11d5c82002
single-byte encodings, and a direct C implementation of the single-argument forms (where spaces are always what gets trimmed). This is in preparation for using rtrim1() as the bpchar-to-text cast operator, but is a useful performance improvement even if we decide not to do that.
934 lines
18 KiB
C
934 lines
18 KiB
C
/*-------------------------------------------------------------------------
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* oracle_compat.c
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* Oracle compatible functions.
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*
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* Copyright (c) 1996-2003, PostgreSQL Global Development Group
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*
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* Author: Edmund Mergl <E.Mergl@bawue.de>
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* Multibyte enhancement: Tatsuo Ishii <ishii@postgresql.org>
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/oracle_compat.c,v 1.44 2003/05/23 22:33:20 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 "utils/builtins.h"
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#include "mb/pg_wchar.h"
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static text *dotrim(const char *string, int stringlen,
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const char *set, int setlen,
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bool doltrim, bool dortrim);
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/********************************************************************
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*
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* lower
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*
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* Syntax:
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*
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* text lower(text string)
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*
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* Purpose:
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*
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* Returns string, with all letters forced to lowercase.
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*
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********************************************************************/
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Datum
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lower(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P_COPY(0);
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char *ptr;
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int m;
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/* Since we copied the string, we can scribble directly on the value */
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ptr = VARDATA(string);
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m = VARSIZE(string) - VARHDRSZ;
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while (m-- > 0)
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{
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*ptr = tolower((unsigned char) *ptr);
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ptr++;
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}
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PG_RETURN_TEXT_P(string);
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}
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/********************************************************************
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*
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* upper
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*
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* Syntax:
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*
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* text upper(text string)
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*
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* Purpose:
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*
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* Returns string, with all letters forced to uppercase.
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*
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********************************************************************/
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Datum
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upper(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P_COPY(0);
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char *ptr;
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int m;
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/* Since we copied the string, we can scribble directly on the value */
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ptr = VARDATA(string);
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m = VARSIZE(string) - VARHDRSZ;
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while (m-- > 0)
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{
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*ptr = toupper((unsigned char) *ptr);
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ptr++;
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}
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PG_RETURN_TEXT_P(string);
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}
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/********************************************************************
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*
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* initcap
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*
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* Syntax:
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*
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* text initcap(text string)
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*
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* Purpose:
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*
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* Returns string, with first letter of each word in uppercase,
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* all other letters in lowercase. A word is delimited by white
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* space.
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*
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********************************************************************/
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Datum
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initcap(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P_COPY(0);
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char *ptr;
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int m;
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/* Since we copied the string, we can scribble directly on the value */
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ptr = VARDATA(string);
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m = VARSIZE(string) - VARHDRSZ;
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if (m > 0)
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{
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*ptr = toupper((unsigned char) *ptr);
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ptr++;
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m--;
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}
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while (m-- > 0)
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{
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if (isspace((unsigned char) ptr[-1]))
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*ptr = toupper((unsigned char) *ptr);
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else
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*ptr = tolower((unsigned char) *ptr);
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ptr++;
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}
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PG_RETURN_TEXT_P(string);
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}
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/********************************************************************
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*
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* lpad
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*
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* Syntax:
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*
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* text lpad(text string1, int4 len, text string2)
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*
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* Purpose:
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*
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* Returns string1, left-padded to length len with the sequence of
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* characters in string2. If len is less than the length of string1,
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* instead truncate (on the right) to len.
