+/* Write a S_STRING */
+static void conf_write_string(bool headerfile, const char *name,
+ const char *str, FILE *out)
+{
+ int l;
+ if (headerfile)
+ fprintf(out, "#define CONFIG_%s \"", name);
+ else
+ fprintf(out, "CONFIG_%s=\"", name);
+
+ while (1) {
+ l = strcspn(str, "\"\\");
+ if (l) {
+ xfwrite(str, l, 1, out);
+ str += l;
+ }
+ if (!*str)
+ break;
+ fprintf(out, "\\%c", *str++);
+ }
+ fputs("\"\n", out);
+}
+
+static void conf_write_symbol(struct symbol *sym, enum symbol_type type,
+ FILE *out, bool write_no)
+{
+ const char *str;
+
+ switch (type) {
+ case S_BOOLEAN:
+ case S_TRISTATE:
+ switch (sym_get_tristate_value(sym)) {
+ case no:
+ if (write_no)
+ fprintf(out, "# CONFIG_%s is not set\n", sym->name);
+ break;
+ case mod:
+ fprintf(out, "CONFIG_%s=m\n", sym->name);
+ break;
+ case yes:
+ fprintf(out, "CONFIG_%s=y\n", sym->name);
+ break;
+ }
+ break;
+ case S_STRING:
+ conf_write_string(false, sym->name, sym_get_string_value(sym), out);
+ break;
+ case S_HEX:
+ case S_INT:
+ str = sym_get_string_value(sym);
+ fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+ break;
+ case S_OTHER:
+ case S_UNKNOWN:
+ break;
+ }
+}
+
+/*
+ * Write out a minimal config.
+ * All values that has default values are skipped as this is redundant.
+ */
+int conf_write_defconfig(const char *filename)
+{
+ struct symbol *sym;
+ struct menu *menu;
+ FILE *out;
+
+ out = fopen(filename, "w");
+ if (!out)
+ return 1;
+
+ sym_clear_all_valid();
+
+ /* Traverse all menus to find all relevant symbols */
+ menu = rootmenu.list;
+
+ while (menu != NULL)
+ {
+ sym = menu->sym;
+ if (sym == NULL) {
+ if (!menu_is_visible(menu))
+ goto next_menu;
+ } else if (!sym_is_choice(sym)) {
+ sym_calc_value(sym);
+ if (!(sym->flags & SYMBOL_WRITE))
+ goto next_menu;
+ sym->flags &= ~SYMBOL_WRITE;
+ /* If we cannot change the symbol - skip */
+ if (!sym_is_changable(sym))
+ goto next_menu;
+ /* If symbol equals to default value - skip */
+ if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
+ goto next_menu;
+
+ /*
+ * If symbol is a choice value and equals to the
+ * default for a choice - skip.
+ * But only if value is bool and equal to "y" and
+ * choice is not "optional".
+ * (If choice is "optional" then all values can be "n")
+ */
+ if (sym_is_choice_value(sym)) {
+ struct symbol *cs;
+ struct symbol *ds;
+
+ cs = prop_get_symbol(sym_get_choice_prop(sym));
+ ds = sym_choice_default(cs);
+ if (!sym_is_optional(cs) && sym == ds) {
+ if ((sym->type == S_BOOLEAN) &&
+ sym_get_tristate_value(sym) == yes)
+ goto next_menu;
+ }
+ }
+ conf_write_symbol(sym, sym->type, out, true);
+ }
+next_menu:
+ if (menu->list != NULL) {
+ menu = menu->list;
+ }
+ else if (menu->next != NULL) {
+ menu = menu->next;
+ } else {
+ while ((menu = menu->parent)) {
+ if (menu->next != NULL) {
+ menu = menu->next;
+ break;
+ }
+ }
+ }
+ }
+ fclose(out);
+ return 0;
+}
+