From 9b699b1aebb24f4f42b0c8b89a497339fc1e1499 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 4 Nov 1996 22:56:43 +0000
Subject: Insert fseeks to prevent read-write lossage.

svn path=/trunk/; revision=485
---
 driver.c | 12 ++++++++++--
 imap.c   |  5 +++++
 pop3.c   |  2 ++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/driver.c b/driver.c
index 9eee8807..46b2a153 100644
--- a/driver.c
+++ b/driver.c
@@ -789,6 +789,14 @@ struct query *ctl;	/* query control record */
 	lines++;
     }
 
+    /*
+     * Required by Standard C and the Linux stdio library,
+     * which wants a seek between read and write operations on a
+     * read/write stream.  Without this we got weird lossage
+     * trying to issue delete commands after reading a long message.
+     */
+    fseek(sockfp, 0L, SEEK_CUR);
+
     if (ctl->mda[0])
     {
 	/* close the delivery pipe, we'll reopen before next message */
@@ -1118,7 +1126,7 @@ va_dcl {
     va_end(ap);
 
     strcat(buf, "\r\n");
-    fputs(buf, sockfp);
+    fputs(buf, sockfp); fseek(sockfp, 0L, SEEK_CUR);
 
     if (outlevel == O_VERBOSE)
     {
@@ -1160,7 +1168,7 @@ va_dcl {
   va_end(ap);
 
   strcat(buf, "\r\n");
-  fputs(buf, sockfp);
+  fputs(buf, sockfp); fseek(sockfp, 0L, SEEK_CUR);
   if (outlevel == O_VERBOSE)
   {
       char *cp;
diff --git a/imap.c b/imap.c
index 3ff1a57c..0e75524d 100644
--- a/imap.c
+++ b/imap.c
@@ -133,6 +133,7 @@ int	*sizes;
 	else
 	    sizes[num - 1] = -1;
     }
+    fseek(sockfp, 0L, SEEK_CUR);
 
     return(0);
 }
@@ -168,6 +169,7 @@ int *lenp;
 	    return(PS_SOCKET);
     } while
 	    (sscanf(buf+2, "%d FETCH (RFC822 {%d}", &num, lenp) != 2);
+    fseek(sockfp, 0L, SEEK_CUR);
 
     if (num != number)
 	return(PS_ERROR);
@@ -186,7 +188,10 @@ int number;
     if (fgets(buf, sizeof(buf), sockfp) == (char *)NULL)
 	return(PS_SOCKET);
     else
+    {
+	fseek(sockfp, 0L, SEEK_CUR);
 	return(0);
+    }
 }
 
 static int imap_delete(sockfp, ctl, number)
diff --git a/pop3.c b/pop3.c
index 4e5afe4b..cbe6ac0f 100644
--- a/pop3.c
+++ b/pop3.c
@@ -182,6 +182,7 @@ int *countp, *newp;
 			if (!uid_in_list(&ctl->oldsaved, id))
 			    (*newp)++;
 		    }
+		    fseek(sockfp, 0L, SEEK_CUR);
  		}
  	    }
  	}
@@ -217,6 +218,7 @@ int	*sizes;
 	    else
 		sizes[num - 1] = -1;
 	}
+	fseek(sockfp, 0L, SEEK_CUR);
 
 	return(0);
     }
-- 
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