std: sysstr cleanup, add docs
#25180
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- Removed redundant `len` and `reserved` sets already
performed by prior `rawNewStringNoInit` calls.
- Reuse `appendChar`
- Removed never used `newOwnedString`
- Added internal `toOwnedCopy`
- Documents differences in impls of internal procs used for
`system.string.setLen`:
+ `strs_v2.setLengthStrV2`:
- does not set the terminating zero byte when new length is 0
- does not handle negative new length
+ `sysstr.setLengthStr`:
- sets the terminating zero byte when new length is 0
- bounds negative new length to 0
ZoomRmc
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Sep 21, 2025
Continuation of nim-lang#25180. This one refactors the sequence routines. Preparation for extending with new routines. Mostly removes repeating code to simplify debugging. Removes: - `incrSeq` and `incrSeqV2` superseded by `incrSeqV3`, - `setLengthSeq` superseded by `setLengthSeqV2` Note comment on line 338, acknowledging that implementation of `setLenUninit` from nim-lang#25022 does zero the new memory in this branch, having been copied from `setLengthSeqV2`. This PR does not fix this.
ZoomRmc
added a commit
to ZoomRmc/Nim
that referenced
this pull request
Sep 21, 2025
Continuation of nim-lang#25180. This one refactors the sequence routines. Preparation for extending with new routines. Mostly removes repeating code to simplify debugging. Removes: - `incrSeqV2` superseded by `incrSeqV3`, - `setLengthSeq` superseded by `setLengthSeqV2` Note comment on line 338, acknowledging that implementation of `setLenUninit` from nim-lang#25022 does zero the new memory in this branch, having been copied from `setLengthSeqV2`. This PR does not fix this.
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lenandreservedsets already performed by priorrawNewStringNoInitcalls.appendCharnewOwnedStringtoOwnedCopysystem.string.setLen:strs_v2.setLengthStrV2:sysstr.setLengthStr: