Function cbm_unsetenv

src/foundation/compat.h:167–188

    return status;
}
static inline int cbm_unsetenv(const char *name) {
    if (!name) {
        return EINVAL;
    }
    int name_chars = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, name, -1, NULL, 0);
    wchar_t *wide_name =
        name_chars > 0 ? (wchar_t *)malloc((size_t)name_chars * sizeof(*wide_name)) : NULL;
    if (!wide_name ||
        MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, name, -1, wide_name, name_chars) <= 0) {
        free(wide_name);
        return EINVAL;
    }
    int status = _putenv_s(name, "");
    if (status == 0) {
        SetLastError(ERROR_SUCCESS);
        if (!SetEnvironmentVariableW(wide_name, NULL) && GetLastError() != ERROR_ENVVAR_NOT_FOUND) {
            status = EINVAL;
        }
    }
    free(wide_name);
    return status;
}
#else
#define cbm_setenv setenv
#define cbm_unsetenv unsetenv