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cstring, rather than text, so as to eliminate useless conversions inside the parser. Per recent discussion.
2334 lines
52 KiB
C
2334 lines
52 KiB
C
/*-------------------------------------------------------------------------
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*
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* varlena.c
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* Functions for the variable-length built-in types.
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.123 2005/05/30 01:20:50 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include "access/tuptoaster.h"
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#include "catalog/pg_type.h"
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#include "lib/stringinfo.h"
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#include "libpq/crypt.h"
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#include "libpq/pqformat.h"
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "parser/scansup.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/pg_locale.h"
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typedef struct varlena unknown;
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#define DatumGetUnknownP(X) ((unknown *) PG_DETOAST_DATUM(X))
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#define DatumGetUnknownPCopy(X) ((unknown *) PG_DETOAST_DATUM_COPY(X))
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#define PG_GETARG_UNKNOWN_P(n) DatumGetUnknownP(PG_GETARG_DATUM(n))
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#define PG_GETARG_UNKNOWN_P_COPY(n) DatumGetUnknownPCopy(PG_GETARG_DATUM(n))
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#define PG_RETURN_UNKNOWN_P(x) PG_RETURN_POINTER(x)
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#define PG_TEXTARG_GET_STR(arg_) \
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DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(arg_)))
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#define PG_TEXT_GET_STR(textp_) \
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DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp_)))
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#define PG_STR_GET_TEXT(str_) \
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DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(str_)))
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#define TEXTLEN(textp) \
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text_length(PointerGetDatum(textp))
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#define TEXTPOS(buf_text, from_sub_text) \
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text_position(buf_text, from_sub_text, 1)
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#define TEXTDUP(textp) \
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DatumGetTextPCopy(PointerGetDatum(textp))
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#define LEFT(buf_text, from_sub_text) \
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text_substring(PointerGetDatum(buf_text), \
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1, \
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TEXTPOS(buf_text, from_sub_text) - 1, false)
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#define RIGHT(buf_text, from_sub_text, from_sub_text_len) \
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text_substring(PointerGetDatum(buf_text), \
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TEXTPOS(buf_text, from_sub_text) + (from_sub_text_len), \
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-1, true)
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static int text_cmp(text *arg1, text *arg2);
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static int32 text_length(Datum str);
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static int32 text_position(text *t1, text *t2, int matchnum);
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static text *text_substring(Datum str,
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int32 start,
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int32 length,
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bool length_not_specified);
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/*****************************************************************************
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* USER I/O ROUTINES *
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*****************************************************************************/
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#define VAL(CH) ((CH) - '0')
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#define DIG(VAL) ((VAL) + '0')
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/*
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* byteain - converts from printable representation of byte array
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*
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* Non-printable characters must be passed as '\nnn' (octal) and are
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* converted to internal form. '\' must be passed as '\\'.
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* ereport(ERROR, ...) if bad form.
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*
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* BUGS:
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* The input is scaned twice.
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* The error checking of input is minimal.
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*/
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Datum
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byteain(PG_FUNCTION_ARGS)
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{
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char *inputText = PG_GETARG_CSTRING(0);
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char *tp;
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char *rp;
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int byte;
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bytea *result;
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for (byte = 0, tp = inputText; *tp != '\0'; byte++)
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{
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if (tp[0] != '\\')
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tp++;
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else if ((tp[0] == '\\') &&
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(tp[1] >= '0' && tp[1] <= '3') &&
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(tp[2] >= '0' && tp[2] <= '7') &&
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(tp[3] >= '0' && tp[3] <= '7'))
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tp += 4;
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else if ((tp[0] == '\\') &&
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(tp[1] == '\\'))
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tp += 2;
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else
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{
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/*
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* one backslash, not followed by 0 or ### valid octal
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*/
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
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errmsg("invalid input syntax for type bytea")));
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}
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}
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byte += VARHDRSZ;
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result = (bytea *) palloc(byte);
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VARATT_SIZEP(result) = byte; /* set varlena length */
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tp = inputText;
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rp = VARDATA(result);
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while (*tp != '\0')
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{
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if (tp[0] != '\\')
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*rp++ = *tp++;
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else if ((tp[0] == '\\') &&
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(tp[1] >= '0' && tp[1] <= '3') &&
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(tp[2] >= '0' && tp[2] <= '7') &&
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(tp[3] >= '0' && tp[3] <= '7'))
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{
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byte = VAL(tp[1]);
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byte <<= 3;
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byte += VAL(tp[2]);
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byte <<= 3;
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*rp++ = byte + VAL(tp[3]);
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tp += 4;
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}
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else if ((tp[0] == '\\') &&
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(tp[1] == '\\'))
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{
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*rp++ = '\\';
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tp += 2;
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}
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else
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{
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/*
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* We should never get here. The first pass should not allow
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* it.
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*/
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
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errmsg("invalid input syntax for type bytea")));
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}
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}
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PG_RETURN_BYTEA_P(result);
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}
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/*
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* byteaout - converts to printable representation of byte array
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*
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* Non-printable characters are inserted as '\nnn' (octal) and '\' as
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* '\\'.
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*
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* NULL vlena should be an error--returning string with NULL for now.
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*/
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Datum
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byteaout(PG_FUNCTION_ARGS)
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{
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bytea *vlena = PG_GETARG_BYTEA_P(0);
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char *result;
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char *vp;
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char *rp;
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int val; /* holds unprintable chars */
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int i;
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int len;
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len = 1; /* empty string has 1 char */
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vp = VARDATA(vlena);
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for (i = VARSIZE(vlena) - VARHDRSZ; i != 0; i--, vp++)
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{
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if (*vp == '\\')
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len += 2;
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else if ((unsigned char) *vp < 0x20 || (unsigned char) *vp > 0x7e)
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len += 4;
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else
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len++;
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}
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rp = result = (char *) palloc(len);
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vp = VARDATA(vlena);
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for (i = VARSIZE(vlena) - VARHDRSZ; i != 0; i--, vp++)
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{
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if (*vp == '\\')
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{
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*rp++ = '\\';
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*rp++ = '\\';
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}
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else if ((unsigned char) *vp < 0x20 || (unsigned char) *vp > 0x7e)
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{
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val = *vp;
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rp[0] = '\\';
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rp[3] = DIG(val & 07);
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val >>= 3;
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rp[2] = DIG(val & 07);
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val >>= 3;
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rp[1] = DIG(val & 03);
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rp += 4;
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}
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else
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*rp++ = *vp;
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}
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*rp = '\0';
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PG_RETURN_CSTRING(result);
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}
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/*
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* bytearecv - converts external binary format to bytea
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*/
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Datum
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bytearecv(PG_FUNCTION_ARGS)
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{
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StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
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bytea *result;
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int nbytes;
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nbytes = buf->len - buf->cursor;
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result = (bytea *) palloc(nbytes + VARHDRSZ);
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VARATT_SIZEP(result) = nbytes + VARHDRSZ;
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pq_copymsgbytes(buf, VARDATA(result), nbytes);
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PG_RETURN_BYTEA_P(result);
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}
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/*
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* byteasend - converts bytea to binary format
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*
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* This is a special case: just copy the input...
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*/
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Datum
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byteasend(PG_FUNCTION_ARGS)
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{
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bytea *vlena = PG_GETARG_BYTEA_P_COPY(0);
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PG_RETURN_BYTEA_P(vlena);
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}
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/*
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* textin - converts "..." to internal representation
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*/
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Datum
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textin(PG_FUNCTION_ARGS)
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{
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char *inputText = PG_GETARG_CSTRING(0);
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text *result;
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int len;
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/* verify encoding */
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len = strlen(inputText);
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pg_verifymbstr(inputText, len, false);
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result = (text *) palloc(len + VARHDRSZ);
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VARATT_SIZEP(result) = len + VARHDRSZ;
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memcpy(VARDATA(result), inputText, len);
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PG_RETURN_TEXT_P(result);
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}
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/*
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* textout - converts internal representation to "..."
