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Commite9da20a

Browse files
committed
Fix machine-dependent crash in sqlchar_to_unicode(). Get rid of
bletcherous and unsafe manipulation of global encoding setting.Clean up libxml reporting mechanism a bit (it still looks like adangling-pointer crash waiting to happen, though, not to mentionbeing far less than sane from a localization standpoint).
1 parentc957c0b commite9da20a

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3 files changed

+30
-22
lines changed

3 files changed

+30
-22
lines changed

‎src/backend/utils/adt/xml.c‎

Lines changed: 18 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.3 2006/12/24 00:29:19 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.4 2006/12/24 00:57:48 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -42,7 +42,6 @@
4242
#ifdefUSE_LIBXML
4343

4444
#definePG_XML_DEFAULT_URI "dummy.xml"
45-
#defineXML_ERRBUF_SIZE 200
4645

4746

4847
staticvoidxml_init(void);
@@ -60,8 +59,7 @@ static xmlDocPtr xml_parse(text *data, int opts, bool is_document);
6059
/* Global variables */
6160
/* taken from contrib/xml2 */
6261
/* FIXME: DO NOT USE global vars !!! */
63-
char*xml_errbuf;/* per line error buffer */
64-
char*xml_errmsg=NULL;/* overall error message */
62+
staticchar*xml_errmsg=NULL;/* overall error message */
6563

6664
#endif/* USE_LIBXML */
6765

@@ -376,8 +374,6 @@ xml_init(void)
376374
/* do not flood PG's logfile with libxml error messages - reset error handler*/
377375
xmlSetGenericErrorFunc(NULL,xml_errorHandler);
378376
xml_errmsg=NULL;
379-
xml_errbuf=palloc(XML_ERRBUF_SIZE);
380-
memset(xml_errbuf,0,XML_ERRBUF_SIZE);
381377
}
382378

383379

@@ -563,6 +559,7 @@ xml_ereport(int level, char *msg, void *ctxt)
563559
{
564560
ereport(DEBUG1, (errmsg("%s",xml_errmsg)));
565561
pfree(xml_errmsg);
562+
xml_errmsg=NULL;
566563
}
567564

568565
if (ctxt!=NULL)
@@ -605,23 +602,26 @@ xml_ereport(int level, char *msg, void *ctxt)
605602
staticvoid
606603
xml_errorHandler(void*ctxt,constchar*msg,...)
607604
{
605+
charxml_errbuf[256];
608606
va_listargs;
609607

608+
/* Format this message ... */
610609
va_start(args,msg);
611-
vsnprintf(xml_errbuf,XML_ERRBUF_SIZE,msg,args);
610+
vsnprintf(xml_errbuf,sizeof(xml_errbuf)-1,msg,args);
612611
va_end(args);
613-
/* Now copy the argument across */
612+
xml_errbuf[sizeof(xml_errbuf)-1]='\0';
613+
614+
/* ... and append to xml_errbuf */
614615
if (xml_errmsg==NULL)
615616
xml_errmsg=pstrdup(xml_errbuf);
616617
else
617618
{
618619
int32xsize=strlen(xml_errmsg);
619620

620-
xml_errmsg=repalloc(xml_errmsg, (size_t) (xsize+strlen(xml_errbuf)+1));
621-
strncpy(&xml_errmsg[xsize-1],xml_errbuf,strlen(xml_errbuf));
622-
xml_errmsg[xsize+strlen(xml_errbuf)-1]='\0';
621+
xml_errmsg=repalloc(xml_errmsg,
622+
(size_t) (xsize+strlen(xml_errbuf)+1));
623+
strcpy(&xml_errmsg[xsize-1],xml_errbuf);
623624
}
624-
memset(xml_errbuf,0,XML_ERRBUF_SIZE);
625625
}
626626

