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-rw-r--r--generic/tclLink.c120
1 files changed, 64 insertions, 56 deletions
diff --git a/generic/tclLink.c b/generic/tclLink.c
index 03a9249..fec4fdb 100644
--- a/generic/tclLink.c
+++ b/generic/tclLink.c
@@ -12,7 +12,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclLink.c,v 1.18 2007/01/29 17:16:11 dgp Exp $
+ * RCS: @(#) $Id: tclLink.c,v 1.19 2007/03/03 10:04:42 dkf Exp $
*/
#include "tclInt.h"
@@ -69,6 +69,17 @@ typedef struct Link {
static char * LinkTraceProc(ClientData clientData,Tcl_Interp *interp,
CONST char *name1, CONST char *name2, int flags);
static Tcl_Obj * ObjValue(Link *linkPtr);
+
+/*
+ * Convenience macro for accessing the value of the C variable pointed to by a
+ * link. Note that this macro produces something that may be regarded as an
+ * lvalue or rvalue; it may be assigned to as well as read. Also note that
+ * this macro assumes the name of the variable being accessed (linkPtr); this
+ * is not strictly a good thing, but it keeps the code much shorter and
+ * cleaner.
+ */
+
+#define LinkedVar(type) (*(type *) linkPtr->addr)
/*
*----------------------------------------------------------------------
@@ -283,45 +294,40 @@ LinkTraceProc(
switch (linkPtr->type) {
case TCL_LINK_INT:
case TCL_LINK_BOOLEAN:
- changed = *(int *)(linkPtr->addr) != linkPtr->lastValue.i;
+ changed = (LinkedVar(int) != linkPtr->lastValue.i);
break;
case TCL_LINK_DOUBLE:
- changed = *(double *)(linkPtr->addr) != linkPtr->lastValue.d;
+ changed = (LinkedVar(double) != linkPtr->lastValue.d);
break;
case TCL_LINK_WIDE_INT:
- changed = *(Tcl_WideInt *)(linkPtr->addr) != linkPtr->lastValue.w;
+ changed = (LinkedVar(Tcl_WideInt) != linkPtr->lastValue.w);
break;
case TCL_LINK_WIDE_UINT:
- changed = *(Tcl_WideUInt *)(linkPtr->addr) !=
- linkPtr->lastValue.uw;
+ changed = (LinkedVar(Tcl_WideUInt) != linkPtr->lastValue.uw);
break;
case TCL_LINK_CHAR:
- changed = *(char *)(linkPtr->addr) != linkPtr->lastValue.c;
+ changed = (LinkedVar(char) != linkPtr->lastValue.c);
break;
case TCL_LINK_UCHAR:
- changed = *(unsigned char *)(linkPtr->addr) !=
- linkPtr->lastValue.uc;
+ changed = (LinkedVar(unsigned char) != linkPtr->lastValue.uc);
break;
case TCL_LINK_SHORT:
- changed = *(short *)(linkPtr->addr) != linkPtr->lastValue.s;
+ changed = (LinkedVar(short) != linkPtr->lastValue.s);
break;
case TCL_LINK_USHORT:
- changed = *(unsigned short *)(linkPtr->addr) !=
- linkPtr->lastValue.us;
+ changed = (LinkedVar(unsigned short) != linkPtr->lastValue.us);
break;
case TCL_LINK_UINT:
- changed = *(unsigned int *)(linkPtr->addr) !=
- linkPtr->lastValue.ui;
+ changed = (LinkedVar(unsigned int) != linkPtr->lastValue.ui);
break;
case TCL_LINK_LONG:
- changed = *(long *)(linkPtr->addr) != linkPtr->lastValue.l;
+ changed = (LinkedVar(long) != linkPtr->lastValue.l);
break;
case TCL_LINK_ULONG:
- changed = *(unsigned long *)(linkPtr->addr) !=
- linkPtr->lastValue.ul;
+ changed = (LinkedVar(unsigned long) != linkPtr->lastValue.ul);
break;
case TCL_LINK_FLOAT:
- changed = *(float *)(linkPtr->addr) != linkPtr->lastValue.f;
+ changed = (LinkedVar(float) != linkPtr->lastValue.f);
break;
case TCL_LINK_STRING:
changed = 1;
@@ -355,6 +361,7 @@ LinkTraceProc(
/*
* This shouldn't ever happen.
