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feat(xce-test-rc-file): task 1.1 rc-file path resolution with XDG precedence

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Adds rcfile_resolve_path() (rcfile.c/rcfile.h): resolves $XDG_CONFIG_HOME/xce_test/rc
when set and non-empty, else $HOME/.config/xce_test/rc, else NULL. Standalone
libc-only module mirroring the configcompare.c pattern; wired into xce_test_src
and controller_unit_test_src, registered in controller_test.c's Unity runner.

6 unit tests in test_rcfile.c cover all XDG/HOME combinations plus a dedicated
env-var save/restore isolation test, addressing the cross-test leak risk found
during design review (controller_unit_test runs 80+ test files in one process).

Adds the xce-test-rc-file spec (requirements/design/tasks/research), including
design fixes from validation: getline()-based line reading (task 1.2, avoids
truncating long rc-file lines) and the env-isolation requirement above.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AgYRU3zDTqNGV5Jk8aiKLg
This commit is contained in:
Rongsong Shen 2026-08-26 13:48:27 +00:00
parent f9e8d97eac
commit 9de4db95d3
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10 changed files with 632 additions and 1 deletions
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src/controller/testsuite/rcfile.h Normal file
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#pragma once
/*
* rcfile.h -- xce_test startup rc-file path resolution (xce-test-rc-file
* spec, task 1.1).
*
* A standalone, dependency-light module following the same pattern as
* configcompare.c/h -- no dependency on test.c internals, linked into both
* the xce_test executable and controller_unit_test.
*
* This task implements path resolution only (rcfile_resolve_path()).
* Line-loading (rcfile_load()) is a later task in the same spec and will
* extend this file, not replace it.
*/
/* Resolves the rc-file path per the XDG Base Directory Specification:
* "$XDG_CONFIG_HOME/xce_test/rc" when XDG_CONFIG_HOME is set and non-empty,
* else "$HOME/.config/xce_test/rc" when HOME is set and non-empty. Returns
* a heap string the caller must free(), or NULL if neither variable yields
* a usable base directory. */
char* rcfile_resolve_path(void);