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*/
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Datum
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textout(PG_FUNCTION_ARGS)
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{
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text *t = PG_GETARG_TEXT_P(0);
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int len;
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char *result;
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len = VARSIZE(t) - VARHDRSZ;
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result = (char *) palloc(len + 1);
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memcpy(result, VARDATA(t), len);
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result[len] = '\0';
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PG_RETURN_CSTRING(result);
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}
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/*
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* textrecv - converts external binary format to text
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*/
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Datum
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textrecv(PG_FUNCTION_ARGS)
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{
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StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
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text *result;
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char *str;
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int nbytes;
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str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
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result = (text *) palloc(nbytes + VARHDRSZ);
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VARATT_SIZEP(result) = nbytes + VARHDRSZ;
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memcpy(VARDATA(result), str, nbytes);
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pfree(str);
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PG_RETURN_TEXT_P(result);
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}
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/*
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* textsend - converts text to binary format
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*/
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Datum
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textsend(PG_FUNCTION_ARGS)
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{
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text *t = PG_GETARG_TEXT_P(0);
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StringInfoData buf;
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pq_begintypsend(&buf);
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pq_sendtext(&buf, VARDATA(t), VARSIZE(t) - VARHDRSZ);
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PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
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}
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/*
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* unknownin - converts "..." to internal representation
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*/
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Datum
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unknownin(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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/* representation is same as cstring */
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PG_RETURN_CSTRING(pstrdup(str));
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}
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/*
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* unknownout - converts internal representation to "..."
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*/
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Datum
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unknownout(PG_FUNCTION_ARGS)
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{
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/* representation is same as cstring */
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char *str = PG_GETARG_CSTRING(0);
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PG_RETURN_CSTRING(pstrdup(str));
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}
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/*
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* unknownrecv - converts external binary format to unknown
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*/
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Datum
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unknownrecv(PG_FUNCTION_ARGS)
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{
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StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
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char *str;
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int nbytes;
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str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
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/* representation is same as cstring */
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PG_RETURN_CSTRING(str);
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}
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/*
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* unknownsend - converts unknown to binary format
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*/
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Datum
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unknownsend(PG_FUNCTION_ARGS)
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{
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/* representation is same as cstring */
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char *str = PG_GETARG_CSTRING(0);
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StringInfoData buf;
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pq_begintypsend(&buf);
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pq_sendtext(&buf, str, strlen(str));
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PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
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}
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/* ========== PUBLIC ROUTINES ========== */
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/*
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* textlen -
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* returns the logical length of a text*
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* (which is less than the VARSIZE of the text*)
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*/
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Datum
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textlen(PG_FUNCTION_ARGS)
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{
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Datum str = PG_GETARG_DATUM(0);
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/* try to avoid decompressing argument */
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PG_RETURN_INT32(text_length(str));
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}
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/*
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* text_length -
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* Does the real work for textlen()
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*
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* This is broken out so it can be called directly by other string processing
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* functions. Note that the argument is passed as a Datum, to indicate that
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* it may still be in compressed form. We can avoid decompressing it at all
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* in some cases.
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*/
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static int32
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text_length(Datum str)
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{
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/* fastpath when max encoding length is one */
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if (pg_database_encoding_max_length() == 1)
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PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
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else
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{
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text *t = DatumGetTextP(str);
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PG_RETURN_INT32(pg_mbstrlen_with_len(VARDATA(t),
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VARSIZE(t) - VARHDRSZ));
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}
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}
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/*
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* textoctetlen -
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* returns the physical length of a text*
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* (which is less than the VARSIZE of the text*)
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*/
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Datum
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textoctetlen(PG_FUNCTION_ARGS)
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{
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Datum str = PG_GETARG_DATUM(0);
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/* We need not detoast the input at all */
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PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
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}
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/*
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* textcat -
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* takes two text* and returns a text* that is the concatenation of
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* the two.
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*
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* Rewritten by Sapa, sapa@hq.icb.chel.su. 8-Jul-96.
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* Updated by Thomas, Thomas.Lockhart@jpl.nasa.gov 1997-07-10.
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* Allocate space for output in all cases.
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* XXX - thomas 1997-07-10
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*/
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Datum
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textcat(PG_FUNCTION_ARGS)
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{
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text *t1 = PG_GETARG_TEXT_P(0);
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text *t2 = PG_GETARG_TEXT_P(1);
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int len1,
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len2,
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len;
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text *result;
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char *ptr;
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len1 = (VARSIZE(t1) - VARHDRSZ);
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if (len1 < 0)
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len1 = 0;
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len2 = (VARSIZE(t2) - VARHDRSZ);
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if (len2 < 0)
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len2 = 0;
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len = len1 + len2 + VARHDRSZ;
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result = (text *) palloc(len);
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/* Set size of result string... */
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VARATT_SIZEP(result) = len;
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|
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/* Fill data field of result string... */
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ptr = VARDATA(result);
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if (len1 > 0)
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memcpy(ptr, VARDATA(t1), len1);
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if (len2 > 0)
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memcpy(ptr + len1, VARDATA(t2), len2);
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PG_RETURN_TEXT_P(result);
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}
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|
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/*
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* text_substr()
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* Return a substring starting at the specified position.
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* - thomas 1997-12-31
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*
|
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* Input:
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* - string
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* - starting position (is one-based)
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* - string length
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*
|
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* If the starting position is zero or less, then return from the start of the string
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* adjusting the length to be consistent with the "negative start" per SQL92.
|
|
* If the length is less than zero, return the remaining string.
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*
|
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* Added multibyte support.
|
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* - Tatsuo Ishii 1998-4-21
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* Changed behavior if starting position is less than one to conform to SQL92 behavior.
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|
* Formerly returned the entire string; now returns a portion.
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* - Thomas Lockhart 1998-12-10
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* Now uses faster TOAST-slicing interface
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* - John Gray 2002-02-22
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* Remove "#ifdef MULTIBYTE" and test for encoding_max_length instead. Change
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* behaviors conflicting with SQL92 to meet SQL92 (if E = S + L < S throw
|
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* error; if E < 1, return '', not entire string). Fixed MB related bug when
|
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* S > LC and < LC + 4 sometimes garbage characters are returned.
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* - Joe Conway 2002-08-10
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*/
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Datum
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text_substr(PG_FUNCTION_ARGS)
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{
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PG_RETURN_TEXT_P(text_substring(PG_GETARG_DATUM(0),
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PG_GETARG_INT32(1),
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PG_GETARG_INT32(2),
|
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false));
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}
|
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|
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/*
|
|
* text_substr_no_len -
|
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* Wrapper to avoid opr_sanity failure due to
|
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* one function accepting a different number of args.
|
|
*/
|
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Datum
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text_substr_no_len(PG_FUNCTION_ARGS)
|
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{
|
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PG_RETURN_TEXT_P(text_substring(PG_GETARG_DATUM(0),
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PG_GETARG_INT32(1),
|
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-1, true));
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}
|
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|
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/*
|
|
* text_substring -
|
|
* Does the real work for text_substr() and text_substr_no_len()
|
|
*
|
|
* This is broken out so it can be called directly by other string processing
|
|
* functions. Note that the argument is passed as a Datum, to indicate that
|
|
* it may still be in compressed/toasted form. We can avoid detoasting all
|
|
* of it in some cases.
|
|
*/
|
|
static text *
|
|
text_substring(Datum str, int32 start, int32 length, bool length_not_specified)
|
|
{
|
|
int32 eml = pg_database_encoding_max_length();
|
|
int32 S = start; /* start position */
|
|
int32 S1; /* adjusted start position */
|
|
int32 L1; /* adjusted substring length */
|
|
|
|
/* life is easy if the encoding max length is 1 */
|
|
if (eml == 1)
|
|
{
|
|
S1 = Max(S, 1);
|
|
|
|
if (length_not_specified) /* special case - get length to
|
|
* end of string */
|
|
L1 = -1;
|
|
else
|
|
{
|
|
/* end position */
|
|
int E = S + length;
|
|
|
|
/*
|
|
* A negative value for L is the only way for the end position
|
|
* to be before the start. SQL99 says to throw an error.
