kconfig: migrate parser to implicit rules
[linux-2.6.git] / scripts / kconfig / confdata.c
index 1b8882d..2bafd9a 100644 (file)
@@ -5,6 +5,8 @@
 
 #include <sys/stat.h>
 #include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 static void conf_warning(const char *fmt, ...)
        __attribute__ ((format (printf, 1, 2)));
 
+static void conf_message(const char *fmt, ...)
+       __attribute__ ((format (printf, 1, 2)));
+
 static const char *conf_filename;
 static int conf_lineno, conf_warnings, conf_unsaved;
 
-const char conf_def_filename[] = ".config";
-
 const char conf_defname[] = "arch/$ARCH/defconfig";
 
-const char *conf_confnames[] = {
-       ".config",
-       "/lib/modules/$UNAME_RELEASE/.config",
-       "/etc/kernel-config",
-       "/boot/config-$UNAME_RELEASE",
-       conf_defname,
-       NULL,
-};
-
 static void conf_warning(const char *fmt, ...)
 {
        va_list ap;
@@ -44,6 +38,43 @@ static void conf_warning(const char *fmt, ...)
        conf_warnings++;
 }
 
+static void conf_default_message_callback(const char *fmt, va_list ap)
+{
+       printf("#\n# ");
+       vprintf(fmt, ap);
+       printf("\n#\n");
+}
+
+static void (*conf_message_callback) (const char *fmt, va_list ap) =
+       conf_default_message_callback;
+void conf_set_message_callback(void (*fn) (const char *fmt, va_list ap))
+{
+       conf_message_callback = fn;
+}
+
+static void conf_message(const char *fmt, ...)
+{
+       va_list ap;
+
+       va_start(ap, fmt);
+       if (conf_message_callback)
+               conf_message_callback(fmt, ap);
+}
+
+const char *conf_get_configname(void)
+{
+       char *name = getenv("KCONFIG_CONFIG");
+
+       return name ? name : ".config";
+}
+
+const char *conf_get_autoconfig_name(void)
+{
+       char *name = getenv("KCONFIG_AUTOCONFIG");
+
+       return name ? name : "include/config/auto.conf";
+}
+
 static char *conf_expand_value(const char *in)
 {
        struct symbol *sym;
@@ -86,179 +117,218 @@ char *conf_get_default_confname(void)
        return name;
 }
 
-int conf_read_simple(const char *name)
+static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
+{
+       char *p2;
+
+       switch (sym->type) {
+       case S_TRISTATE:
+               if (p[0] == 'm') {
+                       sym->def[def].tri = mod;
+                       sym->flags |= def_flags;
+                       break;
+               }
+       case S_BOOLEAN:
+               if (p[0] == 'y') {
+                       sym->def[def].tri = yes;
+                       sym->flags |= def_flags;
+                       break;
+               }
+               if (p[0] == 'n') {
+                       sym->def[def].tri = no;
+                       sym->flags |= def_flags;
+                       break;
+               }
+               conf_warning("symbol value '%s' invalid for %s", p, sym->name);
+               break;
+       case S_OTHER:
+               if (*p != '"') {
+                       for (p2 = p; *p2 && !isspace(*p2); p2++)
+                               ;
+                       sym->type = S_STRING;
+                       goto done;
+               }
+       case S_STRING:
+               if (*p++ != '"')
+                       break;
+               for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
+                       if (*p2 == '"') {
+                               *p2 = 0;
+                               break;
+                       }
+                       memmove(p2, p2 + 1, strlen(p2));
+               }
+               if (!p2) {
+                       conf_warning("invalid string found");
+                       return 1;
+               }
+       case S_INT:
+       case S_HEX:
+       done:
+               if (sym_string_valid(sym, p)) {
+                       sym->def[def].val = strdup(p);
+                       sym->flags |= def_flags;
+               } else {
+                       conf_warning("symbol value '%s' invalid for %s", p, sym->name);
+                       return 1;
+               }
+               break;
+       default:
+               ;
+       }
+       return 0;
+}
+
+int conf_read_simple(const char *name, int def)
 {
        FILE *in = NULL;
        char line[1024];
        char *p, *p2;
        struct symbol *sym;
-       int i;
+       int i, def_flags;
 
