Final part of result generation conversion (modulo any minor blunders)

8 files changed, 148 insertions, 158 deletions

diff --git a/win/tclWinChan.c b/win/tclWinChan.c
index 517aa20..bc233ea 100644
--- a/win/tclWinChan.c
+++ b/win/tclWinChan.c
@@ -940,8 +940,9 @@ TclpOpenFileChannel(
 	}
 	TclWinConvertError(err);
 	if (interp != (Tcl_Interp *) NULL) {
-	    Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
-		    "\": ", Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "couldn't open \"%s\": %s",
+		    TclGetString(pathPtr),, Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
@@ -959,9 +960,9 @@ TclpOpenFileChannel(
 	if (handle == INVALID_HANDLE_VALUE) {
 	    TclWinConvertError(GetLastError());
 	    if (interp != (Tcl_Interp *) NULL) {
-		Tcl_AppendResult(interp, "couldn't reopen serial \"",
-			TclGetString(pathPtr), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't reopen serial \"%s\": %s",
+			TclGetString(pathPtr), Tcl_PosixError(interp)));
 	    }
 	    return NULL;
 	}
@@ -995,8 +996,9 @@ TclpOpenFileChannel(
 	 */
 
 	channel = NULL;
-	Tcl_AppendResult(interp, "couldn't open \"", TclGetString(pathPtr),
-		"\": bad file type", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't open \"%s\": bad file type",
+		TclGetString(pathPtr)));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "BAD_TYPE",
 		NULL);
 	break;
diff --git a/win/tclWinDde.c b/win/tclWinDde.c
index 4d6e31b..e225989 100644
--- a/win/tclWinDde.c
+++ b/win/tclWinDde.c
@@ -157,7 +157,8 @@ Dde_Init(
 
 #ifdef UNICODE
     if (TclWinGetPlatformId() < VER_PLATFORM_WIN32_NT) {
-	Tcl_AppendResult(interp, "Win32s and Windows 9x are not supported platforms", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"Win32s and Windows 9x are not supported platforms", -1));
 	return TCL_ERROR;
     }
 #endif
@@ -947,8 +948,8 @@ MakeDdeConnection(
 
     if (ddeConv == (HCONV) NULL) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "no registered server named \"",
-		    name, "\"", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "no registered server named \"%s\"", name));
 	    Tcl_SetErrorCode(interp, "TCL", "DDE", "NO_SERVER", NULL);
 	}
 	return TCL_ERROR;
diff --git a/win/tclWinFCmd.c b/win/tclWinFCmd.c
index 77a5b82..80fad3e 100644
--- a/win/tclWinFCmd.c
+++ b/win/tclWinFCmd.c
@@ -1530,8 +1530,8 @@ StatError(
 				 * error. */
 {
     TclWinConvertError(GetLastError());
-    Tcl_AppendResult(interp, "could not read \"", TclGetString(fileName),
-	    "\": ", Tcl_PosixError(interp), (char *) NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf("could not read \"%s\": %s",
+	    TclGetString(fileName), Tcl_PosixError(interp)));
 }
 
 /*
@@ -1649,9 +1649,9 @@ ConvertFileNameFormat(
 
     if (splitPath == NULL || pathc == 0) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "could not read \"",
-		    Tcl_GetString(fileName), "\": no such file or directory",
-		    (char *) NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "could not read \"%s\": no such file or directory",
+		    Tcl_GetString(fileName)));
 	    errno = ENOENT;
 	    Tcl_PosixError(interp);
 	}
@@ -1941,9 +1941,9 @@ CannotSetAttribute(
     Tcl_Obj *fileName,		/* The name of the file. */
     Tcl_Obj *attributePtr)	/* The new value of the attribute. */
 {
-    Tcl_AppendResult(interp, "cannot set attribute \"",
-	    tclpFileAttrStrings[objIndex], "\" for file \"",
-	    Tcl_GetString(fileName), "\": attribute is readonly", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "cannot set attribute \"%s\" for file \"%s\": attribute is readonly",
+	    tclpFileAttrStrings[objIndex], Tcl_GetString(fileName)));
     errno = EINVAL;
     Tcl_PosixError(interp);
     return TCL_ERROR;
diff --git a/win/tclWinFile.c b/win/tclWinFile.c
index 1f56060..a44a257 100644
--- a/win/tclWinFile.c
+++ b/win/tclWinFile.c
@@ -1048,10 +1048,9 @@ TclpMatchInDirectory(
 