|
|
*/
|
|
if (E < S)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SUBSTRING_ERROR),
|
|
errmsg("negative substring length not allowed")));
|
|
|
|
/*
|
|
* A zero or negative value for the end position can happen if
|
|
* the start was negative or one. SQL99 says to return a
|
|
* zero-length string.
|
|
*/
|
|
if (E < 1)
|
|
return PG_STR_GET_TEXT("");
|
|
|
|
L1 = E - S1;
|
|
}
|
|
|
|
/*
|
|
* If the start position is past the end of the string, SQL99 says
|
|
* to return a zero-length string -- PG_GETARG_TEXT_P_SLICE() will
|
|
* do that for us. Convert to zero-based starting position
|
|
*/
|
|
return DatumGetTextPSlice(str, S1 - 1, L1);
|
|
}
|
|
else if (eml > 1)
|
|
{
|
|
/*
|
|
* When encoding max length is > 1, we can't get LC without
|
|
* detoasting, so we'll grab a conservatively large slice now and
|
|
* go back later to do the right thing
|
|
*/
|
|
int32 slice_start;
|
|
int32 slice_size;
|
|
int32 slice_strlen;
|
|
text *slice;
|
|
int32 E1;
|
|
int32 i;
|
|
char *p;
|
|
char *s;
|
|
text *ret;
|
|
|
|
/*
|
|
* if S is past the end of the string, the tuple toaster will
|
|
* return a zero-length string to us
|
|
*/
|
|
S1 = Max(S, 1);
|
|
|
|
/*
|
|
* We need to start at position zero because there is no way to
|
|
* know in advance which byte offset corresponds to the supplied
|
|
* start position.
|
|
*/
|
|
slice_start = 0;
|
|
|
|
if (length_not_specified) /* special case - get length to
|
|
* end of string */
|
|
slice_size = L1 = -1;
|
|
else
|
|
{
|
|
int E = S + length;
|
|
|
|
/*
|
|
* A negative value for L is the only way for the end position
|
|
* to be before the start. SQL99 says to throw an error.
|
|
*/
|
|
if (E < S)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SUBSTRING_ERROR),
|
|
errmsg("negative substring length not allowed")));
|
|
|
|
/*
|
|
* A zero or negative value for the end position can happen if
|
|
* the start was negative or one. SQL99 says to return a
|
|
* zero-length string.
|
|
*/
|
|
if (E < 1)
|
|
return PG_STR_GET_TEXT("");
|
|
|
|
/*
|
|
* if E is past the end of the string, the tuple toaster will
|
|
* truncate the length for us
|
|
*/
|
|
L1 = E - S1;
|
|
|
|
/*
|
|
* Total slice size in bytes can't be any longer than the
|
|
* start position plus substring length times the encoding max
|
|
* length.
|
|
*/
|
|
slice_size = (S1 + L1) * eml;
|
|
}
|
|
slice = DatumGetTextPSlice(str, slice_start, slice_size);
|
|
|
|
/* see if we got back an empty string */
|
|
if ((VARSIZE(slice) - VARHDRSZ) == 0)
|
|
return PG_STR_GET_TEXT("");
|
|
|
|
/* Now we can get the actual length of the slice in MB characters */
|
|
slice_strlen = pg_mbstrlen_with_len(VARDATA(slice), VARSIZE(slice) - VARHDRSZ);
|
|
|
|
/*
|
|
* Check that the start position wasn't > slice_strlen. If so,
|
|
* SQL99 says to return a zero-length string.
|
|
*/
|
|
if (S1 > slice_strlen)
|
|
return PG_STR_GET_TEXT("");
|
|
|
|
/*
|
|
* Adjust L1 and E1 now that we know the slice string length.
|
|
* Again remember that S1 is one based, and slice_start is zero
|
|
* based.
|
|
*/
|
|
if (L1 > -1)
|
|
E1 = Min(S1 + L1, slice_start + 1 + slice_strlen);
|
|
else
|
|
E1 = slice_start + 1 + slice_strlen;
|
|
|
|
/*
|
|
* Find the start position in the slice; remember S1 is not zero
|
|
* based
|
|
*/
|
|
p = VARDATA(slice);
|
|
for (i = 0; i < S1 - 1; i++)
|
|
p += pg_mblen(p);
|
|
|
|
/* hang onto a pointer to our start position */
|
|
s = p;
|
|
|
|
/*
|
|
* Count the actual bytes used by the substring of the requested
|
|
* length.
|
|
*/
|
|
for (i = S1; i < E1; i++)
|
|
p += pg_mblen(p);
|
|
|
|
ret = (text *) palloc(VARHDRSZ + (p - s));
|
|
VARATT_SIZEP(ret) = VARHDRSZ + (p - s);
|
|
memcpy(VARDATA(ret), s, (p - s));
|
|
|
|
return ret;
|
|
}
|
|
else
|
|
elog(ERROR, "invalid backend encoding: encoding max length < 1");
|
|
|
|
/* not reached: suppress compiler warning */
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* textpos -
|
|
* Return the position of the specified substring.
|
|
* Implements the SQL92 POSITION() function.
|
|
* Ref: A Guide To The SQL Standard, Date & Darwen, 1997
|
|
* - thomas 1997-07-27
|
|
*/
|
|
Datum
|
|
textpos(PG_FUNCTION_ARGS)
|
|
{
|
|
text *str = PG_GETARG_TEXT_P(0);
|
|
text *search_str = PG_GETARG_TEXT_P(1);
|
|
|
|
PG_RETURN_INT32(text_position(str, search_str, 1));
|
|
}
|
|
|
|
/*
|
|
* text_position -
|
|
* Does the real work for textpos()
|
|
*
|
|
* Inputs:
|
|
* t1 - string to be searched
|
|
* t2 - pattern to match within t1
|
|
* matchnum - number of the match to be found (1 is the first match)
|
|
* Result:
|
|
* Character index of the first matched char, starting from 1,
|
|
* or 0 if no match.
|
|
*
|
|
* This is broken out so it can be called directly by other string processing
|
|
* functions.
|
|
*/
|
|
static int32
|
|
text_position(text *t1, text *t2, int matchnum)
|
|
{
|
|
int match = 0,
|
|
pos = 0,
|
|
p,
|
|
px,
|
|
len1,
|
|
len2;
|
|
|
|
if (matchnum <= 0)
|
|
return 0; /* result for 0th match */
|
|
|
|
if (VARSIZE(t2) <= VARHDRSZ)
|
|
return 1; /* result for empty pattern */
|
|
|
|
len1 = (VARSIZE(t1) - VARHDRSZ);
|
|
len2 = (VARSIZE(t2) - VARHDRSZ);
|
|
|
|
if (pg_database_encoding_max_length() == 1)
|
|
{
|
|
/* simple case - single byte encoding */
|
|
char *p1,
|
|
*p2;
|
|
|
|
p1 = VARDATA(t1);
|
|
p2 = VARDATA(t2);
|
|
|
|
/* no use in searching str past point where search_str will fit */
|
|
px = (len1 - len2);
|
|
|
|
for (p = 0; p <= px; p++)
|
|
{
|
|
if ((*p1 == *p2) && (strncmp(p1, p2, len2) == 0))
|
|
{
|
|
if (++match == matchnum)
|
|
{
|
|
pos = p + 1;
|
|
break;
|
|
}
|
|
}
|
|
p1++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* not as simple - multibyte encoding */
|
|
pg_wchar *p1,
|
|
*p2,
|
|
*ps1,
|
|
*ps2;
|
|
|
|
ps1 = p1 = (pg_wchar *) palloc((len1 + 1) * sizeof(pg_wchar));
|
|
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t1), p1, len1);
|
|
len1 = pg_wchar_strlen(p1);
|
|
ps2 = p2 = (pg_wchar *) palloc((len2 + 1) * sizeof(pg_wchar));
|
|
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t2), p2, len2);
|
|
len2 = pg_wchar_strlen(p2);
|
|
|
|
/* no use in searching str past point where search_str will fit */
|
|
px = (len1 - len2);
|
|
|
|
for (p = 0; p <= px; p++)
|
|
{
|
|
if ((*p1 == *p2) && (pg_wchar_strncmp(p1, p2, len2) == 0))
|
|
{
|
|
if (++match == matchnum)
|
|
{
|
|
pos = p + 1;
|
|
break;
|
|
}
|
|
}
|
|
p1++;
|
|
}
|
|
|
|
pfree(ps1);
|
|
pfree(ps2);
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
|
|
/* varstr_cmp()
|
|
* Comparison function for text strings with given lengths.