*/
+
return "internal error: linked variable couldn't be read";
}
@@ -366,7 +373,7 @@ LinkTraceProc(
TCL_GLOBAL_ONLY);
return "variable must have integer value";
}
- *(int *)(linkPtr->addr) = linkPtr->lastValue.i;
+ LinkedVar(int) = linkPtr->lastValue.i;
break;
case TCL_LINK_WIDE_INT:
@@ -376,34 +383,34 @@ LinkTraceProc(
TCL_GLOBAL_ONLY);
return "variable must have integer value";
}
- *(Tcl_WideInt *)(linkPtr->addr) = linkPtr->lastValue.w;
+ LinkedVar(Tcl_WideInt) = linkPtr->lastValue.w;
break;
case TCL_LINK_DOUBLE:
if (Tcl_GetDoubleFromObj(NULL, valueObj, &linkPtr->lastValue.d)
!= TCL_OK) {
#ifdef ACCEPT_NAN
- if (valueObj->typePtr != &tclDoubleType) {
+ if (valueObj->typePtr != &tclDoubleType) {
#endif
- Tcl_ObjSetVar2(interp, linkPtr->varName, NULL, ObjValue(linkPtr),
- TCL_GLOBAL_ONLY);
- return "variable must have real value";
+ Tcl_ObjSetVar2(interp, linkPtr->varName, NULL,
+ ObjValue(linkPtr), TCL_GLOBAL_ONLY);
+ return "variable must have real value";
#ifdef ACCEPT_NAN
- }
- linkPtr->lastValue.d = valueObj->internalRep.doubleValue;
+ }
+ linkPtr->lastValue.d = valueObj->internalRep.doubleValue;
#endif
}
- *(double *)(linkPtr->addr) = linkPtr->lastValue.d;
+ LinkedVar(double) = linkPtr->lastValue.d;
break;
case TCL_LINK_BOOLEAN:
if (Tcl_GetBooleanFromObj(NULL, valueObj, &linkPtr->lastValue.i)
- != TCL_OK) {
+ != TCL_OK) {
Tcl_ObjSetVar2(interp, linkPtr->varName, NULL, ObjValue(linkPtr),
TCL_GLOBAL_ONLY);
return "variable must have boolean value";
}
- *(int *)(linkPtr->addr) = linkPtr->lastValue.i;
+ LinkedVar(int) = linkPtr->lastValue.i;
break;
case TCL_LINK_CHAR:
@@ -414,7 +421,7 @@ LinkTraceProc(
return "variable must have char value";
}
linkPtr->lastValue.c = (char)valueInt;
- *(char *)(linkPtr->addr) = linkPtr->lastValue.c;
+ LinkedVar(char) = linkPtr->lastValue.c;
break;
case TCL_LINK_UCHAR:
@@ -425,7 +432,7 @@ LinkTraceProc(
return "variable must have unsigned char value";
}
linkPtr->lastValue.uc = (unsigned char) valueInt;
- *(unsigned char *)(linkPtr->addr) = linkPtr->lastValue.uc;
+ LinkedVar(unsigned char) = linkPtr->lastValue.uc;
break;
case TCL_LINK_SHORT:
@@ -436,7 +443,7 @@ LinkTraceProc(
return "variable must have short value";
}
linkPtr->lastValue.s = (short)valueInt;
- *(short *)(linkPtr->addr) = linkPtr->lastValue.s;
+ LinkedVar(short) = linkPtr->lastValue.s;
break;
case TCL_LINK_USHORT:
@@ -447,7 +454,7 @@ LinkTraceProc(
return "variable must have unsigned short value";
}
linkPtr->lastValue.us = (unsigned short)valueInt;
- *(unsigned short *)(linkPtr->addr) = linkPtr->lastValue.us;
+ LinkedVar(unsigned short) = linkPtr->lastValue.us;
break;
case TCL_LINK_UINT:
@@ -458,7 +465,7 @@ LinkTraceProc(
return "variable must have unsigned int value";
}
linkPtr->lastValue.ui = (unsigned int)valueWide;
- *(unsigned int *)(linkPtr->addr) = linkPtr->lastValue.ui;
+ LinkedVar(unsigned int) = linkPtr->lastValue.ui;
break;
case TCL_LINK_LONG:
@@ -469,7 +476,7 @@ LinkTraceProc(
return "variable must have long value";
}
linkPtr->lastValue.l = (long)valueWide;
- *(long *)(linkPtr->addr) = linkPtr->lastValue.l;
+ LinkedVar(long) = linkPtr->lastValue.l;
break;
case TCL_LINK_ULONG:
@@ -480,7 +487,7 @@ LinkTraceProc(
return "variable must have unsigned long value";
}
linkPtr->lastValue.ul = (unsigned long)valueWide;
- *(unsigned long *)(linkPtr->addr) = linkPtr->lastValue.ul;
+ LinkedVar(unsigned long) = linkPtr->lastValue.ul;
break;
case TCL_LINK_WIDE_UINT:
@@ -493,7 +500,7 @@ LinkTraceProc(
return "variable must have unsigned wide int value";
}