 	    TclWinConvertError(err);
 	    if (interp != NULL) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't read directory \"",
-			Tcl_DStringValue(&dsOrig), "\": ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't read directory \"%s\": %s",
+			Tcl_DStringValue(&dsOrig), Tcl_PosixError(interp)));
 	    }
 	    Tcl_DStringFree(&dsOrig);
 	    return TCL_ERROR;
@@ -1866,8 +1865,9 @@ TclpGetCwd(
     if (GetCurrentDirectory(MAX_PATH, buffer) == 0) {
 	TclWinConvertError(GetLastError());
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "error getting working directory name: ",
-		    Tcl_PosixError(interp), NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "error getting working directory name: %s",
+		    Tcl_PosixError(interp)));
 	}
 	return NULL;
     }
diff --git a/win/tclWinPipe.c b/win/tclWinPipe.c
index db462f8..36ae58a 100644
--- a/win/tclWinPipe.c
+++ b/win/tclWinPipe.c
@@ -1030,8 +1030,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdInput == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate input handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate input handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1065,8 +1066,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdOutput == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate output handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate output handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1084,8 +1086,9 @@ TclpCreateProcess(
     }
     if (startInfo.hStdError == INVALID_HANDLE_VALUE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't duplicate error handle: ",
-		Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't duplicate error handle: %s",
+		Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1129,9 +1132,9 @@ TclpCreateProcess(
 	}
 
 	if (applType == APPL_DOS) {
-	    Tcl_AppendResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "DOS application process not supported on this platform",
-		    (char *) NULL);
+		    -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "EXEC", "DOS_APP",
 		    NULL);
 	    goto end;
@@ -1158,12 +1161,12 @@ TclpCreateProcess(
 
     BuildCommandLine(execPath, argc, argv, &cmdLine);
 
-    if (CreateProcess(NULL,
-	    (TCHAR *) Tcl_DStringValue(&cmdLine), NULL, NULL, TRUE,
-	    (DWORD) createFlags, NULL, NULL, &startInfo, &procInfo) == 0) {
+    if (CreateProcess(NULL, (TCHAR *) Tcl_DStringValue(&cmdLine),
+	    NULL, NULL, TRUE, (DWORD) createFlags, NULL, NULL, &startInfo,
+	    &procInfo) == 0) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't execute \"", argv[0],
-		"\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
+		argv[0], Tcl_PosixError(interp)));
 	goto end;
     }
 
@@ -1409,8 +1412,8 @@ ApplicationType(
 
     if (applType == APPL_NONE) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "couldn't execute \"", originalName,
-		"\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("couldn't execute \"%s\": %s",
+		originalName, Tcl_PosixError(interp)));
 	return APPL_NONE;
     }
 
@@ -1673,8 +1676,8 @@ Tcl_CreatePipe(
 
     if (!CreatePipe(&readHandle, &writeHandle, &sec, 0)) {
 	TclWinConvertError(GetLastError());
-	Tcl_AppendResult(interp, "pipe creation failed: ",
-		Tcl_PosixError(interp), NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"pipe creation failed: %s", Tcl_PosixError(interp)));
 	return TCL_ERROR;
     }
 
diff --git a/win/tclWinReg.c b/win/tclWinReg.c
index 9c08b0c..c4a89e6 100644
--- a/win/tclWinReg.c
+++ b/win/tclWinReg.c
@@ -172,7 +172,7 @@ Registry_Init(
 {
     Tcl_Command cmd;
 
-    if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
+    if (Tcl_InitStubs(interp, "8.5", 0) == NULL) {
 	return TCL_ERROR;
     }
 
