postav, levelp,	indent, pad, xpad, apad, sep, pair,
		    freezer, toaster, purity, deepcopy, quotekeys, bless,
		    maxdepth, sortkeys);
	    SvREFCNT_dec(namesv);
	}
	else if (realtype == SVt_PVAV) {
	    SV *totpad;
	    I32 ix = 0;
	    I32 ixmax = av_len((AV *)ival);
	
	    SV *ixsv = newSViv(0);
	    /* allowing for a 24 char wide array index */
	    New(0, iname, namelen+28, char);
	    (void)strcpy(iname, name);
	    inamelen = namelen;
	    if (name[0] == '@') {
		sv_catpvn(retval, "(", 1);
		iname[0] = '$';
	    }
	    else {
		sv_catpvn(retval, "[", 1);
		/* omit "->" in $foo{bar}->[0], but not in ${$foo}->[0] */
		/*if (namelen > 0
		    && name[namelen-1] != ']' && name[namelen-1] != '}'
		    && (namelen < 4 || (name[1] != '{' && name[2] != '{')))*/
		if ((namelen > 0
		     && name[namelen-1] != ']' && name[namelen-1] != '}')
		    || (namelen > 4
		        && (name[1] == '{'
			    || (name[0] == '\\' && name[2] == '{'))))
		{
		    iname[inamelen++] = '-'; iname[inamelen++] = '>';
		    iname[inamelen] = '\0';
		}
	    }
	    if (iname[0] == '*' && iname[inamelen-1] == '}' && inamelen >= 8 &&
		(instr(iname+inamelen-8, "{SCALAR}") ||
		 instr(iname+inamelen-7, "{ARRAY}") ||
		 instr(iname+inamelen-6, "{HASH}"))) {
		iname[inamelen++] = '-'; iname[inamelen++] = '>';
	    }
	    iname[inamelen++] = '['; iname[inamelen] = '\0';
	    totpad = newSVsv(sep);
	    sv_catsv(totpad, pad);
	    sv_catsv(totpad, apad);

	    for (ix = 0; ix <= ixmax; ++ix) {
		STRLEN ilen;
		SV *elem;
		svp = av_fetch((AV*)ival, ix, FALSE);
		if (svp)
		    elem = *svp;
		else
		    elem = &PL_sv_undef;
		
		ilen = inamelen;
		sv_setiv(ixsv, ix);
                (void) sprintf(iname+ilen, "%"IVdf, (IV)ix);
		ilen = strlen(iname);
		iname[ilen++] = ']'; iname[ilen] = '\0';
		if (indent >= 3) {
		    sv_catsv(retval, totpad);
		    sv_catsv(retval, ipad);
		    sv_catpvn(retval, "#", 1);
		    sv_catsv(retval, ixsv);
		}
		sv_catsv(retval, totpad);
		sv_catsv(retval, ipad);
		DD_dump(aTHX_ elem, iname, ilen, retval, seenhv, postav,
			levelp,	indent, pad, xpad, apad, sep, pair,
			freezer, toaster, purity, deepcopy, quotekeys, bless,
			maxdepth, sortkeys);
		if (ix < ixmax)
		    sv_catpvn(retval, ",", 1);
	    }
	    if (ixmax >= 0) {
		SV *opad = sv_x(aTHX_ Nullsv, SvPVX(xpad), SvCUR(xpad), (*levelp)-1);
		sv_catsv(retval, totpad);
		sv_catsv(retval, opad);
		SvREFCNT_dec(opad);
	    }
	    if (name[0] == '@')
		sv_catpvn(retval, ")", 1);
	    else
		sv_catpvn(retval, "]", 1);
	    SvREFCNT_dec(ixsv);
	    SvREFCNT_dec(totpad);
	    Safefree(iname);
	}
	else if (realtype == SVt_PVHV) {
	    SV *totpad, *newapad;
	    SV *iname, *sname;
	    HE *entry;
	    char *key;
	    I32 klen;
	    SV *hval;
	    AV *keys = Nullav;
	
