+++ /dev/null
-/*
- * array_iterator.c --
- *
- * This file defines a new group of operators which take an
- * array and a scalar value, iterate a scalar operator over the
- * elements of the array and the value and compute a result as
- * the logical OR or AND of the results.
- * For example array_int4eq returns true if some of the elements
- * of an array of int4 is equal to the given value:
- *
- * array_int4eq({1,2,3}, 1) --> true
- * array_int4eq({1,2,3}, 4) --> false
- *
- * If we have defined T array types and O scalar operators
- * we can define T x O array operators, each of them has a name
- * like "array_<basetype><operation>" and takes an array of type T
- * iterating the operator O over all the elements. Note however
- * that some of the possible combination are invalid, for example
- * the array_int4_like because there is no like operator for int4.
- * It is now possible to write queries which look inside the arrays:
- *
- * create table t(id int4[], txt text[]);
- * select * from t where t.id *= 123;
- * select * from t where t.txt *~ '[a-z]';
- * select * from t where t.txt[1:3] **~ '[a-z]';
- *
- * Copyright (c) 1996, Massimo Dal Zotto <dz@cs.unitn.it>
- */
-
-#include <ctype.h>
-#include <stdio.h>
-#include <sys/types.h>
-#include <string.h>
-
-#include "postgres.h"
-#include "pg_type.h"
-#include "miscadmin.h"
-#include "syscache.h"
-#include "access/xact.h"
-#include "utils/builtins.h"
-#include "utils/elog.h"
-
-static int32
-array_iterator(Oid elemtype, Oid proc, int and, ArrayType *array, Datum value)
-{
- HeapTuple typ_tuple;
- TypeTupleForm typ_struct;
- bool typbyval;
- int typlen;
- func_ptr proc_fn;
- int pronargs;
- int nitems, i, result;
- int ndim, *dim;
- char *p;
-
- /* Sanity checks */
- if ((array == (ArrayType *) NULL)
- || (ARR_IS_LO(array) == true)) {
- /* elog(NOTICE, "array_iterator: array is null"); */
- return (0);
- }
- ndim = ARR_NDIM(array);
- dim = ARR_DIMS(array);
- nitems = getNitems(ndim, dim);
- if (nitems == 0) {
- /* elog(NOTICE, "array_iterator: nitems = 0"); */
- return (0);
- }
-
- /* Lookup element type information */
- typ_tuple = SearchSysCacheTuple(TYPOID, ObjectIdGetDatum(elemtype),0,0,0);
- if (!HeapTupleIsValid(typ_tuple)) {
- elog(WARN,"array_iterator: cache lookup failed for type %d", elemtype);
- return 0;
- }
- typ_struct = (TypeTupleForm) GETSTRUCT(typ_tuple);
- typlen = typ_struct->typlen;
- typbyval = typ_struct->typbyval;
-
- /* Lookup the function entry point */
- proc_fn == (func_ptr) NULL;
- fmgr_info(proc, &proc_fn, &pronargs);
- if ((proc_fn == NULL) || (pronargs != 2)) {
- elog(WARN, "array_iterator: fmgr_info lookup failed for oid %d", proc);
- return (0);
- }
-
- /* Scan the array and apply the operator to each element */
- result = 0;
- p = ARR_DATA_PTR(array);
- for (i = 0; i < nitems; i++) {
- if (typbyval) {
- switch(typlen) {
- case 1:
- result = (int) (*proc_fn)(*p, value);
- break;
- case 2:
- result = (int) (*proc_fn)(* (int16 *) p, value);
- break;
- case 3:
- case 4:
- result = (int) (*proc_fn)(* (int32 *) p, value);
- break;
- }
- p += typlen;
- } else {
- result = (int) (*proc_fn)(p, value);
- if (typlen > 0) {
- p += typlen;
- } else {
- p += INTALIGN(* (int32 *) p);
- }
- }
- if (result) {
- if (!and) {
- return (1);
- }
- } else {
- if (and) {
- return (0);
- }
- }
- }
-
- if (and && result) {
- return (1);
- } else {
- return (0);
- }
-}
-
-/*
- * Iterators for type _text
- */
-
-int32
-array_texteq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 25, /* text */
- (Oid) 67, /* texteq */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_texteq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 25, /* text */
- (Oid) 67, /* texteq */
- 1, /* logical and */
- array, (Datum)value);
-}
-
-int32
-array_textregexeq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 25, /* text */
- (Oid) 81, /* textregexeq */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_textregexeq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 25, /* text */
- (Oid) 81, /* textregexeq */
- 1, /* logical and */
- array, (Datum)value);
-}
-
-/*
- * Iterators for type _char16. Note that the regexp operators
- * take the second argument of type text.
