From: Wilfried Göesgens <willi@citadel.org>
Date: Sun, 31 May 2009 22:46:15 +0000 (+0000)
Subject: * add function to shrink empty StrBufs so they don't permanently alloc unneeded sizes.
X-Git-Tag: v7.86~1113
X-Git-Url: https://code.citadel.org/?a=commitdiff_plain;h=193c2c8366b85b35f307331d4d2cb43d9e10dfb5;p=citadel.git

* add function to shrink empty StrBufs so they don't permanently alloc unneeded sizes.
---

diff --git a/libcitadel/lib/libcitadel.h b/libcitadel/lib/libcitadel.h
index 4c378b9fa..132c49f09 100644
--- a/libcitadel/lib/libcitadel.h
+++ b/libcitadel/lib/libcitadel.h
@@ -223,6 +223,7 @@ StrBuf* NewStrBuf(void);
 StrBuf* NewStrBufDup(const StrBuf *CopyMe);
 StrBuf* NewStrBufPlain(const char* ptr, int nChars);
 long StrBufShrinkToFit(StrBuf *Buf, int Force);
+void ReAdjustEmptyBuf(StrBuf *Buf, long ThreshHold, long NewSize);
 
 int StrBufPlain(StrBuf *Buf, const char* ptr, int nChars);
 StrBuf* _NewConstStrBuf(const char* StringConstant, size_t SizeOfStrConstant);
diff --git a/libcitadel/lib/stringbuf.c b/libcitadel/lib/stringbuf.c
index 3759ecccc..dc180176e 100644
--- a/libcitadel/lib/stringbuf.c
+++ b/libcitadel/lib/stringbuf.c
@@ -138,6 +138,22 @@ static int IncreaseBuf(StrBuf *Buf, int KeepOriginal, int DestSize)
 	return Buf->BufSize;
 }
 
+/**
+ * \brief shrink an _EMPTY_ buffer if its Buffer superseeds threshhold to NewSize. Buffercontent is thoroughly ignored and flushed.
+ * \param Buf Buffer to shrink (has to be empty)
+ * \param ThreshHold if the buffer is bigger then this, its readjusted
+ * \param NewSize if we Shrink it, how big are we going to be afterwards?
+ */
+void ReAdjustEmptyBuf(StrBuf *Buf, long ThreshHold, long NewSize)
+{
+	if (Buf->BufUsed > ThreshHold) {
+		free(Buf->buf);
+		Buf->buf = (char*) malloc(NewSize);
+		Buf->BufUsed = 0;
+		Buf->BufSize = NewSize;
+	}
+}
+
 /**
  * \brief shrink long term buffers to their real size so they don't waste memory
  * \param Buf buffer to shrink