        if (name) {
                in = zconf_fopen(name);
        } else {
-               const char **names = conf_confnames;
-               while ((name = *names++)) {
-                       name = conf_expand_value(name);
+               struct property *prop;
+
+               name = conf_get_configname();
+               in = zconf_fopen(name);
+               if (in)
+                       goto load;
+               sym_add_change_count(1);
+               if (!sym_defconfig_list) {
+                       if (modules_sym)
+                               sym_calc_value(modules_sym);
+                       return 1;
+               }
+
+               for_all_defaults(sym_defconfig_list, prop) {
+                       if (expr_calc_value(prop->visible.expr) == no ||
+                           prop->expr->type != E_SYMBOL)
+                               continue;
+                       name = conf_expand_value(prop->expr->left.sym->name);
                        in = zconf_fopen(name);
                        if (in) {
-                               printf(_("#\n"
-                                        "# using defaults found in %s\n"
-                                        "#\n"), name);
-                               break;
+                               conf_message(_("using defaults found in %s"),
+                                        name);
+                               goto load;
                        }
                }
        }
        if (!in)
                return 1;
 
+load:
        conf_filename = name;
        conf_lineno = 0;
        conf_warnings = 0;
        conf_unsaved = 0;
 
+       def_flags = SYMBOL_DEF << def;
        for_all_symbols(i, sym) {
-               sym->flags |= SYMBOL_NEW | SYMBOL_CHANGED;
+               sym->flags |= SYMBOL_CHANGED;
+               sym->flags &= ~(def_flags|SYMBOL_VALID);
                if (sym_is_choice(sym))
-                       sym->flags &= ~SYMBOL_NEW;
-               sym->flags &= ~SYMBOL_VALID;
+                       sym->flags |= def_flags;
                switch (sym->type) {
                case S_INT:
                case S_HEX:
                case S_STRING:
-                       if (sym->user.val)
-                               free(sym->user.val);
+                       if (sym->def[def].val)
+                               free(sym->def[def].val);
                default:
-                       sym->user.val = NULL;
-                       sym->user.tri = no;
+                       sym->def[def].val = NULL;
+                       sym->def[def].tri = no;
                }
        }
 
