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authorferrieux <ferrieux@users.sourceforge.net>2014-08-05 09:55:54 (GMT)
committerferrieux <ferrieux@users.sourceforge.net>2014-08-05 09:55:54 (GMT)
commit93a502d2ff6f6a849b8307bd531f5b55dea69e24 (patch)
treedb4410c55281d59cd857f6cd3651f1bba66237fa /generic
parent5374b5841bef9a7163465a6b27b5634899eff611 (diff)
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More optimized non-BC [string cat] using Tcl_AppendObjToObj() - thx Donal
Diffstat (limited to 'generic')
-rw-r--r--generic/tclCmdMZ.c45
1 files changed, 14 insertions, 31 deletions
diff --git a/generic/tclCmdMZ.c b/generic/tclCmdMZ.c
index ea5d7a4..841002f 100644
--- a/generic/tclCmdMZ.c
+++ b/generic/tclCmdMZ.c
@@ -2859,17 +2859,9 @@ StringCatCmd(
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
- int tot, i, length;
- char *bytes, *p;
+ int i;
Tcl_Obj *objResultPtr;
- /*
- * NOTE: this implementation aims for simplicity, not speed, because all
- * speed-critical uses of [string cat] will involve the compiled variant
- * anyway. Thus we avoid code duplication (from TEBC/INST_CONCAT1) without
- * sacrificing perf.
- */
-
if (objc < 2) {
/*
* If there are no args, the result is an empty object.
@@ -2877,30 +2869,21 @@ StringCatCmd(
*/
return TCL_OK;
}
- tot = 0;
- for(i = 1;i < objc;i++) {
- bytes = TclGetStringFromObj(objv[i], &length);
- if (bytes != NULL) {
- tot += length;
- }
+ if (objc == 2) {
+ /*
+ * Other trivial case, single arg, just return it.
+ */
+ Tcl_SetObjResult(interp, objv[1]);
+ return TCL_OK;
}
- if (tot < 0) {
- /* TODO: convert panic to error ? */
- Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX);
- }
- p = ckalloc(tot + 1);
- TclNewObj(objResultPtr);
- objResultPtr->bytes = p;
- objResultPtr->length = tot;
- for (i = 1;i < objc;i++) {
- bytes = TclGetStringFromObj(objv[i], &length);
- if (bytes != NULL) {
- memcpy(p, bytes, (size_t) length);
- p += length;
- }
+ objResultPtr = objv[1];
+ if (Tcl_IsShared(objResultPtr)) {
+ objResultPtr = Tcl_DuplicateObj(objResultPtr);
+ }
+ for(i = 2;i < objc;i++) {
+ Tcl_AppendObjToObj(objResultPtr, objv[i]);
}
- *p = '\0';
- Tcl_SetObjResult(interp,objResultPtr);
+ Tcl_SetObjResult(interp, objResultPtr);
return TCL_OK;
}