diff options
Diffstat (limited to 'generic/tclCmdIL.c')
| -rw-r--r-- | generic/tclCmdIL.c | 49 |
1 files changed, 38 insertions, 11 deletions
diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c index 41f4d27..4ed2337 100644 --- a/generic/tclCmdIL.c +++ b/generic/tclCmdIL.c @@ -105,8 +105,7 @@ typedef struct { */ static int DictionaryCompare(const char *left, const char *right); -static int IfConditionCallback(ClientData data[], - Tcl_Interp *interp, int result); +static Tcl_NRPostProc IfConditionCallback; static int InfoArgsCmd(ClientData dummy, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); static int InfoBodyCmd(ClientData dummy, Tcl_Interp *interp, @@ -2156,8 +2155,8 @@ Tcl_JoinObjCmd( int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* The argument objects. */ { - int listLen, i; - Tcl_Obj *resObjPtr, *joinObjPtr, **elemPtrs; + int listLen; + Tcl_Obj *resObjPtr = NULL, *joinObjPtr, **elemPtrs; if ((objc < 2) || (objc > 3)) { Tcl_WrongNumArgs(interp, 1, objv, "list ?joinString?"); @@ -2174,19 +2173,47 @@ Tcl_JoinObjCmd( return TCL_ERROR; } + if (listLen == 0) { + /* No elements to join; default empty result is correct. */ + return TCL_OK; + } + if (listLen == 1) { + /* One element; return it */ + Tcl_SetObjResult(interp, elemPtrs[0]); + return TCL_OK; + } + joinObjPtr = (objc == 2) ? Tcl_NewStringObj(" ", 1) : objv[2]; Tcl_IncrRefCount(joinObjPtr); - resObjPtr = Tcl_NewObj(); - for (i = 0; i < listLen; i++) { - if (i > 0) { - Tcl_AppendObjToObj(resObjPtr, joinObjPtr); + if (Tcl_GetCharLength(joinObjPtr) == 0) { + TclStringCatObjv(interp, /* inPlace */ 0, listLen, elemPtrs, + &resObjPtr); + } else { + int i; + + resObjPtr = Tcl_NewObj(); + for (i = 0; i < listLen; i++) { + if (i > 0) { + + /* + * NOTE: This code is relying on Tcl_AppendObjToObj() **NOT** + * to shimmer joinObjPtr. If it did, then the case where + * objv[1] and objv[2] are the same value would not be safe. + * Accessing elemPtrs would crash. + */ + + Tcl_AppendObjToObj(resObjPtr, joinObjPtr); + } + Tcl_AppendObjToObj(resObjPtr, elemPtrs[i]); } - Tcl_AppendObjToObj(resObjPtr, elemPtrs[i]); } Tcl_DecrRefCount(joinObjPtr); - Tcl_SetObjResult(interp, resObjPtr); - return TCL_OK; + if (resObjPtr) { + Tcl_SetObjResult(interp, resObjPtr); + return TCL_OK; + } + return TCL_ERROR; } /* |