Taint safe Cwd::_qnx_abs_path()

[perl5.git] / hv.c

diff --git a/hv.c b/hv.c
index ee08ce4..63e112a 100644 (file)
--- a/hv.c
+++ b/hv.c
@@ -308,11 +308,13 @@ S_hv_fetch_flags(pTHX_ HV *hv, const char *key, I32 klen, I32 lval, int flags)
             }
             else
                 HeKFLAGS(entry) = flags;
+            if (flags)
+                HvHASKFLAGS_on(hv);
         }
         if (flags & HVhek_FREEKEY)
             Safefree(key);
        /* if we find a placeholder, we pretend we haven't found anything */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            break;
        return &HeVAL(entry);
 
@@ -478,11 +480,13 @@ Perl_hv_fetch_ent(pTHX_ HV *hv, SV *keysv, I32 lval, register U32 hash)
             }
             else
                 HeKFLAGS(entry) = flags;
+            if (flags)
+                HvHASKFLAGS_on(hv);
         }
        if (key != keysave)
            Safefree(key);
        /* if we find a placeholder, we pretend we haven't found anything */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            break;
        return entry;
     }
@@ -645,7 +649,7 @@ Perl_hv_store_flags(pTHX_ HV *hv, const char *key, I32 klen, SV *val,
            continue;
        if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
            continue;
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            xhv->xhv_placeholders--; /* yes, can store into placeholder slot */
        else
            SvREFCNT_dec(HeVAL(entry));
@@ -653,7 +657,7 @@ Perl_hv_store_flags(pTHX_ HV *hv, const char *key, I32 klen, SV *val,
             /* We have been requested to insert a placeholder. Currently
                only Storable is allowed to do this.  */
             xhv->xhv_placeholders++;
-            HeVAL(entry) = &PL_sv_undef;
+            HeVAL(entry) = &PL_sv_placeholder;
         } else
             HeVAL(entry) = val;
 
@@ -696,7 +700,7 @@ Perl_hv_store_flags(pTHX_ HV *hv, const char *key, I32 klen, SV *val,
         /* We have been requested to insert a placeholder. Currently
            only Storable is allowed to do this.  */
         xhv->xhv_placeholders++;
-        HeVAL(entry) = &PL_sv_undef;
+        HeVAL(entry) = &PL_sv_placeholder;
     } else
         HeVAL(entry) = val;
     HeNEXT(entry) = *oentry;
@@ -820,7 +824,7 @@ Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, U32 hash)
            continue;
        if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
            continue;
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            xhv->xhv_placeholders--; /* yes, can store into placeholder slot */
        else
            SvREFCNT_dec(HeVAL(entry));
@@ -964,7 +968,7 @@ Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen, I32 flags)
        if (k_flags & HVhek_FREEKEY)
            Safefree(key);
        /* if placeholder is here, it's already been deleted.... */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
        {
            if (SvREADONLY(hv))
                return Nullsv;  /* if still SvREADONLY, leave it deleted. */
@@ -994,7 +998,7 @@ Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen, I32 flags)
            sv = Nullsv;
        else {
            sv = sv_2mortal(HeVAL(entry));
-           HeVAL(entry) = &PL_sv_undef;
+           HeVAL(entry) = &PL_sv_placeholder;
        }
 
        /*
@@ -1004,7 +1008,7 @@ Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen, I32 flags)
         * an error.
         */
        if (SvREADONLY(hv)) {
-           HeVAL(entry) = &PL_sv_undef;
+           HeVAL(entry) = &PL_sv_placeholder;
            /* We'll be saving this slot, so the number of allocated keys
             * doesn't go down, but the number placeholders goes up */
            xhv->xhv_placeholders++; /* HvPLACEHOLDERS(hv)++ */
@@ -1123,7 +1127,7 @@ Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash)
             Safefree(key);
 
        /* if placeholder is here, it's already been deleted.... */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
        {
            if (SvREADONLY(hv))
                return Nullsv; /* if still SvREADONLY, leave it deleted. */
@@ -1152,7 +1156,7 @@ Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash)
            sv = Nullsv;
        else {
            sv = sv_2mortal(HeVAL(entry));
-           HeVAL(entry) = &PL_sv_undef;
+           HeVAL(entry) = &PL_sv_placeholder;
        }
 
