Function cbm_resolve_cache_dir

src/foundation/platform.c:517–541

/* ── Cache directory ────────────────────────── */

const char *cbm_resolve_cache_dir(void) {
    static CBM_TLS char buf[CBM_SZ_4K];
    static const char missing[] = "\x1f"
                                  "CBM_CACHE_DIR_MISSING"
                                  "\x1f";
    const char *configured = cbm_safe_getenv("CBM_CACHE_DIR", buf, sizeof(buf), missing);
    if (!configured) {
        /* Present but not representable in the product path bound. */
        return NULL;
    }
    if (strcmp(configured, missing) != 0 && configured[0]) {
        cbm_normalize_path_sep(buf);
        return buf;
    }
    const char *home = cbm_get_home_dir();
    if (!home) {
        return NULL;
    }
    int written = snprintf(buf, sizeof(buf), "%s/.cache/codebase-memory-mcp", home);
    if (written <= 0 || (size_t)written >= sizeof(buf)) {
        buf[0] = '\0';
        return NULL;
    }
    return buf;
}