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Added functions
quote_ident(text) returns text
quote_literal(text) returns text
These are handy to build up properly quoted query strings
for the new PL/pgSQL EXECUTE functionality to submit
dynamic DDL statements.
Jan
This commit is contained in:
Jan Wieck
parent
d7f1e11026
commit
daf1e3a702
@ -1,7 +1,7 @@
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#
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# Makefile for utils/adt
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#
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# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.45 2000/08/31 16:10:45 petere Exp $
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# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.46 2000/09/05 20:25:12 wieck Exp $
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#
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subdir = src/backend/utils/adt
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@ -24,7 +24,7 @@ OBJS = acl.o arrayfuncs.o arrayutils.o bool.o cash.o char.o \
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tid.o timestamp.o varbit.o varchar.o varlena.o version.o \
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network.o mac.o inet_net_ntop.o inet_net_pton.o \
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ri_triggers.o pg_lzcompress.o pg_locale.o formatting.o \
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ascii.o
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ascii.o quote.o
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all: SUBSYS.o
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291
src/backend/utils/adt/quote.c
Normal file
291
src/backend/utils/adt/quote.c
Normal file
@ -0,0 +1,291 @@
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/*-------------------------------------------------------------------------
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*
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* quote.c
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* Functions for quoting identifiers and literals
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*
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* Portions Copyright (c) 2000, PostgreSQL, Inc
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/quote.c,v 1.1 2000/09/05 20:25:13 wieck Exp $
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*
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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 "mb/pg_wchar.h"
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#include "utils/builtins.h"
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static bool quote_ident_required(text *iptr);
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static text *do_quote_ident(text *iptr);
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static text *do_quote_literal(text *iptr);
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/*
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* quote_ident -
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* returns a properly quoted identifier
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*/
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Datum
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quote_ident(PG_FUNCTION_ARGS)
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{
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text *t = PG_GETARG_TEXT_P(0);
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text *result;
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if (quote_ident_required(t))
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{
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result = do_quote_ident(t);
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}
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else
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{
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result = (text *)palloc(VARSIZE(t));
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memcpy(result, t, VARSIZE(t));
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}
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PG_FREE_IF_COPY(t, 0);
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return result;
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}
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/*
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* quote_literal -
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* returns a properly quoted literal
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*/
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Datum
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quote_literal(PG_FUNCTION_ARGS)
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{
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text *t = PG_GETARG_TEXT_P(0);
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text *result;
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result = do_quote_literal(t);
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PG_FREE_IF_COPY(t, 0);
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return result;
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}
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/*
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* MULTIBYTE dependant internal functions follow
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*
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*/
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#ifndef MULTIBYTE
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/* Check if a given identifier needs quoting */
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static bool
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quote_ident_required(text *iptr)
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{
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char *cp;
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char *ep;
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cp = VARDATA(iptr);
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ep = VARDATA(iptr) + VARSIZE(iptr) - VARHDRSZ;
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if (cp >= ep)
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return true;
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if (!(*cp == '_' || (*cp >= 'a' && *cp <= 'z')))
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return true;
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while((++cp) < ep)
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{
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if (*cp >= 'a' && *cp <= 'z') continue;
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if (*cp >= '0' && *cp <= '9') continue;
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if (*cp == '_') continue;
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return true;
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}
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return false;
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}
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/* Return a properly quoted identifier */
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static text *
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do_quote_ident(text *iptr)
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{
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text *result;
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char *cp1;
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char *cp2;
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int len;
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len = VARSIZE(iptr) - VARHDRSZ;
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result = (text *)palloc(len * 2 + VARHDRSZ + 2);
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cp1 = VARDATA(iptr);
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cp2 = VARDATA(result);
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*cp2++ = '"';
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while(len-- > 0)
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{
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if (*cp1 == '"')
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*cp2++ = '"';
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if (*cp1 == '\\')
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*cp2++ = '\\';
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*cp2++ = *cp1++;
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}
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*cp2++ = '"';
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VARATT_SIZEP(result) = cp2 - ((char *)result);
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return result;
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}
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/* Return a properly quoted literal value */
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static text *
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do_quote_literal(text *lptr)
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{
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text *result;
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char *cp1;
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char *cp2;
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int len;
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len = VARSIZE(lptr) - VARHDRSZ;
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result = (text *)palloc(len * 2 + VARHDRSZ + 2);
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cp1 = VARDATA(lptr);
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cp2 = VARDATA(result);
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*cp2++ = '\'';
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while(len-- > 0)
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{