@@ -534,9 +534,9 @@ DeleteValue(
     result = RegDeleteValue(key, (const TCHAR *)Tcl_DStringValue(&ds));
     Tcl_DStringFree(&ds);
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to delete value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to delete value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	result = TCL_ERROR;
     } else {
@@ -574,7 +574,8 @@ GetKeyNames(
 {
     const char *pattern;	/* Pattern being matched against subkeys */
     HKEY key;			/* Handle to the key being examined */
-    TCHAR buffer[MAX_KEY_LENGTH];		/* Buffer to hold the subkey name */
+    TCHAR buffer[MAX_KEY_LENGTH];
+				/* Buffer to hold the subkey name */
     DWORD bufSize;		/* Size of the buffer */
     DWORD index;		/* Position of the current subkey */
     char *name;			/* Subkey name */
@@ -610,9 +611,9 @@ GetKeyNames(
 	    if (result == ERROR_NO_MORE_ITEMS) {
 		result = TCL_OK;
 	    } else {
-		Tcl_SetObjResult(interp, Tcl_NewObj());
-		Tcl_AppendResult(interp, "unable to enumerate subkeys of \"",
-			Tcl_GetString(keyNameObj), "\": ", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"unable to enumerate subkeys of \"%s\": ",
+			Tcl_GetString(keyNameObj)));
 		AppendSystemError(interp, result);
 		result = TCL_ERROR;
 	    }
@@ -693,9 +694,9 @@ GetType(
     RegCloseKey(key);
 
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to get type of value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to get type of value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	return TCL_ERROR;
     }
@@ -787,9 +788,9 @@ GetValue(
     Tcl_DStringFree(&buf);
     RegCloseKey(key);
     if (result != ERROR_SUCCESS) {
-	Tcl_AppendResult(interp, "unable to get value \"",
-		Tcl_GetString(valueNameObj), "\" from key \"",
-		Tcl_GetString(keyNameObj), "\": ", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unable to get value \"%s\" from key \"%s\": ",
+		Tcl_GetString(valueNameObj), Tcl_GetString(keyNameObj)));
 	AppendSystemError(interp, result);
 	Tcl_DStringFree(&data);
 	return TCL_ERROR;
@@ -1110,8 +1111,8 @@ ParseKeyName(
 	rootName = name;
     }
     if (!rootName) {
-	Tcl_AppendResult(interp, "bad key \"", name,
-		"\": must start with a valid root", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad key \"%s\": must start with a valid root", name));
 	Tcl_SetErrorCode(interp, "WIN_REG", "NO_ROOT_KEY", NULL);
 	return TCL_ERROR;
     }
diff --git a/win/tclWinSerial.c b/win/tclWinSerial.c
index 58a9eb4..fb7f69b 100644
--- a/win/tclWinSerial.c
+++ b/win/tclWinSerial.c
@@ -1673,12 +1673,7 @@ SerialSetOptionProc(
 
     if ((len > 2) && (strncmp(optionName, "-mode", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 	native = Tcl_WinUtfToTChar(value, -1, &ds);
 	result = BuildCommDCB(native, &dcb);
@@ -1686,8 +1681,9 @@ SerialSetOptionProc(
 
 	if (result == FALSE) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -mode: should be baud,parity,data,stop", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -mode: should be baud,parity,data,stop",
+			value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SERIALMODE", NULL);
 	    }
 	    return TCL_ERROR;
@@ -1703,12 +1699,7 @@ SerialSetOptionProc(
 	dcb.fAbortOnError = FALSE;
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1719,12 +1710,7 @@ SerialSetOptionProc(
 
     if ((len > 1) && (strncmp(optionName, "-handshake", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 
 	/*
@@ -1759,21 +1745,16 @@ SerialSetOptionProc(
 	    dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
 	} else {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -handshake: must be one of xonxoff, rtscts, "
-			"dtrdsr or none", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -handshake: must be one of"
+			" xonxoff, rtscts, dtrdsr or none", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "HANDSHAKE", NULL);
 	    }
 	    return TCL_ERROR;
 	}
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1784,12 +1765,7 @@ SerialSetOptionProc(
 
     if ((len > 1) && (strncmp(optionName, "-xchar", len) == 0)) {
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 
 	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
@@ -1798,9 +1774,9 @@ SerialSetOptionProc(
 	if (argc != 2) {
 	badXchar:
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value for -xchar: should be "
-			"a list of two elements with each a single character",
-			NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"bad value for -xchar: should be a list of"
+			" two elements with each a single character", -1));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "XCHAR", NULL);
 	    }
 	    ckfree(argv);
@@ -1837,12 +1813,7 @@ SerialSetOptionProc(
 	ckfree(argv);
 