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*
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********************************************************************/
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Datum
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lpad(PG_FUNCTION_ARGS)
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{
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text *string1 = PG_GETARG_TEXT_P(0);
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int32 len = PG_GETARG_INT32(1);
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text *string2 = PG_GETARG_TEXT_P(2);
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text *ret;
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char *ptr1,
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*ptr2,
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*ptr2end,
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*ptr_ret;
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int m,
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s1len,
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s2len;
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int bytelen;
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/* Negative len is silently taken as zero */
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if (len < 0)
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len = 0;
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s1len = VARSIZE(string1) - VARHDRSZ;
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if (s1len < 0)
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s1len = 0; /* shouldn't happen */
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s2len = VARSIZE(string2) - VARHDRSZ;
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if (s2len < 0)
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s2len = 0; /* shouldn't happen */
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s1len = pg_mbstrlen_with_len(VARDATA(string1), s1len);
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if (s1len > len)
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s1len = len; /* truncate string1 to len chars */
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if (s2len <= 0)
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len = s1len; /* nothing to pad with, so don't pad */
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bytelen = pg_database_encoding_max_length() * len;
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/* check for integer overflow */
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if (len != 0 && bytelen / pg_database_encoding_max_length() != len)
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elog(ERROR, "Requested length too large");
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ret = (text *) palloc(VARHDRSZ + bytelen);
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m = len - s1len;
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ptr2 = VARDATA(string2);
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ptr2end = ptr2 + s2len;
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ptr_ret = VARDATA(ret);
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while (m--)
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{
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int mlen = pg_mblen(ptr2);
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memcpy(ptr_ret, ptr2, mlen);
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ptr_ret += mlen;
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ptr2 += mlen;
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if (ptr2 == ptr2end) /* wrap around at end of s2 */
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ptr2 = VARDATA(string2);
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}
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ptr1 = VARDATA(string1);
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while (s1len--)
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{
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int mlen = pg_mblen(ptr1);
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memcpy(ptr_ret, ptr1, mlen);
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ptr_ret += mlen;
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ptr1 += mlen;
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}
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VARATT_SIZEP(ret) = ptr_ret - (char *) ret;
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PG_RETURN_TEXT_P(ret);
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}
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/********************************************************************
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*
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* rpad
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*
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* Syntax:
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*
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* text rpad(text string1, int4 len, text string2)
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*
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* Purpose:
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*
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* Returns string1, right-padded to length len with the sequence of
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* characters in string2. If len is less than the length of string1,
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* instead truncate (on the right) to len.
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*
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********************************************************************/
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Datum
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rpad(PG_FUNCTION_ARGS)
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{
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text *string1 = PG_GETARG_TEXT_P(0);
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int32 len = PG_GETARG_INT32(1);
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text *string2 = PG_GETARG_TEXT_P(2);
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text *ret;
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char *ptr1,
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*ptr2,
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*ptr2end,
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*ptr_ret;
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int m,
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s1len,
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s2len;
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int bytelen;
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/* Negative len is silently taken as zero */
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if (len < 0)
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len = 0;
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s1len = VARSIZE(string1) - VARHDRSZ;
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if (s1len < 0)
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s1len = 0; /* shouldn't happen */
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s2len = VARSIZE(string2) - VARHDRSZ;
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if (s2len < 0)
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s2len = 0; /* shouldn't happen */
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s1len = pg_mbstrlen_with_len(VARDATA(string1), s1len);
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if (s1len > len)
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s1len = len; /* truncate string1 to len chars */
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if (s2len <= 0)
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len = s1len; /* nothing to pad with, so don't pad */
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bytelen = pg_database_encoding_max_length() * len;
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/* Check for integer overflow */
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if (len != 0 && bytelen / pg_database_encoding_max_length() != len)
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elog(ERROR, "Requested length too large");
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ret = (text *) palloc(VARHDRSZ + bytelen);
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m = len - s1len;
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ptr1 = VARDATA(string1);
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ptr_ret = VARDATA(ret);
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while (s1len--)
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{
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int mlen = pg_mblen(ptr1);
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memcpy(ptr_ret, ptr1, mlen);
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ptr_ret += mlen;
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ptr1 += mlen;
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}
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ptr2 = VARDATA(string2);
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ptr2end = ptr2 + s2len;
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while (m--)
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{
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int mlen = pg_mblen(ptr2);
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memcpy(ptr_ret, ptr2, mlen);
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ptr_ret += mlen;
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ptr2 += mlen;
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if (ptr2 == ptr2end) /* wrap around at end of s2 */
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ptr2 = VARDATA(string2);
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}
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VARATT_SIZEP(ret) = ptr_ret - (char *) ret;
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PG_RETURN_TEXT_P(ret);
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}
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/********************************************************************
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*
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* btrim
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*
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* Syntax:
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*
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* text btrim(text string, text set)
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*
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* Purpose:
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*
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* Returns string with characters removed from the front and back
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* up to the first character not in set.
