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confdata.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
*/
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "internal.h"
#include "lkc.h"
struct gstr autoconf_cmd;
/* return true if 'path' exists, false otherwise */
static bool is_present(const char *path)
{
struct stat st;
return !stat(path, &st);
}
/* return true if 'path' exists and it is a directory, false otherwise */
static bool is_dir(const char *path)
{
struct stat st;
if (stat(path, &st))
return false;
return S_ISDIR(st.st_mode);
}
/* return true if the given two files are the same, false otherwise */
static bool is_same(const char *file1, const char *file2)
{
int fd1, fd2;
struct stat st1, st2;
void *map1, *map2;
bool ret = false;
fd1 = open(file1, O_RDONLY);
if (fd1 < 0)
return ret;
fd2 = open(file2, O_RDONLY);
if (fd2 < 0)
goto close1;
ret = fstat(fd1, &st1);
if (ret)
goto close2;
ret = fstat(fd2, &st2);
if (ret)
goto close2;
if (st1.st_size != st2.st_size)
goto close2;
map1 = mmap(NULL, st1.st_size, PROT_READ, MAP_PRIVATE, fd1, 0);
if (map1 == MAP_FAILED)
goto close2;
map2 = mmap(NULL, st2.st_size, PROT_READ, MAP_PRIVATE, fd2, 0);
if (map2 == MAP_FAILED)
goto close2;
if (bcmp(map1, map2, st1.st_size))
goto close2;
ret = true;
close2:
close(fd2);
close1:
close(fd1);
return ret;
}
/*
* Create the parent directory of the given path.
*
* For example, if 'include/config/auto.conf' is given, create 'include/config'.
*/
static int make_parent_dir(const char *path)
{
char tmp[PATH_MAX + 1];
char *p;
strncpy(tmp, path, sizeof(tmp));
tmp[sizeof(tmp) - 1] = 0;
/* Remove the base name. Just return if nothing is left */
p = strrchr(tmp, '/');
if (!p)
return 0;
*(p + 1) = 0;
/* Just in case it is an absolute path */
p = tmp;
while (*p == '/')
p++;
while ((p = strchr(p, '/'))) {
*p = 0;
/* skip if the directory exists */
if (!is_dir(tmp) && mkdir(tmp, 0755))
return -1;
*p = '/';
while (*p == '/')
p++;
}
return 0;
}
static char depfile_path[PATH_MAX];
static size_t depfile_prefix_len;
/* touch depfile for symbol 'name' */
static int conf_touch_dep(const char *name)
{
int fd;
/* check overflow: prefix + name + '\0' must fit in buffer. */
if (depfile_prefix_len + strlen(name) + 1 > sizeof(depfile_path))
return -1;
strcpy(depfile_path + depfile_prefix_len, name);
fd = open(depfile_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1)
return -1;
close(fd);
return 0;
}
static void conf_warning(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
static void conf_message(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
static const char *conf_filename;
static int conf_lineno, conf_warnings;
bool conf_errors(void)
{
if (conf_warnings)
return getenv("KCONFIG_WERROR");
return false;
}
static void conf_warning(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
conf_warnings++;
}
static void conf_default_message_callback(const char *s)
{
printf("#\n# ");
printf("%s", s);
printf("\n#\n");
}
static void (*conf_message_callback)(const char *s) =
conf_default_message_callback;
void conf_set_message_callback(void (*fn)(const char *s))
{
conf_message_callback = fn;
}
static void conf_message(const char *fmt, ...)