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if (*cp1 == '\'')
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*cp2++ = '\'';
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if (*cp1 == '\\')
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*cp2++ = '\\';
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*cp2++ = *cp1++;
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}
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*cp2++ = '\'';
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VARATT_SIZEP(result) = cp2 - ((char *)result);
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return result;
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}
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#else
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/* Check if a given identifier needs quoting (MULTIBYTE version) */
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static bool
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quote_ident_required(text *iptr)
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{
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char *cp;
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char *ep;
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cp = VARDATA(iptr);
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ep = VARDATA(iptr) + VARSIZE(iptr) - VARHDRSZ;
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if (cp >= ep)
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return true;
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if(pg_mblen(cp) != 1)
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return true;
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if (!(*cp == '_' || (*cp >= 'a' && *cp <= 'z')))
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return true;
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while((++cp) < ep)
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{
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if (pg_mblen(cp) != 1)
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return true;
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if (*cp >= 'a' && *cp <= 'z') continue;
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if (*cp >= '0' && *cp <= '9') continue;
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if (*cp == '_') continue;
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return true;
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}
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return false;
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}
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/* Return a properly quoted identifier (MULTIBYTE version) */
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static text *
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do_quote_ident(text *iptr)
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{
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text *result;
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char *cp1;
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char *cp2;
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int len;
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int wl;
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len = VARSIZE(iptr) - VARHDRSZ;
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result = (text *)palloc(len * 2 + VARHDRSZ + 2);
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cp1 = VARDATA(iptr);
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cp2 = VARDATA(result);
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*cp2++ = '"';
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while(len > 0)
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{
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if ((wl = pg_mblen(cp1)) != 1)
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{
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len -= wl;
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while(wl-- > 0)
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*cp2++ = *cp1++;
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continue;
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}
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if (*cp1 == '"')
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*cp2++ = '"';
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if (*cp1 == '\\')
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*cp2++ = '\\';
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*cp2++ = *cp1++;
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len--;
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}
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*cp2++ = '"';
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VARATT_SIZEP(result) = cp2 - ((char *)result);
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return result;
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}
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/* Return a properly quoted literal value (MULTIBYTE version) */
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static text *
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do_quote_literal(text *lptr)
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{
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text *result;
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char *cp1;
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char *cp2;
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int len;
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int wl;
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len = VARSIZE(lptr) - VARHDRSZ;
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result = (text *)palloc(len * 2 + VARHDRSZ + 2);
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cp1 = VARDATA(lptr);
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cp2 = VARDATA(result);
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*cp2++ = '\'';
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while(len > 0)
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{
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if ((wl = pg_mblen(cp1)) != 1)
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{
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len -= wl;
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while(wl-- > 0)
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*cp2++ = *cp1++;
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continue;
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}
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if (*cp1 == '\'')
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*cp2++ = '\'';
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if (*cp1 == '\\')
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*cp2++ = '\\';
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*cp2++ = *cp1++;
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len--;
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}
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*cp2++ = '\'';
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VARATT_SIZEP(result) = cp2 - ((char *)result);
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return result;
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}
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#endif
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pg_proc.h,v 1.164 2000/08/24 03:29:08 tgl Exp $
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* $Id: pg_proc.h,v 1.165 2000/09/05 20:25:13 wieck Exp $
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*
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* NOTES
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* The script catalog/genbki.sh reads this file and generates .bki
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@ -2409,6 +2409,11 @@ DESCR("convert text to timestamp");
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DATA(insert OID = 1780 ( to_date PGUID 12 f t f t 2 f 1082 "25 25" 100 0 0 100 to_date - ));
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DESCR("convert text to date");
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DATA(insert OID = 1282 ( quote_ident PGUID 12 f t t t 1 f 25 "25" 100 0 0 100 quote_ident - ));
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DESCR("quote an identifier for usage in a querystring");
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DATA(insert OID = 1283 ( quote_literal PGUID 12 f t t t 1 f 25 "25" 100 0 0 100 quote_literal - ));
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DESCR("quote a literal for usage in a querystring");
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DATA(insert OID = 1798 ( oidin PGUID 12 f t t t 1 f 26 "0" 100 0 0 100 oidin - ));
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DESCR("(internal)");
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DATA(insert OID = 1799 ( oidout PGUID 12 f t t t 1 f 23 "0" 100 0 0 100 oidout - ));
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: builtins.h,v 1.135 2000/08/25 18:05:53 tgl Exp $
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* $Id: builtins.h,v 1.136 2000/09/05 20:25:14 wieck Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -585,4 +585,8 @@ extern Datum format_type(PG_FUNCTION_ARGS);
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extern Datum oidvectortypes(PG_FUNCTION_ARGS);
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extern int32 type_maximum_size(Oid type_oid, int32 typemod);
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/* quote.c */
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extern Datum quote_ident(PG_FUNCTION_ARGS);
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extern Datum quote_literal(PG_FUNCTION_ARGS);
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#endif /* BUILTINS_H */
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