mirror of
https://git.postgresql.org/git/postgresql.git
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703 lines
12 KiB
C
703 lines
12 KiB
C
/*
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* Edmund Mergl <E.Mergl@bawue.de>
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*
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* $Id: oracle_compat.c,v 1.3 1997/03/15 06:00:19 scrappy 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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/********************************************************************
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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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text *
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LOWER(text *string)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ret = (text *)malloc(VARSIZE(string));
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VARSIZE(ret) = VARSIZE(string);
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ptr = VARDATA(string);
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = tolower(*ptr++);
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}
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return ret;
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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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text *
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UPPER(text *string)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ret = (text *)malloc(VARSIZE(string));
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VARSIZE(ret) = VARSIZE(string);
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ptr = VARDATA(string);
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = toupper(*ptr++);
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}
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return ret;
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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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text *
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INITCAP(text *string)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ret = (text *)malloc(VARSIZE(string));
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VARSIZE(ret) = VARSIZE(string);
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ptr = VARDATA(string);
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ptr_ret = VARDATA(ret);
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*ptr_ret++ = toupper(*ptr++);
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--m;
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while (m--) {
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if (*(ptr_ret - 1) == ' ' || *(ptr_ret - 1) == ' ') {
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*ptr_ret++ = toupper(*ptr++);
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} else {
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*ptr_ret++ = tolower(*ptr++);
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}
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}
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return ret;
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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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text *
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LPAD(text *string1, int4 len, text *string2)
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{
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text *ret;
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char *ptr1, *ptr2, *ptr_ret;
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int m, n;
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m = len - VARSIZE(string1) + VARHDRSZ;
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if (m <= 0 || (VARSIZE(string2) - VARHDRSZ) <= 0) {
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return string1;
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}
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(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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*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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}
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return 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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text *
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RPAD(text *string1, int4 len, text *string2)
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{
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text *ret;
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char *ptr1, *ptr2, *ptr_ret;
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int m, n;
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m = len - VARSIZE(string1) + VARHDRSZ;
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if (m <= 0 || (VARSIZE(string2) - VARHDRSZ) <= 0) {
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return string1;
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}
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(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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}
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ptr2 = VARDATA(string2);
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while (m--) {
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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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return 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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text *
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LTRIM(text *string, text *set)
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{
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text *ret;
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char *ptr, *ptr2, *end2, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0 || VARSIZE(set) - VARHDRSZ <= 0) {
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return string;
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}
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ptr = VARDATA(string);
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ptr2 = VARDATA(set);
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end2 = VARDATA(set) + VARSIZE(set) - VARHDRSZ - 1;
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while (m--) {
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while (ptr2 <= end2) {
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if (*ptr == *ptr2) {
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break;
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}
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++ptr2;
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}
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if (*ptr != *ptr2) {
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break;
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}
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ptr++;
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ptr2 = VARDATA(set);
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}
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++m;
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ret = (text *)malloc(VARHDRSZ + m);
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VARSIZE(ret) = VARHDRSZ + m;
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = *ptr++;
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}
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return 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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text *
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RTRIM(text *string, text *set)
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{
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text *ret;
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char *ptr, *ptr2, *end2, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0 || VARSIZE(set) - VARHDRSZ <= 0) {
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return string;
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}
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ptr = VARDATA(string) + VARSIZE(string) - VARHDRSZ - 1;
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ptr2 = VARDATA(set);
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end2 = VARDATA(set) + VARSIZE(set) - VARHDRSZ - 1;
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while (m--) {
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while (ptr2 <= end2) {
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if (*ptr == *ptr2) {
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break;
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}
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++ptr2;
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}
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if (*ptr != *ptr2) {
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break;
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}
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--ptr;
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ptr2 = VARDATA(set);
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}
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++m;
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ret = (text *)malloc(VARHDRSZ + m);
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VARSIZE(ret) = VARHDRSZ + m;
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ptr_ret = VARDATA(ret) + m - 1;
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while (m--) {
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*ptr_ret-- = *ptr--;
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}
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return ret;
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}
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/********************************************************************
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*
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* SUBSTR
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*
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* Syntax:
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*
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* text *SUBSTR(text *string, int4 m, int4 n)
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*
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* Purpose:
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*
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* Returns a portion of string, beginning at character m, n
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* characters long. The first position of string is 1.