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*
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********************************************************************/
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Datum
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btrim(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P(0);
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text *set = PG_GETARG_TEXT_P(1);
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text *ret;
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ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
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VARDATA(set), VARSIZE(set) - VARHDRSZ,
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true, true);
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PG_RETURN_TEXT_P(ret);
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}
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/********************************************************************
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*
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* btrim1 --- btrim with set fixed as ' '
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*
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********************************************************************/
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Datum
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btrim1(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P(0);
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text *ret;
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ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
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" ", 1,
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true, true);
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PG_RETURN_TEXT_P(ret);
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}
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/*
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* Common implementation for btrim, ltrim, rtrim
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*/
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static text *
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dotrim(const char *string, int stringlen,
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const char *set, int setlen,
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bool doltrim, bool dortrim)
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{
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text *result;
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int i;
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/* Nothing to do if either string or set is empty */
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if (stringlen > 0 && setlen > 0)
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{
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if (pg_database_encoding_max_length() > 1)
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{
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/*
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* In the multibyte-encoding case, build arrays of pointers to
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* character starts, so that we can avoid inefficient checks in
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* the inner loops.
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*/
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const char **stringchars;
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const char **setchars;
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int *stringmblen;
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int *setmblen;
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int stringnchars;
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int setnchars;
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int resultndx;
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int resultnchars;
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const char *p;
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int len;
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int mblen;
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const char *str_pos;
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int str_len;
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stringchars = (const char **) palloc(stringlen * sizeof(char *));
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stringmblen = (int *) palloc(stringlen * sizeof(int));
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stringnchars = 0;
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p = string;
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len = stringlen;
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while (len > 0)
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{
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stringchars[stringnchars] = p;
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stringmblen[stringnchars] = mblen = pg_mblen(p);
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stringnchars++;
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p += mblen;
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len -= mblen;
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}
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setchars = (const char **) palloc(setlen * sizeof(char *));
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setmblen = (int *) palloc(setlen * sizeof(int));
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setnchars = 0;
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p = set;
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len = setlen;
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while (len > 0)
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{
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setchars[setnchars] = p;
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setmblen[setnchars] = mblen = pg_mblen(p);
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setnchars++;
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p += mblen;
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len -= mblen;
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}
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resultndx = 0; /* index in stringchars[] */
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resultnchars = stringnchars;
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if (doltrim)
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{
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while (resultnchars > 0)
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{
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str_pos = stringchars[resultndx];
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str_len = stringmblen[resultndx];
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for (i = 0; i < setnchars; i++)
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{
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if (str_len == setmblen[i] &&
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memcmp(str_pos, setchars[i], str_len) == 0)
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break;
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}
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if (i >= setnchars)
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break; /* no match here */
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string += str_len;
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stringlen -= str_len;
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resultndx++;
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resultnchars--;
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}
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}
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if (dortrim)
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{
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while (resultnchars > 0)
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{
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str_pos = stringchars[resultndx + resultnchars - 1];
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str_len = stringmblen[resultndx + resultnchars - 1];
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for (i = 0; i < setnchars; i++)
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{
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if (str_len == setmblen[i] &&
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memcmp(str_pos, setchars[i], str_len) == 0)
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break;
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}
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if (i >= setnchars)
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break; /* no match here */
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stringlen -= str_len;
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resultnchars--;
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}
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}
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|
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pfree(stringchars);
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pfree(stringmblen);
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pfree(setchars);
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pfree(setmblen);
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}
|
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else
|
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{
|
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/*
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* In the single-byte-encoding case, we don't need such overhead.
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*/
|
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if (doltrim)
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{
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while (stringlen > 0)
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{
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char str_ch = *string;
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|
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for (i = 0; i < setlen; i++)
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{
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if (str_ch == set[i])
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break;
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}
|
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if (i >= setlen)
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break; /* no match here */
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string++;
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stringlen--;
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}
|
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}
|
|
|
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if (dortrim)
|
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{
|
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while (stringlen > 0)
|
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{
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char str_ch = string[stringlen - 1];
|
|
|
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for (i = 0; i < setlen; i++)
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{
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if (str_ch == set[i])
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break;
|
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}
|
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if (i >= setlen)
|
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break; /* no match here */
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stringlen--;
|
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}
|
|
}
|
|
}
|
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}
|
|
|
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/* Return selected portion of string */
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result = (text *) palloc(VARHDRSZ + stringlen);
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VARATT_SIZEP(result) = VARHDRSZ + stringlen;
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memcpy(VARDATA(result), string, stringlen);
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|
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return result;
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}
|
|
|
|
/********************************************************************
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*
|
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* byteatrim
|
|
*
|
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* Syntax:
|
|
*
|
|
* bytea byteatrim(byta string, bytea set)
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|
*
|
|
* Purpose:
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|
*
|
|
* Returns string with characters removed from the front and back
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|
* up to the first character not in set.
|
|
*
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* Cloned from btrim and modified as required.