	    iname = newSVpvn(name, namelen);
	    if (name[0] == '%') {
		sv_catpvn(retval, "(", 1);
		(SvPVX(iname))[0] = '$';
	    }
	    else {
		sv_catpvn(retval, "{", 1);
		/* omit "->" in $foo[0]->{bar}, but not in ${$foo}->{bar} */
		if ((namelen > 0
		     && name[namelen-1] != ']' && name[namelen-1] != '}')
		    || (namelen > 4
		        && (name[1] == '{'
			    || (name[0] == '\\' && name[2] == '{'))))
		{
		    sv_catpvn(iname, "->", 2);
		}
	    }
	    if (name[0] == '*' && name[namelen-1] == '}' && namelen >= 8 &&
		(instr(name+namelen-8, "{SCALAR}") ||
		 instr(name+namelen-7, "{ARRAY}") ||
		 instr(name+namelen-6, "{HASH}"))) {
		sv_catpvn(iname, "->", 2);
	    }
	    sv_catpvn(iname, "{", 1);
	    totpad = newSVsv(sep);
	    sv_catsv(totpad, pad);
	    sv_catsv(totpad, apad);
	
	    /* If requested, get a sorted/filtered array of hash keys */
	    if (sortkeys) {
		if (sortkeys == &PL_sv_yes) {
		    keys = newAV();
		    (void)hv_iterinit((HV*)ival);
		    while ((entry = hv_iternext((HV*)ival))) {
			sv = hv_iterkeysv(entry);
			SvREFCNT_inc(sv);
			av_push(keys, sv);
		    }
#ifdef USE_LOCALE_NUMERIC
		    sortsv(AvARRAY(keys), 
			   av_len(keys)+1, 
			   IN_LOCALE ? Perl_sv_cmp_locale : Perl_sv_cmp);
#else
		    sortsv(AvARRAY(keys), 
			   av_len(keys)+1, 
			   Perl_sv_cmp);
#endif
		}
		else {
		    dSP; ENTER; SAVETMPS; PUSHMARK(sp);
		    XPUSHs(sv_2mortal(newRV_inc(ival))); PUTBACK;
		    i = perl_call_sv(sortkeys, G_SCALAR | G_EVAL);
		    SPAGAIN;
		    if (i) {
			sv = POPs;
			if (SvROK(sv) && (SvTYPE(SvRV(sv)) == SVt_PVAV))
			    keys = (AV*)SvREFCNT_inc(SvRV(sv));
		    }
		    if (! keys)
			warn("Sortkeys subroutine did not return ARRAYREF\n");
		    PUTBACK; FREETMPS; LEAVE;
		}
		if (keys)
		    sv_2mortal((SV*)keys);
	    }
	    else
		(void)hv_iterinit((HV*)ival);

            /* foreach (keys %hash) */
            for (i = 0; 1; i++) {
		char *nkey;
                char *nkey_buffer = NULL;
		I32 nticks = 0;
		SV* keysv;
		STRLEN keylen;
                I32 nlen;
		bool do_utf8 = FALSE;

                if ((sortkeys && !(keys && (I32)i <= av_len(keys))) ||
                    !(entry = hv_iternext((HV *)ival)))
                    break;

		if (i)
		    sv_catpvn(retval, ",", 1);

		if (sortkeys) {
		    char *key;
		    svp = av_fetch(keys, i, FALSE);
		    keysv = svp ? *svp : sv_mortalcopy(&PL_sv_undef);
		    key = SvPV(keysv, keylen);
		    svp = hv_fetch((HV*)ival, key,
                                   SvUTF8(keysv) ? -(I32)keylen : keylen, 0);
		    hval = svp ? *svp : sv_mortalcopy(&PL_sv_undef);
		}
		else {
		    keysv = hv_iterkeysv(entry);
		    hval = hv_iterval((HV*)ival, entry);
		}

