vim ./scripts/kconfig/confdata.c

/*
 * Header printer
 *
 * This printer is used when generating the `include/generated/autoconf.h' file.
 */
static void
header_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
{

        switch (sym->type) {
        case S_BOOLEAN:
        case S_TRISTATE: {
                const char *suffix = "";

                switch (*value) {
                case 'n':
                        break;
                case 'm':
                        suffix = "_MODULE";
                        /* fall through */
                default:
                        fprintf(fp, "#define %s%s%s 1\n",
                            CONFIG_, sym->name, suffix);
                }
                break;
        }
        case S_HEX: {
                const char *prefix = "";

                if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
                        prefix = "0x";
                fprintf(fp, "#define %s%s %s%s\n",
                    CONFIG_, sym->name, prefix, value);
                break;
        }
        case S_STRING:
        case S_INT:
                fprintf(fp, "#define %s%s %s\n",
                    CONFIG_, sym->name, value);
                break;
        default:
                break;
        }

}