{
va_list ap;
char buf[4096];
if (!conf_message_callback)
return;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
conf_message_callback(buf);
va_end(ap);
}
const char *conf_get_configname(void)
{
char *name = getenv("KCONFIG_CONFIG");
return name ? name : ".config";
}
static const char *conf_get_autoconfig_name(void)
{
char *name = getenv("KCONFIG_AUTOCONFIG");
return name ? name : "include/config/auto.conf";
}
static const char *conf_get_autoheader_name(void)
{
char *name = getenv("KCONFIG_AUTOHEADER");
return name ? name : "include/generated/autoconf.h";
}
static const char *conf_get_rustccfg_name(void)
{
char *name = getenv("KCONFIG_RUSTCCFG");
return name ? name : "include/generated/rustc_cfg";
}
static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
{
char *p2;
switch (sym->type) {
case S_TRISTATE:
if (p[0] == 'm') {
sym->def[def].tri = mod;
sym->flags |= def_flags;
break;
}
/* fall through */
case S_BOOLEAN:
if (p[0] == 'y') {
sym->def[def].tri = yes;
sym->flags |= def_flags;
break;
}
if (p[0] == 'n') {
sym->def[def].tri = no;
sym->flags |= def_flags;
break;
}
if (def != S_DEF_AUTO)
conf_warning("symbol value '%s' invalid for %s",
p, sym->name);
return 1;
case S_STRING:
/* No escaping for S_DEF_AUTO (include/config/auto.conf) */
if (def != S_DEF_AUTO) {
if (*p++ != '"')
break;
for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
if (*p2 == '"') {
*p2 = 0;
break;
}
memmove(p2, p2 + 1, strlen(p2));
}
if (!p2) {
conf_warning("invalid string found");
return 1;
}
}
/* fall through */
case S_INT:
case S_HEX:
if (sym_string_valid(sym, p)) {
sym->def[def].val = xstrdup(p);
sym->flags |= def_flags;
} else {
if (def != S_DEF_AUTO)
conf_warning("symbol value '%s' invalid for %s",
p, sym->name);
return 1;
}
break;
default:
;
}
return 0;
}
/* like getline(), but the newline character is stripped away */
static ssize_t getline_stripped(char **lineptr, size_t *n, FILE *stream)
{
ssize_t len;
len = getline(lineptr, n, stream);
if (len > 0 && (*lineptr)[len - 1] == '\n') {
len--;
(*lineptr)[len] = '\0';
if (len > 0 && (*lineptr)[len - 1] == '\r') {
len--;
(*lineptr)[len] = '\0';
}
}
return len;
}
int conf_read_simple(const char *name, int def)
{
FILE *in = NULL;
char *line = NULL;
size_t line_asize = 0;
char *p, *val;
struct symbol *sym;
int def_flags;
const char *warn_unknown, *sym_name;
warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
if (name) {
in = zconf_fopen(name);
} else {
char *env;
name = conf_get_configname();
in = zconf_fopen(name);
if (in)
goto load;
conf_set_changed(true);
env = getenv("KCONFIG_DEFCONFIG_LIST");
if (!env)
return 1;
while (1) {
bool is_last;
while (isspace(*env))
env++;
if (!*env)
break;
p = env;
while (*p && !isspace(*p))
p++;
is_last = (*p == '\0');
*p = '\0';
in = zconf_fopen(env);
if (in) {
conf_message("using defaults found in %s",
env);
goto load;
}
if (is_last)
break;
env = p + 1;
}
}
if (!in)
return 1;
load:
conf_filename = name;
conf_lineno = 0;
conf_warnings = 0;
def_flags = SYMBOL_DEF << def;
for_all_symbols(sym) {
sym->flags |= SYMBOL_CHANGED;
sym->flags &= ~(def_flags|SYMBOL_VALID);
if (sym_is_choice(sym))
sym->flags |= def_flags;
switch (sym->type) {
case S_INT:
case S_HEX:
case S_STRING:
free(sym->def[def].val);
/* fall through */
default:
sym->def[def].val = NULL;
sym->def[def].tri = no;
}
}
while (getline_stripped(&line, &line_asize, in) != -1) {
conf_lineno++;
if (!line[0]) /* blank line */
continue;
if (line[0] == '#') {
if (line[1] != ' ')
continue;
p = line + 2;
if (memcmp(p, CONFIG_, strlen(CONFIG_)))
continue;
sym_name = p + strlen(CONFIG_);
p = strchr(sym_name, ' ');
if (!p)
continue;
*p++ = 0;
if (strcmp(p, "is not set"))
continue;
val = "n";
} else {
if (memcmp(line, CONFIG_, strlen(CONFIG_))) {
conf_warning("unexpected data: %s", line);
continue;
}
sym_name = line + strlen(CONFIG_);
p = strchr(sym_name, '=');
if (!p) {
conf_warning("unexpected data: %s", line);
continue;
}
*p = 0;
val = p + 1;
}
sym = sym_find(sym_name);
if (!sym) {
if (def == S_DEF_AUTO) {
/*
* Reading from include/config/auto.conf.
* If CONFIG_FOO previously existed in auto.conf
* but it is missing now, include/config/FOO
* must be touched.
