Function cbm_fqn_folder

internal/cbm/helpers.c:1505–1536

}

char *cbm_fqn_folder(CBMArena *a, const char *project, const char *rel_dir) {
    // project.dir1.dir2
    size_t proj_len = strlen(project);
    size_t dir_len = strlen(rel_dir);
    size_t max_len = proj_len + SKIP_ONE + dir_len + SKIP_ONE;
    char *buf = (char *)cbm_arena_alloc(a, max_len);
    if (!buf) {
        return NULL;
    }

    char *out = buf;
    memcpy(out, project, proj_len);
    out += proj_len;

    if (dir_len > 0 && !(dir_len == SKIP_ONE && rel_dir[0] == '.')) {
        const char *start = rel_dir;
        const char *end_ptr = rel_dir + dir_len;
        while (start < end_ptr) {
            const char *slash = (const char *)memchr(start, '/', end_ptr - start);
            const char *part_end = slash ? slash : end_ptr;
            size_t part_len = (size_t)(part_end - start);
            if (part_len > 0) {
                *out++ = '.';
                memcpy(out, start, part_len);
                out += part_len;
            }
            start = part_end + SKIP_ONE;
        }
    }
    *out = '\0';
    return buf;
}

/* ── String literal classifier ──────────────────────────────────── */