From 561818f2308e1f1325a944755cb126cf74d6f91a Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 4 Nov 1996 15:43:25 +0000
Subject: Wow!  Real buffering at last!

svn path=/trunk/; revision=477
---
 socket.c | 69 ++++++++++++++++++----------------------------------------------
 1 file changed, 19 insertions(+), 50 deletions(-)

(limited to 'socket.c')

diff --git a/socket.c b/socket.c
index 3dcdccaa..c4ef1513 100644
--- a/socket.c
+++ b/socket.c
@@ -24,6 +24,8 @@
 #endif
 #include "socket.h"
 
+#define  INTERNAL_BUFSIZE	2048
+
 FILE *Socket(host, clientPort)
 char *host;
 int clientPort;
@@ -32,7 +34,8 @@ int clientPort;
     unsigned long inaddr;
     struct sockaddr_in ad;
     struct hostent *hp;
-    
+    FILE *sockfp;
+
     memset(&ad, 0, sizeof(ad));
     ad.sin_family = AF_INET;
 
@@ -58,10 +61,11 @@ int clientPort;
         return (FILE *)NULL;
     }
 
-    return fdopen(sock, "r+");
+    sockfp = fdopen(sock, "r+");
+    setvbuf(sockfp, NULL, _IOLBF, INTERNAL_BUFSIZE);
+    return sockfp;
 }
 
-
 #if defined(HAVE_STDARG_H)
 int SockPrintf(FILE *sockfp, char* format, ...)
 {
@@ -86,45 +90,12 @@ va_dcl {
 
 }
 
-/*
- * FIXME: This needs to be recoded to use stdio, if that's possible.
- *
- * If you think these functions are too slow and inefficient, you're
- * absolutely right.  I wish I could figure out what to do about it.
- * The ancestral popclient used static buffering here to cut down on the
- * number of read(2) calls, but we can't do that because we can have
- * two or more sockets open at a time.
- *
- * The right thing to do would be to use stdio for internal per-socket
- * buffering here (which is why Socket() returns a file pointer) but 
- * this causes mysterious lossage.  In case someone ever finds a way
- * around this, a note on Carl Harris's original implementation said:
- *
- * Size of buffer for internal buffering read function 
- * don't increase beyond the maximum atomic read/write size for
- * your sockets, or you'll take a potentially huge performance hit
- *
- * #define  INTERNAL_BUFSIZE	2048
- *
- */
-
 int SockWrite(buf,len,sockfp)
 char *buf;
 int len;
 FILE *sockfp;
 {
-    int n, wrlen = 0;
-    
-    while (len)
-    {
-        n = write(fileno(sockfp), buf, len);
-        if (n <= 0)
-            return -1;
-        len -= n;
-	wrlen += n;
-	buf += n;
-    }
-    return wrlen;
+    return(fputs(buf, sockfp));
 }
 
 int SockGets(buf, len, sockfp)
@@ -132,21 +103,19 @@ char *buf;
 int len;
 FILE *sockfp;
 {
-    int rdlen = 0;
-
-    while (--len)
+    if (fgets(buf, len, sockfp) == (char *)NULL)
+	return(-1);
+    else
     {
-        if (read(fileno(sockfp), buf, 1) != 1)
-            return -1;
-        else
-	    rdlen++;
-        if (*buf == '\n')
-            break;
-        if (*buf != '\r') /* remove all CRs */
-            buf++;
+	char	*sp, *tp;
+
+	for (tp = sp = buf; *sp; sp++)
+	    if (*sp != '\r' && *sp != '\n')
+		*tp++ = *sp;
+	*tp++ = '\0';
+
+	return(strlen(buf));
     }
-    *buf = 0;
-    return rdlen;
 }
 
 /* socket.c ends here */
-- 
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