From daf1e3a7026e367d630be3ac34ac0a9e7cf1340f Mon Sep 17 00:00:00 2001
From: Jan Wieck <JanWieck@Yahoo.com>
Date: Tue, 5 Sep 2000 20:25:14 +0000
Subject: [PATCH] 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
---
src/backend/utils/adt/Makefile | 4 +-
src/backend/utils/adt/quote.c | 291 +++++++++++++++++++++++++++++++++
src/include/catalog/pg_proc.h | 7 +-
src/include/utils/builtins.h | 6 +-
4 files changed, 304 insertions(+), 4 deletions(-)
create mode 100644 src/backend/utils/adt/quote.c
diff --git a/src/backend/utils/adt/Makefile b/src/backend/utils/adt/Makefile
index 62ec9bcb87f..40e70c19cc7 100644
--- a/src/backend/utils/adt/Makefile
+++ b/src/backend/utils/adt/Makefile
@@ -1,7 +1,7 @@
#
# Makefile for utils/adt
#
-# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.45 2000/08/31 16:10:45 petere Exp $
+# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.46 2000/09/05 20:25:12 wieck Exp $
#
subdir = src/backend/utils/adt
@@ -24,7 +24,7 @@ OBJS = acl.o arrayfuncs.o arrayutils.o bool.o cash.o char.o \
tid.o timestamp.o varbit.o varchar.o varlena.o version.o \
network.o mac.o inet_net_ntop.o inet_net_pton.o \
ri_triggers.o pg_lzcompress.o pg_locale.o formatting.o \
- ascii.o
+ ascii.o quote.o
all: SUBSYS.o
diff --git a/src/backend/utils/adt/quote.c b/src/backend/utils/adt/quote.c
new file mode 100644
index 00000000000..aaa4aaaa1b8
--- /dev/null
+++ b/src/backend/utils/adt/quote.c
@@ -0,0 +1,291 @@
+/*-------------------------------------------------------------------------
+ *
+ * quote.c
+ * Functions for quoting identifiers and literals
+ *
+ * Portions Copyright (c) 2000, PostgreSQL, Inc
+ *
+ *
+ * IDENTIFICATION
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/quote.c,v 1.1 2000/09/05 20:25:13 wieck Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include <ctype.h>
+
+#include "postgres.h"
+
+#include "mb/pg_wchar.h"
+#include "utils/builtins.h"
+
+
+static bool quote_ident_required(text *iptr);
+static text *do_quote_ident(text *iptr);
+static text *do_quote_literal(text *iptr);
+
+
+/*
+ * quote_ident -
+ * returns a properly quoted identifier
+ */
+Datum
+quote_ident(PG_FUNCTION_ARGS)
+{
+ text *t = PG_GETARG_TEXT_P(0);
+ text *result;
+
+ if (quote_ident_required(t))
+ {
+ result = do_quote_ident(t);
+ }
+ else
+ {
+ result = (text *)palloc(VARSIZE(t));
+ memcpy(result, t, VARSIZE(t));
+ }
+
+ PG_FREE_IF_COPY(t, 0);
+
+ return result;
+}
+
+/*
+ * quote_literal -
+ * returns a properly quoted literal
+ */
+Datum
+quote_literal(PG_FUNCTION_ARGS)
+{
+ text *t = PG_GETARG_TEXT_P(0);
+ text *result;
+
+ result = do_quote_literal(t);
+
+ PG_FREE_IF_COPY(t, 0);
+
+ return result;
+}
+
+
+/*
+ * MULTIBYTE dependant internal functions follow
+ *
+ */
+
+
+#ifndef MULTIBYTE
+
+/* Check if a given identifier needs quoting */
+static bool
+quote_ident_required(text *iptr)
+{
+ char *cp;
+ char *ep;
+
+ cp = VARDATA(iptr);
+ ep = VARDATA(iptr) + VARSIZE(iptr) - VARHDRSZ;
+
+ if (cp >= ep)
+ return true;
+
+ if (!(*cp == '_' || (*cp >= 'a' && *cp <= 'z')))
+ return true;
+
+ while((++cp) < ep)
+ {
+ if (*cp >= 'a' && *cp <= 'z') continue;
+ if (*cp >= '0' && *cp <= '9') continue;
+ if (*cp == '_') continue;
+
+ return true;
+ }
+
+ return false;
+}
+
+/* Return a properly quoted identifier */
+static text *
+do_quote_ident(text *iptr)
+{
+ text *result;
+ char *cp1;
+ char *cp2;
+ int len;
+
+ len = VARSIZE(iptr) - VARHDRSZ;
+ result = (text *)palloc(len * 2 + VARHDRSZ + 2);
+
+ cp1 = VARDATA(iptr);
+ cp2 = VARDATA(result);
+
+ *cp2++ = '"';
+ while(len-- > 0)
+ {
+ if (*cp1 == '"')
+ *cp2++ = '"';
+ if (*cp1 == '\\')
+ *cp2++ = '\\';
+ *cp2++ = *cp1++;
+ }
+ *cp2++ = '"';
+
+ VARATT_SIZEP(result) = cp2 - ((char *)result);
+
+ return result;
+}
+
+/* Return a properly quoted literal value */
+static text *
+do_quote_literal(text *lptr)
+{
+ text *result;
+ char *cp1;
+ char *cp2;
+ int len;
+
+ len = VARSIZE(lptr) - VARHDRSZ;