        while (fgets(line, sizeof(line), in)) {
                conf_lineno++;
                sym = NULL;
-               switch (line[0]) {
-               case '#':
-                       if (memcmp(line + 2, "CONFIG_", 7))
+               if (line[0] == '#') {
+                       if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
                                continue;
-                       p = strchr(line + 9, ' ');
+                       p = strchr(line + 2 + strlen(CONFIG_), ' ');
                        if (!p)
                                continue;
                        *p++ = 0;
                        if (strncmp(p, "is not set", 10))
                                continue;
-                       sym = sym_find(line + 9);
-                       if (!sym) {
-                               conf_warning("trying to assign nonexistent symbol %s", line + 9);
-                               break;
-                       } else if (!(sym->flags & SYMBOL_NEW)) {
-                               conf_warning("trying to reassign symbol %s", sym->name);
-                               break;
+                       if (def == S_DEF_USER) {
+                               sym = sym_find(line + 2 + strlen(CONFIG_));
+                               if (!sym) {
+                                       sym_add_change_count(1);
+                                       goto setsym;
+                               }
+                       } else {
+                               sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
+                               if (sym->type == S_UNKNOWN)
+                                       sym->type = S_BOOLEAN;
+                       }
+                       if (sym->flags & def_flags) {
+                               conf_warning("override: reassigning to symbol %s", sym->name);
                        }
                        switch (sym->type) {
                        case S_BOOLEAN:
                        case S_TRISTATE:
-                               sym->user.tri = no;
-                               sym->flags &= ~SYMBOL_NEW;
+                               sym->def[def].tri = no;
+                               sym->flags |= def_flags;
                                break;
                        default:
                                ;
                        }
-                       break;
-               case 'C':
-                       if (memcmp(line, "CONFIG_", 7)) {
-                               conf_warning("unexpected data");
-                               continue;
-                       }
-                       p = strchr(line + 7, '=');
+               } else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
+                       p = strchr(line + strlen(CONFIG_), '=');
                        if (!p)
                                continue;
                        *p++ = 0;
                        p2 = strchr(p, '\n');
-                       if (p2)
-                               *p2 = 0;
-                       sym = sym_find(line + 7);
-                       if (!sym) {
-                               conf_warning("trying to assign nonexistent symbol %s", line + 7);
-                               break;
-                       } else if (!(sym->flags & SYMBOL_NEW)) {
-                               conf_warning("trying to reassign symbol %s", sym->name);
-                               break;
+                       if (p2) {
+                               *p2-- = 0;
+                               if (*p2 == '\r')
+                                       *p2 = 0;
                        }
-                       switch (sym->type) {
-                       case S_TRISTATE:
-                               if (p[0] == 'm') {
-                                       sym->user.tri = mod;
-                                       sym->flags &= ~SYMBOL_NEW;
-                                       break;
-                               }
-                       case S_BOOLEAN:
-                               if (p[0] == 'y') {
-                                       sym->user.tri = yes;
-                                       sym->flags &= ~SYMBOL_NEW;
-                                       break;
-                               }
-                               if (p[0] == 'n') {
-                                       sym->user.tri = no;
-                                       sym->flags &= ~SYMBOL_NEW;
-                                       break;
-                               }
-                               conf_warning("symbol value '%s' invalid for %s", p, sym->name);
-                               break;
-                       case S_STRING:
-                               if (*p++ != '"')
-                                       break;
-                               for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
-                                       if (*p2 == '"') {
-                                               *p2 = 0;
-                                               break;
-                                       }
-                                       memmove(p2, p2 + 1, strlen(p2));
-                               }
-                               if (!p2) {
-                                       conf_warning("invalid string found");
-                                       continue;
-                               }
-                       case S_INT:
-                       case S_HEX:
-                               if (sym_string_valid(sym, p)) {
-                                       sym->user.val = strdup(p);
-                                       sym->flags &= ~SYMBOL_NEW;
-                               } else {
-                                       conf_warning("symbol value '%s' invalid for %s", p, sym->name);
-                                       continue;
+                       if (def == S_DEF_USER) {
+                               sym = sym_find(line + strlen(CONFIG_));
+                               if (!sym) {
+                                       sym_add_change_count(1);
+                                       goto setsym;
                                }
-                               break;
-                       default:
-                               ;
+                       } else {
+                               sym = sym_lookup(line + strlen(CONFIG_), 0);
+                               if (sym->type == S_UNKNOWN)
+                                       sym->type = S_OTHER;
                        }
-                       break;
-               case '\n':
-                       break;
-               default:
-                       conf_warning("unexpected data");
+                       if (sym->flags & def_flags) {
+                               conf_warning("override: reassigning to symbol %s", sym->name);
+                       }
+                       if (conf_set_sym_val(sym, def, def_flags, p))
+                               continue;
+               } else {
+                       if (line[0] != '\r' && line[0] != '\n')
+                               conf_warning("unexpected data");
                        continue;
                }
+setsym:
                if (sym && sym_is_choice_value(sym)) {
                        struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
-                       switch (sym->user.tri) {
+                       switch (sym->def[def].tri) {
                        case no:
                                break;
                        case mod:
-                               if (cs->user.tri == yes) {
+                               if (cs->def[def].tri == yes) {
                                        conf_warning("%s creates inconsistent choice state", sym->name);
-                                       cs->flags |= SYMBOL_NEW;
+                                       cs->flags &= ~def_flags;
                                }
                                break;
                        case yes:
-                               if (cs->user.tri != no) {
-                                       conf_warning("%s creates inconsistent choice state", sym->name);
-                                       cs->flags |= SYMBOL_NEW;
-                               } else
-                                       cs->user.val = sym;
+                               if (cs->def[def].tri != no)
+                                       conf_warning("override: %s changes choice state", sym->name);
+                               cs->def[def].val = sym;
                                break;
                        }
-                       cs->user.tri = E_OR(cs->user.tri, sym->user.tri);
+                       cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
                }
        }
        fclose(in);
@@ -270,12 +340,14 @@ int conf_read_simple(const char *name)
 
 int conf_read(const char *name)
 {
-       struct symbol *sym;
+       struct symbol *sym, *choice_sym;
        struct property *prop;
        struct expr *e;
-       int i;
+       int i, flags;
+
+       sym_set_change_count(0);
 