- */
-
-int32
-array_char16eq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 20, /* char16 */
- (Oid) 490, /* char16eq */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_char16eq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 20, /* char16 */
- (Oid) 490, /* char16eq */
- 1, /* logical and */
- array, (Datum)value);
-}
-
-int32
-array_char16regexeq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 20, /* char16 */
- (Oid) 700, /* char16regexeq */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_char16regexeq(ArrayType *array, char* value)
-{
- return array_iterator((Oid) 20, /* char16 */
- (Oid) 700, /* char16regexeq */
- 1, /* logical and */
- array, (Datum)value);
-}
-
-/*
- * Iterators for type _int4
- */
-
-int32
-array_int4eq(ArrayType *array, int4 value)
-{
- return array_iterator((Oid) 23, /* int4 */
- (Oid) 65, /* int4eq */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_int4eq(ArrayType *array, int4 value)
-{
- return array_iterator((Oid) 23, /* int4 */
- (Oid) 65, /* int4eq */
- 1, /* logical and */
- array, (Datum)value);
-}
-
-int32
-array_int4gt(ArrayType *array, int4 value)
-{
- return array_iterator((Oid) 23, /* int4 */
- (Oid) 147, /* int4gt */
- 0, /* logical or */
- array, (Datum)value);
-}
-
-int32
-array_all_int4gt(ArrayType *array, int4 value)
-{
- return array_iterator((Oid) 23, /* int4 */
- (Oid) 147, /* int4gt */
- 1, /* logical and */
- array, (Datum)value);
-}
+++ /dev/null
-From: Massimo Dal Zotto <dz@cs.unitn.it>
-Date: Mon, 6 May 1996 01:03:37 +0200 (MET DST)
-Subject: [PG95]: new operators for arrays
-
-- -----BEGIN PGP SIGNED MESSAGE-----
-
-Hi,
-
-I have written an extension to Postgres95 which allows to use qualification
-clauses based on the values of single elements of arrays.
-For example I can now select rows having some or all element of an array
-attribute equal to a given value or matching a regular expression:
-
-select * from t where t.foo *= 'bar';
-select * from t where t.foo **~ '^ba[rz]';
-
-The scheme is quite general, each operator which operates on a base type can
-be iterated over the elements of an array. It seem to work well but defining
-each new operators requires writing a different C function. Furthermore in
-each function there are two hardcoded OIDs which reference a base type and
-a procedure. Not very portable. Can anyone suggest a better and more portable
-way to do it ? Do you think this could be a useful feature for next release ?
-Here is my code, it can be compiled and loaded as a dynamic module without
-need to recompile the backend. I have defined only the few operators I needed,
-the list can be extended. Feddback is welcome.
-
+++ /dev/null
-/*
- * SQL code
-
-- - -- load the new functions
-- - --
-load '/home/dz/lib/postgres/array_iterator.so';
-
-- - -- define the array operators *=, **=, *~ and **~ for type _text
-- - --
-create function array_texteq(_text, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_texteq(_text, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_textregexeq(_text, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_textregexeq(_text, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create operator *= (
- leftarg=_text,
- rightarg=text,
- procedure=array_texteq);
-
-create operator **= (
- leftarg=_text,
- rightarg=text,
- procedure=array_all_texteq);
-
-create operator *~ (
- leftarg=_text,
- rightarg=text,
- procedure=array_textregexeq);
-
-create operator **~ (
- leftarg=_text,
- rightarg=text,
- procedure=array_all_textregexeq);
-
-- - -- define the array operators *=, **=, *~ and **~ for type _char16
-- - --
-create function array_char16eq(_char16, char16)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_char16eq(_char16, char16)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_char16regexeq(_char16, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_char16regexeq(_char16, text)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create operator *= (
- leftarg=_char16,
- rightarg=char16,
- procedure=array_char16eq);
-
-create operator **= (
- leftarg=_char16,
- rightarg=char16,
- procedure=array_all_char16eq);
-
-create operator *~ (
- leftarg=_char16,
- rightarg=text,
- procedure=array_char16regexeq);
-
-create operator **~ (
- leftarg=_char16,
- rightarg=text,
- procedure=array_all_char16regexeq);
-
-- - -- define the array operators *=, **=, *> and **> for type _int4
-- - --
-create function array_int4eq(_int4, int4)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_int4eq(_int4, int4)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_int4gt(_int4, int4)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create function array_all_int4gt(_int4, int4)
- returns bool
- as '/home/dz/lib/postgres/array_iterator.so'
- language 'c';
-
-create operator *= (
- leftarg=_int4,
- rightarg=int4,
- procedure=array_int4eq);
-
-create operator **= (
- leftarg=_int4,
- rightarg=int4,
- procedure=array_all_int4eq);
-
-create operator *> (
- leftarg=_int4,
- rightarg=int4,
- procedure=array_int4gt);
-
-create operator **> (
- leftarg=_int4,
- rightarg=int4,
- procedure=array_all_int4gt);
-
-*/
-
-/* end of file */
-
+++ /dev/null
-/*
- * datetime_functions.c --
- *
- * This file defines new functions for the time and date data types.