|
|
* Includes locale support, but must copy strings to temporary memory
|
|
* to allow null-termination for inputs to strcoll().
|
|
* Returns -1, 0 or 1
|
|
*/
|
|
int
|
|
varstr_cmp(char *arg1, int len1, char *arg2, int len2)
|
|
{
|
|
int result;
|
|
|
|
/*
|
|
* Unfortunately, there is no strncoll(), so in the non-C locale case
|
|
* we have to do some memory copying. This turns out to be
|
|
* significantly slower, so we optimize the case where LC_COLLATE is
|
|
* C. We also try to optimize relatively-short strings by avoiding
|
|
* palloc/pfree overhead.
|
|
*/
|
|
#define STACKBUFLEN 1024
|
|
|
|
if (!lc_collate_is_c())
|
|
{
|
|
char a1buf[STACKBUFLEN];
|
|
char a2buf[STACKBUFLEN];
|
|
char *a1p,
|
|
*a2p;
|
|
|
|
if (len1 >= STACKBUFLEN)
|
|
a1p = (char *) palloc(len1 + 1);
|
|
else
|
|
a1p = a1buf;
|
|
if (len2 >= STACKBUFLEN)
|
|
a2p = (char *) palloc(len2 + 1);
|
|
else
|
|
a2p = a2buf;
|
|
|
|
memcpy(a1p, arg1, len1);
|
|
a1p[len1] = '\0';
|
|
memcpy(a2p, arg2, len2);
|
|
a2p[len2] = '\0';
|
|
|
|
result = strcoll(a1p, a2p);
|
|
|
|
if (len1 >= STACKBUFLEN)
|
|
pfree(a1p);
|
|
if (len2 >= STACKBUFLEN)
|
|
pfree(a2p);
|
|
}
|
|
else
|
|
{
|
|
result = strncmp(arg1, arg2, Min(len1, len2));
|
|
if ((result == 0) && (len1 != len2))
|
|
result = (len1 < len2) ? -1 : 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* text_cmp()
|
|
* Internal comparison function for text strings.
|
|
* Returns -1, 0 or 1
|
|
*/
|
|
static int
|
|
text_cmp(text *arg1, text *arg2)
|
|
{
|
|
char *a1p,
|
|
*a2p;
|
|
int len1,
|
|
len2;
|
|
|
|
a1p = VARDATA(arg1);
|
|
a2p = VARDATA(arg2);
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
return varstr_cmp(a1p, len1, a2p, len2);
|
|
}
|
|
|
|
/*
|
|
* Comparison functions for text strings.
|
|
*
|
|
* Note: btree indexes need these routines not to leak memory; therefore,
|
|
* be careful to free working copies of toasted datums. Most places don't
|
|
* need to be so careful.
|
|
*/
|
|
|
|
Datum
|
|
texteq(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
/* fast path for different-length inputs */
|
|
if (VARSIZE(arg1) != VARSIZE(arg2))
|
|
result = false;
|
|
else
|
|
result = (text_cmp(arg1, arg2) == 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
textne(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
/* fast path for different-length inputs */
|
|
if (VARSIZE(arg1) != VARSIZE(arg2))
|
|
result = true;
|
|
else
|
|
result = (text_cmp(arg1, arg2) != 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
text_lt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
result = (text_cmp(arg1, arg2) < 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
text_le(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
result = (text_cmp(arg1, arg2) <= 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
text_gt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
result = (text_cmp(arg1, arg2) > 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
text_ge(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
bool result;
|
|
|
|
result = (text_cmp(arg1, arg2) >= 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bttextcmp(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int32 result;
|
|
|
|
result = text_cmp(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(result);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_larger(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
text *result;
|
|
|
|
result = ((text_cmp(arg1, arg2) > 0) ? arg1 : arg2);
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|
|
|
|
Datum
|
|
text_smaller(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
text *result;
|
|
|
|
result = ((text_cmp(arg1, arg2) < 0) ? arg1 : arg2);
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* The following operators support character-by-character comparison
|
|
* of text data types, to allow building indexes suitable for LIKE
|
|
* clauses.
|
|
*/
|
|
|
|
static int
|
|
internal_text_pattern_compare(text *arg1, text *arg2)
|
|
{
|
|
int result;
|
|
|
|
result = memcmp(VARDATA(arg1), VARDATA(arg2),
|
|
Min(VARSIZE(arg1), VARSIZE(arg2)) - VARHDRSZ);
|
|
if (result != 0)
|
|
return result;
|
|
else if (VARSIZE(arg1) < VARSIZE(arg2))
|
|
return -1;
|
|
else if (VARSIZE(arg1) > VARSIZE(arg2))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_lt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result < 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_le(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result <= 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_eq(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
if (VARSIZE(arg1) != VARSIZE(arg2))
|
|
result = 1;
|
|
else
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result == 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_ge(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result >= 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_gt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result > 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
text_pattern_ne(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
if (VARSIZE(arg1) != VARSIZE(arg2))
|
|
result = 1;
|
|
else
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result != 0);
|
|
}
|
|
|
|
|
|
Datum
|
|
bttext_pattern_cmp(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg1 = PG_GETARG_TEXT_P(0);
|
|
text *arg2 = PG_GETARG_TEXT_P(1);
|
|
int result;
|
|
|
|
result = internal_text_pattern_compare(arg1, arg2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(result);
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------
|
|
* byteaoctetlen
|
|
*
|
|
* get the number of bytes contained in an instance of type 'bytea'
|
|
*-------------------------------------------------------------
|
|
*/
|
|
Datum
|
|
byteaoctetlen(PG_FUNCTION_ARGS)
|
|
{
|
|
Datum str = PG_GETARG_DATUM(0);
|
|
|
|
/* We need not detoast the input at all */
|
|
PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
|
|
}
|
|
|
|
/*
|
|
* byteacat -
|
|
* takes two bytea* and returns a bytea* that is the concatenation of
|
|
* the two.
|
|
*
|
|
* Cloned from textcat and modified as required.
|
|
*/
|
|
Datum
|
|
byteacat(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *t1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *t2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2,
|
|
len;
|
|
bytea *result;
|
|
char *ptr;
|
|
|
|
len1 = (VARSIZE(t1) - VARHDRSZ);
|
|
if (len1 < 0)
|
|
len1 = 0;
|
|
|
|
len2 = (VARSIZE(t2) - VARHDRSZ);
|
|
if (len2 < 0)
|
|
len2 = 0;
|
|
|
|
len = len1 + len2 + VARHDRSZ;
|
|
result = (bytea *) palloc(len);
|
|
|
|
/* Set size of result string... */
|
|
VARATT_SIZEP(result) = len;
|
|
|
|
/* Fill data field of result string... */
|
|
ptr = VARDATA(result);
|
|
if (len1 > 0)
|
|
memcpy(ptr, VARDATA(t1), len1);
|
|
if (len2 > 0)
|
|
memcpy(ptr + len1, VARDATA(t2), len2);
|
|
|
|
PG_RETURN_BYTEA_P(result);
|
|
}
|
|
|
|
#define PG_STR_GET_BYTEA(str_) \
|
|
DatumGetByteaP(DirectFunctionCall1(byteain, CStringGetDatum(str_)))
|
|
/*
|
|
* bytea_substr()
|
|
* Return a substring starting at the specified position.
|
|
* Cloned from text_substr and modified as required.
