FM / kconfig

/usr/src/linux-headers-5.15.0-190-generic/scripts/kconfig/

/usr/src/linux-headers-5.15.0-190-generic/scripts/kconfig

Name	Size	Mode	Actions
lxdialog/	-	0755	rm
tests/	-	0755	rm
.conf.cmd	291	0644	edit dl rm
.conf.o.cmd	761	0644	edit dl rm
.confdata.o.cmd	838	0644	edit dl rm
.expr.o.cmd	761	0644	edit dl rm
.lexer.lex.c.cmd	130	0644	edit dl rm
.lexer.lex.o.cmd	829	0644	edit dl rm
.menu.o.cmd	825	0644	edit dl rm
.parser.tab.h.cmd	177	0644	edit dl rm
.parser.tab.o.cmd	903	0644	edit dl rm
.preprocess.o.cmd	821	0644	edit dl rm
.symbol.o.cmd	781	0644	edit dl rm
.util.o.cmd	761	0644	edit dl rm
conf	145520	0755	edit dl rm
conf.c	20558	0644	edit dl rm
conf.o	27848	0644	edit dl rm
confdata.c	23334	0644	edit dl rm
confdata.o	25736	0644	edit dl rm
expr.c	30249	0644	edit dl rm
expr.h	9653	0644	edit dl rm
expr.o	24856	0644	edit dl rm
gconf-cfg.sh	775	0755	edit dl rm
gconf.c	38975	0644	edit dl rm
gconf.glade	25642	0644	edit dl rm
images.c	6573	0644	edit dl rm
images.h	857	0644	edit dl rm
internal.h	172	0644	edit dl rm
lexer.l	9259	0644	edit dl rm
lexer.lex.c	115380	0644	edit dl rm
lexer.lex.o	49544	0644	edit dl rm
list.h	3749	0644	edit dl rm
lkc.h	4044	0644	edit dl rm
lkc_proto.h	2013	0644	edit dl rm
Makefile	7788	0644	edit dl rm
mconf-cfg.sh	1502	0755	edit dl rm
mconf.c	27888	0644	edit dl rm
menu.c	22090	0644	edit dl rm
menu.o	21144	0644	edit dl rm
merge_config.sh	5181	0755	edit dl rm
nconf-cfg.sh	1404	0755	edit dl rm
nconf.c	38875	0644	edit dl rm
nconf.gui.c	14911	0644	edit dl rm
nconf.h	2050	0644	edit dl rm
parser.tab.c	73309	0644	edit dl rm
parser.tab.h	5118	0644	edit dl rm
parser.tab.o	42960	0644	edit dl rm
parser.y	15608	0644	edit dl rm
preprocess.c	11334	0644	edit dl rm
preprocess.o	12088	0644	edit dl rm
qconf-cfg.sh	643	0755	edit dl rm
qconf.cc	44467	0644	edit dl rm
qconf.h	6552	0644	edit dl rm
streamline_config.pl	16821	0755	edit dl rm
symbol.c	29410	0644	edit dl rm
symbol.o	26552	0644	edit dl rm
util.c	2210	0644	edit dl rm
util.o	5104	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/scripts/kconfig/preprocess.c (11334B)

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>

#include <ctype.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "list.h"
#include "lkc.h"

#define ARRAY_SIZE(arr)		(sizeof(arr) / sizeof((arr)[0]))

static char *expand_string_with_args(const char *in, int argc, char *argv[]);
static char *expand_string(const char *in);

static void __attribute__((noreturn)) pperror(const char *format, ...)
{
	va_list ap;

fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
	va_start(ap, format);
	vfprintf(stderr, format, ap);
	va_end(ap);
	fprintf(stderr, "\n");

exit(1);
}

/*
 * Environment variables
 */
static LIST_HEAD(env_list);

struct env {
	char *name;
	char *value;
	struct list_head node;
};

static void env_add(const char *name, const char *value)
{
	struct env *e;

e = xmalloc(sizeof(*e));
	e->name = xstrdup(name);
	e->value = xstrdup(value);

list_add_tail(&e->node, &env_list);
}

static void env_del(struct env *e)
{
	list_del(&e->node);
	free(e->name);
	free(e->value);
	free(e);
}