- *
- * Copyright (c) 1996, Massimo Dal Zotto <dz@cs.unitn.it>
- */
-
-#include <time.h>
-
-#include "postgres.h"
-#include "pg_type.h"
-#include "utils/palloc.h"
-
-typedef struct DateADT {
- char day;
- char month;
- short year;
-} DateADT;
-
-typedef struct TimeADT {
- short hr;
- short min;
- float sec;
-} TimeADT;
-
-TimeADT *
-time_difference(TimeADT *time1, TimeADT *time2)
-{
- TimeADT *time = (TimeADT*)palloc(sizeof(TimeADT));
-
- time->sec = time1->sec - time2->sec;
- time->min = time1->min - time2->min;
- time->hr = time1->hr - time2->hr;
-
- if (time->sec < 0) {
- time->sec += 60.0;
- time->min--;
- } else if (time->sec >= 60.0) {
- time->sec -= 60.0;
- time->min++;
- }
-
- if (time->min < 0) {
- time->min += 60;
- time->hr--;
- } else if (time->min >= 60) {
- time->min -= 60;
- time->hr++;
- }
-
- if (time->hr < 0) {
- time->hr += 24;
- } else if (time->hr >= 24) {
- time->hr -= 24;
- }
-
- return (time);
-}
-
-TimeADT *
-currentTime()
-{
- time_t current_time;
- struct tm *tm;
- TimeADT *result = (TimeADT*)palloc(sizeof(TimeADT));
-
- current_time = time(NULL);
- tm = localtime(¤t_time);
- result->sec = tm->tm_sec;
- result->min = tm->tm_min;
- result->hr = tm->tm_hour;
-
- return (result);
-}
-
-int4
-currentDate()
-{
- time_t current_time;
- struct tm *tm;
- int4 result;
- DateADT *date = (DateADT*)&result;
-
- current_time = time(NULL);
- tm = localtime(¤t_time);
- date->day = tm->tm_mday;
- date->month = tm->tm_mon+1;
- date->year = tm->tm_year+1900;
-
- return (result);
-}
-
-int4
-hours(TimeADT *time)
-{
- return (time->hr);
-}
-
-int4
-minutes(TimeADT *time)
-{
- return (time->min);
-}
-
-int4
-seconds(TimeADT *time)
-{
- int seconds = (int)time->sec;
- return (seconds);
-}
-
-int4
-day(int4 val)
-{
- DateADT *date = (DateADT*)&val;
- return (date->day);
-}
-
-int4
-month(int4 val)
-{
- DateADT *date = (DateADT*)&val;
- return (date->month);
-}
-
-int4
-year(int4 val)
-{
- DateADT *date = (DateADT*)&val;
- return (date->year);
-}
-
-int4
-asMinutes(TimeADT *time)
-{
- int seconds = (int)time->sec;
- return (time->min + 60*time->hr);
-}
-
-int4
-asSeconds(TimeADT *time)
-{
- int seconds = (int)time->sec;
- return (seconds + 60*time->min + 3600*time->hr);
-}
-
+++ /dev/null
-From: Massimo Dal Zotto <dz@cs.unitn.it>
-Date: Tue, 14 May 1996 14:31:18 +0200 (MET DST)
-Subject: [PG95]: new postgres functions
-
-- -----BEGIN PGP SIGNED MESSAGE-----
-
-Some time ago I read in the mailing list requests of people looking
-for more time and date functions. I have now written some of them:
-
- time_difference(time1, time2) ,also defined as operator '-'
- hour(time)
- minutes(time)
- seconds(time)
- asMinutes(time)
- asSeconds(time)
- currentTime()
- currentDate()
-
-The file can be compiled as shared library and loaded as dynamic module
-without need to recompile the backend. This can also be taken as an example
-of the extensibility of postgres (user-defined functions, operators, etc).