|
|
*
|
|
* Input:
|
|
* - string
|
|
* - starting position (is one-based)
|
|
* - string length (optional)
|
|
*
|
|
* If the starting position is zero or less, then return from the start of the string
|
|
* adjusting the length to be consistent with the "negative start" per SQL92.
|
|
* If the length is less than zero, an ERROR is thrown. If no third argument
|
|
* (length) is provided, the length to the end of the string is assumed.
|
|
*/
|
|
Datum
|
|
bytea_substr(PG_FUNCTION_ARGS)
|
|
{
|
|
int S = PG_GETARG_INT32(1); /* start position */
|
|
int S1; /* adjusted start position */
|
|
int L1; /* adjusted substring length */
|
|
|
|
S1 = Max(S, 1);
|
|
|
|
if (fcinfo->nargs == 2)
|
|
{
|
|
/*
|
|
* Not passed a length - PG_GETARG_BYTEA_P_SLICE() grabs
|
|
* everything to the end of the string if we pass it a negative
|
|
* value for length.
|
|
*/
|
|
L1 = -1;
|
|
}
|
|
else
|
|
{
|
|
/* end position */
|
|
int E = S + PG_GETARG_INT32(2);
|
|
|
|
/*
|
|
* A negative value for L is the only way for the end position to
|
|
* be before the start. SQL99 says to throw an error.
|
|
*/
|
|
if (E < S)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SUBSTRING_ERROR),
|
|
errmsg("negative substring length not allowed")));
|
|
|
|
/*
|
|
* A zero or negative value for the end position can happen if the
|
|
* start was negative or one. SQL99 says to return a zero-length
|
|
* string.
|
|
*/
|
|
if (E < 1)
|
|
PG_RETURN_BYTEA_P(PG_STR_GET_BYTEA(""));
|
|
|
|
L1 = E - S1;
|
|
}
|
|
|
|
/*
|
|
* If the start position is past the end of the string, SQL99 says to
|
|
* return a zero-length string -- PG_GETARG_TEXT_P_SLICE() will do
|
|
* that for us. Convert to zero-based starting position
|
|
*/
|
|
PG_RETURN_BYTEA_P(PG_GETARG_BYTEA_P_SLICE(0, S1 - 1, L1));
|
|
}
|
|
|
|
/*
|
|
* bytea_substr_no_len -
|
|
* Wrapper to avoid opr_sanity failure due to
|
|
* one function accepting a different number of args.
|
|
*/
|
|
Datum
|
|
bytea_substr_no_len(PG_FUNCTION_ARGS)
|
|
{
|
|
return bytea_substr(fcinfo);
|
|
}
|
|
|
|
/*
|
|
* byteapos -
|
|
* Return the position of the specified substring.
|
|
* Implements the SQL92 POSITION() function.
|
|
* Cloned from textpos and modified as required.
|
|
*/
|
|
Datum
|
|
byteapos(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *t1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *t2 = PG_GETARG_BYTEA_P(1);
|
|
int pos;
|
|
int px,
|
|
p;
|
|
int len1,
|
|
len2;
|
|
char *p1,
|
|
*p2;
|
|
|
|
if (VARSIZE(t2) <= VARHDRSZ)
|
|
PG_RETURN_INT32(1); /* result for empty pattern */
|
|
|
|
len1 = (VARSIZE(t1) - VARHDRSZ);
|
|
len2 = (VARSIZE(t2) - VARHDRSZ);
|
|
|
|
p1 = VARDATA(t1);
|
|
p2 = VARDATA(t2);
|
|
|
|
pos = 0;
|
|
px = (len1 - len2);
|
|
for (p = 0; p <= px; p++)
|
|
{
|
|
if ((*p2 == *p1) && (memcmp(p1, p2, len2) == 0))
|
|
{
|
|
pos = p + 1;
|
|
break;
|
|
};
|
|
p1++;
|
|
};
|
|
|
|
PG_RETURN_INT32(pos);
|
|
}
|
|
|
|
/*-------------------------------------------------------------
|
|
* byteaGetByte
|
|
*
|
|
* this routine treats "bytea" as an array of bytes.
|
|
* It returns the Nth byte (a number between 0 and 255).
|
|
*-------------------------------------------------------------
|
|
*/
|
|
Datum
|
|
byteaGetByte(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *v = PG_GETARG_BYTEA_P(0);
|
|
int32 n = PG_GETARG_INT32(1);
|
|
int len;
|
|
int byte;
|
|
|
|
len = VARSIZE(v) - VARHDRSZ;
|
|
|
|
if (n < 0 || n >= len)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
|
|
errmsg("index %d out of valid range, 0..%d",
|
|
n, len - 1)));
|
|
|
|
byte = ((unsigned char *) VARDATA(v))[n];
|
|
|
|
PG_RETURN_INT32(byte);
|
|
}
|
|
|
|
/*-------------------------------------------------------------
|
|
* byteaGetBit
|
|
*
|
|
* This routine treats a "bytea" type like an array of bits.
|
|
* It returns the value of the Nth bit (0 or 1).
|
|
*
|
|
*-------------------------------------------------------------
|
|
*/
|
|
Datum
|
|
byteaGetBit(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *v = PG_GETARG_BYTEA_P(0);
|
|
int32 n = PG_GETARG_INT32(1);
|
|
int byteNo,
|
|
bitNo;
|
|
int len;
|
|
int byte;
|
|
|
|
len = VARSIZE(v) - VARHDRSZ;
|
|
|
|
if (n < 0 || n >= len * 8)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
|
|
errmsg("index %d out of valid range, 0..%d",
|
|
n, len * 8 - 1)));
|
|
|
|
byteNo = n / 8;
|
|
bitNo = n % 8;
|
|
|
|
byte = ((unsigned char *) VARDATA(v))[byteNo];
|
|
|
|
if (byte & (1 << bitNo))
|
|
PG_RETURN_INT32(1);
|
|
else
|
|
PG_RETURN_INT32(0);
|
|
}
|
|
|
|
/*-------------------------------------------------------------
|
|
* byteaSetByte
|
|
*
|
|
* Given an instance of type 'bytea' creates a new one with
|
|
* the Nth byte set to the given value.
|
|
*
|
|
*-------------------------------------------------------------
|
|
*/
|
|
Datum
|
|
byteaSetByte(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *v = PG_GETARG_BYTEA_P(0);
|
|
int32 n = PG_GETARG_INT32(1);
|
|
int32 newByte = PG_GETARG_INT32(2);
|
|
int len;
|
|
bytea *res;
|
|
|
|
len = VARSIZE(v) - VARHDRSZ;
|
|
|
|
if (n < 0 || n >= len)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
|
|
errmsg("index %d out of valid range, 0..%d",
|
|
n, len - 1)));
|
|
|
|
/*
|
|
* Make a copy of the original varlena.
|
|
*/
|
|
res = (bytea *) palloc(VARSIZE(v));
|
|
memcpy((char *) res, (char *) v, VARSIZE(v));
|
|
|
|
/*
|
|
* Now set the byte.
|
|
*/
|
|
((unsigned char *) VARDATA(res))[n] = newByte;
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/*-------------------------------------------------------------
|
|
* byteaSetBit
|
|
*
|
|
* Given an instance of type 'bytea' creates a new one with
|
|
* the Nth bit set to the given value.
|
|
*
|
|
*-------------------------------------------------------------
|
|
*/
|
|
Datum
|
|
byteaSetBit(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *v = PG_GETARG_BYTEA_P(0);
|
|
int32 n = PG_GETARG_INT32(1);
|
|
int32 newBit = PG_GETARG_INT32(2);
|
|
bytea *res;
|
|
int len;
|
|
int oldByte,
|
|
newByte;
|
|
int byteNo,
|
|
bitNo;
|
|
|
|
len = VARSIZE(v) - VARHDRSZ;
|
|
|
|
if (n < 0 || n >= len * 8)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
|
|
errmsg("index %d out of valid range, 0..%d",
|
|
n, len * 8 - 1)));
|
|
|
|
byteNo = n / 8;
|
|
bitNo = n % 8;
|
|
|
|
/*
|
|
* sanity check!
