source: debwrt/trunk/config/mconf/symbol.c @ 1

/*
 * 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 <regex.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;
        struct utsname uts;
        char *p;
        static bool inited = false;

        if (inited)
                return;
        inited = true;

        uname(&uts);

        sym = sym_lookup("ARCH", 0);
        sym->type = S_STRING;
        sym->flags |= SYMBOL_AUTO;
        p = getenv("ARCH");
        if (p)
                sym_add_default(sym, p);

        sym = sym_lookup("OPENWRTVERSION", 0);
        sym->type = S_STRING;
        sym->flags |= SYMBOL_AUTO;
        p = getenv("OPENWRTVERSION");
        if (p)
                sym_add_default(sym, p);

        sym = sym_lookup("UNAME_RELEASE", 0);
        sym->type = S_STRING;
        sym->flags |= SYMBOL_AUTO;
        sym_add_default(sym, uts.release);
}

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;
/* tristate always enabled */
#if 0
                else if (modules_val == no)
                        type = S_BOOLEAN;
#endif
        }
        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 int sym_get_range_val(struct symbol *sym, int base)
{
        sym_calc_value(sym);
        switch (sym->type) {
        case S_INT:
                base = 10;
                break;
        case S_HEX:
                base = 16;
                break;
        default:
                break;
        }
        return strtol(sym->curr.val, NULL, base);
}

static void sym_validate_range(struct symbol *sym)
{
        struct property *prop;
        int base, val, val2;
        char str[64];

        switch (sym->type) {
        case S_INT:
                base = 10;
                break;
        case S_HEX:
                base = 16;
                break;
        default:
                return;
        }
        prop = sym_get_range_prop(sym);
        if (!prop)
                return;
        val = strtol(sym->curr.val, NULL, base);
        val2 = sym_get_range_val(prop->expr->left.sym, base);
        if (val >= val2) {
                val2 = sym_get_range_val(prop->expr->right.sym, base);
                if (val <= val2)
                        return;
        }
        if (sym->type == S_INT)
                sprintf(str, "%d", val2);
        else
                sprintf(str, "0x%x", val2);
        sym->curr.val = strdup(str);
}

static void sym_calc_visibility(struct symbol *sym)
{
        struct property *prop;
        tristate tri;
        int deselected = 0;

        /* 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))
                tri = yes;
        if (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
                tri = no;
                deselected = 1;
        }
        if (sym->visible != tri) {
                sym->visible = tri;
                sym_set_changed(sym);
        }
        if (sym_is_choice_value(sym) || deselected)
                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 (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
                        newval.tri = 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);
        sym_validate_range(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);
        }
        /*
         * setting a choice value also resets the new flag of the choice
         * symbol and all other choice values.
         */
        if (sym_is_choice_value(sym) && val == yes) {
                struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
                struct property *prop;
                struct expr *e;

                cs->user.val = sym;
                cs->flags &= ~SYMBOL_NEW;
                prop = sym_get_choice_prop(cs);
                for (e = prop->expr; e; e = e->left.expr) {
                        if (e->right.sym->visible != no)
                                e->right.sym->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)
{
        signed 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 >= sym_get_range_val(prop->expr->left.sym, 10) &&
                       val <= sym_get_range_val(prop->expr->right.sym, 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 >= sym_get_range_val(prop->expr->left.sym, 16) &&
                       val <= sym_get_range_val(prop->expr->right.sym, 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_re_search(const char *pattern)
{
        struct symbol *sym, **sym_arr = NULL;
        int i, cnt, size;
        regex_t re;

        cnt = size = 0;
        /* Skip if empty */
        if (strlen(pattern) == 0)
                return NULL;
        if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
                return NULL;

        for_all_symbols(i, sym) {
                if (sym->flags & SYMBOL_CONST || !sym->name)
                        continue;
                if (regexec(&re, sym->name, 0, NULL, 0))
                        continue;
                if (cnt + 1 >= size) {
                        void *tmp = sym_arr;
                        size += 16;
                        sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
                        if (!sym_arr) {
                                free(tmp);
                                return NULL;
                        }
                }
                sym_arr[cnt++] = sym;
        }
        if (sym_arr)
                sym_arr[cnt] = NULL;
        regfree(&re);

        return sym_arr;
}


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) {
                printf("Warning! Found recursive dependency: %s", sym->name);
                return sym;
        }
        if (sym->flags & SYMBOL_CHECKED)
                return NULL;

        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 || prop->type == P_DESELECT)
                        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);
                if (sym2 == sym) {
                        printf("\n");
                        sym2 = NULL;
                }
        }
        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_DESELECT:
                return "deselect";
        case P_RANGE:
                return "range";
        case P_UNKNOWN:
                break;
        }
        return "unknown";
}