-I would be nice to see more of these user contributed modules posted to this
-list and hopefully accessible from the Postgres home page.
-
-
+++ /dev/null
-
--- SQL code to load and define 'datetime' functions
-
--- load the new functions
-
-load '/home/dz/lib/postgres/datetime_functions.so';
-
--- define the new functions in postgres
-
-create function time_difference(time,time)
- returns time
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function currentDate()
- returns date
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function currentTime()
- returns time
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function hours(time)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function minutes(time)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function seconds(time)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function day(date)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function month(date)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function year(date)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function asMinutes(time)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create function asSeconds(time)
- returns int4
- as '/home/dz/lib/postgres/datetime_functions.so'
- language 'c';
-
-create operator - (
- leftarg=time,
- rightarg=time,
- procedure=time_difference);
-
+++ /dev/null
-/*****************************************************************************/
-/* soundex.c */
-/*****************************************************************************/
-
-#include <string.h>
-#include <stdio.h>
-#include "postgres.h" /* for char16, etc. */
-#include "utils/palloc.h" /* for palloc */
-#include "libpq-fe.h" /* for TUPLE */
-#include <stdio.h>
-#include <ctype.h>
-
-/* prototype for soundex function */
-char *soundex(char *instr, char *outstr);
-
-text *text_soundex(text *t)
-{
- /* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
- char *table = "01230120022455012623010202";
- int count = 0;
- text *new_t;
-
- char outstr[6+1]; /* max length of soundex is 6 */
- char *instr;
-
- /* make a null-terminated string */
- instr=palloc(VARSIZE(t)+1);
- memcpy(instr,VARDATA(t),VARSIZE(t)-VARHDRSZ);
- instr[VARSIZE(t)-VARHDRSZ] = (char)0;
-
- /* load soundex into outstr */
- soundex(instr, outstr);
-
- /* Now the outstr contains the soundex of instr */
- /* copy outstr to new_t */
- new_t = (text *) palloc(strlen(outstr)+VARHDRSZ);
- memset(new_t, 0, strlen(outstr)+1);
- VARSIZE(new_t) = strlen(outstr)+VARHDRSZ;
- memcpy((void *) VARDATA(new_t),
- (void *) outstr,
- strlen(outstr));
-
- /* free instr */
- pfree(instr);
-
- return(new_t);
-}
-
-char *soundex(char *instr, char *outstr)
-{ /* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
- char *table = "01230120022455012623010202";
- int count = 0;
-
- while(!isalpha(instr[0]) && instr[0])
- ++instr;
-
- if(!instr[0]) { /* Hey! Where'd the string go? */
- outstr[0]=(char)0;
- return outstr;
- }
-
- if(toupper(instr[0]) == 'P' && toupper(instr[1]) == 'H') {
- instr[0] = 'F';
- instr[1] = 'A';
- }
-
- *outstr++ = (char)toupper(*instr++);
-
- while(*instr && count < 5) {
- if(isalpha(*instr) && *instr != *(instr-1)) {
- *outstr = table[toupper(instr[0]) - 'A'];
- if(*outstr != '0') {
- ++outstr;
- ++count;
- }
- }
- ++instr;
- }
-
- *outstr = '\0';
- return(outstr);
-}
-
+++ /dev/null
---------------- soundex.sql:
-
-CREATE FUNCTION text_soundex(text) RETURNS text
- AS '/usr/local/postgres/postgres95/src/funcs/soundex.so' LANGUAGE 'c';
-
-SELECT text_soundex('hello world!');
-
-CREATE TABLE s (nm text)\g
-
-insert into s values ('john')\g
-insert into s values ('joan')\g
-insert into s values ('wobbly')\g
-
-select * from s
-where text_soundex(nm) = text_soundex('john')\g
-
-select nm from s a, s b
-where text_soundex(a.nm) = text_soundex(b.nm)
-and a.oid <> b.oid\g
-
-CREATE FUNCTION text_sx_eq(text, text) RETURNS bool AS
-'select text_soundex($1) = text_soundex($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_sx_lt(text,text) RETURNS bool AS
-'select text_soundex($1) < text_soundex($2)'
-LANGUAGE 'sql'\g
-
-CREATE FUNCTION text_sx_gt(text,text) RETURNS bool AS
-'select text_soundex($1) > text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_le(text,text) RETURNS bool AS
-'select text_soundex($1) <= text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_ge(text,text) RETURNS bool AS
-'select text_soundex($1) >= text_soundex($2)'
-LANGUAGE 'sql';
-
-CREATE FUNCTION text_sx_ne(text,text) RETURNS bool AS
-'select text_soundex($1) <> text_soundex($2)'
-LANGUAGE 'sql';
-
-DROP OPERATOR #= (text,text)\g
-
-CREATE OPERATOR #= (leftarg=text, rightarg=text, procedure=text_sx_eq,
-commutator=text_sx_eq)\g
-
-SELECT *
-FROM s
-WHERE text_sx_eq(nm,'john')\g
-
-SELECT *
-from s
-where s.nm #= 'john';
-
+++ /dev/null
-/*
- * string_io.c --
- *
- * This file defines new input/output conversion routines for strings.
