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Describe a readable prefix ending at n or the first NULL, with a length that fits the int index. This admits the documented (size_t)-1 sentinel mode without permitting signed overflow. State the first-match and missing-result properties directly instead of recursive array models. Turn strcmp_corollary into a proved ghost function and call it explicitly. Its conditional postcondition covers equal strings too, keeping both proof branches reachable. Update the obsolete lemma notes in the READMEs. WP proves 193/193 goals with RTE under the documented unsigned-wraparound policy; all 45 smoke tests pass. The executable algorithm is unchanged. PR: #14
evdenis
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Sep 18, 2026
Describe a readable prefix ending at n or the first NULL, with a length that fits the int index. This admits the documented (size_t)-1 sentinel mode without permitting signed overflow. State the first-match and missing-result properties directly instead of recursive array models. Turn strcmp_corollary into a proved ghost function and call it explicitly. Its conditional postcondition covers equal strings too, keeping both proof branches reachable. Update the obsolete lemma notes in the READMEs. WP proves 193/193 goals with RTE under the documented unsigned-wraparound policy; all 45 smoke tests pass. The executable algorithm is unchanged. PR: #14
evdenis
added a commit
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this pull request
Sep 18, 2026
Describe a readable prefix ending at n or the first NULL, with a length that fits the int index. This admits the documented (size_t)-1 sentinel mode without permitting signed overflow. State the first-match and missing-result properties directly instead of recursive array models. Turn strcmp_corollary into a proved ghost function and call it explicitly. Its conditional postcondition covers equal strings too, keeping both proof branches reachable. Update the obsolete lemma notes in the READMEs. WP proves 193/193 goals with RTE under the documented unsigned-wraparound policy; all 45 smoke tests pass. The executable algorithm is unchanged. PR: #14
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Superseded by #19. |
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