		do_utf8 = DO_UTF8(keysv);
		key = SvPV(keysv, keylen);
		klen = keylen;

                sv_catsv(retval, totpad);
                sv_catsv(retval, ipad);
                /* old logic was first to check utf8 flag, and if utf8 always
                   call esc_q_utf8.  This caused test to break under -Mutf8,
                   because there even strings like 'c' have utf8 flag on.
                   Hence with quotekeys == 0 the XS code would still '' quote
                   them based on flags, whereas the perl code would not,
                   based on regexps.
                   The perl code is correct.
                   needs_quote() decides that anything that isn't a valid
                   perl identifier needs to be quoted, hence only correctly
                   formed strings with no characters outside [A-Za-z0-9_:]
                   won't need quoting.  None of those characters are used in
                   the byte encoding of utf8, so anything with utf8
                   encoded characters in will need quoting. Hence strings
                   with utf8 encoded characters in will end up inside do_utf8
                   just like before, but now strings with utf8 flag set but
                   only ascii characters will end up in the unquoted section.

                   There should also be less tests for the (probably currently)
                   more common doesn't need quoting case.
                   The code is also smaller (22044 vs 22260) because I've been
                   able to pull the common logic out to both sides.  */
                if (quotekeys || needs_quote(key)) {
                    if (do_utf8) {
                        STRLEN ocur = SvCUR(retval);
                        nlen = esc_q_utf8(aTHX_ retval, key, klen);
                        nkey = SvPVX(retval) + ocur;
                    }
                    else {
		        nticks = num_q(key, klen);
			New(0, nkey_buffer, klen+nticks+3, char);
                        nkey = nkey_buffer;
			nkey[0] = '\'';
			if (nticks)
			    klen += esc_q(nkey+1, key, klen);
			else
			    (void)Copy(key, nkey+1, klen, char);
			nkey[++klen] = '\'';
			nkey[++klen] = '\0';
                        nlen = klen;
                        sv_catpvn(retval, nkey, klen);
		    }
                }
                else {
                    nkey = key;
                    nlen = klen;
                    sv_catpvn(retval, nkey, klen);
		}
                sname = newSVsv(iname);
                sv_catpvn(sname, nkey, nlen);
                sv_catpvn(sname, "}", 1);

		sv_catsv(retval, pair);
		if (indent >= 2) {
		    char *extra;
		    I32 elen = 0;
		    newapad = newSVsv(apad);
		    New(0, extra, klen+4+1, char);
		    while (elen < (klen+4))
			extra[elen++] = ' ';
		    extra[elen] = '\0';
		    sv_catpvn(newapad, extra, elen);
		    Safefree(extra);
		}
		else
		    newapad = apad;

		DD_dump(aTHX_ hval, SvPVX(sname), SvCUR(sname), retval, seenhv,
			postav, levelp,	indent, pad, xpad, newapad, sep, pair,
			freezer, toaster, purity, deepcopy, quotekeys, bless,
			maxdepth, sortkeys);
		SvREFCNT_dec(sname);
		Safefree(nkey_buffer);
		if (indent >= 2)
		    SvREFCNT_dec(newapad);
	    }
	    if (i) {
		SV *opad = sv_x(aTHX_ Nullsv, SvPVX(xpad), SvCUR(xpad), *levelp-1);
		sv_catsv(retval, totpad);
		sv_catsv(retval, opad);
		SvREFCNT_dec(opad);
	    }
	    if (name[0] == '%')
		sv_catpvn(retval, ")", 1);
	    else
		sv_catpvn(retval, "}", 1);
	    SvREFCNT_dec(iname);
	    SvREFCNT_dec(totpad);
	}
	else if (realtype == SVt_PVCV) {
	    sv_catpvn(retval, "sub { \"DUMMY\" }", 15);
	    if (purity)
		warn("Encountered CODE ref, using dummy placeholder");
	}
	else {
	    warn("cannot handle ref type %ld", realtype);
	}