- *
- * Copyright (c) 1996, Massimo Dal Zotto <dz@cs.unitn.it>
- */
-
-#include <ctype.h>
-#include <string.h>
-
-#include "postgres.h"
-#include "utils/elog.h"
-#include "utils/palloc.h"
-#include "utils/builtins.h"
-
-/* define this if you want to see iso-8859 characters */
-#define ISO8859
-
-#define MIN(x, y) ((x) < (y) ? (x) : (y))
-#define VALUE(char) ((char) - '0')
-#define DIGIT(val) ((val) + '0')
-#define ISOCTAL(c) (((c) >= '0') && ((c) <= '7'))
-#ifndef ISO8859
-#define NOTPRINTABLE(c) (!isprint(c))
-#else
-#define NOTPRINTABLE(c) (!isprint(c) && ((c) < 0xa0))
-#endif
-
-/*
- * string_output() --
- *
- * This function takes a pointer to a string data and an optional
- * data size and returns a printable representation of the data
- * translating all escape sequences to C-like \nnn or \c escapes.
- * The function is used by output methods of various string types.
- *
- * Arguments:
- * data - input data (can be NULL)
- * size - optional size of data. A negative value indicates
- * that data is a null terminated string.
- *
- * Returns:
- * a pointer to a new string containing the printable
- * representation of data.
- */
-
-char *
-string_output(char *data, int size)
-{
- register unsigned char c, *p, *r, *result;
- register int l, len;
-
- if (data == NULL) {
- result = (char *) palloc(2);
- result[0] = '-';
- result[1] = '\0';
- return (result);
- }
-
- if (size < 0) {
- size = strlen(data);
- }
-
- /* adjust string length for escapes */
- len = size;
- for (p=data,l=size; l>0; p++,l--) {
- switch (*p) {
- case '\\':
- case '"' :
- case '{':
- case '}':
- case '\b':
- case '\f':
- case '\n':
- case '\r':
- case '\t':
- case '\v':
- len++;
- break;
- default:
- if (NOTPRINTABLE(c)) {
- len += 3;
- }
- }
- }
- len++;
-
- result = (char *) palloc(len);
-
- for (p=data,r=result,l=size; (l > 0) && (c = *p); p++,l--) {
- switch (c) {
- case '\\':
- case '"' :
- case '{':
- case '}':
- *r++ = '\\';
- *r++ = c;
- break;
- case '\b':
- *r++ = '\\';
- *r++ = 'b';
- break;
- case '\f':
- *r++ = '\\';
- *r++ = 'f';
- break;
- case '\n':
- *r++ = '\\';
- *r++ = 'n';
- break;
- case '\r':
- *r++ = '\\';
- *r++ = 'r';
- break;
- case '\t':
- *r++ = '\\';
- *r++ = 't';
- break;
- case '\v':
- *r++ = '\\';
- *r++ = 'v';
- break;
- default:
- if (NOTPRINTABLE(c)) {
- *r = '\\';
- r += 3;
- *r-- = DIGIT(c & 07);
- c >>= 3;
- *r-- = DIGIT(c & 07);
- c >>= 3;
- *r = DIGIT(c & 03);
- r += 3;
- } else {
- *r++ = c;
- }
- }
- }
- *r = '\0';
-
- return((char *) result);
-}
-
-/*
- * string_input() --
- *
- * This function accepts a C string in input and copies it into a new
- * object allocated with palloc() translating all escape sequences.