627627

@@ -800,13 +800,15 @@ xml_ereport_by_code(int level, char *msg, int code)
800800
break;
801801
default:
802802
det="Unregistered error (libxml error code: %d)";
803-
ereport(DEBUG1, (errmsg("Check out \"libxml/xmlerror.h\" and bring errcode \"%d\" processing to \"xml.c\".",code)));
803+
ereport(DEBUG1,
804+
(errmsg_internal("Check out \"libxml/xmlerror.h\" and bring errcode \"%d\" processing to \"xml.c\".",code)));
804805
}
805806

806807
if (xml_errmsg!=NULL)
807808
{
808809
ereport(DEBUG1, (errmsg("%s",xml_errmsg)));
809810
pfree(xml_errmsg);
811+
xml_errmsg=NULL;
810812
}
811813

812814
ereport(level, (errmsg(msg),errdetail(det,code)));
@@ -820,21 +822,17 @@ xml_ereport_by_code(int level, char *msg, int code)
820822
staticpg_wchar
821823
sqlchar_to_unicode(char*s)
822824
{
823-
intsave_enc;
824-
pg_wcharret;
825825
char*utf8string;
826+
pg_wcharret[2];/* need space for trailing zero */
826827

827828
utf8string= (char*)pg_do_encoding_conversion((unsignedchar*)s,
828829
pg_mblen(s),
829830
GetDatabaseEncoding(),
830831
PG_UTF8);
831832

832-
save_enc=GetDatabaseEncoding();
833-
SetDatabaseEncoding(PG_UTF8);
834-
pg_mb2wchar_with_len(utf8string,&ret,pg_mblen(s));
835-
SetDatabaseEncoding(save_enc);
833+
pg_encoding_mb2wchar_with_len(PG_UTF8,utf8string,ret,pg_mblen(s));
836834

837-
returnret;
835+
returnret[0];
838836
}
839837

840838

‎src/backend/utils/mb/mbutils.c‎

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
44
* (currently mule internal code (mic) is used)
55
* Tatsuo Ishii
66
*
7-
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.60 2006/12/21 16:05:15 petere Exp $
7+
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.61 2006/12/24 00:57:48 tgl Exp $
88
*/
99
#include"postgres.h"
1010

@@ -483,6 +483,14 @@ pg_mb2wchar_with_len(const char *from, pg_wchar *to, int len)
483483
return (*pg_wchar_table[DatabaseEncoding->encoding].mb2wchar_with_len) ((constunsignedchar*)from,to,len);
484484
}
485485

486+
/* same, with any encoding */
487+
int
488+
pg_encoding_mb2wchar_with_len(intencoding,
489+
constchar*from,pg_wchar*to,intlen)
490+
{
491+
return (*pg_wchar_table[encoding].mb2wchar_with_len) ((constunsignedchar*)from,to,len);
492+
}
493+
486494
/* returns the byte length of a multibyte word */
487495
int
488496
pg_mblen(constchar*mbstr)

‎src/include/mb/pg_wchar.h‎

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
/* $PostgreSQL: pgsql/src/include/mb/pg_wchar.h,v 1.69 2006/10/04 00:30:09 momjian Exp $ */
1+
/* $PostgreSQL: pgsql/src/include/mb/pg_wchar.h,v 1.70 2006/12/24 00:57:48 tgl Exp $ */
22

33
#ifndefPG_WCHAR_H
44
#definePG_WCHAR_H
@@ -293,6 +293,8 @@ typedef struct
293293

294294
externintpg_mb2wchar(constchar*from,pg_wchar*to);
295295
externintpg_mb2wchar_with_len(constchar*from,pg_wchar*to,intlen);
296+
externintpg_encoding_mb2wchar_with_len(intencoding,
297+
constchar*from,pg_wchar*to,intlen);
296298
externintpg_char_and_wchar_strcmp(constchar*s1,constpg_wchar*s2);
297299
externintpg_wchar_strncmp(constpg_wchar*s1,constpg_wchar*s2,size_tn);
298300
externintpg_char_and_wchar_strncmp(constchar*s1,constpg_wchar*s2,size_tn);

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