	if (realpack) {  /* free blessed allocs */
	    if (indent >= 2) {
		SvREFCNT_dec(apad);
		apad = blesspad;
	    }
	    sv_catpvn(retval, ", '", 3);
	    sv_catpvn(retval, realpack, strlen(realpack));
	    sv_catpvn(retval, "' )", 3);
	    if (toaster && SvPOK(toaster) && SvCUR(toaster)) {
		sv_catpvn(retval, "->", 2);
		sv_catsv(retval, toaster);
		sv_catpvn(retval, "()", 2);
	    }
	}
	SvREFCNT_dec(ipad);
	(*levelp)--;
    }
    else {
	STRLEN i;
	
	if (namelen) {
	    (void) sprintf(id, "0x%"UVxf, PTR2UV(val));
	    if ((svp = hv_fetch(seenhv, id, (idlen = strlen(id)), FALSE)) &&
		(sv = *svp) && SvROK(sv) &&
		(seenentry = (AV*)SvRV(sv)))
	    {
		SV *othername;
		if ((svp = av_fetch(seenentry, 0, FALSE)) && (othername = *svp)
		    && (svp = av_fetch(seenentry, 2, FALSE)) && *svp && SvIV(*svp) > 0)
		{
		    sv_catpvn(retval, "${", 2);
		    sv_catsv(retval, othername);
		    sv_catpvn(retval, "}", 1);
		    return 1;
		}
	    }
	    else if (val != &PL_sv_undef) {
		SV *namesv;
		namesv = newSVpvn("\\", 1);
		sv_catpvn(namesv, name, namelen);
		seenentry = newAV();
		av_push(seenentry, namesv);
		av_push(seenentry, newRV(val));
		(void)hv_store(seenhv, id, strlen(id), newRV((SV*)seenentry), 0);
		SvREFCNT_dec(seenentry);
	    }
	}

	if (SvIOK(val)) {
            STRLEN len;
	    if (SvIsUV(val))
	      (void) sprintf(tmpbuf, "%"UVuf, SvUV(val));
	    else
	      (void) sprintf(tmpbuf, "%"IVdf, SvIV(val));
            len = strlen(tmpbuf);
            /* For 5.6.x and earlier will need to change this test to check
               NV if NOK, as there NOK trumps IOK, and NV=3.5,IV=3 is valid.
               Current code will Dump that as $VAR1 = 3;
               Changes in 5.7 series mean that now IOK is only set if scalar
               is precisely integer.  */
            if (SvPOK(val)) {
              /* Need to check to see if this is a string such as " 0".
                 I'm assuming from sprintf isn't going to clash with utf8.
                 Is this valid on EBCDIC?  */
              STRLEN pvlen;
              const char *pv = SvPV(val, pvlen);
              if (pvlen != len || memNE(pv, tmpbuf, len))
                goto integer_came_from_string;
            }
            if (len > 10) {
              /* Looks like we're on a 64 bit system.  Make it a string so that
                 if a 32 bit system reads the number it will cope better.  */
              sv_catpvf(retval, "'%s'", tmpbuf);
            } else
              sv_catpvn(retval, tmpbuf, len);
	}
	else if (realtype == SVt_PVGV) {/* GLOBs can end up with scribbly names */
	    c = SvPV(val, i);
	    ++c; --i;			/* just get the name */
	    if (i >= 6 && strncmp(c, "main::", 6) == 0) {
		c += 4;
		i -= 4;
	    }
	    if (needs_quote(c)) {
		sv_grow(retval, SvCUR(retval)+6+2*i);
		r = SvPVX(retval)+SvCUR(retval);
		r[0] = '*'; r[1] = '{';	r[2] = '\'';
		i += esc_q(r+3, c, i);
		i += 3;
		r[i++] = '\''; r[i++] = '}';
		r[i] = '\0';
	    }
	    else {
		sv_grow(retval, SvCUR(retval)+i+2);
		r = SvPVX(retval)+SvCUR(retval);
		r[0] = '*'; strcpy(r+1, c);
		i++;
	    }
	    SvCUR_set(retval, SvCUR(retval)+i);