linkPtr->lastValue.uw = (Tcl_WideUInt)valueWide;
- *(Tcl_WideUInt *)(linkPtr->addr) = linkPtr->lastValue.uw;
+ LinkedVar(Tcl_WideUInt) = linkPtr->lastValue.uw;
break;
case TCL_LINK_FLOAT:
@@ -504,13 +511,13 @@ LinkTraceProc(
return "variable must have float value";
}
linkPtr->lastValue.f = (float)valueDouble;
- *(float *)(linkPtr->addr) = linkPtr->lastValue.f;
+ LinkedVar(float) = linkPtr->lastValue.f;
break;
case TCL_LINK_STRING:
value = Tcl_GetStringFromObj(valueObj, &valueLength);
valueLength++;
- pp = (char **)(linkPtr->addr);
+ pp = (char **) linkPtr->addr;
if (*pp != NULL) {
ckfree(*pp);
}
@@ -550,49 +557,49 @@ ObjValue(
switch (linkPtr->type) {
case TCL_LINK_INT:
- linkPtr->lastValue.i = *(int *)(linkPtr->addr);
+ linkPtr->lastValue.i = LinkedVar(int);
return Tcl_NewIntObj(linkPtr->lastValue.i);
case TCL_LINK_WIDE_INT:
- linkPtr->lastValue.w = *(Tcl_WideInt *)(linkPtr->addr);
+ linkPtr->lastValue.w = LinkedVar(Tcl_WideInt);
return Tcl_NewWideIntObj(linkPtr->lastValue.w);
case TCL_LINK_DOUBLE:
- linkPtr->lastValue.d = *(double *)(linkPtr->addr);
+ linkPtr->lastValue.d = LinkedVar(double);
return Tcl_NewDoubleObj(linkPtr->lastValue.d);
case TCL_LINK_BOOLEAN:
- linkPtr->lastValue.i = *(int *)(linkPtr->addr);
+ linkPtr->lastValue.i = LinkedVar(int);
return Tcl_NewBooleanObj(linkPtr->lastValue.i != 0);
case TCL_LINK_CHAR:
- linkPtr->lastValue.c = *(char *)(linkPtr->addr);
+ linkPtr->lastValue.c = LinkedVar(char);
return Tcl_NewIntObj(linkPtr->lastValue.c);
case TCL_LINK_UCHAR:
- linkPtr->lastValue.uc = *(unsigned char *)(linkPtr->addr);
+ linkPtr->lastValue.uc = LinkedVar(unsigned char);
return Tcl_NewIntObj(linkPtr->lastValue.uc);
case TCL_LINK_SHORT:
- linkPtr->lastValue.s = *(short *)(linkPtr->addr);
+ linkPtr->lastValue.s = LinkedVar(short);
return Tcl_NewIntObj(linkPtr->lastValue.s);
case TCL_LINK_USHORT:
- linkPtr->lastValue.us = *(unsigned short *)(linkPtr->addr);
+ linkPtr->lastValue.us = LinkedVar(unsigned short);
return Tcl_NewIntObj(linkPtr->lastValue.us);
case TCL_LINK_UINT:
- linkPtr->lastValue.ui = *(unsigned int *)(linkPtr->addr);
- return Tcl_NewWideIntObj((Tcl_WideInt)(linkPtr->lastValue.ui));
+ linkPtr->lastValue.ui = LinkedVar(unsigned int);
+ return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.ui);
case TCL_LINK_LONG:
- linkPtr->lastValue.l = *(long *)(linkPtr->addr);
- return Tcl_NewWideIntObj(linkPtr->lastValue.l);
+ linkPtr->lastValue.l = LinkedVar(long);
+ return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.l);
case TCL_LINK_ULONG:
- linkPtr->lastValue.ul = *(unsigned long *)(linkPtr->addr);
- return Tcl_NewWideIntObj((Tcl_WideInt)(linkPtr->lastValue.ul));
+ linkPtr->lastValue.ul = LinkedVar(unsigned long);
+ return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.ul);
case TCL_LINK_FLOAT:
- linkPtr->lastValue.f = *(float *)(linkPtr->addr);
+ linkPtr->lastValue.f = LinkedVar(float);
return Tcl_NewDoubleObj(linkPtr->lastValue.f);
case TCL_LINK_WIDE_UINT:
- linkPtr->lastValue.uw = *(Tcl_WideUInt *)(linkPtr->addr);
+ linkPtr->lastValue.uw = LinkedVar(Tcl_WideUInt);
/*
* FIXME: represent as a bignum.
*/
return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.uw);
case TCL_LINK_STRING:
- p = *(char **)(linkPtr->addr);
+ p = LinkedVar(char *);
if (p == NULL) {
return Tcl_NewStringObj("NULL", 4);
}
@@ -602,6 +609,7 @@ ObjValue(
* This code only gets executed if the link type is unknown (shouldn't
* ever happen).
*/
+
default:
return Tcl_NewStringObj("??", 2);
}
generated by cgit v0.12 at 2024-11-09 06:32:16 (GMT)