-       if (conf_read_simple(name))
+       if (conf_read_simple(name, S_DEF_USER))
                return 1;
 
        for_all_symbols(i, sym) {
@@ -287,12 +359,12 @@ int conf_read(const char *name)
                        switch (sym->type) {
                        case S_BOOLEAN:
                        case S_TRISTATE:
-                               if (sym->user.tri != sym_get_tristate_value(sym))
+                               if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
                                        break;
                                if (!sym_is_choice(sym))
                                        goto sym_ok;
                        default:
-                               if (!strcmp(sym->curr.val, sym->user.val))
+                               if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
                                        goto sym_ok;
                                break;
                        }
@@ -302,45 +374,192 @@ int conf_read(const char *name)
                conf_unsaved++;
                /* maybe print value in verbose mode... */
        sym_ok:
+               if (!sym_is_choice(sym))
+                       continue;
+               /* The choice symbol only has a set value (and thus is not new)
+                * if all its visible childs have values.
+                */
+               prop = sym_get_choice_prop(sym);
+               flags = sym->flags;
+               expr_list_for_each_sym(prop->expr, e, choice_sym)
+                       if (choice_sym->visible != no)
+                               flags &= choice_sym->flags;
+               sym->flags &= flags | ~SYMBOL_DEF_USER;
+       }
+
+       for_all_symbols(i, sym) {
                if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
-                       if (sym->visible == no)
-                               sym->flags |= SYMBOL_NEW;
+                       /* Reset values of generates values, so they'll appear
+                        * as new, if they should become visible, but that
+                        * doesn't quite work if the Kconfig and the saved
+                        * configuration disagree.
+                        */
+                       if (sym->visible == no && !conf_unsaved)
+                               sym->flags &= ~SYMBOL_DEF_USER;
                        switch (sym->type) {
                        case S_STRING:
                        case S_INT:
                        case S_HEX:
-                               if (!sym_string_within_range(sym, sym->user.val)) {
-                                       sym->flags |= SYMBOL_NEW;
-                                       sym->flags &= ~SYMBOL_VALID;
-                               }
+                               /* Reset a string value if it's out of range */
+                               if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
+                                       break;
+                               sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
+                               conf_unsaved++;
+                               break;
                        default:
                                break;
                        }
                }
-               if (!sym_is_choice(sym))
-                       continue;
-               prop = sym_get_choice_prop(sym);
-               for (e = prop->expr; e; e = e->left.expr)
-                       if (e->right.sym->visible != no)
-                               sym->flags |= e->right.sym->flags & SYMBOL_NEW;
        }
 
-       sym_change_count = conf_warnings && conf_unsaved;
+       sym_add_change_count(conf_warnings || conf_unsaved);
+
+       return 0;
+}
+
+/* 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 %s%s \"", CONFIG_, name);
+       else
+               fprintf(out, "%s%s=\"", CONFIG_, 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, FILE *out, bool write_no)
+{
+       const char *str;
+
+       switch (sym->type) {
+       case S_BOOLEAN:
+       case S_TRISTATE:
+               switch (sym_get_tristate_value(sym)) {
+               case no:
+                       if (write_no)
+                               fprintf(out, "# %s%s is not set\n",
+                                   CONFIG_, sym->name);
+                       break;
+               case mod:
+                       fprintf(out, "%s%s=m\n", CONFIG_, sym->name);
+                       break;
+               case yes:
+                       fprintf(out, "%s%s=y\n", CONFIG_, 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, "%s%s=%s\n", CONFIG_, 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, 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;
 }
 
 int conf_write(const char *name)
 {
-       FILE *out, *out_h;
+       FILE *out;
        struct symbol *sym;
        struct menu *menu;
        const char *basename;
-       char dirname[128], tmpname[128], newname[128];
-       int type, l;
        const char *str;
-       time_t now;
-       int use_timestamp = 1;
+       char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
        char *env;
 
        dirname[0] = 0;
@@ -351,7 +570,7 @@ int conf_write(const char *name)
                if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
                        strcpy(dirname, name);
                        strcat(dirname, "/");
-                       basename = conf_def_filename;
+                       basename = conf_get_configname();
                } else if ((slash = strrchr(name, '/'))) {
                        int size = slash - name + 1;
                        memcpy(dirname, name, size);
@@ -359,50 +578,31 @@ int conf_write(const char *name)
                        if (slash[1])
                                basename = slash + 1;
                        else
-                               basename = conf_def_filename;
+                               basename = conf_get_configname();
                } else
                        basename = name;
        } else
-               basename = conf_def_filename;
+               basename = conf_get_configname();
 
