Deprecate (and remove core use of ) Nullav, Nullcv, Nullgv, Nullhe,

[p5sagit/p5-mst-13.2.git] / hv.h

diff --git a/hv.h b/hv.h
index b1f2ce2..5be1959 100644 (file)
--- a/hv.h
+++ b/hv.h
@@ -1,7 +1,7 @@
 /*    hv.h
  *
  *    Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999,
- *    2000, 2001, 2002, 2003, 2005, 2006, 2007, by Larry Wall and others
+ *    2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -68,7 +68,7 @@ struct xpvhv_aux {
 
 #define _XPVHV_ALLOCATED_HEAD                                              \
     STRLEN     xhv_fill;       /* how full xhv_array currently is */       \
-    STRLEN     xhv_max;        /* subscript of last element of xhv_array */
+    STRLEN     xhv_max         /* subscript of last element of xhv_array */
 
 #define _XPVHV_HEAD    \
     union _xnvu xnv_u; \
@@ -165,6 +165,8 @@ is to be expected. (For information only--not to be used).
 =for apidoc AmU||Nullhv
 Null HV pointer.
 
+(deprecated - use C<(HV *)NULL> instead)
+
 =head1 Hash Manipulation Functions
 
 =for apidoc Am|char*|HvNAME|HV* stash
@@ -198,7 +200,18 @@ variable C<PL_na>, though this is rather less efficient than using a local
 variable.  Remember though, that hash keys in perl are free to contain
 embedded nulls, so using C<strlen()> or similar is not a good way to find
 the length of hash keys. This is very similar to the C<SvPV()> macro
-described elsewhere in this document.
+described elsewhere in this document. See also C<HeUTF8>.
+
+If you are using C<HePV> to get values to pass to C<newSVpvn()> to create a
+new SV, you should consider using C<newSVhek(HeKEY_hek(he))> as it is more
+efficient.
+
+=for apidoc Am|char*|HeUTF8|HE* he|STRLEN len
+Returns whether the C<char *> value returned by C<HePV> is encoded in UTF-8,
+doing any necessary dereferencing of possibly C<SV*> keys.  The value returned
+will be 0 or non-0, not necessarily 1 (or even a value with any low bits set),
+so B<do not> blindly assign this to a C<bool> variable, as C<bool> may be a
+typedef for C<char>.
 
 =for apidoc Am|SV*|HeSVKEY|HE* he
 Returns the key as an C<SV*>, or C<NULL> if the hash entry does not
@@ -219,8 +232,9 @@ C<SV*>.
 /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
 #define HEf_SVKEY      -2      /* hent_key is an SV* */
 
-
-#define Nullhv Null(HV*)
+#ifndef PERL_CORE
+#  define Nullhv Null(HV*)
+#endif
 #define HvARRAY(hv)    ((hv)->sv_u.svu_hash)
 #define HvFILL(hv)     ((XPVHV*)  SvANY(hv))->xhv_fill
 #define HvMAX(hv)      ((XPVHV*)  SvANY(hv))->xhv_max
@@ -289,7 +303,9 @@ C<SV*>.
 #define HvREHASH_on(hv)                (SvFLAGS(hv) |= SVphv_REHASH)
 #define HvREHASH_off(hv)       (SvFLAGS(hv) &= ~SVphv_REHASH)
 
-#define Nullhe Null(HE*)
+#ifndef PERL_CORE
+#  define Nullhe Null(HE*)
+#endif
 #define HeNEXT(he)             (he)->hent_next
 #define HeKEY_hek(he)          (he)->hent_hek
 #define HeKEY(he)              HEK_KEY(HeKEY_hek(he))
@@ -305,6 +321,9 @@ C<SV*>.
 #define HePV(he,lp)            ((HeKLEN(he) == HEf_SVKEY) ?            \
                                 SvPV(HeKEY_sv(he),lp) :                \
                                 ((lp = HeKLEN(he)), HeKEY(he)))
+#define HeUTF8(he)             ((HeKLEN(he) == HEf_SVKEY) ?            \
+                                SvUTF8(HeKEY_sv(he)) :                 \
+                                (U32)HeKUTF8(he))
 
 #define HeSVKEY(he)            ((HeKEY(he) &&                          \
                                  HeKLEN(he) == HEf_SVKEY) ?            \
@@ -313,12 +332,14 @@ C<SV*>.
 #define HeSVKEY_force(he)      (HeKEY(he) ?                            \
                                 ((HeKLEN(he) == HEf_SVKEY) ?           \
                                  HeKEY_sv(he) :                        \
-                                 sv_2mortal(newSVpvn(HeKEY(he),        \
-                                                    HeKLEN(he)))) :    \
+                                 newSVpvn_flags(HeKEY(he),             \
+                                                HeKLEN(he), SVs_TEMP)) : \
                                 &PL_sv_undef)
 #define HeSVKEY_set(he,sv)     ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))
 
-#define Nullhek Null(HEK*)
+#ifndef PERL_CORE
+#  define Nullhek Null(HEK*)
+#endif
 #define HEK_BASESIZE           STRUCT_OFFSET(HEK, hek_key[0])
 #define HEK_HASH(hek)          (hek)->hek_hash
 #define HEK_LEN(hek)           (hek)->hek_len