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5cabcfccce
array header, and to compute sizing and alignment of array elements the same way normal tuple access operations do --- viz, using the tupmacs.h macros att_addlength and att_align. This makes the world safe for arrays of cstrings or intervals, and should make it much easier to write array-type-polymorphic functions; as examples see the cleanups of array_out and contrib/array_iterator. By Joe Conway and Tom Lane.
976 lines
21 KiB
C
976 lines
21 KiB
C
/*-------------------------------------------------------------------------
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*
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* varchar.c
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* Functions for the built-in types char(n) and varchar(n).
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*
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* Portions Copyright (c) 1996-2002, 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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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.91 2002/08/26 17:53:59 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 "access/hash.h"
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#include "catalog/pg_type.h"
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#include "miscadmin.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#ifdef MULTIBYTE
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#include "mb/pg_wchar.h"
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#endif
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/*
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* CHAR() and VARCHAR() types are part of the ANSI SQL standard. CHAR()
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* is for blank-padded string whose length is specified in CREATE TABLE.
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* VARCHAR is for storing string whose length is at most the length specified
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* at CREATE TABLE time.
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*
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* It's hard to implement these types because we cannot figure out
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* the length of the type from the type itself. I changed (hopefully all) the
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* fmgr calls that invoke input functions of a data type to supply the
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* length also. (eg. in INSERTs, we have the tupleDescriptor which contains
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* the length of the attributes and hence the exact length of the char() or
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* varchar(). We pass this to bpcharin() or varcharin().) In the case where
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* we cannot determine the length, we pass in -1 instead and the input string
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* must be null-terminated.
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*
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* We actually implement this as a varlena so that we don't have to pass in
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* the length for the comparison functions. (The difference between these
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* types and "text" is that we truncate and possibly blank-pad the string
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* at insertion time.)
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*
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* - ay 6/95
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*/
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/*****************************************************************************
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* bpchar - char() *
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*****************************************************************************/
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/*
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* Convert a C string to CHARACTER internal representation. atttypmod
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* is the declared length of the type plus VARHDRSZ.
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*
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* If the C string is too long, raise an error, unless the extra
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* characters are spaces, in which case they're truncated. (per SQL)
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*/
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Datum
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bpcharin(PG_FUNCTION_ARGS)
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{
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char *s = PG_GETARG_CSTRING(0);
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#ifdef NOT_USED
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Oid typelem = PG_GETARG_OID(1);
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#endif
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int32 atttypmod = PG_GETARG_INT32(2);
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BpChar *result;
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char *r;
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size_t len,
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maxlen;
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int i;
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#ifdef MULTIBYTE
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int charlen; /* number of charcters in the input string */
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char *ermsg;
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#endif
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len = strlen(s);
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#ifdef MULTIBYTE
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if ((ermsg = pg_verifymbstr(s, len)))
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elog(ERROR, "%s", ermsg);
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charlen = pg_mbstrlen(s);
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#endif
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/* If typmod is -1 (or invalid), use the actual string length */
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if (atttypmod < (int32) VARHDRSZ)
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#ifdef MULTIBYTE
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maxlen = charlen;
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#else
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maxlen = len;
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#endif
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else
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maxlen = atttypmod - VARHDRSZ;
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#ifdef MULTIBYTE
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if (charlen > maxlen)
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#else
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if (len > maxlen)
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#endif
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
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/*
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* at this point, len is the actual BYTE length of the input
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* string, maxlen is the max number of CHARACTERS allowed for this
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* bpchar type.
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*/
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if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
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len = mbmaxlen;
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else
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elog(ERROR, "value too long for type character(%d)",
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(int) maxlen);
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/*
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* XXX: at this point, maxlen is the necessary byte length, not
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* the number of CHARACTERS!
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*/
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maxlen = len;
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#else
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if (strspn(s + maxlen, " ") == len - maxlen)
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len = maxlen;
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else
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elog(ERROR, "value too long for type character(%d)",
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(int) maxlen);
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#endif
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}
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#ifdef MULTIBYTE
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else
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{
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/*
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* XXX: at this point, maxlen is the necessary byte length, not
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* the number of CHARACTERS!
