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Commitb783186

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Add destroyStringInfo function for cleaning up StringInfos
destroyStringInfo() is a counterpart to makeStringInfo(), freeing apalloc'd StringInfo and its data. This is a convenience function toalign the StringInfo API with the PQExpBuffer API. Originally addedin the OAuth patchset, it was extracted and committed separately inorder to aid upcoming JSON work.Author: Daniel Gustafsson <daniel@yesql.se>Author: Jacob Champion <jacob.champion@enterprisedb.com>Reviewed-by: Michael Paquier <michael@paquier.xyz>Discussion:https://postgr.es/m/CAOYmi+mWdTd6ujtyF7MsvXvk7ToLRVG_tYAcaGbQLvf=N4KrQw@mail.gmail.com
1 parent927332b commitb783186

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8 files changed

+31
-17
lines changed

8 files changed

+31
-17
lines changed

‎src/backend/backup/basebackup.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -397,8 +397,7 @@ perform_base_backup(basebackup_options *opt, bbsink *sink,
397397
endtli=backup_state->stoptli;
398398

399399
/* Deallocate backup-related variables. */
400-
pfree(tablespace_map->data);
401-
pfree(tablespace_map);
400+
destroyStringInfo(tablespace_map);
402401
pfree(backup_state);
403402
}
404403
PG_END_ENSURE_ERROR_CLEANUP(do_pg_abort_backup,BoolGetDatum(false));

‎src/backend/commands/subscriptioncmds.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -506,8 +506,7 @@ check_publications(WalReceiverConn *wrconn, List *publications)
506506
appendStringInfoChar(cmd,')');
507507

508508
res=walrcv_exec(wrconn,cmd->data,1,tableRow);
509-
pfree(cmd->data);
510-
pfree(cmd);
509+
destroyStringInfo(cmd);
511510

512511
if (res->status!=WALRCV_OK_TUPLES)
513512
ereport(ERROR,

‎src/backend/utils/adt/jsonb.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -133,8 +133,7 @@ jsonb_send(PG_FUNCTION_ARGS)
133133
pq_begintypsend(&buf);
134134
pq_sendint8(&buf,version);
135135
pq_sendtext(&buf,jtext->data,jtext->len);
136-
pfree(jtext->data);
137-
pfree(jtext);
136+
destroyStringInfo(jtext);
138137

139138
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
140139
}

‎src/backend/utils/adt/xml.c‎

Lines changed: 2 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -2163,8 +2163,7 @@ xml_errorHandler(void *data, PgXmlErrorPtr error)
21632163
appendBinaryStringInfo(&xmlerrcxt->err_buf,errorBuf->data,
21642164
errorBuf->len);
21652165

2166-
pfree(errorBuf->data);
2167-
pfree(errorBuf);
2166+
destroyStringInfo(errorBuf);
21682167
return;
21692168
}
21702169

@@ -2195,8 +2194,7 @@ xml_errorHandler(void *data, PgXmlErrorPtr error)
21952194
(errmsg_internal("%s",errorBuf->data)));
21962195
}
21972196

2198-
pfree(errorBuf->data);
2199-
pfree(errorBuf);
2197+
destroyStringInfo(errorBuf);
22002198
}
22012199

22022200

‎src/bin/pg_combinebackup/pg_combinebackup.c‎

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -526,10 +526,7 @@ check_backup_label_files(int n_backups, char **backup_dirs)
526526

527527
/* Free memory that we don't need any more. */
528528
if (lastbuf!=buf)
529-
{
530-
pfree(buf->data);
531-
pfree(buf);
532-
}
529+
destroyStringInfo(buf);
533530

534531
/*
535532
* Return the data from the first backup_info that we read (which is the

‎src/common/stringinfo.c‎

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -350,3 +350,19 @@ enlargeStringInfo(StringInfo str, int needed)
350350

351351
str->maxlen=newlen;
352352
}
353+
354+
/*
355+
* destroyStringInfo
356+
*
357+
* Frees a StringInfo and its buffer (opposite of makeStringInfo()).
358+
* This must only be called on palloc'd StringInfos.
359+
*/
360+
void
361+
destroyStringInfo(StringInfostr)
362+
{
363+
/* don't allow destroys of read-only StringInfos */
364+
Assert(str->maxlen!=0);
365+
366+
pfree(str->data);
367+
pfree(str);
368+
}

‎src/include/lib/stringinfo.h‎

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -87,7 +87,8 @@ typedef StringInfoData *StringInfo;
8787
*to be len + 1 in size.
8888
*
8989
* To destroy a StringInfo, pfree() the data buffer, and then pfree() the
90-
* StringInfoData if it was palloc'd. There's no special support for this.
90+
* StringInfoData if it was palloc'd. For StringInfos created with
91+
* makeStringInfo(), destroyStringInfo() is provided for this purpose.
9192
* However, if the StringInfo was initialized using initReadOnlyStringInfo()
9293
* then the caller will need to consider if it is safe to pfree the data
9394
* buffer.
@@ -233,4 +234,10 @@ extern void appendBinaryStringInfoNT(StringInfo str,
233234
*/
234235
externvoidenlargeStringInfo(StringInfostr,intneeded);
235236

237+
/*------------------------
238+
* destroyStringInfo
239+
* Frees a StringInfo and its buffer (opposite of makeStringInfo()).
240+
*/
241+
externvoiddestroyStringInfo(StringInfostr);
242+
236243
#endif/* STRINGINFO_H */

‎src/test/regress/pg_regress.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1174,8 +1174,7 @@ psql_end_command(StringInfo buf, const char *database)
11741174
}
11751175

11761176
/* Clean up */
1177-
pfree(buf->data);
1178-
pfree(buf);
1177+
destroyStringInfo(buf);
11791178
}
11801179

11811180
/*

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