view kconfig/symbol.c @ 953:13916d161ec0

xzcat: remove XZ_(PREALLOC|SINGLE), inline xz_dec_bcj_create Because we only use XZ_DYNALLOC, there's a bunch of dead code. This patch removes the #ifdef's and if()s associated with support for multiple modes. single_call was only used to store the mode; it is no longer needed. A little bit of reorganization was needed to reduce the number of prototypes. Documentation associated with dead code was dropped. There are still some relics of multiple modes in the continued presence of "XZ_DYNALLOC" and xz_mode. Additionally, I inlined xz_dec_bcj_create; it was called once. This loses about 125 lines, mostly comments.
author Isaac Dunham <idunham@lavabit.com>
date Wed, 17 Jul 2013 17:25:07 -0500
parents 4d21d59f3206
children
line wrap: on
line source

/*
 * 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_CONST|SYMBOL_VALID,
}, symbol_mod = {
	.name = "m",
	.curr = { "m", mod },
	.flags = SYMBOL_CONST|SYMBOL_VALID,
}, symbol_no = {
	.name = "n",
	.curr = { "n", no },
	.flags = SYMBOL_CONST|SYMBOL_VALID,
}, symbol_empty = {
	.name = "",
	.curr = { "", no },
	.flags = SYMBOL_VALID,
};

int sym_change_count;
struct symbol *sym_defconfig_list;
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("KERNELVERSION", 0);
	sym->type = S_STRING;
	sym->flags |= SYMBOL_AUTO;
	p = getenv("KERNELVERSION");
	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;
		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 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;

	/* 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->def[S_DEF_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->def[S_DEF_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->def[S_DEF_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) {
			sym_set_all_changed();
			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_DEF_USER)) {
		sym->flags |= SYMBOL_DEF_USER;
		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->def[S_DEF_USER].val = sym;
		cs->flags |= SYMBOL_DEF_USER;
		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_DEF_USER;
		}
	}

	sym->def[S_DEF_USER].tri = val;
	if (oldval != val)
		sym_clear_all_valid();

	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_DEF_USER)) {
		sym->flags |= SYMBOL_DEF_USER;
		sym_set_changed(sym);
	}

	oldval = sym->def[S_DEF_USER].val;
	size = strlen(newval) + 1;
	if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
		size += 2;
		sym->def[S_DEF_USER].val = val = malloc(size);
		*val++ = '0';
		*val++ = 'x';
	} else if (!oldval || strcmp(oldval, newval))
		sym->def[S_DEF_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;
	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)
			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_RANGE:
		return "range";
	case P_UNKNOWN:
		break;
	}
	return "unknown";
}