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********************************************************************/
|
|
|
|
Datum
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|
byteatrim(PG_FUNCTION_ARGS)
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{
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bytea *string = PG_GETARG_BYTEA_P(0);
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bytea *set = PG_GETARG_BYTEA_P(1);
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bytea *ret;
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char *ptr,
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*end,
|
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*ptr2,
|
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*end2;
|
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int m;
|
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|
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if ((m = VARSIZE(string) - VARHDRSZ) <= 0 ||
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(VARSIZE(set) - VARHDRSZ) <= 0)
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PG_RETURN_BYTEA_P(string);
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|
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ptr = VARDATA(string);
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end = VARDATA(string) + VARSIZE(string) - VARHDRSZ - 1;
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end2 = VARDATA(set) + VARSIZE(set) - VARHDRSZ - 1;
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|
|
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while (m > 0)
|
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{
|
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ptr2 = VARDATA(set);
|
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while (ptr2 <= end2)
|
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{
|
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if (*ptr == *ptr2)
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break;
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++ptr2;
|
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}
|
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if (ptr2 > end2)
|
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break;
|
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ptr++;
|
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m--;
|
|
}
|
|
|
|
while (m > 0)
|
|
{
|
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ptr2 = VARDATA(set);
|
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while (ptr2 <= end2)
|
|
{
|
|
if (*end == *ptr2)
|
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break;
|
|
++ptr2;
|
|
}
|
|
if (ptr2 > end2)
|
|
break;
|
|
end--;
|
|
m--;
|
|
}
|
|
|
|
ret = (bytea *) palloc(VARHDRSZ + m);
|
|
VARATT_SIZEP(ret) = VARHDRSZ + m;
|
|
memcpy(VARDATA(ret), ptr, m);
|
|
|
|
PG_RETURN_BYTEA_P(ret);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* ltrim
|
|
*
|
|
* Syntax:
|
|
*
|
|
* text ltrim(text string, text set)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Returns string with initial characters removed up to the first
|
|
* character not in set.
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
ltrim(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
text *set = PG_GETARG_TEXT_P(1);
|
|
text *ret;
|
|
|
|
ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
|
|
VARDATA(set), VARSIZE(set) - VARHDRSZ,
|
|
true, false);
|
|
|
|
PG_RETURN_TEXT_P(ret);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* ltrim1 --- ltrim with set fixed as ' '
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
ltrim1(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
text *ret;
|
|
|
|
ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
|
|
" ", 1,
|
|
true, false);
|
|
|
|
PG_RETURN_TEXT_P(ret);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* rtrim
|
|
*
|
|
* Syntax:
|
|
*
|
|
* text rtrim(text string, text set)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Returns string with final characters removed after the last
|
|
* character not in set.
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
rtrim(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
text *set = PG_GETARG_TEXT_P(1);
|
|
text *ret;
|
|
|
|
ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
|
|
VARDATA(set), VARSIZE(set) - VARHDRSZ,
|
|
false, true);
|
|
|
|
PG_RETURN_TEXT_P(ret);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* rtrim1 --- rtrim with set fixed as ' '
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
rtrim1(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
text *ret;
|
|
|
|
ret = dotrim(VARDATA(string), VARSIZE(string) - VARHDRSZ,
|
|
" ", 1,
|
|
false, true);
|
|
|
|
PG_RETURN_TEXT_P(ret);
|
|
}
|
|
|
|
|
|
/********************************************************************
|
|
*
|
|
* translate
|
|
*
|
|
* Syntax:
|
|
*
|
|
* text translate(text string, text from, text to)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Returns string after replacing all occurrences of characters in from
|
|
* with the corresponding character in to. If from is longer than to,
|
|
* occurrences of the extra characters in from are deleted.
|
|
* Improved by Edwin Ramirez <ramirez@doc.mssm.edu>.
