1 /*-------------------------------------------------------------------------
4 * Functions for the SQL datatypes BIT() and BIT VARYING().
6 * Code originally contributed by Adriaan Joubert.
8 * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
9 * Portions Copyright (c) 1994, Regents of the University of California
11 * src/include/utils/varbit.h
13 *-------------------------------------------------------------------------
23 * Modeled on struct varlena from postgres.h, but data type is bits8.
27 int32 vl_len_; /* varlena header (do not touch directly!) */
28 int32 bit_len; /* number of valid bits */
29 bits8 bit_dat[1]; /* bit string, most sig. byte first */
33 * fmgr interface macros
35 * BIT and BIT VARYING are toastable varlena types. They are the same
36 * as far as representation goes, so we just have one set of macros.
38 #define DatumGetVarBitP(X) ((VarBit *) PG_DETOAST_DATUM(X))
39 #define DatumGetVarBitPCopy(X) ((VarBit *) PG_DETOAST_DATUM_COPY(X))
40 #define VarBitPGetDatum(X) PointerGetDatum(X)
41 #define PG_GETARG_VARBIT_P(n) DatumGetVarBitP(PG_GETARG_DATUM(n))
42 #define PG_GETARG_VARBIT_P_COPY(n) DatumGetVarBitPCopy(PG_GETARG_DATUM(n))
43 #define PG_RETURN_VARBIT_P(x) return VarBitPGetDatum(x)
45 /* Header overhead *in addition to* VARHDRSZ */
46 #define VARBITHDRSZ sizeof(int32)
47 /* Number of bits in this bit string */
48 #define VARBITLEN(PTR) (((VarBit *) (PTR))->bit_len)
49 /* Pointer to the first byte containing bit string data */
50 #define VARBITS(PTR) (((VarBit *) (PTR))->bit_dat)
51 /* Number of bytes in the data section of a bit string */
52 #define VARBITBYTES(PTR) (VARSIZE(PTR) - VARHDRSZ - VARBITHDRSZ)
53 /* Padding of the bit string at the end (in bits) */
54 #define VARBITPAD(PTR) (VARBITBYTES(PTR)*BITS_PER_BYTE - VARBITLEN(PTR))
55 /* Number of bytes needed to store a bit string of a given length */
56 #define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \
57 VARHDRSZ + VARBITHDRSZ)
59 * Maximum number of bits. Several code sites assume no overflow from
60 * computing bitlen + X; VARBITTOTALLEN() has the largest such X.
62 #define VARBITMAXLEN (INT_MAX - BITS_PER_BYTE + 1)
63 /* pointer beyond the end of the bit string (like end() in STL containers) */
64 #define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR))
65 /* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */
69 extern Datum bit_in(PG_FUNCTION_ARGS);
70 extern Datum bit_out(PG_FUNCTION_ARGS);
71 extern Datum bit_recv(PG_FUNCTION_ARGS);
72 extern Datum bit_send(PG_FUNCTION_ARGS);
73 extern Datum bittypmodin(PG_FUNCTION_ARGS);
74 extern Datum bittypmodout(PG_FUNCTION_ARGS);
75 extern Datum varbit_in(PG_FUNCTION_ARGS);
76 extern Datum varbit_out(PG_FUNCTION_ARGS);
77 extern Datum varbit_recv(PG_FUNCTION_ARGS);
78 extern Datum varbit_send(PG_FUNCTION_ARGS);
79 extern Datum varbittypmodin(PG_FUNCTION_ARGS);
80 extern Datum varbittypmodout(PG_FUNCTION_ARGS);
81 extern Datum bit(PG_FUNCTION_ARGS);
82 extern Datum varbit_transform(PG_FUNCTION_ARGS);
83 extern Datum varbit(PG_FUNCTION_ARGS);
84 extern Datum biteq(PG_FUNCTION_ARGS);
85 extern Datum bitne(PG_FUNCTION_ARGS);
86 extern Datum bitlt(PG_FUNCTION_ARGS);
87 extern Datum bitle(PG_FUNCTION_ARGS);
88 extern Datum bitgt(PG_FUNCTION_ARGS);
89 extern Datum bitge(PG_FUNCTION_ARGS);
90 extern Datum bitcmp(PG_FUNCTION_ARGS);
92 /* avoid the names bitand and bitor, since they are C++ keywords */
93 extern Datum bit_and(PG_FUNCTION_ARGS);
94 extern Datum bit_or(PG_FUNCTION_ARGS);
95 extern Datum bitxor(PG_FUNCTION_ARGS);
96 extern Datum bitnot(PG_FUNCTION_ARGS);
97 extern Datum bitshiftleft(PG_FUNCTION_ARGS);
98 extern Datum bitshiftright(PG_FUNCTION_ARGS);
99 extern Datum bitcat(PG_FUNCTION_ARGS);
100 extern Datum bitsubstr(PG_FUNCTION_ARGS);
101 extern Datum bitsubstr_no_len(PG_FUNCTION_ARGS);
102 extern Datum bitoverlay(PG_FUNCTION_ARGS);
103 extern Datum bitoverlay_no_len(PG_FUNCTION_ARGS);
104 extern Datum bitlength(PG_FUNCTION_ARGS);
105 extern Datum bitoctetlength(PG_FUNCTION_ARGS);
106 extern Datum bitfromint4(PG_FUNCTION_ARGS);
107 extern Datum bittoint4(PG_FUNCTION_ARGS);
108 extern Datum bitfromint8(PG_FUNCTION_ARGS);
109 extern Datum bittoint8(PG_FUNCTION_ARGS);
110 extern Datum bitposition(PG_FUNCTION_ARGS);
111 extern Datum bitsetbit(PG_FUNCTION_ARGS);
112 extern Datum bitgetbit(PG_FUNCTION_ARGS);