|
|
*/
|
|
if (newBit != 0 && newBit != 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("new bit must be 0 or 1")));
|
|
|
|
/*
|
|
* Make a copy of the original varlena.
|
|
*/
|
|
res = (bytea *) palloc(VARSIZE(v));
|
|
memcpy((char *) res, (char *) v, VARSIZE(v));
|
|
|
|
/*
|
|
* Update the byte.
|
|
*/
|
|
oldByte = ((unsigned char *) VARDATA(res))[byteNo];
|
|
|
|
if (newBit == 0)
|
|
newByte = oldByte & (~(1 << bitNo));
|
|
else
|
|
newByte = oldByte | (1 << bitNo);
|
|
|
|
((unsigned char *) VARDATA(res))[byteNo] = newByte;
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
|
|
/* text_name()
|
|
* Converts a text type to a Name type.
|
|
*/
|
|
Datum
|
|
text_name(PG_FUNCTION_ARGS)
|
|
{
|
|
text *s = PG_GETARG_TEXT_P(0);
|
|
Name result;
|
|
int len;
|
|
|
|
len = VARSIZE(s) - VARHDRSZ;
|
|
|
|
/* Truncate oversize input */
|
|
if (len >= NAMEDATALEN)
|
|
len = NAMEDATALEN - 1;
|
|
|
|
#ifdef STRINGDEBUG
|
|
printf("text- convert string length %d (%d) ->%d\n",
|
|
VARSIZE(s) - VARHDRSZ, VARSIZE(s), len);
|
|
#endif
|
|
|
|
result = (Name) palloc(NAMEDATALEN);
|
|
memcpy(NameStr(*result), VARDATA(s), len);
|
|
|
|
/* now null pad to full length... */
|
|
while (len < NAMEDATALEN)
|
|
{
|
|
*(NameStr(*result) + len) = '\0';
|
|
len++;
|
|
}
|
|
|
|
PG_RETURN_NAME(result);
|
|
}
|
|
|
|
/* name_text()
|
|
* Converts a Name type to a text type.
|
|
*/
|
|
Datum
|
|
name_text(PG_FUNCTION_ARGS)
|
|
{
|
|
Name s = PG_GETARG_NAME(0);
|
|
text *result;
|
|
int len;
|
|
|
|
len = strlen(NameStr(*s));
|
|
|
|
#ifdef STRINGDEBUG
|
|
printf("text- convert string length %d (%d) ->%d\n",
|
|
VARSIZE(s) - VARHDRSZ, VARSIZE(s), len);
|
|
#endif
|
|
|
|
result = palloc(VARHDRSZ + len);
|
|
VARATT_SIZEP(result) = VARHDRSZ + len;
|
|
memcpy(VARDATA(result), NameStr(*s), len);
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* textToQualifiedNameList - convert a text object to list of names
|
|
*
|
|
* This implements the input parsing needed by nextval() and other
|
|
* functions that take a text parameter representing a qualified name.
|
|
* We split the name at dots, downcase if not double-quoted, and
|
|
* truncate names if they're too long.
|
|
*/
|
|
List *
|
|
textToQualifiedNameList(text *textval)
|
|
{
|
|
char *rawname;
|
|
List *result = NIL;
|
|
List *namelist;
|
|
ListCell *l;
|
|
|
|
/* Convert to C string (handles possible detoasting). */
|
|
/* Note we rely on being able to modify rawname below. */
|
|
rawname = DatumGetCString(DirectFunctionCall1(textout,
|
|
PointerGetDatum(textval)));
|
|
|
|
if (!SplitIdentifierString(rawname, '.', &namelist))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_NAME),
|
|
errmsg("invalid name syntax")));
|
|
|
|
if (namelist == NIL)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_NAME),
|
|
errmsg("invalid name syntax")));
|
|
|
|
foreach(l, namelist)
|
|
{
|
|
char *curname = (char *) lfirst(l);
|
|
|
|
result = lappend(result, makeString(pstrdup(curname)));
|
|
}
|
|
|
|
pfree(rawname);
|
|
list_free(namelist);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* SplitIdentifierString --- parse a string containing identifiers
|
|
*
|
|
* This is the guts of textToQualifiedNameList, and is exported for use in
|
|
* other situations such as parsing GUC variables. In the GUC case, it's
|
|
* important to avoid memory leaks, so the API is designed to minimize the
|
|
* amount of stuff that needs to be allocated and freed.
|
|
*
|
|
* Inputs:
|
|
* rawstring: the input string; must be overwritable! On return, it's
|
|
* been modified to contain the separated identifiers.
|
|
* separator: the separator punctuation expected between identifiers
|
|
* (typically '.' or ','). Whitespace may also appear around
|
|
* identifiers.
|
|
* Outputs:
|
|
* namelist: filled with a palloc'd list of pointers to identifiers within
|
|
* rawstring. Caller should freeList() this even on error return.
|
|
*
|
|
* Returns TRUE if okay, FALSE if there is a syntax error in the string.
|
|
*
|
|
* Note that an empty string is considered okay here, though not in
|
|
* textToQualifiedNameList.
|
|
*/
|
|
bool
|
|
SplitIdentifierString(char *rawstring, char separator,
|
|
List **namelist)
|
|
{
|
|
char *nextp = rawstring;
|
|
bool done = false;
|
|
|
|
*namelist = NIL;
|
|
|
|
while (isspace((unsigned char) *nextp))
|
|
nextp++; /* skip leading whitespace */
|
|
|
|
if (*nextp == '\0')
|
|
return true; /* allow empty string */
|
|
|
|
/* At the top of the loop, we are at start of a new identifier. */
|
|
do
|
|
{
|
|
char *curname;
|
|
char *endp;
|
|
|
|
if (*nextp == '\"')
|
|
{
|
|
/* Quoted name --- collapse quote-quote pairs, no downcasing */
|
|
curname = nextp + 1;
|
|
for (;;)
|
|
{
|
|
endp = strchr(nextp + 1, '\"');
|
|
if (endp == NULL)
|
|
return false; /* mismatched quotes */
|
|
if (endp[1] != '\"')
|
|
break; /* found end of quoted name */
|
|
/* Collapse adjacent quotes into one quote, and look again */
|
|
memmove(endp, endp + 1, strlen(endp));
|
|
nextp = endp;
|
|
}
|
|
/* endp now points at the terminating quote */
|
|
nextp = endp + 1;
|
|
}
|
|
else
|
|
{
|
|
/* Unquoted name --- extends to separator or whitespace */
|
|
char *downname;
|
|
int len;
|
|
|
|
curname = nextp;
|
|
while (*nextp && *nextp != separator &&
|
|
!isspace((unsigned char) *nextp))
|
|
nextp++;
|
|
endp = nextp;
|
|
if (curname == nextp)
|
|
return false; /* empty unquoted name not allowed */
|
|
|
|
/*
|
|
* Downcase the identifier, using same code as main lexer
|
|
* does.
|
|
*
|
|
* XXX because we want to overwrite the input in-place, we cannot
|
|
* support a downcasing transformation that increases the
|
|
* string length. This is not a problem given the current
|
|
* implementation of downcase_truncate_identifier, but we'll
|
|
* probably have to do something about this someday.
