Yet another major rework of the BusyBox config system, using the considerably

modified Kbuild system I put into uClibc.  With this, there should be no more
need to modify Rules.mak since I've moved all the interesting options into the
config system.  I think I've got everything updated, but you never know, I may
have made some mistakes, so watch closely.
 -Erik

1 files changed, 629 insertions, 0 deletions

diff --git a/scripts/config/symbol.c b/scripts/config/symbol.c
new file mode 100644
index 000000000..f2d0015de
--- /dev/null
+++ b/scripts/config/symbol.c
@@ -0,0 +1,629 @@
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ * Released under the terms of the GNU GPL v2.0.
+ */
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/utsname.h>
+
+#define LKC_DIRECT_LINK
+#include "lkc.h"
+
+struct symbol symbol_yes = {
+        name: "y",
+        curr: { "y", yes },
+        flags: SYMBOL_YES|SYMBOL_VALID,
+}, symbol_mod = {
+        name: "m",
+        curr: { "m", mod },
+        flags: SYMBOL_MOD|SYMBOL_VALID,
+}, symbol_no = {
+        name: "n",
+        curr: { "n", no },
+        flags: SYMBOL_NO|SYMBOL_VALID,
+}, symbol_empty = {
+        name: "",
+        curr: { "", no },
+        flags: SYMBOL_VALID,
+};
+
+int sym_change_count;
+struct symbol *modules_sym;
+
+void sym_add_default(struct symbol *sym, const char *def)
+{
+        struct property *prop = create_prop(P_DEFAULT);
+        struct property **propp;
+
+        prop->sym = sym;
+        prop->def = sym_lookup(def, 1);
+
+        /* append property to the prop list of symbol */
+        if (prop->sym) {
+                for (propp = &prop->sym->prop; *propp; propp = &(*propp)->next)
+                        ;
+                *propp = prop;
+        }
+}
+
+void sym_init(void)
+{
+        struct symbol *sym;
+        struct utsname uts;
+        char *p;
+        static bool inited = false;
+
+        if (inited)
+                return;
+        inited = true;
+
+        uname(&uts);
+
+#if 0
+        sym = sym_lookup("ARCH", 0);
+        sym->type = S_STRING;
+        sym->flags |= SYMBOL_AUTO;
+        p = getenv("ARCH");
+        if (p)
+                sym_add_default(sym, p);
+#endif
+
+        sym = sym_lookup("VERSION", 0);
+        sym->type = S_STRING;
+        sym->flags |= SYMBOL_AUTO;
+        p = getenv("VERSION");
+        if (p)
+                sym_add_default(sym, p);
+
+#if 0
+        sym = sym_lookup("UNAME_RELEASE", 0);
+        sym->type = S_STRING;
+        sym->flags |= SYMBOL_AUTO;
+        sym_add_default(sym, uts.release);
+#endif
+
+        sym = sym_lookup("TARGET_ARCH", 0);
+        sym->type = S_STRING;
+        sym->flags |= SYMBOL_AUTO;
+        p = getenv("TARGET_ARCH");
+        if (p)
+                sym_add_default(sym, p);
+}
+
+int sym_get_type(struct symbol *sym)
+{
+        int type = sym->type;
+        if (type == S_TRISTATE) {
+                if (sym_is_choice_value(sym) && sym->visible == yes)
+                        type = S_BOOLEAN;
+                else {
+                        sym_calc_value(modules_sym);
+                        if (S_TRI(modules_sym->curr) == no)
+                                type = S_BOOLEAN;
+                }
+        }
+        return type;
+}
+
+const char *sym_type_name(int type)
+{
+        switch (type) {
+        case S_BOOLEAN:
+                return "boolean";
+        case S_TRISTATE:
+                return "tristate";
+        case S_INT:
+                return "integer";
+        case S_HEX:
+                return "hex";
+        case S_STRING:
+                return "string";
+        case S_UNKNOWN:
+                return "unknown";
+        }
+        return "???";
+}
+
+struct property *sym_get_choice_prop(struct symbol *sym)
+{
+        struct property *prop;
+
+        for_all_choices(sym, prop)
+                return prop;
+        return NULL;
+}
+
+struct property *sym_get_default_prop(struct symbol *sym)
+{
+        struct property *prop;
+        tristate visible;
+
+        for_all_defaults(sym, prop) {
+                visible = E_CALC(prop->visible);
+                if (visible != no)
+                        return prop;
+        }
+        return NULL;
+}
+
+void sym_calc_visibility(struct symbol *sym)
+{
+        struct property *prop;
+        tristate visible, oldvisible;
+
+        /* any prompt visible? */
+        oldvisible = sym->visible;
+        visible = no;
+        for_all_prompts(sym, prop)
+                visible = E_OR(visible, E_CALC(prop->visible));
+        if (oldvisible != visible) {
+                sym->visible = visible;
+                sym->flags |= SYMBOL_CHANGED;
+        }
+}
+
+void sym_calc_value(struct symbol *sym)
+{
+        struct symbol_value newval, oldval;
+        struct property *prop, *def_prop;