	    if (purity) {
		static char *entries[] = { "{SCALAR}", "{ARRAY}", "{HASH}" };
		static STRLEN sizes[] = { 8, 7, 6 };
		SV *e;
		SV *nname = newSVpvn("", 0);
		SV *newapad = newSVpvn("", 0);
		GV *gv = (GV*)val;
		I32 j;
		
		for (j=0; j<3; j++) {
		    e = ((j == 0) ? GvSV(gv) : (j == 1) ? (SV*)GvAV(gv) : (SV*)GvHV(gv));
		    if (!e)
			continue;
		    if (j == 0 && !SvOK(e))
			continue;

		    {
			I32 nlevel = 0;
			SV *postentry = newSVpvn(r,i);
			
			sv_setsv(nname, postentry);
			sv_catpvn(nname, entries[j], sizes[j]);
			sv_catpvn(postentry, " = ", 3);
			av_push(postav, postentry);
			e = newRV(e);
			
			SvCUR(newapad) = 0;
			if (indent >= 2)
			    (void)sv_x(aTHX_ newapad, " ", 1, SvCUR(postentry));
			
			DD_dump(aTHX_ e, SvPVX(nname), SvCUR(nname), postentry,
				seenhv, postav, &nlevel, indent, pad, xpad,
				newapad, sep, pair, freezer, toaster, purity,
				deepcopy, quotekeys, bless, maxdepth, 
				sortkeys);
			SvREFCNT_dec(e);
		    }
		}
		
		SvREFCNT_dec(newapad);
		SvREFCNT_dec(nname);
	    }
	}
	else if (val == &PL_sv_undef || !SvOK(val)) {
	    sv_catpvn(retval, "undef", 5);
	}
	else {
        integer_came_from_string:
	    c = SvPV(val, i);
	    if (DO_UTF8(val))
	        i += esc_q_utf8(aTHX_ retval, c, i);
	    else {
		sv_grow(retval, SvCUR(retval)+3+2*i); /* 3: ""\0 */
		r = SvPVX(retval) + SvCUR(retval);
		r[0] = '\'';
		i += esc_q(r+1, c, i);
		++i;
		r[i++] = '\'';
		r[i] = '\0';
		SvCUR_set(retval, SvCUR(retval)+i);
	    }
	}
    }

    if (idlen) {
	if (deepcopy)
	    (void)hv_delete(seenhv, id, idlen, G_DISCARD);
	else if (namelen && seenentry) {
	    SV *mark = *av_fetch(seenentry, 2, TRUE);
	    sv_setiv(mark,1);
	}
    }
    return 1;
}


MODULE = Data::Dumper		PACKAGE = Data::Dumper         PREFIX = Data_Dumper_

#
# This is the exact equivalent of Dump.  Well, almost. The things that are
# different as of now (due to Laziness):
#   * doesnt do double-quotes yet.
#

void
Data_Dumper_Dumpxs(href, ...)
	SV	*href;
	PROTOTYPE: $;$$
	PPCODE:
	{
	    HV *hv;
	    SV *retval, *valstr;
	    HV *seenhv = Nullhv;
	    AV *postav, *todumpav, *namesav;
	    I32 level = 0;
	    I32 indent, terse, i, imax, postlen;
	    SV **svp;
	    SV *val, *name, *pad, *xpad, *apad, *sep, *pair, *varname;
	    SV *freezer, *toaster, *bless, *sortkeys;
	    I32 purity, deepcopy, quotekeys, maxdepth = 0;
	    char tmpbuf[1024];
	    I32 gimme = GIMME;

	    if (!SvROK(href)) {		/* call new to get an object first */
		if (items < 2)
		    croak("Usage: Data::Dumper::Dumpxs(PACKAGE, VAL_ARY_REF, [NAME_ARY_REF])");
		
