diff options
| author | Daniel Gustafsson <dgustafsson@postgresql.org> | 2023-11-06 09:38:29 +0100 |
|---|---|---|
| committer | Daniel Gustafsson <dgustafsson@postgresql.org> | 2023-11-06 09:38:29 +0100 |
| commit | 526fe0d79914b2dfcfd79effd1ab26ff62469248 (patch) | |
| tree | 7d25dbd45a49eeba488ae7d1f57520babda7e336 /src/backend/utils/adt/xml.c | |
| parent | 7b5275eec3a50d55f5750357b8a223cf5f0bb59f (diff) | |
| download | postgresql-526fe0d79914b2dfcfd79effd1ab26ff62469248.tar.gz postgresql-526fe0d79914b2dfcfd79effd1ab26ff62469248.zip | |
Add XMLText function (SQL/XML X038)
This function implements the standard XMLTest function, which
converts text into xml text nodes. It uses the libxml2 function
xmlEncodeSpecialChars to escape predefined entities (&"<>), so
that those do not cause any conflict when concatenating the text
node output with existing xml documents.
This also adds a note in features.sgml about not supporting
XML(SEQUENCE). The SQL specification defines a RETURNING clause
to a set of XML functions, where RETURNING CONTENT or RETURNING
SEQUENCE can be defined. Since PostgreSQL doesn't support
XML(SEQUENCE) all of these functions operate with an
implicit RETURNING CONTENT.
Author: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://postgr.es/m/86617a66-ec95-581f-8d54-08059cca8885@uni-muenster.de
Diffstat (limited to 'src/backend/utils/adt/xml.c')
| -rw-r--r-- | src/backend/utils/adt/xml.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/backend/utils/adt/xml.c b/src/backend/utils/adt/xml.c index 2300c7ebf34..c401e7b8219 100644 --- a/src/backend/utils/adt/xml.c +++ b/src/backend/utils/adt/xml.c @@ -47,6 +47,7 @@ #ifdef USE_LIBXML #include <libxml/chvalid.h> +#include <libxml/entities.h> #include <libxml/parser.h> #include <libxml/parserInternals.h> #include <libxml/tree.h> @@ -513,6 +514,27 @@ xmlcomment(PG_FUNCTION_ARGS) } +Datum +xmltext(PG_FUNCTION_ARGS) +{ +#ifdef USE_LIBXML + text *arg = PG_GETARG_TEXT_PP(0); + text *result; + xmlChar *xmlbuf = NULL; + + xmlbuf = xmlEncodeSpecialChars(NULL, xml_text2xmlChar(arg)); + + Assert(xmlbuf); + + result = cstring_to_text_with_len((const char *) xmlbuf, xmlStrlen(xmlbuf)); + xmlFree(xmlbuf); + PG_RETURN_XML_P(result); +#else + NO_XML_SUPPORT(); + return 0; +#endif /* not USE_LIBXML */ +} + /* * TODO: xmlconcat needs to merge the notations and unparsed entities |