+        struct symbol *def_sym;
+        struct expr *e;
+
+        if (sym->flags & SYMBOL_VALID)
+                return;
+
+        oldval = sym->curr;
+
+        switch (sym->type) {
+        case S_INT:
+        case S_HEX:
+        case S_STRING:
+                newval = symbol_empty.curr;
+                break;
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                newval = symbol_no.curr;
+                break;
+        default:
+                S_VAL(newval) = sym->name;
+                S_TRI(newval) = no;
+                if (sym->flags & SYMBOL_CONST) {
+                        goto out;
+                }
+                //newval = symbol_empty.curr;
+                // generate warning somewhere here later
+                //S_TRI(newval) = yes;
+                goto out;
+        }
+        sym->flags |= SYMBOL_VALID;
+        if (!sym_is_choice_value(sym))
+                sym->flags &= ~SYMBOL_WRITE;
+
+        sym_calc_visibility(sym);
+
+        /* set default if recursively called */
+        sym->curr = newval;
+
+        if (sym->visible != no) {
+                sym->flags |= SYMBOL_WRITE;
+                if (!sym_has_value(sym)) {
+                        if (!sym_is_choice(sym)) {
+                                prop = sym_get_default_prop(sym);
+                                if (prop) {
+                                        sym_calc_value(prop->def);
+                                        newval = prop->def->curr;
+                                }
+                        }
+                } else
+                        newval = sym->def;
+
+                S_TRI(newval) = E_AND(S_TRI(newval), sym->visible);
+                /* if the symbol is visible and not optionial,
+                 * possibly ignore old user choice. */
+                if (!sym_is_optional(sym) && S_TRI(newval) == no)
+                        S_TRI(newval) = sym->visible;
+                if (sym_is_choice_value(sym) && sym->visible == yes) {
+                        prop = sym_get_choice_prop(sym);
+                        S_TRI(newval) = (S_VAL(prop->def->curr) == sym) ? yes : no;
+                }
+        } else {
+                prop = sym_get_default_prop(sym);
+                if (prop) {
+                        sym->flags |= SYMBOL_WRITE;
+                        sym_calc_value(prop->def);
+                        newval = prop->def->curr;
+                }
+        }
+
+        switch (sym_get_type(sym)) {
+        case S_TRISTATE:
+                if (S_TRI(newval) != mod)
+                        break;
+                sym_calc_value(modules_sym);
+                if (S_TRI(modules_sym->curr) == no)
+                        S_TRI(newval) = yes;
+                break;
+        case S_BOOLEAN:
+                if (S_TRI(newval) == mod)
+                        S_TRI(newval) = yes;
+        }
+
+out:
+        sym->curr = newval;
+
+        if (sym_is_choice(sym) && S_TRI(newval) == yes) {
+                def_sym = S_VAL(sym->def);
+                if (def_sym) {
+                        sym_calc_visibility(def_sym);
+                        if (def_sym->visible == no)
+                                def_sym = NULL;
+                }
+                if (!def_sym) {
+                        for_all_defaults(sym, def_prop) {
+                                if (E_CALC(def_prop->visible) == no)
+                                        continue;
+                                sym_calc_visibility(def_prop->def);
+                                if (def_prop->def->visible != no) {
+                                        def_sym = def_prop->def;
+                                        break;
+                                }
+                        }
+                }
+
+                if (!def_sym) {
+                        prop = sym_get_choice_prop(sym);
+                        for (e = prop->dep; e; e = e->left.expr) {
+                                sym_calc_visibility(e->right.sym);
+                                if (e->right.sym->visible != no) {
+                                        def_sym = e->right.sym;
+                                        break;
+                                }
+                        }
+                }
+
+                S_VAL(newval) = def_sym;
+        }
+
+        if (memcmp(&oldval, &newval, sizeof(newval)))
+                sym->flags |= SYMBOL_CHANGED;
+        sym->curr = newval;
+
+        if (sym_is_choice(sym)) {
+                int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
+                prop = sym_get_choice_prop(sym);
+                for (e = prop->dep; e; e = e->left.expr)
+                        e->right.sym->flags |= flags;
+        }
+}
+
+void sym_clear_all_valid(void)
+{