		ENTER;
		SAVETMPS;
		
		PUSHMARK(sp);
		XPUSHs(href);
		XPUSHs(sv_2mortal(newSVsv(ST(1))));
		if (items >= 3)
		    XPUSHs(sv_2mortal(newSVsv(ST(2))));
		PUTBACK;
		i = perl_call_method("new", G_SCALAR);
		SPAGAIN;
		if (i)
		    href = newSVsv(POPs);

		PUTBACK;
		FREETMPS;
		LEAVE;
		if (i)
		    (void)sv_2mortal(href);
	    }

	    todumpav = namesav = Nullav;
	    seenhv = Nullhv;
	    val = pad = xpad = apad = sep = pair = varname
		= freezer = toaster = bless = &PL_sv_undef;
	    name = sv_newmortal();
	    indent = 2;
	    terse = purity = deepcopy = 0;
	    quotekeys = 1;
	
	    retval = newSVpvn("", 0);
	    if (SvROK(href)
		&& (hv = (HV*)SvRV((SV*)href))
		&& SvTYPE(hv) == SVt_PVHV)		{

		if ((svp = hv_fetch(hv, "seen", 4, FALSE)) && SvROK(*svp))
		    seenhv = (HV*)SvRV(*svp);
		if ((svp = hv_fetch(hv, "todump", 6, FALSE)) && SvROK(*svp))
		    todumpav = (AV*)SvRV(*svp);
		if ((svp = hv_fetch(hv, "names", 5, FALSE)) && SvROK(*svp))
		    namesav = (AV*)SvRV(*svp);
		if ((svp = hv_fetch(hv, "indent", 6, FALSE)))
		    indent = SvIV(*svp);
		if ((svp = hv_fetch(hv, "purity", 6, FALSE)))
		    purity = SvIV(*svp);
		if ((svp = hv_fetch(hv, "terse", 5, FALSE)))
		    terse = SvTRUE(*svp);
#if 0 /* useqq currently unused */
		if ((svp = hv_fetch(hv, "useqq", 5, FALSE)))
		    useqq = SvTRUE(*svp);
#endif
		if ((svp = hv_fetch(hv, "pad", 3, FALSE)))
		    pad = *svp;
		if ((svp = hv_fetch(hv, "xpad", 4, FALSE)))
		    xpad = *svp;
		if ((svp = hv_fetch(hv, "apad", 4, FALSE)))
		    apad = *svp;
		if ((svp = hv_fetch(hv, "sep", 3, FALSE)))
		    sep = *svp;
		if ((svp = hv_fetch(hv, "pair", 4, FALSE)))
		    pair = *svp;
		if ((svp = hv_fetch(hv, "varname", 7, FALSE)))
		    varname = *svp;
		if ((svp = hv_fetch(hv, "freezer", 7, FALSE)))
		    freezer = *svp;
		if ((svp = hv_fetch(hv, "toaster", 7, FALSE)))
		    toaster = *svp;
		if ((svp = hv_fetch(hv, "deepcopy", 8, FALSE)))
		    deepcopy = SvTRUE(*svp);
		if ((svp = hv_fetch(hv, "quotekeys", 9, FALSE)))
		    quotekeys = SvTRUE(*svp);
		if ((svp = hv_fetch(hv, "bless", 5, FALSE)))
		    bless = *svp;
		if ((svp = hv_fetch(hv, "maxdepth", 8, FALSE)))
		    maxdepth = SvIV(*svp);
		if ((svp = hv_fetch(hv, "sortkeys", 8, FALSE))) {
		    sortkeys = *svp;
		    if (! SvTRUE(sortkeys))
			sortkeys = NULL;
		    else if (! (SvROK(sortkeys) &&
				SvTYPE(SvRV(sortkeys)) == SVt_PVCV) )
		    {
			/* flag to use qsortsv() for sorting hash keys */	
			sortkeys = &PL_sv_yes; 
		    }
		}
		postav = newAV();