        /*
@@ -1162,7 +1166,7 @@ Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash)
         * an error.
         */
        if (SvREADONLY(hv)) {
-           HeVAL(entry) = &PL_sv_undef;
+           HeVAL(entry) = &PL_sv_placeholder;
            /* We'll be saving this slot, so the number of allocated keys
             * doesn't go down, but the number placeholders goes up */
            xhv->xhv_placeholders++; /* HvPLACEHOLDERS(hv)++ */
@@ -1271,7 +1275,7 @@ Perl_hv_exists(pTHX_ HV *hv, const char *key, I32 klen)
        if (k_flags & HVhek_FREEKEY)
            Safefree(key);
        /* If we find the key, but the value is a placeholder, return false. */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            return FALSE;
 
        return TRUE;
@@ -1376,7 +1380,7 @@ Perl_hv_exists_ent(pTHX_ HV *hv, SV *keysv, U32 hash)
        if (k_flags & HVhek_FREEKEY)
            Safefree(key);
        /* If we find the key, but the value is a placeholder, return false. */
-       if (HeVAL(entry) == &PL_sv_undef)
+       if (HeVAL(entry) == &PL_sv_placeholder)
            return FALSE;
        return TRUE;
     }
@@ -1705,15 +1709,15 @@ Perl_hv_clear(pTHX_ HV *hv)
 
     xhv = (XPVHV*)SvANY(hv);
 
-    if(SvREADONLY(hv)) {
+    if (SvREADONLY(hv)) {
        /* restricted hash: convert all keys to placeholders */
        I32 i;
        HE* entry;
-       for (i=0; i< (I32) xhv->xhv_max; i++) {
+       for (i = 0; i <= (I32) xhv->xhv_max; i++) {
            entry = ((HE**)xhv->xhv_array)[i];
            for (; entry; entry = HeNEXT(entry)) {
                /* not already placeholder */
-               if (HeVAL(entry) != &PL_sv_undef) {
+               if (HeVAL(entry) != &PL_sv_placeholder) {
                    if (HeVAL(entry) && SvREADONLY(HeVAL(entry))) {
                        SV* keysv = hv_iterkeysv(entry);
                        Perl_croak(aTHX_
@@ -1721,7 +1725,7 @@ Perl_hv_clear(pTHX_ HV *hv)
                                   keysv);
                    }
                    SvREFCNT_dec(HeVAL(entry));
-                   HeVAL(entry) = &PL_sv_undef;
+                   HeVAL(entry) = &PL_sv_placeholder;
                    xhv->xhv_placeholders++; /* HvPLACEHOLDERS(hv)++ */
                }
            }
@@ -1875,9 +1879,8 @@ Returns entries from a hash iterator.  See C<hv_iterinit> and C<hv_iternext>.
 The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is
 set the placeholders keys (for restricted hashes) will be returned in addition
 to normal keys. By default placeholders are automatically skipped over.
-Currently a placeholder is implemented with a value that is literally
-<&Perl_sv_undef> (a regular C<undef> value is a normal read-write SV for which
-C<!SvOK> is false). Note that the implementation of placeholders and
+Currently a placeholder is implemented with a value that is
+C<&Perl_sv_placeholder>. Note that the implementation of placeholders and
 restricted hashes may change, and the implementation currently is
 insufficiently abstracted for any change to be tidy.
 
@@ -1946,7 +1949,7 @@ Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags)
              * Skip past any placeholders -- don't want to include them in
              * any iteration.
              */
-            while (entry && HeVAL(entry) == &PL_sv_undef) {
+            while (entry && HeVAL(entry) == &PL_sv_placeholder) {
                 entry = HeNEXT(entry);
             }
        }
@@ -1966,7 +1969,7 @@ Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags)
         if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) {
             /* If we have an entry, but it's a placeholder, don't count it.
               Try the next.  */
-           while (entry && HeVAL(entry) == &PL_sv_undef)
+           while (entry && HeVAL(entry) == &PL_sv_placeholder)
                entry = HeNEXT(entry);
        }
        /* Will loop again if this linked list starts NULL