+        struct symbol *sym;
+        int i;
+
+        for_all_symbols(i, sym)
+                sym->flags &= ~SYMBOL_VALID;
+        sym_change_count++;
+}
+
+void sym_set_all_changed(void)
+{
+        struct symbol *sym;
+        int i;
+
+        for_all_symbols(i, sym)
+                sym->flags |= SYMBOL_CHANGED;
+}
+
+bool sym_tristate_within_range(struct symbol *sym, tristate val)
+{
+        int type = sym_get_type(sym);
+
+        if (sym->visible == no)
+                return false;
+
+        if (type != S_BOOLEAN && type != S_TRISTATE)
+                return false;
+
+        switch (val) {
+        case no:
+                if (sym_is_choice_value(sym) && sym->visible == yes)
+                        return false;
+                return sym_is_optional(sym);
+        case mod:
+                if (sym_is_choice_value(sym) && sym->visible == yes)
+                        return false;
+                return type == S_TRISTATE;
+        case yes:
+                return type == S_BOOLEAN || sym->visible == yes;
+        }
+        return false;
+}
+
+bool sym_set_tristate_value(struct symbol *sym, tristate val)
+{
+        tristate oldval = sym_get_tristate_value(sym);
+
+        if (oldval != val && !sym_tristate_within_range(sym, val))
+                return false;
+
+        if (sym->flags & SYMBOL_NEW) {
+                sym->flags &= ~SYMBOL_NEW;
+                sym->flags |= SYMBOL_CHANGED;
+        }
+        if (sym_is_choice_value(sym) && val == yes) {
+                struct property *prop = sym_get_choice_prop(sym);
+
+                S_VAL(prop->def->def) = sym;
+                prop->def->flags &= ~SYMBOL_NEW;
+        }
+
+        S_TRI(sym->def) = val;
+        if (oldval != val) {
+                sym_clear_all_valid();
+                if (sym == modules_sym)
+                        sym_set_all_changed();
+        }
+
+        return true;
+}
+
+tristate sym_toggle_tristate_value(struct symbol *sym)
+{
+        tristate oldval, newval;
+
+        oldval = newval = sym_get_tristate_value(sym);
+        do {
+                switch (newval) {
+                case no:
+                        newval = mod;
+                        break;
+                case mod:
+                        newval = yes;
+                        break;
+                case yes:
+                        newval = no;
+                        break;
+                }
+                if (sym_set_tristate_value(sym, newval))
+                        break;
+        } while (oldval != newval);
+        return newval;
+}
+
+bool sym_string_valid(struct symbol *sym, const char *str)
+{
+        char ch;
+
+        switch (sym->type) {
+        case S_STRING:
+                return true;
+        case S_INT:
+                ch = *str++;
+                if (ch == '-')
+                        ch = *str++;
+                if (!isdigit((int)ch))
+                        return false;
+                if (ch == '0' && *str != 0)
+                        return false;
+                while ((ch = *str++)) {
+                        if (!isdigit((int)ch))
+                                return false;
+                }
+                return true;
+        case S_HEX:
+                if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
+                        str += 2;
+                ch = *str++;
+                do {
+                        if (!isxdigit((int)ch))
+                                return false;
+                } while ((ch = *str++));
+                return true;
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                switch (str[0]) {
+                case 'y':
+                case 'Y':
+                        return sym_tristate_within_range(sym, yes);
+                case 'm':
+                case 'M':
+                        return sym_tristate_within_range(sym, mod);
+                case 'n':
+                case 'N':
+                        return sym_tristate_within_range(sym, no);
+                }
+                return false;
+        default:
+                return false;
+        }
+}
+
+bool sym_set_string_value(struct symbol *sym, const char *newval)
+{
+        const char *oldval;
+        char *val;
+        int size;
+
+        switch (sym->type) {
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                switch (newval[0]) {
+                case 'y':
+                case 'Y':
+                        return sym_set_tristate_value(sym, yes);
+                case 'm':
+                case 'M':
+                        return sym_set_tristate_value(sym, mod);
+                case 'n':
+                case 'N':
+                        return sym_set_tristate_value(sym, no);
+                }
+                return false;