-       sprintf(newname, "%s.tmpconfig.%d", dirname, (int)getpid());
-       out = fopen(newname, "w");
+       sprintf(newname, "%s%s", dirname, basename);
+       env = getenv("KCONFIG_OVERWRITECONFIG");
+       if (!env || !*env) {
+               sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
+               out = fopen(tmpname, "w");
+       } else {
+               *tmpname = 0;
+               out = fopen(newname, "w");
+       }
        if (!out)
                return 1;
-       out_h = NULL;
-       if (!name) {
-               out_h = fopen(".tmpconfig.h", "w");
-               if (!out_h)
-                       return 1;
-               file_write_dep(NULL);
-       }
-       sym = sym_lookup("KERNELVERSION", 0);
-       sym_calc_value(sym);
-       time(&now);
-       env = getenv("KCONFIG_NOTIMESTAMP");
-       if (env && *env)
-               use_timestamp = 0;
 
        fprintf(out, _("#\n"
                       "# Automatically generated make config: don't edit\n"
-                      "# Linux kernel version: %s\n"
-                      "%s%s"
+                      "# %s\n"
                       "#\n"),
-                    sym_get_string_value(sym),
-                    use_timestamp ? "# " : "",
-                    use_timestamp ? ctime(&now) : "");
-       if (out_h)
-               fprintf(out_h, "/*\n"
-                              " * Automatically generated C config: don't edit\n"
-                              " * Linux kernel version: %s\n"
-                              "%s%s"
-                              " */\n"
-                              "#define AUTOCONF_INCLUDED\n",
-                              sym_get_string_value(sym),
-                              use_timestamp ? " * " : "",
-                              use_timestamp ? ctime(&now) : "");
-
-       if (!sym_change_count)
+                    rootmenu.prompt->text);
+
+       if (!conf_get_changed())
                sym_clear_all_valid();
 
        menu = rootmenu.list;
@@ -416,86 +616,16 @@ int conf_write(const char *name)
                                     "#\n"
                                     "# %s\n"
                                     "#\n", str);
-                       if (out_h)
-                               fprintf(out_h, "\n"
-                                              "/*\n"
-                                              " * %s\n"
-                                              " */\n", str);
                } else if (!(sym->flags & SYMBOL_CHOICE)) {
                        sym_calc_value(sym);
                        if (!(sym->flags & SYMBOL_WRITE))
                                goto next;
                        sym->flags &= ~SYMBOL_WRITE;
-                       type = sym->type;
-                       if (type == S_TRISTATE) {
-                               sym_calc_value(modules_sym);
-                               if (modules_sym->curr.tri == no)
-                                       type = S_BOOLEAN;
-                       }
-                       switch (type) {
-                       case S_BOOLEAN:
-                       case S_TRISTATE:
-                               switch (sym_get_tristate_value(sym)) {
-                               case no:
-                                       fprintf(out, "# CONFIG_%s is not set\n", sym->name);
-                                       if (out_h)
-                                               fprintf(out_h, "#undef CONFIG_%s\n", sym->name);
-                                       break;
-                               case mod:
-                                       fprintf(out, "CONFIG_%s=m\n", sym->name);
-                                       if (out_h)
-                                               fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
-                                       break;
-                               case yes:
-                                       fprintf(out, "CONFIG_%s=y\n", sym->name);
-                                       if (out_h)
-                                               fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
-                                       break;
-                               }
-                               break;
-                       case S_STRING:
-                               // fix me
-                               str = sym_get_string_value(sym);
-                               fprintf(out, "CONFIG_%s=\"", sym->name);
-                               if (out_h)
-                                       fprintf(out_h, "#define CONFIG_%s \"", sym->name);
-                               do {
-                                       l = strcspn(str, "\"\\");
-                                       if (l) {
-                                               fwrite(str, l, 1, out);
-                                               if (out_h)
-                                                       fwrite(str, l, 1, out_h);
-                                       }
-                                       str += l;
-                                       while (*str == '\\' || *str == '"') {
-                                               fprintf(out, "\\%c", *str);
-                                               if (out_h)
-                                                       fprintf(out_h, "\\%c", *str);
-                                               str++;
-                                       }
-                               } while (*str);
-                               fputs("\"\n", out);
-                               if (out_h)
-                                       fputs("\"\n", out_h);
-                               break;
-                       case S_HEX:
-                               str = sym_get_string_value(sym);
-                               if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
-                                       fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
-                                       if (out_h)
-                                               fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
-                                       break;
-                               }
-                       case S_INT:
-                               str = sym_get_string_value(sym);
-                               fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
-                               if (out_h)
-                                       fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
-                               break;
-                       }
+                       /* Write config symbol to file */
+                       conf_write_symbol(sym, out, true);
                }
 
