1 files changed, 771 insertions, 0 deletions

diff --git a/busybox/scripts/config/symbol.c b/busybox/scripts/config/symbol.c
new file mode 100644
index 000000000..a9fae9c13
--- /dev/null
+++ b/busybox/scripts/config/symbol.c
@@ -0,0 +1,771 @@
+/*
+ * 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;
+tristate modules_val;
+
+void sym_add_default(struct symbol *sym, const char *def)
+{
+        struct property *prop = prop_alloc(P_DEFAULT, sym);
+
+        prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
+}
+
+void sym_init(void)
+{
+        struct symbol *sym;
+        char *p;
+        static bool inited = false;
+
+        if (inited)
+                return;
+        inited = true;
+
+        sym = sym_lookup("VERSION", 0);
+        sym->type = S_STRING;
+        sym->flags |= SYMBOL_AUTO;
+        p = getenv("VERSION");
+        if (p)
+                sym_add_default(sym, p);
+
+        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);
+
+}
+
+enum symbol_type sym_get_type(struct symbol *sym)
+{
+        enum symbol_type type = sym->type;
+
+        if (type == S_TRISTATE) {
+                if (sym_is_choice_value(sym) && sym->visible == yes)
+                        type = S_BOOLEAN;
+                else if (modules_val == no)
+                        type = S_BOOLEAN;
+        }
+        return type;
+}
+
+const char *sym_type_name(enum symbol_type 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";
+        case S_OTHER:
+                break;
+        }
+        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;
+
+        for_all_defaults(sym, prop) {
+                prop->visible.tri = expr_calc_value(prop->visible.expr);
+                if (prop->visible.tri != no)
+                        return prop;
+        }
+        return NULL;
+}
+
+struct property *sym_get_range_prop(struct symbol *sym)
+{
+        struct property *prop;
+
+        for_all_properties(sym, prop, P_RANGE) {
+                prop->visible.tri = expr_calc_value(prop->visible.expr);
+                if (prop->visible.tri != no)
+                        return prop;
+        }
+        return NULL;
+}
+
+static void sym_calc_visibility(struct symbol *sym)
+{
+        struct property *prop;
+        tristate tri;
+
+        /* any prompt visible? */
+        tri = no;
+        for_all_prompts(sym, prop) {
+                prop->visible.tri = expr_calc_value(prop->visible.expr);
+                tri = E_OR(tri, prop->visible.tri);
+        }
+        if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
+                tri = yes;
+        if (sym->visible != tri) {
+                sym->visible = tri;
+                sym_set_changed(sym);
+        }
+        if (sym_is_choice_value(sym))
+                return;
+        tri = no;
+        if (sym->rev_dep.expr)
+                tri = expr_calc_value(sym->rev_dep.expr);
+        if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
+                tri = yes;
+        if (sym->rev_dep.tri != tri) {
+                sym->rev_dep.tri = tri;
+                sym_set_changed(sym);
+        }
+}
+
+static struct symbol *sym_calc_choice(struct symbol *sym)
+{
+        struct symbol *def_sym;
+        struct property *prop;
+        struct expr *e;
+
+        /* is the user choice visible? */
+        def_sym = sym->user.val;
+        if (def_sym) {
+                sym_calc_visibility(def_sym);
+                if (def_sym->visible != no)
+                        return def_sym;
+        }
+
+        /* any of the defaults visible? */
+        for_all_defaults(sym, prop) {
+                prop->visible.tri = expr_calc_value(prop->visible.expr);
+                if (prop->visible.tri == no)
+                        continue;
+                def_sym = prop_get_symbol(prop);
+                sym_calc_visibility(def_sym);
+                if (def_sym->visible != no)
+                        return def_sym;
+        }
+
+        /* just get the first visible value */
+        prop = sym_get_choice_prop(sym);
+        for (e = prop->expr; e; e = e->left.expr) {
+                def_sym = e->right.sym;
+                sym_calc_visibility(def_sym);
+                if (def_sym->visible != no)
+                        return def_sym;
+        }
+
+        /* no choice? reset tristate value */
+        sym->curr.tri = no;
+        return NULL;
+}
+
+void sym_calc_value(struct symbol *sym)
+{
+        struct symbol_value newval, oldval;
+        struct property *prop;
+        struct expr *e;
+
+        if (!sym)
+                return;
+
+        if (sym->flags & SYMBOL_VALID)
+                return;
+        sym->flags |= SYMBOL_VALID;
+
+        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:
+                sym->curr.val = sym->name;
+                sym->curr.tri = no;
+                return;
+        }
+        if (!sym_is_choice_value(sym))
+                sym->flags &= ~SYMBOL_WRITE;
+
+        sym_calc_visibility(sym);
+
+        /* set default if recursively called */
+        sym->curr = newval;
+
+        switch (sym_get_type(sym)) {
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                if (sym_is_choice_value(sym) && sym->visible == yes) {
+                        prop = sym_get_choice_prop(sym);