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*
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********************************************************************/
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text *
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SUBSTR(text *string, int4 m, int4 n)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int len;
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len = VARSIZE(string) - VARHDRSZ - m;
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if (m <= 0 || n <= 0 || len <= 0) {
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return string;
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}
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len = len + 1 < n ? len + 1 : n;
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(ret) = VARHDRSZ + len;
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ptr = VARDATA(string) + m - 1;
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ptr_ret = VARDATA(ret);
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while (len--) {
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*ptr_ret++ = *ptr++;
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}
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return 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, char from, char to)
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*
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* Purpose:
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*
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* Returns string after replacing all occurences of from with
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* the corresponding character in to. TRANSLATE will not remove
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* characters.
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*
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********************************************************************/
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text *
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TRANSLATE(text *string, char from, char to)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ret = (text *)malloc(VARSIZE(string));
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VARSIZE(ret) = VARSIZE(string);
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ptr = VARDATA(string);
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = *ptr == from ? to : *ptr;
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ptr++;
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}
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return ret;
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}
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/********************************************************************
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*
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* Functions in lower case are the equivalents with the last
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* parameter beeing set to a reasonable default.
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*
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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)
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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 blanks.
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*
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********************************************************************/
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text *
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lpad(text *string1, int4 len)
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{
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text *ret;
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char *ptr1, *ptr_ret;
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int m, n;
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m = len - VARSIZE(string1) + VARHDRSZ;
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if (m <= 0) {
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return string1;
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}
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(ret) = VARHDRSZ + len;
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = ' ';
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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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}
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return 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)
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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 blanks.
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*
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********************************************************************/
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text *
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rpad(text *string1, int4 len)
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{
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text *ret;
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char *ptr1, *ptr_ret;
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int m, n;
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m = len - VARSIZE(string1) + VARHDRSZ;
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if (m <= 0) {
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return string1;
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}
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(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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}
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while (m--) {
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*ptr_ret++ = ' ';
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}
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return 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)
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*
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* Purpose:
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*
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* Returns string with initial blanks removed.
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*
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********************************************************************/
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text *
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ltrim(text *string)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ptr = VARDATA(string);
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while (m--) {
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if (*ptr != ' ') {
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break;
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}
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++ptr;
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}
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++m;
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ret = (text *)malloc(VARHDRSZ + m);
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VARSIZE(ret) = VARHDRSZ + m;
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ptr_ret = VARDATA(ret);
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while (m--) {
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*ptr_ret++ = *ptr++;
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}
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return 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)
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*
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* Purpose:
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*
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* Returns string with final blanks removed.
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*
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********************************************************************/
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text *
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rtrim(text *string)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int m;
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m = VARSIZE(string) - VARHDRSZ;
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if (m <= 0) {
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return string;
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}
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ptr = VARDATA(string) + VARSIZE(string) - VARHDRSZ - 1;
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while (m--) {
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if (*ptr != ' ') {
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break;
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}
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--ptr;
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}
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++m;
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ret = (text *)malloc(VARHDRSZ + m);
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VARSIZE(ret) = VARHDRSZ + m;
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ptr_ret = VARDATA(ret) + m - 1;
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while (m--) {
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*ptr_ret-- = *ptr--;
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}
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return ret;
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}
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/********************************************************************
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*
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* substr
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*
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* Syntax:
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*
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* text *substr(text *string, int4 m)
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*
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* Purpose:
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*
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* Returns a portion of string, beginning at character m, up to
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* the end of string. The first position of string is 1.
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*
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********************************************************************/
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text *
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substr(text *string, int4 m)
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{
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text *ret;
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char *ptr, *ptr_ret;
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int len;
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len = VARSIZE(string) - VARHDRSZ - m;
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if (m <= 0 || len <= 0) {
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return string;
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}
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len = len + 1;
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ret = (text *)malloc(VARHDRSZ + len);
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VARSIZE(ret) = VARHDRSZ + len;
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ptr = VARDATA(string) + m - 1;
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ptr_ret = VARDATA(ret);
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while (len--) {
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*ptr_ret++ = *ptr++;
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}
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return ret;
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}
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/* EOF */
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