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -1859,9 +1830,9 @@ SerialSetOptionProc(
 	}
 	if ((argc % 2) == 1) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -ttycontrol: should be a list of "
-			"signal,value pairs", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -ttycontrol: should be "
+			"a list of signal,value pairs", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTYCONTROL", NULL);
 	    }
 	    ckfree(argv);
@@ -1877,7 +1848,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETDTR : CLRDTR))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp, "can't set DTR signal", NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set DTR signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1888,7 +1860,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETRTS : CLRRTS))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp, "can't set RTS signal", NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set RTS signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1899,7 +1872,8 @@ SerialSetOptionProc(
 		if (!EscapeCommFunction(infoPtr->handle,
 			(DWORD) (flag ? SETBREAK : CLRBREAK))) {
 		    if (interp != NULL) {
-			Tcl_AppendResult(interp,"can't set BREAK signal",NULL);
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
+				"can't set BREAK signal", -1));
 			Tcl_SetErrorCode(interp, "TCL", "OPERATION",
 				"FCONFIGURE", "TTY_SIGNAL", NULL);
 		    }
@@ -1908,9 +1882,9 @@ SerialSetOptionProc(
 		}
 	    } else {
 		if (interp != NULL) {
-		    Tcl_AppendResult(interp, "bad signal name \"", argv[i],
-			    "\" for -ttycontrol: must be DTR, RTS or BREAK",
-			    NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "bad signal name \"%s\" for -ttycontrol: must be"
+			    " DTR, RTS or BREAK", argv[i]));
 		    Tcl_SetErrorCode(interp, "TCL", "VALUE", "TTY_SIGNAL",
 			    NULL);
 		}
@@ -1949,9 +1923,9 @@ SerialSetOptionProc(
 
 	if ((argc < 1) || (argc > 2) || (inSize <= 0) || (outSize <= 0)) {
 	    if (interp != NULL) {
-		Tcl_AppendResult(interp, "bad value \"", value,
-			"\" for -sysbuffer: should be a list of one or two "
-			"integers > 0", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"bad value \"%s\" for -sysbuffer: should be "
+			"a list of one or two integers > 0", value));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "SYS_BUFFER", NULL);
 	    }
 	    return TCL_ERROR;
@@ -1960,8 +1934,9 @@ SerialSetOptionProc(
 	if (!SetupComm(infoPtr->handle, inSize, outSize)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't setup comm buffers: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't setup comm buffers: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -1974,22 +1949,12 @@ SerialSetOptionProc(
 	 */
 
 	if (!GetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto getStateFailed;
 	}
 	dcb.XonLim = (WORD) (infoPtr->sysBufRead*1/2);
 	dcb.XoffLim = (WORD) (infoPtr->sysBufRead*1/4);
 	if (!SetCommState(infoPtr->handle, &dcb)) {
-	    if (interp != NULL) {
-		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm state: ",
-			Tcl_PosixError(interp), NULL);
-	    }
-	    return TCL_ERROR;
+	    goto setStateFailed;
 	}
 	return TCL_OK;
     }
@@ -2020,8 +1985,9 @@ SerialSetOptionProc(
 	if (!SetCommTimeouts(infoPtr->handle, &tout)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't set comm timeouts: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't set comm timeouts: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2031,6 +1997,22 @@ SerialSetOptionProc(
 
     return Tcl_BadChannelOption(interp, optionName,
 	    "mode handshake pollinterval sysbuffer timeout ttycontrol xchar");
+
+  getStateFailed:
+    if (interp != NULL) {
+	TclWinConvertError(GetLastError());
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't get comm state: ", Tcl_PosixError(interp)));
+    }
+    return TCL_ERROR;
+
+  setStateFailed:
+    if (interp != NULL) {
+	TclWinConvertError(GetLastError());
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't set comm state: ", Tcl_PosixError(interp)));
+    }
+    return TCL_ERROR;
 }
 