		if (todumpav)
		    imax = av_len(todumpav);
		else
		    imax = -1;
		valstr = newSVpvn("",0);
		for (i = 0; i <= imax; ++i) {
		    SV *newapad;
		
		    av_clear(postav);
		    if ((svp = av_fetch(todumpav, i, FALSE)))
			val = *svp;
		    else
			val = &PL_sv_undef;
		    if ((svp = av_fetch(namesav, i, TRUE)))
			sv_setsv(name, *svp);
		    else
			(void)SvOK_off(name);
		
		    if (SvOK(name)) {
			if ((SvPVX(name))[0] == '*') {
			    if (SvROK(val)) {
				switch (SvTYPE(SvRV(val))) {
				case SVt_PVAV:
				    (SvPVX(name))[0] = '@';
				    break;
				case SVt_PVHV:
				    (SvPVX(name))[0] = '%';
				    break;
				case SVt_PVCV:
				    (SvPVX(name))[0] = '*';
				    break;
				default:
				    (SvPVX(name))[0] = '$';
				    break;
				}
			    }
			    else
				(SvPVX(name))[0] = '$';
			}
			else if ((SvPVX(name))[0] != '$')
			    sv_insert(name, 0, 0, "$", 1);
		    }
		    else {
			STRLEN nchars = 0;
			sv_setpvn(name, "$", 1);
			sv_catsv(name, varname);
			(void) sprintf(tmpbuf, "%"IVdf, (IV)(i+1));
			nchars = strlen(tmpbuf);
			sv_catpvn(name, tmpbuf, nchars);
		    }
		
		    if (indent >= 2) {
			SV *tmpsv = sv_x(aTHX_ Nullsv, " ", 1, SvCUR(name)+3);
			newapad = newSVsv(apad);
			sv_catsv(newapad, tmpsv);
			SvREFCNT_dec(tmpsv);
		    }
		    else
			newapad = apad;
		
		    DD_dump(aTHX_ val, SvPVX(name), SvCUR(name), valstr, seenhv,
			    postav, &level, indent, pad, xpad, newapad, sep, pair,
			    freezer, toaster, purity, deepcopy, quotekeys,
			    bless, maxdepth, sortkeys);
		
		    if (indent >= 2)
			SvREFCNT_dec(newapad);

		    postlen = av_len(postav);
		    if (postlen >= 0 || !terse) {
			sv_insert(valstr, 0, 0, " = ", 3);
			sv_insert(valstr, 0, 0, SvPVX(name), SvCUR(name));
			sv_catpvn(valstr, ";", 1);
		    }
		    sv_catsv(retval, pad);
		    sv_catsv(retval, valstr);
		    sv_catsv(retval, sep);
		    if (postlen >= 0) {
			I32 i;
			sv_catsv(retval, pad);
			for (i = 0; i <= postlen; ++i) {
			    SV *elem;
			    svp = av_fetch(postav, i, FALSE);
			    if (svp && (elem = *svp)) {
				sv_catsv(retval, elem);
				if (i < postlen) {
				    sv_catpvn(retval, ";", 1);
				    sv_catsv(retval, sep);
				    sv_catsv(retval, pad);
				}
			    }
			}
			sv_catpvn(retval, ";", 1);
			    sv_catsv(retval, sep);
		    }
		    sv_setpvn(valstr, "", 0);
		    if (gimme == G_ARRAY) {
			XPUSHs(sv_2mortal(retval));
			if (i < imax)	/* not the last time thro ? */
			    retval = newSVpvn("",0);
		    }
		}
		SvREFCNT_dec(postav);
		SvREFCNT_dec(valstr);
	    }
	    else
		croak("Call to new() method failed to return HASH ref");
	    if (gimme == G_SCALAR)
		XPUSHs(sv_2mortal(retval));
	}