/* The returned pointer must be freed when done */
static char *env_expand(const char *name)
{
	struct env *e;
	const char *value;

if (!*name)
		return NULL;

list_for_each_entry(e, &env_list, node) {
		if (!strcmp(name, e->name))
			return xstrdup(e->value);
	}

value = getenv(name);
	if (!value)
		return NULL;

/*
	 * We need to remember all referenced environment variables.
	 * They will be written out to include/config/auto.conf.cmd
	 */
	env_add(name, value);

return xstrdup(value);
}

void env_write_dep(FILE *f, const char *autoconfig_name)
{
	struct env *e, *tmp;

list_for_each_entry_safe(e, tmp, &env_list, node) {
		fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
		fprintf(f, "%s: FORCE\n", autoconfig_name);
		fprintf(f, "endif\n");
		env_del(e);
	}
}

/*
 * Built-in functions
 */
struct function {
	const char *name;
	unsigned int min_args;
	unsigned int max_args;
	char *(*func)(int argc, char *argv[]);
};

static char *do_error_if(int argc, char *argv[])
{
	if (!strcmp(argv[0], "y"))
		pperror("%s", argv[1]);

return xstrdup("");
}

static char *do_filename(int argc, char *argv[])
{
	return xstrdup(current_file->name);
}

static char *do_info(int argc, char *argv[])
{
	printf("%s\n", argv[0]);

return xstrdup("");
}

static char *do_lineno(int argc, char *argv[])
{
	char buf[16];

sprintf(buf, "%d", yylineno);

return xstrdup(buf);
}

static char *do_shell(int argc, char *argv[])
{
	FILE *p;
	char buf[4096];
	char *cmd;
	size_t nread;
	int i;

cmd = argv[0];

p = popen(cmd, "r");
	if (!p) {
		perror(cmd);
		exit(1);
	}

nread = fread(buf, 1, sizeof(buf), p);
	if (nread == sizeof(buf))
		nread--;

/* remove trailing new lines */
	while (nread > 0 && buf[nread - 1] == '\n')
		nread--;

buf[nread] = 0;

/* replace a new line with a space */
	for (i = 0; i < nread; i++) {
		if (buf[i] == '\n')
			buf[i] = ' ';
	}

if (pclose(p) == -1) {
		perror(cmd);
		exit(1);
	}

return xstrdup(buf);
}

static char *do_warning_if(int argc, char *argv[])
{
	if (!strcmp(argv[0], "y"))
		fprintf(stderr, "%s:%d: %s\n",
			current_file->name, yylineno, argv[1]);

return xstrdup("");
}

static const struct function function_table[] = {
	/* Name		MIN	MAX	Function */
	{ "error-if",	2,	2,	do_error_if },
	{ "filename",	0,	0,	do_filename },
	{ "info",	1,	1,	do_info },
	{ "lineno",	0,	0,	do_lineno },
	{ "shell",	1,	1,	do_shell },
	{ "warning-if",	2,	2,	do_warning_if },
};

#define FUNCTION_MAX_ARGS		16

static char *function_expand(const char *name, int argc, char *argv[])
{
	const struct function *f;
	int i;

for (i = 0; i < ARRAY_SIZE(function_table); i++) {
		f = &function_table[i];
		if (strcmp(f->name, name))
			continue;

if (argc < f->min_args)
			pperror("too few function arguments passed to '%s'",
				name);

if (argc > f->max_args)
			pperror("too many function arguments passed to '%s'",
				name);

return f->func(argc, argv);
	}

return NULL;
}

/*
 * Variables (and user-defined functions)
 */
static LIST_HEAD(variable_list);

struct variable {
	char *name;
	char *value;
	enum variable_flavor flavor;
	int exp_count;
	struct list_head node;
};

static struct variable *variable_lookup(const char *name)
{
	struct variable *v;