+                        newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
+                } else if (E_OR(sym->visible, sym->rev_dep.tri) != no) {
+                        sym->flags |= SYMBOL_WRITE;
+                        if (sym_has_value(sym))
+                                newval.tri = sym->user.tri;
+                        else if (!sym_is_choice(sym)) {
+                                prop = sym_get_default_prop(sym);
+                                if (prop)
+                                        newval.tri = expr_calc_value(prop->expr);
+                        }
+                        newval.tri = E_OR(E_AND(newval.tri, sym->visible), sym->rev_dep.tri);
+                } else if (!sym_is_choice(sym)) {
+                        prop = sym_get_default_prop(sym);
+                        if (prop) {
+                                sym->flags |= SYMBOL_WRITE;
+                                newval.tri = expr_calc_value(prop->expr);
+                        }
+                }
+                if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
+                        newval.tri = yes;
+                break;
+        case S_STRING:
+        case S_HEX:
+        case S_INT:
+                if (sym->visible != no) {
+                        sym->flags |= SYMBOL_WRITE;
+                        if (sym_has_value(sym)) {
+                                newval.val = sym->user.val;
+                                break;
+                        }
+                }
+                prop = sym_get_default_prop(sym);
+                if (prop) {
+                        struct symbol *ds = prop_get_symbol(prop);
+                        if (ds) {
+                                sym->flags |= SYMBOL_WRITE;
+                                sym_calc_value(ds);
+                                newval.val = ds->curr.val;
+                        }
+                }
+                break;
+        default:
+                ;
+        }
+
+        sym->curr = newval;
+        if (sym_is_choice(sym) && newval.tri == yes)
+                sym->curr.val = sym_calc_choice(sym);
+
+        if (memcmp(&oldval, &sym->curr, sizeof(oldval)))
+                sym_set_changed(sym);
+        if (modules_sym == sym)
+                modules_val = modules_sym->curr.tri;
+
+        if (sym_is_choice(sym)) {
+                int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
+                prop = sym_get_choice_prop(sym);
+                for (e = prop->expr; e; e = e->left.expr) {
+                        e->right.sym->flags |= flags;
+                        if (flags & SYMBOL_CHANGED)
+                                sym_set_changed(e->right.sym);
+                }
+        }
+}
+
+void sym_clear_all_valid(void)
+{
+        struct symbol *sym;
+        int i;
+
+        for_all_symbols(i, sym)
+                sym->flags &= ~SYMBOL_VALID;
+        sym_change_count++;
+        if (modules_sym)
+                sym_calc_value(modules_sym);
+}
+
+void sym_set_changed(struct symbol *sym)
+{
+        struct property *prop;
+
+        sym->flags |= SYMBOL_CHANGED;
+        for (prop = sym->prop; prop; prop = prop->next) {
+                if (prop->menu)
+                        prop->menu->flags |= MENU_CHANGED;
+        }
+}
+
+void sym_set_all_changed(void)
+{
+        struct symbol *sym;
+        int i;
+
+        for_all_symbols(i, sym)
+                sym_set_changed(sym);
+}
+
+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;
+
+        if (type == S_BOOLEAN && val == mod)
+                return false;
+        if (sym->visible <= sym->rev_dep.tri)
+                return false;
+        if (sym_is_choice_value(sym) && sym->visible == yes)
+                return val == yes;
+        return val >= sym->rev_dep.tri && val <= sym->visible;
+}
+
+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_set_changed(sym);
+        }
+        if (sym_is_choice_value(sym) && val == yes) {
+                struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
+
+                cs->user.val = sym;
+                cs->flags &= ~SYMBOL_NEW;
+        }
+
+        sym->user.tri = 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(ch))
+                        return false;
+                if (ch == '0' && *str != 0)
+                        return false;
+                while ((ch = *str++)) {
+                        if (!isdigit(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(ch))
+                                return false;
+                } while ((ch = *str++));
+                return true;
+        case S_BOOLEAN:
+        case S_TRISTATE:
+                switch (str[0]) {
+                case 'y': case 'Y':
+                case 'm': case 'M':
+                case 'n': case 'N':
+                        return true;
+                }
+                return false;
+        default:
+                return false;
+        }
+}
+
+bool sym_string_within_range(struct symbol *sym, const char *str)
+{
+        struct property *prop;
+        int val;
+
+        switch (sym->type) {
+        case S_STRING:
+                return sym_string_valid(sym, str);
+        case S_INT:
+                if (!sym_string_valid(sym, str))
+                        return false;