+        default:
+                ;
+        }
+
+        if (!sym_string_valid(sym, newval))
+                return false;
+
+        if (sym->flags & SYMBOL_NEW) {
+                sym->flags &= ~SYMBOL_NEW;
+                sym->flags |= SYMBOL_CHANGED;
+        }
+
+        oldval = S_VAL(sym->def);
+        size = strlen(newval) + 1;
+        if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
+                size += 2;
+                S_VAL(sym->def) = val = malloc(size);
+                *val++ = '0';
+                *val++ = 'x';
+        } else if (!oldval || strcmp(oldval, newval))
+                S_VAL(sym->def) = val = malloc(size);
+        else
+                return true;
+
+        strcpy(val, newval);
+        free((void *)oldval);
+        sym_clear_all_valid();
+
+        return true;
+}
+
+const char *sym_get_string_value(struct symbol *sym)
+{
+        tristate val;
+
+        switch (sym->type) {
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                val = sym_get_tristate_value(sym);
+                switch (val) {
+                case no:
+                        return "n";
+                case mod:
+                        return "m";
+                case yes:
+                        return "y";
+                }
+                break;
+        default:
+                ;
+        }
+        return (const char *)S_VAL(sym->curr);
+}
+
+bool sym_is_changable(struct symbol *sym)
+{
+        if (sym->visible == no)
+                return false;
+        /* at least 'n' and 'y'/'m' is selectable */
+        if (sym_is_optional(sym))
+                return true;
+        /* no 'n', so 'y' and 'm' must be selectable */
+        if (sym_get_type(sym) == S_TRISTATE && sym->visible == yes)
+                return true;
+        return false;
+}
+
+struct symbol *sym_lookup(const char *name, int isconst)
+{
+        struct symbol *symbol;
+        const char *ptr;
+        char *new_name;
+        int hash = 0;
+
+        //printf("lookup: %s -> ", name);
+        if (name) {
+                if (name[0] && !name[1]) {
+                        switch (name[0]) {
+                        case 'y': return &symbol_yes;
+                        case 'm': return &symbol_mod;
+                        case 'n': return &symbol_no;
+                        }
+                }
+                for (ptr = name; *ptr; ptr++)
+                        hash += *ptr;
+                hash &= 0xff;
+
+                for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
+                        if (!strcmp(symbol->name, name)) {
+                                if ((isconst && symbol->flags & SYMBOL_CONST) ||
+                                    (!isconst && !(symbol->flags & SYMBOL_CONST))) {
+                                        //printf("h:%p\n", symbol);
+                                        return symbol;
+                                }
+                        }
+                }
+                new_name = strdup(name);
+        } else {
+                new_name = NULL;
+                hash = 256;
+        }
+
+        symbol = malloc(sizeof(*symbol));
+        memset(symbol, 0, sizeof(*symbol));
+        symbol->name = new_name;
+        symbol->type = S_UNKNOWN;
+        symbol->flags = SYMBOL_NEW;
+        if (isconst)
+                symbol->flags |= SYMBOL_CONST;
+
+        symbol->next = symbol_hash[hash];
+        symbol_hash[hash] = symbol;
+
+        //printf("n:%p\n", symbol);
+        return symbol;
+}
+
+struct symbol *sym_find(const char *name)
+{
+        struct symbol *symbol = NULL;
+        const char *ptr;
+        int hash = 0;
+
+        if (!name)
+                return NULL;
+
+        if (name[0] && !name[1]) {
+                switch (name[0]) {
+                case 'y': return &symbol_yes;
+                case 'm': return &symbol_mod;
+                case 'n': return &symbol_no;
+                }
+        }
+        for (ptr = name; *ptr; ptr++)
+                hash += *ptr;
+        hash &= 0xff;
+
+        for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
+                if (!strcmp(symbol->name, name) &&
+                    !(symbol->flags & SYMBOL_CONST))
+                                break;
+        }
+
+        return symbol;
+}
+
+const char *prop_get_type_name(enum prop_type type)
+{
+        switch (type) {
+        case P_PROMPT:
+                return "prompt";
+        case P_COMMENT:
+                return "comment";
+        case P_MENU:
+                return "menu";
+        case P_ROOTMENU:
+                return "rootmenu";
+        case P_DEFAULT:
+                return "default";
+        case P_CHOICE:
+                return "choice";
+        default:
+                return "unknown";
+        }
+}