 /*
@@ -2089,8 +2071,8 @@ SerialGetOptionProc(
 	if (!GetCommState(infoPtr->handle, &dcb)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get comm state: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2159,8 +2141,8 @@ SerialGetOptionProc(
 	if (!GetCommState(infoPtr->handle, &dcb)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get comm state: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get comm state: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2237,8 +2219,8 @@ SerialGetOptionProc(
 	if (!GetCommModemStatus(infoPtr->handle, &status)) {
 	    if (interp != NULL) {
 		TclWinConvertError(GetLastError());
-		Tcl_AppendResult(interp, "can't get tty status: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get tty status: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2248,10 +2230,9 @@ SerialGetOptionProc(
 
     if (valid) {
 	return TCL_OK;
-    } else {
-	return Tcl_BadChannelOption(interp, optionName,
-		"mode pollinterval lasterror queue sysbuffer ttystatus xchar");
     }
+    return Tcl_BadChannelOption(interp, optionName,
+	    "mode pollinterval lasterror queue sysbuffer ttystatus xchar");
 }
 
 /*
diff --git a/win/tclWinSock.c b/win/tclWinSock.c
index 97b10a3..6986528 100644
--- a/win/tclWinSock.c
+++ b/win/tclWinSock.c
@@ -558,8 +558,8 @@ TclpHasSockets(
 	return TCL_OK;
     }
     if (interp != NULL) {
-	Tcl_AppendResult(interp, "sockets are not available on this system",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"sockets are not available on this system", -1));
     }
     return TCL_ERROR;
 }
@@ -928,8 +928,8 @@ TcpClose2Proc(
 	break;
     default:
 	if (interp) {
-	    Tcl_AppendResult(interp,
-		    "Socket close2proc called bidirectionally", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "Socket close2proc called bidirectionally", -1));
 	}
 	return TCL_ERROR;
     }
@@ -1280,12 +1280,9 @@ CreateSocket(
     }
 
     if (interp != NULL) {
-        Tcl_AppendResult(interp, "couldn't open socket: ", NULL);
-        if (errorMsg == NULL) {
-            Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
-        } else {
-            Tcl_AppendResult(interp, errorMsg, NULL);
-        }
+        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"couldn't open socket: %s",
+		(errorMsg ? errorMsg : Tcl_PosixError(interp)));
     }
 
     if (sock != INVALID_SOCKET) {
@@ -1929,7 +1926,8 @@ TcpSetOptionProc(
 
     if (!SocketsEnabled()) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "winsock is not initialized", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "winsock is not initialized", -1));
 	}
 	return TCL_ERROR;
     }
@@ -1952,8 +1950,9 @@ TcpSetOptionProc(
 	if (rtn != 0) {
 	    TclWinConvertError(WSAGetLastError());
 	    if (interp) {
-		Tcl_AppendResult(interp, "couldn't set socket option: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set socket option: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -1973,8 +1972,9 @@ TcpSetOptionProc(
 	if (rtn != 0) {
 	    TclWinConvertError(WSAGetLastError());
 	    if (interp) {
-		Tcl_AppendResult(interp, "couldn't set socket option: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set socket option: %s",
+			Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}
@@ -2032,7 +2032,8 @@ TcpGetOptionProc(
 
     if (!SocketsEnabled()) {
 	if (interp) {
-	    Tcl_AppendResult(interp, "winsock is not initialized", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "winsock is not initialized", -1));
 	}
 	return TCL_ERROR;
     }
@@ -2099,8 +2100,9 @@ TcpGetOptionProc(
 	    if (len) {
 		TclWinConvertError((DWORD) WSAGetLastError());
 		if (interp) {
-		    Tcl_AppendResult(interp, "can't get peername: ",
-			    Tcl_PosixError(interp), NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "can't get peername: %s",
+			    Tcl_PosixError(interp)));
 		}
 		return TCL_ERROR;
 	    }
@@ -2164,8 +2166,8 @@ TcpGetOptionProc(
 	} else {
 	    if (interp) {
 		TclWinConvertError((DWORD) WSAGetLastError());
-		Tcl_AppendResult(interp, "can't get sockname: ",
-			Tcl_PosixError(interp), NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"can't get sockname: %s", Tcl_PosixError(interp)));
 	    }
 	    return TCL_ERROR;
 	}