* generic/tclIO.c (Tcl_SetChannelBufferSize): Lowest size limit

* tests/io.test: 	changed from ten bytes to one byte.  Need
* tests/iogt.test:	for this change was proven by
Ross Cartlidge <rossc@cisco.com> where [read stdin 1] was grabbing
10 bytes followed by starting a child process that was intended to
continue reading from stdin.  Even with -buffersize set to one,
nine chars were getting lost by the buffersize over reading for
the native read() caused by [read].

1 files changed, 9 insertions, 8 deletions

diff --git a/generic/tclIO.c b/generic/tclIO.c
index 90451c1..46ebf28 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -10,7 +10,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclIO.c,v 1.61.2.9 2005/01/27 22:53:32 andreas_kupries Exp $
+ * RCS: @(#) $Id: tclIO.c,v 1.61.2.10 2005/04/14 07:10:06 davygrvy Exp $
  */
 
 #include "tclInt.h"
@@ -5998,7 +5998,7 @@ Tcl_ChannelBuffered(chan)
  * Tcl_SetChannelBufferSize --
  *
  *	Sets the size of buffers to allocate to store input or output
- *	in the channel. The size must be between 10 bytes and 1 MByte.
+ *	in the channel. The size must be between 1 byte and 1 MByte.
  *
  * Results:
  *	None.
@@ -6018,11 +6018,11 @@ Tcl_SetChannelBufferSize(chan, sz)
     ChannelState *statePtr;		/* State of real channel structure. */
     
     /*
-     * If the buffer size is smaller than 10 bytes or larger than one MByte,
+     * If the buffer size is smaller than 1 byte or larger than one MByte,
      * do not accept the requested size and leave the current buffer size.
      */
     
-    if (sz < 10) {
+    if (sz < 1) {
         return;
     }
     if (sz > (1024 * 1024)) {
@@ -6473,10 +6473,11 @@ Tcl_SetChannelOption(interp, chan, optionName, newValue)
 	return TCL_OK;
     } else if ((len > 7) && (optionName[1] == 'b') &&
             (strncmp(optionName, "-buffersize", len) == 0)) {
-        statePtr->bufSize = atoi(newValue);	/* INTL: "C", UTF safe. */
-        if ((statePtr->bufSize < 10) || (statePtr->bufSize > (1024 * 1024))) {
-            statePtr->bufSize = CHANNELBUFFER_DEFAULT_SIZE;
-        }
+	int newBufferSize;
+	if (Tcl_GetInt(interp, newValue, &newBufferSize) == TCL_ERROR) {
+	    return TCL_ERROR;
+	}
+	Tcl_SetChannelBufferSize(chan, newBufferSize);
     } else if ((len > 2) && (optionName[1] == 'e') &&
 	    (strncmp(optionName, "-encoding", len) == 0)) {
 	Tcl_Encoding encoding;