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*/
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maxlen = len + (maxlen - charlen);
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}
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#endif
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result = palloc(maxlen + VARHDRSZ);
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VARATT_SIZEP(result) = maxlen + VARHDRSZ;
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r = VARDATA(result);
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for (i = 0; i < len; i++)
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*r++ = *s++;
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/* blank pad the string if necessary */
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for (; i < maxlen; i++)
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*r++ = ' ';
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#ifdef CYR_RECODE
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convertstr(VARDATA(result), len, 0);
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#endif
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PG_RETURN_BPCHAR_P(result);
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}
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/*
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* Convert a CHARACTER value to a C string.
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*/
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Datum
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bpcharout(PG_FUNCTION_ARGS)
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{
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BpChar *s = PG_GETARG_BPCHAR_P(0);
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char *result;
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int len;
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/* copy and add null term */
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len = VARSIZE(s) - VARHDRSZ;
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result = (char *) palloc(len + 1);
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memcpy(result, VARDATA(s), len);
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result[len] = '\0';
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#ifdef CYR_RECODE
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convertstr(result, len, 1);
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#endif
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PG_RETURN_CSTRING(result);
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}
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/*
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* Converts a CHARACTER type to the specified size. maxlen is the new
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* declared length plus VARHDRSZ bytes. Truncation
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* rules see bpcharin() above.
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*/
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Datum
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bpchar(PG_FUNCTION_ARGS)
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{
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BpChar *source = PG_GETARG_BPCHAR_P(0);
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int32 maxlen = PG_GETARG_INT32(1);
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BpChar *result;
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int32 len;
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char *r;
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char *s;
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int i;
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#ifdef MULTIBYTE
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int charlen; /* number of charcters in the input string
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* + VARHDRSZ */
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#endif
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len = VARSIZE(source);
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#ifdef MULTIBYTE
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charlen = pg_mbstrlen_with_len(VARDATA(source), len - VARHDRSZ) + VARHDRSZ;
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#endif
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/* No work if typmod is invalid or supplied data matches it already */
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if (maxlen < (int32) VARHDRSZ || len == maxlen)
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PG_RETURN_BPCHAR_P(source);
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#ifdef MULTIBYTE
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if (charlen > maxlen)
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#else
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if (len > maxlen)
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#endif
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t maxmblen;
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maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
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maxlen - VARHDRSZ) + VARHDRSZ;
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for (i = maxmblen - VARHDRSZ; i < len - VARHDRSZ; i++)
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if (*(VARDATA(source) + i) != ' ')
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elog(ERROR, "value too long for type character(%d)",
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maxlen - VARHDRSZ);
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len = maxmblen;
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length+VARHDRSZ, not the number of CHARACTERS!
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*/
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maxlen = len;
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#else
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for (i = maxlen - VARHDRSZ; i < len - VARHDRSZ; i++)
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if (*(VARDATA(source) + i) != ' ')
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elog(ERROR, "value too long for type character(%d)",
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maxlen - VARHDRSZ);
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len = maxlen;
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#endif
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}
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#ifdef MULTIBYTE
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else
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{
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/*
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* XXX: at this point, maxlen is the necessary byte
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* length+VARHDRSZ, not the number of CHARACTERS!
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*/
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maxlen = len + (maxlen - charlen);
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}
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#endif
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s = VARDATA(source);
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result = palloc(maxlen);
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VARATT_SIZEP(result) = maxlen;
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r = VARDATA(result);
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for (i = 0; i < len - VARHDRSZ; i++)
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*r++ = *s++;
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/* blank pad the string if necessary */
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for (; i < maxlen - VARHDRSZ; i++)
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*r++ = ' ';
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PG_RETURN_BPCHAR_P(result);
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}
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/* _bpchar()
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* Converts an array of char() elements to a specific internal length.
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* len is the length specified in () plus VARHDRSZ bytes.
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*/
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Datum
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_bpchar(PG_FUNCTION_ARGS)
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{
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ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
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int32 len = PG_GETARG_INT32(1);
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FunctionCallInfoData locfcinfo;
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/*
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* Since bpchar() is a built-in function, we should only need to look
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* it up once per run.