list_for_each_entry(v, &variable_list, node) {
		if (!strcmp(name, v->name))
			return v;
	}

return NULL;
}

static char *variable_expand(const char *name, int argc, char *argv[])
{
	struct variable *v;
	char *res;

v = variable_lookup(name);
	if (!v)
		return NULL;

if (argc == 0 && v->exp_count)
		pperror("Recursive variable '%s' references itself (eventually)",
			name);

if (v->exp_count > 1000)
		pperror("Too deep recursive expansion");

v->exp_count++;

if (v->flavor == VAR_RECURSIVE)
		res = expand_string_with_args(v->value, argc, argv);
	else
		res = xstrdup(v->value);

v->exp_count--;

return res;
}

void variable_add(const char *name, const char *value,
		  enum variable_flavor flavor)
{
	struct variable *v;
	char *new_value;
	bool append = false;

v = variable_lookup(name);
	if (v) {
		/* For defined variables, += inherits the existing flavor */
		if (flavor == VAR_APPEND) {
			flavor = v->flavor;
			append = true;
		} else {
			free(v->value);
		}
	} else {
		/* For undefined variables, += assumes the recursive flavor */
		if (flavor == VAR_APPEND)
			flavor = VAR_RECURSIVE;

v = xmalloc(sizeof(*v));
		v->name = xstrdup(name);
		v->exp_count = 0;
		list_add_tail(&v->node, &variable_list);
	}

v->flavor = flavor;

if (flavor == VAR_SIMPLE)
		new_value = expand_string(value);
	else
		new_value = xstrdup(value);

if (append) {
		v->value = xrealloc(v->value,
				    strlen(v->value) + strlen(new_value) + 2);
		strcat(v->value, " ");
		strcat(v->value, new_value);
		free(new_value);
	} else {
		v->value = new_value;
	}
}

static void variable_del(struct variable *v)
{
	list_del(&v->node);
	free(v->name);
	free(v->value);
	free(v);
}

void variable_all_del(void)
{
	struct variable *v, *tmp;

list_for_each_entry_safe(v, tmp, &variable_list, node)
		variable_del(v);
}

/*
 * Evaluate a clause with arguments.  argc/argv are arguments from the upper
 * function call.
 *
 * Returned string must be freed when done
 */
static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
{
	char *tmp, *name, *res, *endptr, *prev, *p;
	int new_argc = 0;
	char *new_argv[FUNCTION_MAX_ARGS];
	int nest = 0;
	int i;
	unsigned long n;

tmp = xstrndup(str, len);

/*
	 * If variable name is '1', '2', etc.  It is generally an argument
	 * from a user-function call (i.e. local-scope variable).  If not
	 * available, then look-up global-scope variables.
	 */
	n = strtoul(tmp, &endptr, 10);
	if (!*endptr && n > 0 && n <= argc) {
		res = xstrdup(argv[n - 1]);
		goto free_tmp;
	}

prev = p = tmp;

/*
	 * Split into tokens
	 * The function name and arguments are separated by a comma.
	 * For example, if the function call is like this:
	 *   $(foo,$(x),$(y))
	 *
	 * The input string for this helper should be:
	 *   foo,$(x),$(y)
	 *
	 * and split into:
	 *   new_argv[0] = 'foo'
	 *   new_argv[1] = '$(x)'
	 *   new_argv[2] = '$(y)'
	 */
	while (*p) {
		if (nest == 0 && *p == ',') {
			*p = 0;
			if (new_argc >= FUNCTION_MAX_ARGS)
				pperror("too many function arguments");
			new_argv[new_argc++] = prev;
			prev = p + 1;
		} else if (*p == '(') {
			nest++;
		} else if (*p == ')') {
			nest--;
		}

p++;
	}

if (new_argc >= FUNCTION_MAX_ARGS)
		pperror("too many function arguments");
	new_argv[new_argc++] = prev;