- * An optional header can be allocatd before the string, for example
- * to hold the length of a varlena object.
- * This function is not necessary for input from sql commands because
- * the parser already does escape translation, all data input routines
- * receive strings in internal form.
- *
- * Arguments:
- * str - input string possibly with escapes
- * size - the required size of new data. A value of 0
- * indicates a variable size string, while a
- * negative value indicates a variable size string
- * of size not greater than this absolute value.
- * hdrsize - size of an optional header to be allocated before
- * the data. It must then be filled by the caller.
- * rtn_size - an optional pointer to an int variable where the
- * size of the new string is stored back.
- *
- * Returns:
- * a pointer to the new string or the header.
- */
-
-char *
-string_input(char *str, int size, int hdrsize, int *rtn_size)
-{
- register unsigned char *p, *r;
- unsigned char *result;
- int len;
-
- if ((str == NULL) || (hdrsize < 0)) {
- return (char *) NULL;
- }
-
- /* Compute result size */
- len = strlen(str);
- for (p=str; *p; ) {
- if (*p++ == '\\') {
- if (ISOCTAL(*p)) {
- if (ISOCTAL(*(p+1))) {
- p++;
- len--;
- }
- if (ISOCTAL(*(p+1))) {
- p++;
- len--;
- }
- }
- if (*p) p++;
- len--;
- }
- }
-
- /* result has variable length */
- if (size == 0) {
- size = len+1;
- } else
-
- /* result has variable length with maximum size */
- if (size < 0) {
- size = MIN(len, - size)+1;
- }
-
- result = (char *) palloc(hdrsize+size);
- memset(result, 0, hdrsize+size);
- if (rtn_size) {
- *rtn_size = size;
- }
-
- r = result + hdrsize;
- for (p=str; *p; ) {
- register unsigned char c;
- if ((c = *p++) == '\\') {
- switch (c = *p++) {
- case '\0':
- p--;
- break;
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- c = VALUE(c);
- if (isdigit(*p)) {
- c = (c<<3) + VALUE(*p++);
- }
- if (isdigit(*p)) {
- c = (c<<3) + VALUE(*p++);
- }
- *r++ = c;
- break;
- case 'b':
- *r++ = '\b';
- break;
- case 'f':
- *r++ = '\f';
- break;
- case 'n':
- *r++ = '\n';
- break;
- case 'r':
- *r++ = '\r';
- break;
- case 't':
- *r++ = '\t';
- break;
- case 'v':
- *r++ = '\v';
- break;
- default:
- *r++ = c;
- }
- } else {
- *r++ = c;
- }
- }
-
- return((char *) result);
-}
-
-char *
-c_charout(int32 c)
-{
- char str[2];
-
- str[0] = (char) c;
- str[1] = '\0';
-
- return (string_output(str, 1));
-}
-
-char *
-c_char2out(uint16 s)
-{
- return (string_output((char *) &s, 2));
-}
-
-char *
-c_char4out(uint32 s)
-{
- return (string_output((char *) &s, 4));
-}
-
-char *
-c_char8out(char *s)
-{
- return (string_output(s, 8));
-}
-
-char *
-c_char16out(char *s)
-{
- return (string_output(s, 16));
-}
-
-/*
- * This can be used for text, bytea, SET and unknown data types
- */
-
-char *
-c_textout(struct varlena *vlena)
-{
- int len = 0;
- char *s = NULL;
-
- if (vlena) {
- len = VARSIZE(vlena) - VARHDRSZ;
- s = VARDATA(vlena);
- }
- return (string_output(s, len));
-}
-
-/*
- * This can be used for varchar and bpchar strings
- */
-
-char *
-c_varcharout(char *s)
-{
- int len;
-
- if (s) {
- len = *(int32*)s - 4;
- s += 4;
- }
- return (string_output(s, len));
-}
-
-#ifdef 0
-struct varlena *
-c_textin(char *str)
-{
- struct varlena *result;
- int len;
-
- if (str == NULL) {
- return ((struct varlena *) NULL);
- }
-
- result = (struct varlena *) string_input(str, 0, VARHDRSZ, &len);
- VARSIZE(result) = len;
-
- return (result);
-}
-
-char *
-c_char16in(char *str)
-{
- return (string_input(str, 16, 0, NULL));
-}
-#endif
-
+++ /dev/null
-
-- - -- load the new functions
-- - --
-load '/home/dz/lib/postgres/string_output.so';
-
-- - -- create function c_textin(opaque)
-- - -- returns text
-- - -- as '/home/dz/lib/postgres/string_output.so'
-- - -- language 'c';
-
