akerr_reserve_status_range() and akerr_register_status_name() returned
private int enumerations, which was the one place in the library where a
failure was not an akerr_ErrorContext *. They now return one like
everything else: NULL on success, and on refusal an error whose status is
a real code in the library's reserved band, so it can be CATCH-ed,
HANDLE-d, PASS-ed, or left to propagate into a stack trace. Both are
marked AKERR_NOIGNORE, so discarding the result warns at compile time.
AKERR_STATUS_RANGE_OK and AKERR_STATUS_NAME_OK are gone; the remaining
seven codes move into the AKERR_* offset span and get registered names.
AKERR_LAST_LIBRARY_STATUS replaces AKERR_BADEXC as the top of that span
in the reserved-band static assert and the exhaustiveness sweep.
The refusal detail that used to go straight to akerr_log_method now
travels in the error message, so a caller that handles the error decides
whether it is reported. The two-argument akerr_name_for_status() set path
is the exception: it returns a name and cannot raise, so it logs and
releases. akerr_init() likewise has no caller to raise into, so failing
to reserve its own band or name its own codes is logged and fatal --
that can only happen on a misconfigured build, and continuing would
degrade every later stack trace to "Unknown Error".
Move the 1.0.0 upgrade notice out of README.md into UPGRADING.md and
rewrite its return-code tables in terms of the statuses now raised.
Tests: ctest 29/29, coverage 97.5% line / 64.5% branch, mutation 77.5%
(was 77.6%; the new survivors are the fatal init path, which needs a
library built with an undersized name table -- TODO item 7).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Reservations were advisory bookkeeping: any component could name any status,
so the registry only detected declared-range overlap between components that
both opted in. Naming a status now requires a reservation.
akerr_register_status_name() checks that the range belongs to the caller, and
the legacy two-argument akerr_name_for_status() set path, which cannot
identify its caller, requires that some reservation covers the status. Every
refusal is logged and names the real owner, because a name that fails to
register degrades that code to "Unknown Error" in every later stack trace.
Fix a reservation made before the first PREPARE_ERROR being silently
discarded. akerr_init() clears the tables, so whichever component first
triggered it wiped an earlier reservation and the next component to claim the
same range was told it was free, producing exactly the undetected aliasing
the registry exists to prevent. Every registry entry point now calls
akerr_init(), which sets its guard before doing any work so those calls do
not recurse.
Replace the linear-scan name array with an open-addressed hash table, taking
lookup from O(n) to O(1) and raising usable capacity from 512 entries (366
free to consumers after errno registration) to 3072 (~2900 free). Both table
sizes are build-time overridable and applied PRIVATE: they live entirely in
src/error.c, so raising them cannot desynchronize a library from its
consumers the way AKERR_MAX_ERR_VALUE could. Exhausting either table is now
logged and returned to the caller rather than silently dropping the entry.
No dynamic allocation is introduced; both tables remain file-scope arrays,
and the library's undefined-symbol set gains only strcmp and strlen.
Register names for AKERR_EOF, AKERR_ITERATOR_BREAK and AKERR_NOT_IMPLEMENTED,
which had none and rendered as "Unknown Error" in every stack trace carrying
them. err_error_names.c now sweeps the whole AKERR_* offset span so a code
added without a name fails there instead of in production traces.
Add static assertions that the slot count is a power of two and that
AKERR_BADEXC stays inside the library's own 0-255 band, the latter guarding
against a host errno space large enough to push library codes into the range
consumers are told to allocate from.
Set a project version and soname (1.0.0 / libakerror.so.1) so a stale
installed library can no longer be silently paired with newer headers, and so
akerror.pc ships a real Version field instead of an empty one.
Mutation testing surfaced an out-of-bounds probe in the new table that the
suite did not catch: masking with SLOTS rather than SLOTS-1 indexes past the
array, and err_maxval.c asserted only that some names registered before the
table filled, which a collapsed probe sequence still satisfies. It now
requires a substantial entry count and reads every entry back by its own
distinct name.
Tests: 28/28 pass. Coverage 99.4% line / 86.8% branch. Mutation score for
src/error.c 74% -> 77.3%.
Compatibility: source and ABI break. AKERR_MAX_ERR_VALUE and the
__AKERR_ERROR_NAMES data symbol are gone, custom codes must move out of
0-255, and names must be registered against a reserved range. README.md
carries the migration steps.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Replace the consumer-sized status-name array with private sparse storage and accept arbitrary integer status values. Add explicit range reservations with overlap diagnostics, reserve the library's 0-255 compatibility band, and harden pointer and string boundary handling.
Update regression coverage and document the required migration for custom status-code consumers.
Two hardening fixes flagged by the earlier review:
1. FAIL passed __FILE__ and __func__ directly as the snprintf format string.
__FILE__ expands to a string literal that could contain a '%' (a build path
under a directory with a percent sign), and __func__ is not a literal at all;
either way snprintf would read nonexistent varargs. Pass them as "%s"
arguments instead.
2. akerr_name_for_status guarded the upper bound but not the lower one, so a
negative status indexed __AKERR_ERROR_NAMES[negative] -- an out-of-bounds
read, or an out-of-bounds write when a name was supplied. Reject status < 0.
Regression tests err_format_string (uses #line to put a conversion specifier in
__FILE__) and err_name_bounds fail against the old code (verified) and pass now.
Full suite: 23/23, no warnings.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
