Standalone portable header-based implementation of FORTIFY_SOURCE=3 http://git.dustri.org/fortify-headers/atom?h=master 2026-05-04T15:02:12Z 2026-05-04T15:02:12Z jvoisin 2026-05-04T15:02:12Z urn:sha1:f6b4a6e6feae6c6f4dfeecfd04363163ba4d7098 2026-04-30T15:42:29Z jvoisin 2026-04-30T15:42:29Z urn:sha1:f9239e2c0f0be9856322727887a45333683940a6 __d is a char * destination buffer, so __b is already the byte capacity. Dividing by sizeof(wchar_t) makes no sense here, it was likely copy-pasted from mbsnrtowcs (where the destination is wchar_t *). The first branch also fails to limit __n (the byte write cap) to __b, so overflows are possible when a wide character produces multi-byte output. The second branch (else) correctly limits __n to __b. This commit replaces the broken two-branch logic with the simple correct pattern matching wcsrtombs, and adds two tests two prove that nothing broke.