-create function c_charout(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_char2out(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_char4out(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_char8out(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_char16out(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_textout(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-create function c_varcharout(opaque)
- returns int4
- as '/home/dz/lib/postgres/string_output.so'
- language 'c';
-
-- - -- define a function which sets the new output routines for char types
-- - --
-- - -- select c_mode();
-- - --
-create function c_mode()
- returns text
- as 'update pg_type set typoutput=''c_charout'' where typname=''char''\;
- update pg_type set typoutput=''c_char2out'' where typname=''char2''\;
- update pg_type set typoutput=''c_char4out'' where typname=''char4''\;
- update pg_type set typoutput=''c_char8out'' where typname=''char8''\;
- update pg_type set typoutput=''c_char16out'' where typname=''char16''\;
- update pg_type set typoutput=''c_textout'' where typname=''text''\;
- update pg_type set typoutput=''c_textout'' where typname=''bytea''\;
- update pg_type set typoutput=''c_textout'' where typname=''unknown''\;
- update pg_type set typoutput=''c_textout'' where typname=''SET''\;
- update pg_type set typoutput=''c_varcharout'' where typname=''varchar''\;
- update pg_type set typoutput=''c_varcharout'' where typname=''bpchar''\;
- select ''c_mode''::text'
- language 'sql';
-
-- - -- define a function which restores the original routines for char types
-- - --
-- - -- select pg_mode();
-- - --
-create function pg_mode()
- returns text
- as 'update pg_type set typoutput=''charout'' where typname=''char''\;
- update pg_type set typoutput=''char2out'' where typname=''char2''\;
- update pg_type set typoutput=''char4out'' where typname=''char4''\;
- update pg_type set typoutput=''char8out'' where typname=''char8''\;
- update pg_type set typoutput=''char16out'' where typname=''char16''\;
- update pg_type set typoutput=''textout'' where typname=''text''\;
- update pg_type set typoutput=''textout'' where typname=''bytea''\;
- update pg_type set typoutput=''textout'' where typname=''unknown''\;
- update pg_type set typoutput=''textout'' where typname=''SET''\;
- update pg_type set typoutput=''varcharout'' where typname=''varchar''\;
- update pg_type set typoutput=''varcharout'' where typname=''bpchar''\;
- select ''pg_mode''::text'
- language 'sql';
-
-- - -- or do the changes manually
-- - --
-- - -- update pg_type set typoutput='charout' where typname='char';
-- - -- update pg_type set typoutput='char2out' where typname='char2';
-- - -- update pg_type set typoutput='char4out' where typname='char4';
-- - -- update pg_type set typoutput='char8out' where typname='char8';
-- - -- update pg_type set typoutput='char16out' where typname='char16';
-- - -- update pg_type set typoutput='textout' where typname='text';
-- - -- update pg_type set typoutput='textout' where typname='bytea';
-- - -- update pg_type set typoutput='textout' where typname='unknown';
-- - -- update pg_type set typoutput='textout' where typname='SET';
-- - -- update pg_type set typoutput='varcharout' where typname='varchar';
-- - -- update pg_type set typoutput='varcharout' where typname='bpchar';
-- - --
-- - -- update pg_type set typoutput='c_charout' where typname='char';
-- - -- update pg_type set typoutput='c_char2out' where typname='char2';
-- - -- update pg_type set typoutput='c_char4out' where typname='char4';
-- - -- update pg_type set typoutput='c_char8out' where typname='char8';
-- - -- update pg_type set typoutput='c_char16out' where typname='char16';
-- - -- update pg_type set typoutput='c_textout' where typname='text';
-- - -- update pg_type set typoutput='c_textout' where typname='bytea';
-- - -- update pg_type set typoutput='c_textout' where typname='unknown';
-- - -- update pg_type set typoutput='c_textout' where typname='SET';
-- - -- update pg_type set typoutput='c_varcharout' where typname='varchar';
-- - -- update pg_type set typoutput='c_varcharout' where typname='bpchar';
-
projects / postgresql / commitdiff