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*/
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static FmgrInfo bpchar_finfo;
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if (bpchar_finfo.fn_oid == InvalidOid)
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fmgr_info_cxt(F_BPCHAR, &bpchar_finfo, TopMemoryContext);
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MemSet(&locfcinfo, 0, sizeof(locfcinfo));
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locfcinfo.flinfo = &bpchar_finfo;
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locfcinfo.nargs = 2;
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/* We assume we are "strict" and need not worry about null inputs */
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locfcinfo.arg[0] = PointerGetDatum(v);
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locfcinfo.arg[1] = Int32GetDatum(len);
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return array_map(&locfcinfo, BPCHAROID, BPCHAROID);
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}
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/* char_bpchar()
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* Convert char to bpchar(1).
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*/
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Datum
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char_bpchar(PG_FUNCTION_ARGS)
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{
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char c = PG_GETARG_CHAR(0);
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BpChar *result;
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result = (BpChar *) palloc(VARHDRSZ + 1);
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VARATT_SIZEP(result) = VARHDRSZ + 1;
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*(VARDATA(result)) = c;
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PG_RETURN_BPCHAR_P(result);
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}
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/* bpchar_name()
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* Converts a bpchar() type to a NameData type.
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*/
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Datum
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bpchar_name(PG_FUNCTION_ARGS)
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{
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BpChar *s = PG_GETARG_BPCHAR_P(0);
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Name result;
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int len;
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len = VARSIZE(s) - VARHDRSZ;
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/* Truncate to max length for a Name */
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if (len >= NAMEDATALEN)
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len = NAMEDATALEN - 1;
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/* Remove trailing blanks */
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while (len > 0)
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{
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if (*(VARDATA(s) + len - 1) != ' ')
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break;
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len--;
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}
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result = (NameData *) palloc(NAMEDATALEN);
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memcpy(NameStr(*result), VARDATA(s), len);
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/* Now null pad to full length... */
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while (len < NAMEDATALEN)
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{
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*(NameStr(*result) + len) = '\0';
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len++;
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}
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PG_RETURN_NAME(result);
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}
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/* name_bpchar()
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* Converts a NameData type to a bpchar type.
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*/
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Datum
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name_bpchar(PG_FUNCTION_ARGS)
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{
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Name s = PG_GETARG_NAME(0);
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BpChar *result;
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int len;
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len = strlen(NameStr(*s));
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result = (BpChar *) palloc(VARHDRSZ + len);
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memcpy(VARDATA(result), NameStr(*s), len);
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VARATT_SIZEP(result) = len + VARHDRSZ;
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PG_RETURN_BPCHAR_P(result);
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}
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/*****************************************************************************
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* varchar - varchar() *
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*****************************************************************************/
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/*
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* Convert a C string to VARCHAR internal representation. atttypmod
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* is the declared length of the type plus VARHDRSZ.
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*
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* Note that if MULTIBYTE is enabled, atttypmod is regarded as the
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* number of characters, rather than number of bytes.
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*
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* If the C string is too long,
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* raise an error, unless the extra characters are spaces, in which
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* case they're truncated. (per SQL) */
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Datum
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varcharin(PG_FUNCTION_ARGS)
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{
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char *s = PG_GETARG_CSTRING(0);
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#ifdef NOT_USED
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Oid typelem = PG_GETARG_OID(1);
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#endif
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int32 atttypmod = PG_GETARG_INT32(2);
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VarChar *result;
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size_t len,
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maxlen;
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#ifdef MULTIBYTE
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char *ermsg;
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#endif
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len = strlen(s);
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#ifdef MULTIBYTE
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if ((ermsg = pg_verifymbstr(s, len)))
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elog(ERROR, "%s", ermsg);
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#endif
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maxlen = atttypmod - VARHDRSZ;
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if (atttypmod >= (int32) VARHDRSZ && len > maxlen)
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{
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/* Verify that extra characters are spaces, and clip them off */
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#ifdef MULTIBYTE
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size_t mbmaxlen = pg_mbcharcliplen(s, len, maxlen);
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if (strspn(s + mbmaxlen, " ") == len - mbmaxlen)
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len = mbmaxlen;
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#else
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if (strspn(s + maxlen, " ") == len - maxlen)
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len = maxlen;
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#endif
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else
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elog(ERROR, "value too long for type character varying(%d)",
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(int) maxlen);
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}
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result = palloc(len + VARHDRSZ);
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VARATT_SIZEP(result) = len + VARHDRSZ;
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memcpy(VARDATA(result), s, len);
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#ifdef CYR_RECODE
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convertstr(VARDATA(result), len, 0);
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#endif
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PG_RETURN_VARCHAR_P(result);
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}
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/*
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* Convert a VARCHAR value to a C string.
