574 lines
10 KiB
C
574 lines
10 KiB
C
/*
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* Edmund Mergl <E.Mergl@bawue.de>
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*
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/oracle_compat.c,v 1.27 2000/07/06 05:48:11 tgl Exp $
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*
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*/
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#include <ctype.h>
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#include "postgres.h"
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#include "utils/builtins.h"
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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(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.
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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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*ptr_ret;
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int m,
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n;
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if (((VARSIZE(string1) - VARHDRSZ) < 0) ||
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((m = len - (VARSIZE(string1) - VARHDRSZ)) <= 0) ||
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((VARSIZE(string2) - VARHDRSZ) <= 0))
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PG_RETURN_TEXT_P(string1);
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ret = (text *) palloc(VARHDRSZ + len);
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VARATT_SIZEP(ret) = VARHDRSZ + len;
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ptr2 = VARDATA(string2);
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ptr_ret = VARDATA(ret);
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while (m--)
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{
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*ptr_ret++ = *ptr2;
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ptr2 = (ptr2 == VARDATA(string2) + VARSIZE(string2) - VARHDRSZ - 1) ? VARDATA(string2) : ++ptr2;
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}
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n = VARSIZE(string1) - VARHDRSZ;
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ptr1 = VARDATA(string1);
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while (n--)
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*ptr_ret++ = *ptr1++;
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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.
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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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*ptr_ret;
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int m,
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n;
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if (((VARSIZE(string1) - VARHDRSZ) < 0) ||
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((m = len - (VARSIZE(string1) - VARHDRSZ)) <= 0) ||
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((VARSIZE(string2) - VARHDRSZ) <= 0))
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PG_RETURN_TEXT_P(string1);
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ret = (text *) palloc(VARHDRSZ + len);
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VARATT_SIZEP(ret) = VARHDRSZ + len;
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n = VARSIZE(string1) - VARHDRSZ;
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ptr1 = VARDATA(string1);
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ptr_ret = VARDATA(ret);
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while (n--)
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*ptr_ret++ = *ptr1++;
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ptr2 = VARDATA(string2);
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while (m--)
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{
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*ptr_ret++ = *ptr2;
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ptr2 = (ptr2 == VARDATA(string2) + VARSIZE(string2) - VARHDRSZ - 1) ? VARDATA(string2) : ++ptr2;
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}
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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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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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if ((m = VARSIZE(string) - VARHDRSZ) <= 0 ||
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(VARSIZE(set) - VARHDRSZ) <= 0)
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PG_RETURN_TEXT_P(string);
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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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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--;
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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 (*end == *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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end--;
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m--;
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}
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ret = (text *) palloc(VARHDRSZ + m);
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VARATT_SIZEP(ret) = VARHDRSZ + m;
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memcpy(VARDATA(ret), ptr, m);
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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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* ltrim
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*
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* Syntax:
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*
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* text ltrim(text string, text set)
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*
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* Purpose:
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*
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* Returns string with initial characters removed up to the first
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* character not in set.
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*
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********************************************************************/
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Datum
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ltrim(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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char *ptr,
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*ptr2,
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*end2;
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int m;
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if ((m = VARSIZE(string) - VARHDRSZ) <= 0 ||
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(VARSIZE(set) - VARHDRSZ) <= 0)
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PG_RETURN_TEXT_P(string);
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ptr = VARDATA(string);
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end2 = VARDATA(set) + VARSIZE(set) - VARHDRSZ - 1;
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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--;
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}
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ret = (text *) palloc(VARHDRSZ + m);
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VARATT_SIZEP(ret) = VARHDRSZ + m;
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memcpy(VARDATA(ret), ptr, m);
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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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* rtrim
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*
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* Syntax:
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*
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* text rtrim(text string, text set)
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*
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* Purpose:
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*
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* Returns string with final characters removed after the last
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* character not in set.
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*
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********************************************************************/
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Datum
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rtrim(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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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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if ((m = VARSIZE(string) - VARHDRSZ) <= 0 ||
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(VARSIZE(set) - VARHDRSZ) <= 0)
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PG_RETURN_TEXT_P(string);
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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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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 (*end == *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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end--;
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m--;
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}
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ret = (text *) palloc(VARHDRSZ + m);
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VARATT_SIZEP(ret) = VARHDRSZ + m;
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memcpy(VARDATA(ret), ptr, m);
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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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* translate
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*
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* Syntax:
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*
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* text translate(text string, text from, text to)
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*
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* Purpose:
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*
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* Returns string after replacing all occurrences of characters in from
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* with the corresponding character in to. If from is longer than to,
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* occurrences of the extra characters in from are deleted.
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* Improved by Edwin Ramirez <ramirez@doc.mssm.edu>.
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*
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********************************************************************/
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Datum
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translate(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P(0);
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text *from = PG_GETARG_TEXT_P(1);
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text *to = PG_GETARG_TEXT_P(2);
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text *result;
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char *from_ptr,
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*to_ptr;
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char *source,
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*target;
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int m,
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fromlen,
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tolen,
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retlen,
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i;
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if ((m = VARSIZE(string) - VARHDRSZ) <= 0)
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PG_RETURN_TEXT_P(string);
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fromlen = VARSIZE(from) - VARHDRSZ;
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from_ptr = VARDATA(from);
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tolen = VARSIZE(to) - VARHDRSZ;
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to_ptr = VARDATA(to);
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result = (text *) palloc(VARSIZE(string));
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source = VARDATA(string);
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target = VARDATA(result);
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retlen = 0;
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while (m-- > 0)
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{
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char rep = *source++;
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for (i = 0; i < fromlen; i++)
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{
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if (from_ptr[i] == rep)
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break;
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}
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if (i < fromlen)
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{
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if (i < tolen)
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{
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/* substitute */
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*target++ = to_ptr[i];
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retlen++;
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}
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else
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{
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/* discard */
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}
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}
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else
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{
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/* no match, so copy */
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*target++ = rep;
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retlen++;
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}
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}
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VARATT_SIZEP(result) = retlen + VARHDRSZ;
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/*
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* There may be some wasted space in the result if deletions occurred,
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* but it's not worth reallocating it; the function result probably
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* won't live long anyway.
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*/
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PG_RETURN_TEXT_P(result);
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}
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Datum
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ascii(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P(0);
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if (VARSIZE(string) <= VARHDRSZ)
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PG_RETURN_INT32(0);
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PG_RETURN_INT32((int32) *((unsigned char *) VARDATA(string)));
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}
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Datum
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ichar(PG_FUNCTION_ARGS)
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{
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int32 cvalue = PG_GETARG_INT32(0);
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text *result;
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result = (text *) palloc(VARHDRSZ + 1);
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VARATT_SIZEP(result) = VARHDRSZ + 1;
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*VARDATA(result) = (char) cvalue;
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PG_RETURN_TEXT_P(result);
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}
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Datum
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repeat(PG_FUNCTION_ARGS)
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{
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text *string = PG_GETARG_TEXT_P(0);
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int32 count = PG_GETARG_INT32(1);
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text *result;
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int slen,
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tlen;
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int i;
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char *cp;
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if (count < 0)
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count = 0;
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slen = (VARSIZE(string) - VARHDRSZ);
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tlen = (VARHDRSZ + (count * slen));
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result = (text *) palloc(tlen);
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VARATT_SIZEP(result) = tlen;
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cp = VARDATA(result);
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for (i = 0; i < count; i++)
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{
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memcpy(cp, VARDATA(string), slen);
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cp += slen;
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}
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PG_RETURN_TEXT_P(result);
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}
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