-       next:
+next:
                if (menu->list) {
                        menu = menu->list;
                        continue;
@@ -510,21 +640,400 @@ int conf_write(const char *name)
                }
        }
        fclose(out);
-       if (out_h) {
-               fclose(out_h);
-               rename(".tmpconfig.h", "include/linux/autoconf.h");
+
+       if (*tmpname) {
+               strcat(dirname, basename);
+               strcat(dirname, ".old");
+               rename(newname, dirname);
+               if (rename(tmpname, newname))
+                       return 1;
+       }
+
+       conf_message(_("configuration written to %s"), newname);
+
+       sym_set_change_count(0);
+
+       return 0;
+}
+
+static int conf_split_config(void)
+{
+       const char *name;
+       char path[PATH_MAX+1];
+       char *s, *d, c;
+       struct symbol *sym;
+       struct stat sb;
+       int res, i, fd;
+
+       name = conf_get_autoconfig_name();
+       conf_read_simple(name, S_DEF_AUTO);
+
+       if (chdir("include/config"))
+               return 1;
+
+       res = 0;
+       for_all_symbols(i, sym) {
+               sym_calc_value(sym);
+               if ((sym->flags & SYMBOL_AUTO) || !sym->name)
+                       continue;
+               if (sym->flags & SYMBOL_WRITE) {
+                       if (sym->flags & SYMBOL_DEF_AUTO) {
+                               /*
+                                * symbol has old and new value,
+                                * so compare them...
+                                */
+                               switch (sym->type) {
+                               case S_BOOLEAN:
+                               case S_TRISTATE:
+                                       if (sym_get_tristate_value(sym) ==
+                                           sym->def[S_DEF_AUTO].tri)
+                                               continue;
+                                       break;
+                               case S_STRING:
+                               case S_HEX:
+                               case S_INT:
+                                       if (!strcmp(sym_get_string_value(sym),
+                                                   sym->def[S_DEF_AUTO].val))
+                                               continue;
+                                       break;
+                               default:
+                                       break;
+                               }
+                       } else {
+                               /*
+                                * If there is no old value, only 'no' (unset)
+                                * is allowed as new value.
+                                */
+                               switch (sym->type) {
+                               case S_BOOLEAN:
+                               case S_TRISTATE:
+                                       if (sym_get_tristate_value(sym) == no)
+                                               continue;
+                                       break;
+                               default:
+                                       break;
+                               }
+                       }
+               } else if (!(sym->flags & SYMBOL_DEF_AUTO))
+                       /* There is neither an old nor a new value. */
+                       continue;
+               /* else
+                *      There is an old value, but no new value ('no' (unset)
+                *      isn't saved in auto.conf, so the old value is always
+                *      different from 'no').
+                */
+
+               /* Replace all '_' and append ".h" */
+               s = sym->name;
+               d = path;
+               while ((c = *s++)) {
+                       c = tolower(c);
+                       *d++ = (c == '_') ? '/' : c;
+               }
+               strcpy(d, ".h");
+
+               /* Assume directory path already exists. */
+               fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+               if (fd == -1) {
+                       if (errno != ENOENT) {
+                               res = 1;
+                               break;
+                       }
+                       /*
+                        * Create directory components,
+                        * unless they exist already.
+                        */
+                       d = path;
+                       while ((d = strchr(d, '/'))) {
+                               *d = 0;