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*/
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Datum
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varcharout(PG_FUNCTION_ARGS)
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{
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VarChar *s = PG_GETARG_VARCHAR_P(0);
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char *result;
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int32 len;
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/* copy and add null term */
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len = VARSIZE(s) - VARHDRSZ;
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result = palloc(len + 1);
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memcpy(result, VARDATA(s), len);
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result[len] = '\0';
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#ifdef CYR_RECODE
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convertstr(result, len, 1);
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#endif
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PG_RETURN_CSTRING(result);
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}
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|
|
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/*
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* Converts a VARCHAR type to the specified size. maxlen is the new
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* declared length plus VARHDRSZ bytes. Truncation
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* rules see varcharin() above.
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*/
|
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Datum
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varchar(PG_FUNCTION_ARGS)
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{
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VarChar *source = PG_GETARG_VARCHAR_P(0);
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int32 maxlen = PG_GETARG_INT32(1);
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VarChar *result;
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int32 len;
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int i;
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len = VARSIZE(source);
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/* No work if typmod is invalid or supplied data fits it already */
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if (maxlen < (int32) VARHDRSZ || len <= maxlen)
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PG_RETURN_VARCHAR_P(source);
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/* only reach here if string is too long... */
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#ifdef MULTIBYTE
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{
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size_t maxmblen;
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/* truncate multi-byte string preserving multi-byte boundary */
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maxmblen = pg_mbcharcliplen(VARDATA(source), len - VARHDRSZ,
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maxlen - VARHDRSZ) + VARHDRSZ;
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for (i = maxmblen - VARHDRSZ; i < len - VARHDRSZ; i++)
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if (*(VARDATA(source) + i) != ' ')
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elog(ERROR, "value too long for type character varying(%d)",
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maxlen - VARHDRSZ);
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len = maxmblen;
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}
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#else
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for (i = maxlen - VARHDRSZ; i < len - VARHDRSZ; i++)
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if (*(VARDATA(source) + i) != ' ')
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elog(ERROR, "value too long for type character varying(%d)",
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maxlen - VARHDRSZ);
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/* clip extra spaces */
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len = maxlen;
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#endif
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result = palloc(len);
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VARATT_SIZEP(result) = len;
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memcpy(VARDATA(result), VARDATA(source), len - VARHDRSZ);
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PG_RETURN_VARCHAR_P(result);
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}
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|
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/* _varchar()
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* Converts an array of varchar() elements to the specified size.
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* len is the length specified in () plus VARHDRSZ bytes.
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*/
|
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Datum
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_varchar(PG_FUNCTION_ARGS)
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{
|
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ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
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int32 len = PG_GETARG_INT32(1);
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FunctionCallInfoData locfcinfo;
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|
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/*
|
|
* Since varchar() is a built-in function, we should only need to look
|
|
* it up once per run.