+ result = (text *)palloc(len * 2 + VARHDRSZ + 2);
+
+ cp1 = VARDATA(lptr);
+ cp2 = VARDATA(result);
+
+ *cp2++ = '\'';
+ while(len-- > 0)
+ {
+ if (*cp1 == '\'')
+ *cp2++ = '\'';
+ if (*cp1 == '\\')
+ *cp2++ = '\\';
+ *cp2++ = *cp1++;
+ }
+ *cp2++ = '\'';
+
+ VARATT_SIZEP(result) = cp2 - ((char *)result);
+
+ return result;
+}
+
+#else
+
+/* Check if a given identifier needs quoting (MULTIBYTE version) */
+static bool
+quote_ident_required(text *iptr)
+{
+ char *cp;
+ char *ep;
+
+ cp = VARDATA(iptr);
+ ep = VARDATA(iptr) + VARSIZE(iptr) - VARHDRSZ;
+
+ if (cp >= ep)
+ return true;
+
+ if(pg_mblen(cp) != 1)
+ return true;
+ if (!(*cp == '_' || (*cp >= 'a' && *cp <= 'z')))
+ return true;
+
+ while((++cp) < ep)
+ {
+ if (pg_mblen(cp) != 1)
+ return true;
+
+ if (*cp >= 'a' && *cp <= 'z') continue;
+ if (*cp >= '0' && *cp <= '9') continue;
+ if (*cp == '_') continue;
+
+ return true;
+ }
+
+ return false;
+}
+
+/* Return a properly quoted identifier (MULTIBYTE version) */
+static text *
+do_quote_ident(text *iptr)
+{
+ text *result;
+ char *cp1;
+ char *cp2;
+ int len;
+ int wl;
+
+ len = VARSIZE(iptr) - VARHDRSZ;
+ result = (text *)palloc(len * 2 + VARHDRSZ + 2);
+
+ cp1 = VARDATA(iptr);
+ cp2 = VARDATA(result);
+
+ *cp2++ = '"';
+ while(len > 0)
+ {
+ if ((wl = pg_mblen(cp1)) != 1)
+ {
+ len -= wl;
+
+ while(wl-- > 0)
+ *cp2++ = *cp1++;
+ continue;
+ }
+
+ if (*cp1 == '"')
+ *cp2++ = '"';
+ if (*cp1 == '\\')
+ *cp2++ = '\\';
+ *cp2++ = *cp1++;
+
+ len--;
+ }
+ *cp2++ = '"';
+
+ VARATT_SIZEP(result) = cp2 - ((char *)result);
+
+ return result;
+}
+
+/* Return a properly quoted literal value (MULTIBYTE version) */
+static text *
+do_quote_literal(text *lptr)
+{
+ text *result;
+ char *cp1;
+ char *cp2;
+ int len;
+ int wl;
+
+ len = VARSIZE(lptr) - VARHDRSZ;
+ result = (text *)palloc(len * 2 + VARHDRSZ + 2);
+
+ cp1 = VARDATA(lptr);
+ cp2 = VARDATA(result);
+
+ *cp2++ = '\'';
+ while(len > 0)
+ {
+ if ((wl = pg_mblen(cp1)) != 1)
+ {
+ len -= wl;
+
+ while(wl-- > 0)
+ *cp2++ = *cp1++;
+ continue;
+ }
+
+ if (*cp1 == '\'')
+ *cp2++ = '\'';
+ if (*cp1 == '\\')
+ *cp2++ = '\\';
+ *cp2++ = *cp1++;
+
+ len--;
+ }
+ *cp2++ = '\'';
+
+ VARATT_SIZEP(result) = cp2 - ((char *)result);
+
+ return result;
+}
+
+#endif
+
+
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index c7e092c7020..04109473d8e 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: pg_proc.h,v 1.164 2000/08/24 03:29:08 tgl Exp $
+ * $Id: pg_proc.h,v 1.165 2000/09/05 20:25:13 wieck Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
@@ -2409,6 +2409,11 @@ DESCR("convert text to timestamp");
DATA(insert OID = 1780 ( to_date PGUID 12 f t f t 2 f 1082 "25 25" 100 0 0 100 to_date - ));
DESCR("convert text to date");
+DATA(insert OID = 1282 ( quote_ident PGUID 12 f t t t 1 f 25 "25" 100 0 0 100 quote_ident - ));
+DESCR("quote an identifier for usage in a querystring");
+DATA(insert OID = 1283 ( quote_literal PGUID 12 f t t t 1 f 25 "25" 100 0 0 100 quote_literal - ));
+DESCR("quote a literal for usage in a querystring");
+
DATA(insert OID = 1798 ( oidin PGUID 12 f t t t 1 f 26 "0" 100 0 0 100 oidin - ));
DESCR("(internal)");
DATA(insert OID = 1799 ( oidout PGUID 12 f t t t 1 f 23 "0" 100 0 0 100 oidout - ));
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h
index 2c42899b1c0..cbb0aabe498 100644
--- a/src/include/utils/builtins.h
+++ b/src/include/utils/builtins.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: builtins.h,v 1.135 2000/08/25 18:05:53 tgl Exp $
+ * $Id: builtins.h,v 1.136 2000/09/05 20:25:14 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@@ -585,4 +585,8 @@ extern Datum format_type(PG_FUNCTION_ARGS);
extern Datum oidvectortypes(PG_FUNCTION_ARGS);
extern int32 type_maximum_size(Oid type_oid, int32 typemod);
+/* quote.c */
+extern Datum quote_ident(PG_FUNCTION_ARGS);
+extern Datum quote_literal(PG_FUNCTION_ARGS);
+
#endif /* BUILTINS_H */
--
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