+                               if (stat(path, &sb) && mkdir(path, 0755)) {
+                                       res = 1;
+                                       goto out;
+                               }
+                               *d++ = '/';
+                       }
+                       /* Try it again. */
+                       fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+                       if (fd == -1) {
+                               res = 1;
+                               break;
+                       }
+               }
+               close(fd);
        }
-       if (!name || basename != conf_def_filename) {
-               if (!name)
-                       name = conf_def_filename;
-               sprintf(tmpname, "%s.old", name);
-               rename(name, tmpname);
+out:
+       if (chdir("../.."))
+               return 1;
+
+       return res;
+}
+
+int conf_write_autoconf(void)
+{
+       struct symbol *sym;
+       const char *str;
+       const char *name;
+       FILE *out, *tristate, *out_h;
+       int i;
+
+       sym_clear_all_valid();
+
+       file_write_dep("include/config/auto.conf.cmd");
+
+       if (conf_split_config())
+               return 1;
+
+       out = fopen(".tmpconfig", "w");
+       if (!out)
+               return 1;
+
+       tristate = fopen(".tmpconfig_tristate", "w");
+       if (!tristate) {
+               fclose(out);
+               return 1;
        }
-       sprintf(tmpname, "%s%s", dirname, basename);
-       if (rename(newname, tmpname))
+
+       out_h = fopen(".tmpconfig.h", "w");
+       if (!out_h) {
+               fclose(out);
+               fclose(tristate);
                return 1;
+       }
+
+       fprintf(out, "#\n"
+                    "# Automatically generated make config: don't edit\n"
+                    "# %s\n"
+                    "#\n",
+                    rootmenu.prompt->text);
+       fprintf(tristate, "#\n"
+                         "# Automatically generated - do not edit\n"
+                         "\n");
+       fprintf(out_h, "/*\n"
+                      " * Automatically generated C config: don't edit\n"
+                      " * %s\n"
+                      " */\n",
+                      rootmenu.prompt->text);
+
+       for_all_symbols(i, sym) {
+               sym_calc_value(sym);
+               if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
+                       continue;
+
+               /* write symbol to config file */
+               conf_write_symbol(sym, out, false);
+
+               /* update autoconf and tristate files */
+               switch (sym->type) {
+               case S_BOOLEAN:
+               case S_TRISTATE:
+                       switch (sym_get_tristate_value(sym)) {
+                       case no:
+                               break;
+                       case mod:
+                               fprintf(tristate, "%s%s=M\n",
+                                   CONFIG_, sym->name);
+                               fprintf(out_h, "#define %s%s_MODULE 1\n",
+                                   CONFIG_, sym->name);
+                               break;
+                       case yes:
+                               if (sym->type == S_TRISTATE)
+                                       fprintf(tristate,"%s%s=Y\n",
+                                           CONFIG_, sym->name);
+                               fprintf(out_h, "#define %s%s 1\n",
+                                   CONFIG_, sym->name);
+                               break;
+                       }
+                       break;
+               case S_STRING:
+                       conf_write_string(true, sym->name, sym_get_string_value(sym), out_h);
+                       break;
+               case S_HEX:
+                       str = sym_get_string_value(sym);
+                       if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
+                               fprintf(out_h, "#define %s%s 0x%s\n",
+                                   CONFIG_, sym->name, str);
+                               break;
+                       }
+               case S_INT:
+                       str = sym_get_string_value(sym);
+                       fprintf(out_h, "#define %s%s %s\n",
+                           CONFIG_, sym->name, str);
+                       break;
+               default:
+                       break;
+               }
+       }
+       fclose(out);
+       fclose(tristate);
+       fclose(out_h);
 