|
|
*/
|
|
len = endp - curname;
|
|
downname = downcase_truncate_identifier(curname, len, false);
|
|
Assert(strlen(downname) <= len);
|
|
strncpy(curname, downname, len);
|
|
pfree(downname);
|
|
}
|
|
|
|
while (isspace((unsigned char) *nextp))
|
|
nextp++; /* skip trailing whitespace */
|
|
|
|
if (*nextp == separator)
|
|
{
|
|
nextp++;
|
|
while (isspace((unsigned char) *nextp))
|
|
nextp++; /* skip leading whitespace for next */
|
|
/* we expect another name, so done remains false */
|
|
}
|
|
else if (*nextp == '\0')
|
|
done = true;
|
|
else
|
|
return false; /* invalid syntax */
|
|
|
|
/* Now safe to overwrite separator with a null */
|
|
*endp = '\0';
|
|
|
|
/* Truncate name if it's overlength */
|
|
truncate_identifier(curname, strlen(curname), false);
|
|
|
|
/*
|
|
* Finished isolating current name --- add it to list
|
|
*/
|
|
*namelist = lappend(*namelist, curname);
|
|
|
|
/* Loop back if we didn't reach end of string */
|
|
} while (!done);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Comparison Functions used for bytea
|
|
*
|
|
* Note: btree indexes need these routines not to leak memory; therefore,
|
|
* be careful to free working copies of toasted datums. Most places don't
|
|
* need to be so careful.
|
|
*****************************************************************************/
|
|
|
|
Datum
|
|
byteaeq(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = false;
|
|
else
|
|
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) == 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
byteane(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = true;
|
|
else
|
|
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) != 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bytealt(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 < len2)));
|
|
}
|
|
|
|
Datum
|
|
byteale(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 <= len2)));
|
|
}
|
|
|
|
Datum
|
|
byteagt(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 > len2)));
|
|
}
|
|
|
|
Datum
|
|
byteage(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 >= len2)));
|
|
}
|
|
|
|
Datum
|
|
byteacmp(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg1 = PG_GETARG_BYTEA_P(0);
|
|
bytea *arg2 = PG_GETARG_BYTEA_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
|
|
if ((cmp == 0) && (len1 != len2))
|
|
cmp = (len1 < len2) ? -1 : 1;
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(cmp);
|
|
}
|
|
|
|
/*
|
|
* replace_text
|
|
* replace all occurrences of 'old_sub_str' in 'orig_str'
|
|
* with 'new_sub_str' to form 'new_str'
|
|
*
|
|
* returns 'orig_str' if 'old_sub_str' == '' or 'orig_str' == ''
|
|
* otherwise returns 'new_str'
|
|
*/
|
|
Datum
|
|
replace_text(PG_FUNCTION_ARGS)
|
|
{
|
|
text *src_text = PG_GETARG_TEXT_P(0);
|
|
text *from_sub_text = PG_GETARG_TEXT_P(1);
|
|
text *to_sub_text = PG_GETARG_TEXT_P(2);
|
|
int src_text_len = TEXTLEN(src_text);
|
|
int from_sub_text_len = TEXTLEN(from_sub_text);
|
|
char *to_sub_str = PG_TEXT_GET_STR(to_sub_text);
|
|
text *left_text;
|
|
text *right_text;
|
|
text *buf_text;
|
|
text *ret_text;
|
|
int curr_posn;
|
|
StringInfo str = makeStringInfo();
|
|
|
|
if (src_text_len == 0 || from_sub_text_len == 0)
|
|
PG_RETURN_TEXT_P(src_text);
|
|
|
|
buf_text = TEXTDUP(src_text);
|
|
curr_posn = TEXTPOS(buf_text, from_sub_text);
|
|
|
|
while (curr_posn > 0)
|
|
{
|
|
left_text = LEFT(buf_text, from_sub_text);
|
|
right_text = RIGHT(buf_text, from_sub_text, from_sub_text_len);
|
|
|
|
appendStringInfoString(str, PG_TEXT_GET_STR(left_text));
|
|
appendStringInfoString(str, to_sub_str);
|
|
|
|
pfree(buf_text);
|
|
pfree(left_text);
|
|
buf_text = right_text;
|
|
curr_posn = TEXTPOS(buf_text, from_sub_text);
|
|
}
|
|
|
|
appendStringInfoString(str, PG_TEXT_GET_STR(buf_text));
|
|
pfree(buf_text);
|
|
|
|
ret_text = PG_STR_GET_TEXT(str->data);
|
|
pfree(str->data);
|
|
pfree(str);
|
|
|
|
PG_RETURN_TEXT_P(ret_text);
|
|
}
|
|
|
|
/*
|
|
* split_text
|
|
* parse input string
|
|
* return ord item (1 based)
|
|
* based on provided field separator
|
|
*/
|
|
Datum
|
|
split_text(PG_FUNCTION_ARGS)
|
|
{
|
|
text *inputstring = PG_GETARG_TEXT_P(0);
|
|
text *fldsep = PG_GETARG_TEXT_P(1);
|
|
int fldnum = PG_GETARG_INT32(2);
|
|
int inputstring_len = TEXTLEN(inputstring);
|
|
int fldsep_len = TEXTLEN(fldsep);
|
|
int start_posn;
|
|
int end_posn;
|
|
text *result_text;
|
|
|
|
/* field number is 1 based */
|
|
if (fldnum < 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("field position must be greater than zero")));
|
|
|
|
/* return empty string for empty input string */
|
|
if (inputstring_len < 1)
|
|
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
|
|
|
|
/* empty field separator */
|
|
if (fldsep_len < 1)
|
|
{
|
|
/* if first field, return input string, else empty string */
|
|
if (fldnum == 1)
|
|
PG_RETURN_TEXT_P(inputstring);
|
|
else
|
|
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
|
|
}
|
|
|
|
start_posn = text_position(inputstring, fldsep, fldnum - 1);
|
|
end_posn = text_position(inputstring, fldsep, fldnum);
|
|
|
|
if ((start_posn == 0) && (end_posn == 0)) /* fldsep not found */
|
|
{
|
|
/* if first field, return input string, else empty string */
|
|
if (fldnum == 1)
|
|
PG_RETURN_TEXT_P(inputstring);
|
|
else
|
|
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
|
|
}
|
|
else if (start_posn == 0)
|
|
{
|
|
/* first field requested */
|
|
result_text = LEFT(inputstring, fldsep);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
else if (end_posn == 0)
|
|
{
|
|
/* last field requested */
|
|
result_text = text_substring(PointerGetDatum(inputstring),
|
|
start_posn + fldsep_len,
|
|
-1, true);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
else
|
|
{
|
|
/* interior field requested */
|
|
result_text = text_substring(PointerGetDatum(inputstring),
|
|
start_posn + fldsep_len,
|
|
end_posn - start_posn - fldsep_len,
|
|
false);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* text_to_array
|
|
* parse input string
|
|
* return text array of elements
|
|
* based on provided field separator
|
|
*/
|
|
Datum
|
|
text_to_array(PG_FUNCTION_ARGS)
|
|
{
|
|
text *inputstring = PG_GETARG_TEXT_P(0);
|
|
text *fldsep = PG_GETARG_TEXT_P(1);
|
|
int inputstring_len = TEXTLEN(inputstring);
|
|
int fldsep_len = TEXTLEN(fldsep);
|
|
int fldnum;
|
|
int start_posn;
|
|
int end_posn;
|
|
text *result_text;
|
|
ArrayBuildState *astate = NULL;
|
|
|
|
/* return NULL for empty input string */
|
|
if (inputstring_len < 1)
|
|
PG_RETURN_NULL();
|
|
|
|
/*
|
|
* empty field separator return one element, 1D, array using the input
|
|
* string
|
|
*/
|
|
if (fldsep_len < 1)
|
|