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
translate(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
text *from = PG_GETARG_TEXT_P(1);
|
|
text *to = PG_GETARG_TEXT_P(2);
|
|
text *result;
|
|
char *from_ptr,
|
|
*to_ptr;
|
|
char *source,
|
|
*target;
|
|
int m,
|
|
fromlen,
|
|
tolen,
|
|
retlen,
|
|
i;
|
|
|
|
int str_len;
|
|
int estimate_len;
|
|
int len;
|
|
int source_len;
|
|
int from_index;
|
|
|
|
if ((m = VARSIZE(string) - VARHDRSZ) <= 0)
|
|
PG_RETURN_TEXT_P(string);
|
|
|
|
fromlen = VARSIZE(from) - VARHDRSZ;
|
|
from_ptr = VARDATA(from);
|
|
tolen = VARSIZE(to) - VARHDRSZ;
|
|
to_ptr = VARDATA(to);
|
|
|
|
str_len = VARSIZE(string);
|
|
estimate_len = (tolen * 1.0 / fromlen + 0.5) * str_len;
|
|
estimate_len = estimate_len > str_len ? estimate_len : str_len;
|
|
result = (text *) palloc(estimate_len);
|
|
|
|
source = VARDATA(string);
|
|
target = VARDATA(result);
|
|
retlen = 0;
|
|
|
|
while (m > 0)
|
|
{
|
|
source_len = pg_mblen(source);
|
|
from_index = 0;
|
|
|
|
for (i = 0; i < fromlen; i += len)
|
|
{
|
|
len = pg_mblen(&from_ptr[i]);
|
|
if (len == source_len &&
|
|
memcmp(source, &from_ptr[i], len) == 0)
|
|
break;
|
|
|
|
from_index++;
|
|
}
|
|
if (i < fromlen)
|
|
{
|
|
/* substitute */
|
|
char *p = to_ptr;
|
|
|
|
for (i = 0; i < from_index; i++)
|
|
{
|
|
p += pg_mblen(p);
|
|
if (p >= (to_ptr + tolen))
|
|
break;
|
|
}
|
|
if (p < (to_ptr + tolen))
|
|
{
|
|
len = pg_mblen(p);
|
|
memcpy(target, p, len);
|
|
target += len;
|
|
retlen += len;
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
/* no match, so copy */
|
|
memcpy(target, source, source_len);
|
|
target += source_len;
|
|
retlen += source_len;
|
|
}
|
|
|
|
source += source_len;
|
|
m -= source_len;
|
|
}
|
|
|
|
VARATT_SIZEP(result) = retlen + VARHDRSZ;
|
|
|
|
/*
|
|
* There may be some wasted space in the result if deletions occurred,
|
|
* but it's not worth reallocating it; the function result probably
|
|
* won't live long anyway.
|
|
*/
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* ascii
|
|
*
|
|
* Syntax:
|
|
*
|
|
* int ascii(text string)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Returns the decimal representation of the first character from
|
|
* string.
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
ascii(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
|
|
if (VARSIZE(string) <= VARHDRSZ)
|
|
PG_RETURN_INT32(0);
|
|
|
|
PG_RETURN_INT32((int32) *((unsigned char *) VARDATA(string)));
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* chr
|
|
*
|
|
* Syntax:
|
|
*
|
|
* text chr(int val)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Returns the character having the binary equivalent to val
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
chr(PG_FUNCTION_ARGS)
|
|
{
|
|
int32 cvalue = PG_GETARG_INT32(0);
|
|
text *result;
|
|
|
|
result = (text *) palloc(VARHDRSZ + 1);
|
|
VARATT_SIZEP(result) = VARHDRSZ + 1;
|
|
*VARDATA(result) = (char) cvalue;
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|
|
|
|
/********************************************************************
|
|
*
|
|
* repeat
|
|
*
|
|
* Syntax:
|
|
*
|
|
* text repeat(text string, int val)
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Repeat string by val.
|
|
*
|
|
********************************************************************/
|
|
|
|
Datum
|
|
repeat(PG_FUNCTION_ARGS)
|
|
{
|
|
text *string = PG_GETARG_TEXT_P(0);
|
|
int32 count = PG_GETARG_INT32(1);
|
|
text *result;
|
|
int slen,
|
|
tlen;
|
|
int i;
|
|
char *cp;
|
|
|
|
if (count < 0)
|
|
count = 0;
|
|
|
|
slen = (VARSIZE(string) - VARHDRSZ);
|
|
tlen = (VARHDRSZ + (count * slen));
|
|
|
|
/* Check for integer overflow */
|
|
if (slen != 0 && count != 0)
|
|
{
|
|
int check = count * slen;
|
|
int check2 = check + VARHDRSZ;
|
|
|
|
if ((check / slen) != count || check2 <= check)
|
|
elog(ERROR, "Requested buffer is too large.");
|
|
}
|
|
|
|
result = (text *) palloc(tlen);
|
|
|
|
VARATT_SIZEP(result) = tlen;
|
|
cp = VARDATA(result);
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
memcpy(cp, VARDATA(string), slen);
|
|
cp += slen;
|
|
}
|
|
|
|
PG_RETURN_TEXT_P(result);
|
|
}
|