-       sym_change_count = 0;
+       name = getenv("KCONFIG_AUTOHEADER");
+       if (!name)
+               name = "include/generated/autoconf.h";
+       if (rename(".tmpconfig.h", name))
+               return 1;
+       name = getenv("KCONFIG_TRISTATE");
+       if (!name)
+               name = "include/config/tristate.conf";
+       if (rename(".tmpconfig_tristate", name))
+               return 1;
+       name = conf_get_autoconfig_name();
+       /*
+        * This must be the last step, kbuild has a dependency on auto.conf
+        * and this marks the successful completion of the previous steps.
+        */
+       if (rename(".tmpconfig", name))
+               return 1;
 
        return 0;
 }
+
+static int sym_change_count;
+static void (*conf_changed_callback)(void);
+
+void sym_set_change_count(int count)
+{
+       int _sym_change_count = sym_change_count;
+       sym_change_count = count;
+       if (conf_changed_callback &&
+           (bool)_sym_change_count != (bool)count)
+               conf_changed_callback();
+}
+
+void sym_add_change_count(int count)
+{
+       sym_set_change_count(count + sym_change_count);
+}
+
+bool conf_get_changed(void)
+{
+       return sym_change_count;
+}
+
+void conf_set_changed_callback(void (*fn)(void))
+{
+       conf_changed_callback = fn;
+}
+
+static void randomize_choice_values(struct symbol *csym)
+{
+       struct property *prop;
+       struct symbol *sym;
+       struct expr *e;
+       int cnt, def;
+
+       /*
+        * If choice is mod then we may have more items selected
+        * and if no then no-one.
+        * In both cases stop.
+        */
+       if (csym->curr.tri != yes)
+               return;
+
+       prop = sym_get_choice_prop(csym);
+
+       /* count entries in choice block */
+       cnt = 0;
+       expr_list_for_each_sym(prop->expr, e, sym)
+               cnt++;
+
+       /*
+        * find a random value and set it to yes,
+        * set the rest to no so we have only one set
+        */
+       def = (rand() % cnt);
+
+       cnt = 0;
+       expr_list_for_each_sym(prop->expr, e, sym) {
+               if (def == cnt++) {
+                       sym->def[S_DEF_USER].tri = yes;
+                       csym->def[S_DEF_USER].val = sym;
+               }
+               else {
+                       sym->def[S_DEF_USER].tri = no;
+               }
+       }
+       csym->flags |= SYMBOL_DEF_USER;
+       /* clear VALID to get value calculated */
+       csym->flags &= ~(SYMBOL_VALID);
+}
+
+static void set_all_choice_values(struct symbol *csym)
+{
+       struct property *prop;
+       struct symbol *sym;
+       struct expr *e;
+
+       prop = sym_get_choice_prop(csym);
+
+       /*
+        * Set all non-assinged choice values to no
+        */
+       expr_list_for_each_sym(prop->expr, e, sym) {
+               if (!sym_has_value(sym))
+                       sym->def[S_DEF_USER].tri = no;
+       }
+       csym->flags |= SYMBOL_DEF_USER;
+       /* clear VALID to get value calculated */
+       csym->flags &= ~(SYMBOL_VALID);
+}
+
+void conf_set_all_new_symbols(enum conf_def_mode mode)
+{
+       struct symbol *sym, *csym;
+       int i, cnt;
+
+       for_all_symbols(i, sym) {
+               if (sym_has_value(sym))
+                       continue;
+               switch (sym_get_type(sym)) {
+               case S_BOOLEAN:
+               case S_TRISTATE:
+                       switch (mode) {
+                       case def_yes:
+                               sym->def[S_DEF_USER].tri = yes;
+                               break;
+                       case def_mod:
+                               sym->def[S_DEF_USER].tri = mod;
+                               break;
+                       case def_no:
+                               sym->def[S_DEF_USER].tri = no;
+                               break;
+                       case def_random:
+                               cnt = sym_get_type(sym) == S_TRISTATE ? 3 : 2;
+                               sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
+                               break;
+                       default:
+                               continue;
+                       }
+                       if (!(sym_is_choice(sym) && mode == def_random))
+                               sym->flags |= SYMBOL_DEF_USER;
+                       break;
+               default:
+                       break;
+               }
+
+       }
+
+       sym_clear_all_valid();
+
+       /*
+        * We have different type of choice blocks.
+        * If curr.tri equals to mod then we can select several
+        * choice symbols in one block.
+        * In this case we do nothing.
+        * If curr.tri equals yes then only one symbol can be
+        * selected in a choice block and we set it to yes,
+        * and the rest to no.
+        */
+       for_all_symbols(i, csym) {
+               if (sym_has_value(csym) || !sym_is_choice(csym))
+                       continue;
+
+               sym_calc_value(csym);
+               if (mode == def_random)
+                       randomize_choice_values(csym);
+               else
+                       set_all_choice_values(csym);
+       }
+}