PG_RETURN_ARRAYTYPE_P(create_singleton_array(fcinfo, TEXTOID,
|
|
CStringGetDatum(inputstring), 1));
|
|
|
|
/* start with end position holding the initial start position */
|
|
end_posn = 0;
|
|
for (fldnum = 1;; fldnum++) /* field number is 1 based */
|
|
{
|
|
Datum dvalue;
|
|
bool disnull = false;
|
|
|
|
start_posn = end_posn;
|
|
end_posn = text_position(inputstring, fldsep, fldnum);
|
|
|
|
if ((start_posn == 0) && (end_posn == 0)) /* fldsep not found */
|
|
{
|
|
if (fldnum == 1)
|
|
{
|
|
/*
|
|
* first element return one element, 1D, array using the
|
|
* input string
|
|
*/
|
|
PG_RETURN_ARRAYTYPE_P(create_singleton_array(fcinfo, TEXTOID,
|
|
CStringGetDatum(inputstring), 1));
|
|
}
|
|
else
|
|
{
|
|
/* otherwise create array and exit */
|
|
PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate,
|
|
CurrentMemoryContext));
|
|
}
|
|
}
|
|
else if (start_posn == 0)
|
|
{
|
|
/* first field requested */
|
|
result_text = LEFT(inputstring, fldsep);
|
|
}
|
|
else if (end_posn == 0)
|
|
{
|
|
/* last field requested */
|
|
result_text = text_substring(PointerGetDatum(inputstring),
|
|
start_posn + fldsep_len,
|
|
-1, true);
|
|
}
|
|
else
|
|
{
|
|
/* interior field requested */
|
|
result_text = text_substring(PointerGetDatum(inputstring),
|
|
start_posn + fldsep_len,
|
|
end_posn - start_posn - fldsep_len,
|
|
false);
|
|
}
|
|
|
|
/* stash away current value */
|
|
dvalue = PointerGetDatum(result_text);
|
|
astate = accumArrayResult(astate, dvalue,
|
|
disnull, TEXTOID,
|
|
CurrentMemoryContext);
|
|
}
|
|
|
|
/* never reached -- keep compiler quiet */
|
|
PG_RETURN_NULL();
|
|
}
|
|
|
|
/*
|
|
* array_to_text
|
|
* concatenate Cstring representation of input array elements
|
|
* using provided field separator
|
|
*/
|
|
Datum
|
|
array_to_text(PG_FUNCTION_ARGS)
|
|
{
|
|
ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
|
|
char *fldsep = PG_TEXTARG_GET_STR(1);
|
|
int nitems,
|
|
*dims,
|
|
ndims;
|
|
char *p;
|
|
Oid element_type;
|
|
int typlen;
|
|
bool typbyval;
|
|
char typalign;
|
|
StringInfo result_str = makeStringInfo();
|
|
int i;
|
|
ArrayMetaState *my_extra;
|
|
|
|
p = ARR_DATA_PTR(v);
|
|
ndims = ARR_NDIM(v);
|
|
dims = ARR_DIMS(v);
|
|
nitems = ArrayGetNItems(ndims, dims);
|
|
|
|
/* if there are no elements, return an empty string */
|
|
if (nitems == 0)
|
|
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
|
|
|
|
element_type = ARR_ELEMTYPE(v);
|
|
|
|
/*
|
|
* We arrange to look up info about element type, including its output
|
|
* conversion proc, only once per series of calls, assuming the
|
|
* element type doesn't change underneath us.
|
|
*/
|
|
my_extra = (ArrayMetaState *) fcinfo->flinfo->fn_extra;
|
|
if (my_extra == NULL)
|
|
{
|
|
fcinfo->flinfo->fn_extra = MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
|
|
sizeof(ArrayMetaState));
|
|
my_extra = (ArrayMetaState *) fcinfo->flinfo->fn_extra;
|
|
my_extra->element_type = InvalidOid;
|
|
}
|
|
|
|
if (my_extra->element_type != element_type)
|
|
{
|
|
/*
|
|
* Get info about element type, including its output conversion
|
|
* proc
|
|
*/
|
|
get_type_io_data(element_type, IOFunc_output,
|
|
&my_extra->typlen, &my_extra->typbyval,
|
|
&my_extra->typalign, &my_extra->typdelim,
|
|
&my_extra->typioparam, &my_extra->typiofunc);
|
|
fmgr_info_cxt(my_extra->typiofunc, &my_extra->proc,
|
|
fcinfo->flinfo->fn_mcxt);
|
|
my_extra->element_type = element_type;
|
|
}
|
|
typlen = my_extra->typlen;
|
|
typbyval = my_extra->typbyval;
|
|
typalign = my_extra->typalign;
|
|
|
|
for (i = 0; i < nitems; i++)
|
|
{
|
|
Datum itemvalue;
|
|
char *value;
|
|
|
|
itemvalue = fetch_att(p, typbyval, typlen);
|
|
|
|
value = DatumGetCString(FunctionCall1(&my_extra->proc,
|
|
itemvalue));
|
|
|
|
if (i > 0)
|
|
appendStringInfo(result_str, "%s%s", fldsep, value);
|
|
else
|
|
appendStringInfoString(result_str, value);
|
|
|
|
p = att_addlength(p, typlen, PointerGetDatum(p));
|
|
p = (char *) att_align(p, typalign);
|
|
}
|
|
|
|
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(result_str->data));
|
|
}
|
|
|
|
#define HEXBASE 16
|
|
/*
|
|
* Convert a int32 to a string containing a base 16 (hex) representation of
|
|
* the number.
|
|
*/
|
|
Datum
|
|
to_hex32(PG_FUNCTION_ARGS)
|
|
{
|
|
uint32 value = (uint32) PG_GETARG_INT32(0);
|
|
text *result_text;
|
|
char *ptr;
|
|
const char *digits = "0123456789abcdef";
|
|
char buf[32]; /* bigger than needed, but reasonable */
|
|
|
|
ptr = buf + sizeof(buf) - 1;
|
|
*ptr = '\0';
|
|
|
|
do
|
|
{
|
|
*--ptr = digits[value % HEXBASE];
|
|
value /= HEXBASE;
|
|
} while (ptr > buf && value);
|
|
|
|
result_text = PG_STR_GET_TEXT(ptr);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
|
|
/*
|
|
* Convert a int64 to a string containing a base 16 (hex) representation of
|
|
* the number.
|
|
*/
|
|
Datum
|
|
to_hex64(PG_FUNCTION_ARGS)
|
|
{
|
|
uint64 value = (uint64) PG_GETARG_INT64(0);
|
|
text *result_text;
|
|
char *ptr;
|
|
const char *digits = "0123456789abcdef";
|
|
char buf[32]; /* bigger than needed, but reasonable */
|
|
|
|
ptr = buf + sizeof(buf) - 1;
|
|
*ptr = '\0';
|
|
|
|
do
|
|
{
|
|
*--ptr = digits[value % HEXBASE];
|
|
value /= HEXBASE;
|
|
} while (ptr > buf && value);
|
|
|
|
result_text = PG_STR_GET_TEXT(ptr);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
|
|
/*
|
|
* Create an md5 hash of a text string and return it as hex
|
|
*
|
|
* md5 produces a 16 byte (128 bit) hash; double it for hex
|
|
*/
|
|
#define MD5_HASH_LEN 32
|
|
|
|
Datum
|
|
md5_text(PG_FUNCTION_ARGS)
|
|
{
|
|
text *in_text = PG_GETARG_TEXT_P(0);
|
|
size_t len;
|
|
char hexsum[MD5_HASH_LEN + 1];
|
|
text *result_text;
|
|
|
|
/* Calculate the length of the buffer using varlena metadata */
|
|
len = VARSIZE(in_text) - VARHDRSZ;
|
|
|
|
/* get the hash result */
|
|
if (md5_hash(VARDATA(in_text), len, hexsum) == false)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OUT_OF_MEMORY),
|
|
errmsg("out of memory")));
|
|
|
|
/* convert to text and return it */
|
|
result_text = PG_STR_GET_TEXT(hexsum);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|
|
|
|
/*
|
|
* Create an md5 hash of a bytea field and return it as a hex string:
|
|
* 16-byte md5 digest is represented in 32 hex characters.
|
|
*/
|
|
Datum
|
|
md5_bytea(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *in = PG_GETARG_BYTEA_P(0);
|
|
size_t len;
|
|
char hexsum[MD5_HASH_LEN + 1];
|
|
text *result_text;
|
|
|
|
len = VARSIZE(in) - VARHDRSZ;
|
|
if (md5_hash(VARDATA(in), len, hexsum) == false)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OUT_OF_MEMORY),
|
|
errmsg("out of memory")));
|
|
|
|
result_text = PG_STR_GET_TEXT(hexsum);
|
|
PG_RETURN_TEXT_P(result_text);
|
|
}
|