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Suppress useless memmove() when buffer already contains left-justified

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This commit is contained in:
Tom Lane 2001-05-28 15:29:51 +00:00
parent 3fdfce6839
commit 2ba48262b9
1 changed files with 12 additions and 6 deletions

18
src/interfaces/libpq/fe-misc.c

@ -25,7 +25,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.48 2001/03/31 23:13:30 tgl Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.49 2001/05/28 15:29:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -400,14 +400,20 @@ pqReadData(PGconn *conn)
/* Left-justify any data in the buffer to make room */
if (conn->inStart < conn->inEnd)
{
memmove(conn->inBuffer, conn->inBuffer + conn->inStart,
conn->inEnd - conn->inStart);
conn->inEnd -= conn->inStart;
conn->inCursor -= conn->inStart;
conn->inStart = 0;
if (conn->inStart > 0)
{
memmove(conn->inBuffer, conn->inBuffer + conn->inStart,
conn->inEnd - conn->inStart);
conn->inEnd -= conn->inStart;
conn->inCursor -= conn->inStart;
conn->inStart = 0;
}
}
else
{
/* buffer is logically empty, reset it */
conn->inStart = conn->inCursor = conn->inEnd = 0;
}
/*
* If the buffer is fairly full, enlarge it. We need to be able to