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* doc/StringObj.3: Added entry for Tcl_AttemptSetObjLength.
* generic/tclDecls.h:
* generic/tclStubInit.c: Regen'ed stubs files from new tcl.decls.
* generic/tcl.decls: Added stubs for the Tcl_Attempt* memory
allocators and for Tcl_AttemptSetObjLength.
* generic/tcl.h: Added #define's for attemptckalloc,
attemptckrealloc, which map to the Tcl_Attempt* memory allocators.
* generic/tclCkalloc.c: Added non-panic'ing versions of Tcl_Alloc,
Tcl_Realloc, etc.; these are called Tcl_AttemptAlloc,
Tcl_AttemptRealloc, etc. These are used by
Tcl_AttemptSetObjLength and the string obj append functions.
* generic/tclStringObj.c: Modified string growth algorithm to use
doubling algorithm as long as possible, and only fall back when
that fails. Added Tcl_AttemptSetObjLength, and modified
AppendUnicodeToUnicodeRep, AppendUtfToUtfRep, and
Tcl_AppendStringsToObjVA to support this.
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the puplic API: Tcl_NewUnicodeObj, Tcl_SetUnicodeObj,
Tcl_GetUnicode, Tcl_GetUniChar, Tcl_GetCharLength, Tcl_GetRange,
Tcl_AppendUnicodeToObj.
Note: some stringObj tests are still failing--the teststringobj command
still needs to be updated.
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