|
|
*/
|
|
static FmgrInfo varchar_finfo;
|
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|
|
if (varchar_finfo.fn_oid == InvalidOid)
|
|
fmgr_info_cxt(F_VARCHAR, &varchar_finfo, TopMemoryContext);
|
|
|
|
MemSet(&locfcinfo, 0, sizeof(locfcinfo));
|
|
locfcinfo.flinfo = &varchar_finfo;
|
|
locfcinfo.nargs = 2;
|
|
/* We assume we are "strict" and need not worry about null inputs */
|
|
locfcinfo.arg[0] = PointerGetDatum(v);
|
|
locfcinfo.arg[1] = Int32GetDatum(len);
|
|
|
|
return array_map(&locfcinfo, VARCHAROID, VARCHAROID);
|
|
}
|
|
|
|
|
|
|
|
/*****************************************************************************
|
|
* Exported functions
|
|
*****************************************************************************/
|
|
|
|
/* "True" length (not counting trailing blanks) of a BpChar */
|
|
static int
|
|
bcTruelen(BpChar *arg)
|
|
{
|
|
char *s = VARDATA(arg);
|
|
int i;
|
|
int len;
|
|
|
|
len = VARSIZE(arg) - VARHDRSZ;
|
|
for (i = len - 1; i >= 0; i--)
|
|
{
|
|
if (s[i] != ' ')
|
|
break;
|
|
}
|
|
return i + 1;
|
|
}
|
|
|
|
Datum
|
|
bpcharlen(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg = PG_GETARG_BPCHAR_P(0);
|
|
|
|
#ifdef MULTIBYTE
|
|
/* optimization for single byte encoding */
|
|
if (pg_database_encoding_max_length() <= 1)
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
|
|
PG_RETURN_INT32(
|
|
pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
|
|
);
|
|
#else
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
#endif
|
|
}
|
|
|
|
Datum
|
|
bpcharoctetlen(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg = PG_GETARG_BPCHAR_P(0);
|
|
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Comparison Functions used for bpchar
|
|
*
|
|
* 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
|
|
bpchareq(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = false;
|
|
else
|
|
result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) == 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bpcharne(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
bool result;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
/* fast path for different-length inputs */
|
|
if (len1 != len2)
|
|
result = true;
|
|
else
|
|
result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
bpcharlt(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp < 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharle(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp <= 0);
|
|
}
|
|
|
|
Datum
|
|
bpchargt(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp > 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharge(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp >= 0);
|
|
}
|
|
|
|
Datum
|
|
bpcharcmp(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
|
|
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = bcTruelen(arg1);
|
|
len2 = bcTruelen(arg2);
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(cmp);
|
|
}
|
|
|
|
|
|
/*
|
|
* bpchar needs a specialized hash function because we want to ignore
|
|
* trailing blanks in comparisons. (varchar can use plain hashvarlena.)
|
|
*/
|
|
Datum
|
|
hashbpchar(PG_FUNCTION_ARGS)
|
|
{
|
|
BpChar *key = PG_GETARG_BPCHAR_P(0);
|
|
char *keydata;
|
|
int keylen;
|
|
Datum result;
|
|
|
|
keydata = VARDATA(key);
|
|
keylen = bcTruelen(key);
|
|
|
|
result = hash_any((unsigned char *) keydata, keylen);
|
|
|
|
/* Avoid leaking memory for toasted inputs */
|
|
PG_FREE_IF_COPY(key, 0);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Functions used for varchar
|
|
*****************************************************************************/
|
|
|
|
Datum
|
|
varcharlen(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg = PG_GETARG_VARCHAR_P(0);
|
|
|
|
#ifdef MULTIBYTE
|
|
/* optimization for single byte encoding */
|
|
if (pg_database_encoding_max_length() <= 1)
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
|
|
PG_RETURN_INT32(
|
|
pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
|
|
);
|
|
#else
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
#endif
|
|
}
|
|
|
|
Datum
|
|
varcharoctetlen(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg = PG_GETARG_VARCHAR_P(0);
|
|
|
|
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* Comparison Functions used for varchar
|
|
*
|
|
* 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
|
|
varchareq(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_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 = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) == 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
varcharne(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_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 = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
Datum
|
|
varcharlt(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp < 0);
|
|
}
|
|
|
|
Datum
|
|
varcharle(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp <= 0);
|
|
}
|
|
|
|
Datum
|
|
varchargt(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp > 0);
|
|
}
|
|
|
|
Datum
|
|
varcharge(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_BOOL(cmp >= 0);
|
|
}
|
|
|
|
Datum
|
|
varcharcmp(PG_FUNCTION_ARGS)
|
|
{
|
|
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
|
|
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
|
|
int len1,
|
|
len2;
|
|
int cmp;
|
|
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
len2 = VARSIZE(arg2) - VARHDRSZ;
|
|
|
|
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
|
|
|
|
PG_FREE_IF_COPY(arg1, 0);
|
|
PG_FREE_IF_COPY(arg2, 1);
|
|
|
|
PG_RETURN_INT32(cmp);
|
|
}
|