/*
	 * Shift arguments
	 * new_argv[0] represents a function name or a variable name.  Put it
	 * into 'name', then shift the rest of the arguments.  This simplifies
	 * 'const' handling.
	 */
	name = expand_string_with_args(new_argv[0], argc, argv);
	new_argc--;
	for (i = 0; i < new_argc; i++)
		new_argv[i] = expand_string_with_args(new_argv[i + 1],
						      argc, argv);

/* Search for variables */
	res = variable_expand(name, new_argc, new_argv);
	if (res)
		goto free;

/* Look for built-in functions */
	res = function_expand(name, new_argc, new_argv);
	if (res)
		goto free;

/* Last, try environment variable */
	if (new_argc == 0) {
		res = env_expand(name);
		if (res)
			goto free;
	}

res = xstrdup("");
free:
	for (i = 0; i < new_argc; i++)
		free(new_argv[i]);
	free(name);
free_tmp:
	free(tmp);

return res;
}

/*
 * Expand a string that follows '$'
 *
 * For example, if the input string is
 *     ($(FOO)$($(BAR)))$(BAZ)
 * this helper evaluates
 *     $($(FOO)$($(BAR)))
 * and returns a new string containing the expansion (note that the string is
 * recursively expanded), also advancing 'str' to point to the next character
 * after the corresponding closing parenthesis, in this case, *str will be
 *     $(BAR)
 */
static char *expand_dollar_with_args(const char **str, int argc, char *argv[])
{
	const char *p = *str;
	const char *q;
	int nest = 0;

/*
	 * In Kconfig, variable/function references always start with "$(".
	 * Neither single-letter variables as in $A nor curly braces as in ${CC}
	 * are supported.  '$' not followed by '(' loses its special meaning.
	 */
	if (*p != '(') {
		*str = p;
		return xstrdup("$");
	}

p++;
	q = p;
	while (*q) {
		if (*q == '(') {
			nest++;
		} else if (*q == ')') {
			if (nest-- == 0)
				break;
		}
		q++;
	}

if (!*q)
		pperror("unterminated reference to '%s': missing ')'", p);

/* Advance 'str' to after the expanded initial portion of the string */
	*str = q + 1;

return eval_clause(p, q - p, argc, argv);
}

char *expand_dollar(const char **str)
{
	return expand_dollar_with_args(str, 0, NULL);
}

static char *__expand_string(const char **str, bool (*is_end)(char c),
			     int argc, char *argv[])
{
	const char *in, *p;
	char *expansion, *out;
	size_t in_len, out_len;

out = xmalloc(1);
	*out = 0;
	out_len = 1;

p = in = *str;

while (1) {
		if (*p == '$') {
			in_len = p - in;
			p++;
			expansion = expand_dollar_with_args(&p, argc, argv);
			out_len += in_len + strlen(expansion);
			out = xrealloc(out, out_len);
			strncat(out, in, in_len);
			strcat(out, expansion);
			free(expansion);
			in = p;
			continue;
		}

if (is_end(*p))
			break;

p++;
	}

in_len = p - in;
	out_len += in_len;
	out = xrealloc(out, out_len);
	strncat(out, in, in_len);

/* Advance 'str' to the end character */
	*str = p;

return out;
}

static bool is_end_of_str(char c)
{
	return !c;
}

/*
 * Expand variables and functions in the given string.  Undefined variables
 * expand to an empty string.
 * The returned string must be freed when done.
 */
static char *expand_string_with_args(const char *in, int argc, char *argv[])
{
	return __expand_string(&in, is_end_of_str, argc, argv);
}

static char *expand_string(const char *in)
{
	return expand_string_with_args(in, 0, NULL);
}

static bool is_end_of_token(char c)
{
	return !(isalnum(c) || c == '_' || c == '-');
}

/*
 * Expand variables in a token.  The parsing stops when a token separater
 * (in most cases, it is a whitespace) is encountered.  'str' is updated to
 * point to the next character.
 *
 * The returned string must be freed when done.
 */
char *expand_one_token(const char **str)
{
	return __expand_string(str, is_end_of_token, 0, NULL);
}

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