+                prop = sym_get_range_prop(sym);
+                if (!prop)
+                        return true;
+                val = strtol(str, NULL, 10);
+                return val >= strtol(prop->expr->left.sym->name, NULL, 10) &&
+                       val <= strtol(prop->expr->right.sym->name, NULL, 10);
+        case S_HEX:
+                if (!sym_string_valid(sym, str))
+                        return false;
+                prop = sym_get_range_prop(sym);
+                if (!prop)
+                        return true;
+                val = strtol(str, NULL, 16);
+                return val >= strtol(prop->expr->left.sym->name, NULL, 16) &&
+                       val <= strtol(prop->expr->right.sym->name, NULL, 16);
+        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_within_range(sym, newval))
+                return false;
+
+        if (sym->flags & SYMBOL_NEW) {
+                sym->flags &= ~SYMBOL_NEW;
+                sym_set_changed(sym);
+        }
+
+        oldval = sym->user.val;
+        size = strlen(newval) + 1;
+        if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
+                size += 2;
+                sym->user.val = val = malloc(size);
+                *val++ = '0';
+                *val++ = 'x';
+        } else if (!oldval || strcmp(oldval, newval))
+                sym->user.val = 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 *)sym->curr.val;
+}
+
+bool sym_is_changable(struct symbol *sym)
+{
+        return sym->visible > sym->rev_dep.tri;
+}
+
+struct symbol *sym_lookup(const char *name, int isconst)
+{
+        struct symbol *symbol;
+        const char *ptr;
+        char *new_name;
+        int hash = 0;
+
+        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)))
+                                        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;
+
+        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;
+}
+
+struct symbol *sym_check_deps(struct symbol *sym);
+
+static struct symbol *sym_check_expr_deps(struct expr *e)
+{
+        struct symbol *sym;
+
+        if (!e)
+                return NULL;
+        switch (e->type) {
+        case E_OR:
+        case E_AND:
+                sym = sym_check_expr_deps(e->left.expr);
+                if (sym)
+                        return sym;
+                return sym_check_expr_deps(e->right.expr);
+        case E_NOT:
+                return sym_check_expr_deps(e->left.expr);
+        case E_EQUAL:
+        case E_UNEQUAL:
+                sym = sym_check_deps(e->left.sym);
+                if (sym)
+                        return sym;
+                return sym_check_deps(e->right.sym);
+        case E_SYMBOL:
+                return sym_check_deps(e->left.sym);
+        default:
+                break;
+        }
+        printf("Oops! How to check %d?\n", e->type);
+        return NULL;
+}
+
+struct symbol *sym_check_deps(struct symbol *sym)
+{
+        struct symbol *sym2;
+        struct property *prop;
+
+        if (sym->flags & SYMBOL_CHECK_DONE)
+                return NULL;
+        if (sym->flags & SYMBOL_CHECK) {
+                printf("Warning! Found recursive dependency: %s", sym->name);
+                return sym;
+        }
+
+        sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
+        sym2 = sym_check_expr_deps(sym->rev_dep.expr);
+        if (sym2)
+                goto out;
+
+        for (prop = sym->prop; prop; prop = prop->next) {
+                if (prop->type == P_CHOICE || prop->type == P_SELECT)
+                        continue;
+                sym2 = sym_check_expr_deps(prop->visible.expr);
+                if (sym2)
+                        goto out;
+                if (prop->type != P_DEFAULT || sym_is_choice(sym))
+                        continue;
+                sym2 = sym_check_expr_deps(prop->expr);
+                if (sym2)
+                        goto out;
+        }
+out:
+        if (sym2)
+                printf(" %s", sym->name);
+        sym->flags &= ~SYMBOL_CHECK;
+        return sym2;
+}
+
+struct property *prop_alloc(enum prop_type type, struct symbol *sym)
+{
+        struct property *prop;
+        struct property **propp;
+
+        prop = malloc(sizeof(*prop));
+        memset(prop, 0, sizeof(*prop));
+        prop->type = type;
+        prop->sym = sym;
+        prop->file = current_file;
+        prop->lineno = zconf_lineno();
+
+        /* append property to the prop list of symbol */
+        if (sym) {
+                for (propp = &sym->prop; *propp; propp = &(*propp)->next)
+                        ;
+                *propp = prop;
+        }
+
+        return prop;
+}
+
+struct symbol *prop_get_symbol(struct property *prop)
+{
+        if (prop->expr && (prop->expr->type == E_SYMBOL ||
+                           prop->expr->type == E_CHOICE))
+                return prop->expr->left.sym;
+        return NULL;
+}
+
+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_DEFAULT:
+                return "default";
+        case P_CHOICE:
+                return "choice";
+        case P_SELECT:
+                return "select";
+        case P_RANGE:
+                return "range";
+        case P_UNKNOWN:
+                break;
+        }
+        return "unknown";
+}