diff options
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/tclStringObj.c | 56 |
1 files changed, 46 insertions, 10 deletions
diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c index aae52ba..be71109 100644 --- a/generic/tclStringObj.c +++ b/generic/tclStringObj.c @@ -2847,7 +2847,7 @@ TclStringCatObjv( Tcl_Obj * const objv[], Tcl_Obj **objPtrPtr) { - Tcl_Obj *objPtr, *objResultPtr, * const *ov; + Tcl_Obj *objPtr, *objResultPtr, * const *ov, *pendingPtr = NULL; int oc, length = 0, binary = 1, first = 0, last = 0; int allowUniChar = 1, requestUniChar = 0; @@ -2952,14 +2952,37 @@ TclStringCatObjv( objPtr = *ov++; - Tcl_GetStringFromObj(objPtr, &numBytes); /* PANIC? */ - if (numBytes) { + if ((length == 0) && (objPtr->bytes == NULL) && !pendingPtr) { + /* No string rep; Take the chance we can avoid making it */ + last = objc - oc; - if (length == 0) { - first = last; - } - if ((length += numBytes) < 0) { - goto overflow; + first = last; + pendingPtr = objPtr; + } else { + + Tcl_GetStringFromObj(objPtr, &numBytes);/* PANIC? */ + if (numBytes) { + last = objc - oc; + if (length == 0) { + if (pendingPtr) { + int pendingNumBytes; + + Tcl_GetStringFromObj(pendingPtr, &pendingNumBytes); /* PANIC? */ + if (pendingNumBytes) { + if ((length += pendingNumBytes) < 0) { + goto overflow; + } + } else { + first = last; + } + pendingPtr = NULL; + } else { + first = last; + } + } + if ((length += numBytes) < 0) { + goto overflow; + } } } } while (--oc); @@ -3056,13 +3079,18 @@ TclStringCatObjv( } else { /* Efficiently concatenate string reps */ char *dst; + int start; if (inPlace && !Tcl_IsShared(*objv)) { - int start; - objResultPtr = *objv++; objc--; Tcl_GetStringFromObj(objResultPtr, &start); + if (pendingPtr) { + /* assert ( pendingPtr == objResultPtr ) */ + if ((length += start) < 0) { + goto overflow; + } + } if (0 == Tcl_AttemptSetObjLength(objResultPtr, length)) { if (interp) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( @@ -3075,8 +3103,16 @@ TclStringCatObjv( dst = Tcl_GetString(objResultPtr) + start; if (length > start) { TclFreeIntRep(objResultPtr); + } else { + /* Can't happen ? */ } } else { + if (pendingPtr) { + Tcl_GetStringFromObj(pendingPtr, &start); + if ((length += start) < 0) { + goto overflow; + } + } objResultPtr = Tcl_NewObj(); /* PANIC? */ if (0 == Tcl_AttemptSetObjLength(objResultPtr, length)) { if (interp) { |