*/
conf_touch_dep(sym_name);
} else {
if (warn_unknown)
conf_warning("unknown symbol: %s", sym_name);
conf_set_changed(true);
}
continue;
}
if (sym->flags & def_flags)
conf_warning("override: reassigning to symbol %s", sym->name);
if (conf_set_sym_val(sym, def, def_flags, val))
continue;
if (sym && sym_is_choice_value(sym)) {
struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
switch (sym->def[def].tri) {
case no:
break;
case mod:
if (cs->def[def].tri == yes) {
conf_warning("%s creates inconsistent choice state", sym->name);
cs->flags &= ~def_flags;
}
break;
case yes:
if (cs->def[def].tri != no)
conf_warning("override: %s changes choice state", sym->name);
cs->def[def].val = sym;
break;
}
cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
}
}
free(line);
fclose(in);
return 0;
}
int conf_read(const char *name)
{
struct symbol *sym;
int conf_unsaved = 0;
conf_set_changed(false);
if (conf_read_simple(name, S_DEF_USER)) {
sym_calc_value(modules_sym);
return 1;
}
sym_calc_value(modules_sym);
for_all_symbols(sym) {
sym_calc_value(sym);
if (sym_is_choice(sym) || (sym->flags & SYMBOL_NO_WRITE))
continue;
if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
/* check that calculated value agrees with saved value */
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
if (sym->def[S_DEF_USER].tri == sym_get_tristate_value(sym))
continue;
break;
default:
if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
continue;
break;
}
} else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
/* no previous value and not saved */
continue;
conf_unsaved++;
/* maybe print value in verbose mode... */
}
for_all_symbols(sym) {
if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
/* Reset values of generates values, so they'll appear
* as new, if they should become visible, but that
* doesn't quite work if the Kconfig and the saved
* configuration disagree.
*/
if (sym->visible == no && !conf_unsaved)
sym->flags &= ~SYMBOL_DEF_USER;
switch (sym->type) {
case S_STRING:
case S_INT:
case S_HEX:
/* Reset a string value if it's out of range */
if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
break;
sym->flags &= ~SYMBOL_VALID;
conf_unsaved++;
break;
default:
break;
}
}
}
if (conf_warnings || conf_unsaved)
conf_set_changed(true);
return 0;
}
struct comment_style {
const char *decoration;
const char *prefix;
const char *postfix;
};
static const struct comment_style comment_style_pound = {
.decoration = "#",
.prefix = "#",
.postfix = "#",
};
static const struct comment_style comment_style_c = {
.decoration = " *",
.prefix = "/*",
.postfix = " */",
};
static void conf_write_heading(FILE *fp, const struct comment_style *cs)
{
if (!cs)
return;
fprintf(fp, "%s\n", cs->prefix);
fprintf(fp, "%s Automatically generated file; DO NOT EDIT.\n",
cs->decoration);
fprintf(fp, "%s %s\n", cs->decoration, rootmenu.prompt->text);
fprintf(fp, "%s\n", cs->postfix);
}
/* The returned pointer must be freed on the caller side */
static char *escape_string_value(const char *in)
{
const char *p;
char *out;
size_t len;
len = strlen(in) + strlen("\"\"") + 1;
p = in;
while (1) {
p += strcspn(p, "\"\\");
if (p[0] == '\0')
break;
len++;
p++;
}
out = xmalloc(len);
out[0] = '\0';
strcat(out, "\"");
p = in;
while (1) {
len = strcspn(p, "\"\\");
strncat(out, p, len);
p += len;
if (p[0] == '\0')
break;
strcat(out, "\\");
strncat(out, p++, 1);
}
strcat(out, "\"");
return out;
}
enum output_n { OUTPUT_N, OUTPUT_N_AS_UNSET, OUTPUT_N_NONE };
static void __print_symbol(FILE *fp, struct symbol *sym, enum output_n output_n,
bool escape_string)
{
const char *val;
char *escaped = NULL;
if (sym->type == S_UNKNOWN)
return;
val = sym_get_string_value(sym);
if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
output_n != OUTPUT_N && *val == 'n') {
if (output_n == OUTPUT_N_AS_UNSET)
fprintf(fp, "# %s%s is not set\n", CONFIG_, sym->name);
return;
}
if (sym->type == S_STRING && escape_string) {
escaped = escape_string_value(val);
val = escaped;
}
fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, val);
free(escaped);
}
static void print_symbol_for_dotconfig(FILE *fp, struct symbol *sym)
{
__print_symbol(fp, sym, OUTPUT_N_AS_UNSET, true);
}
static void print_symbol_for_autoconf(FILE *fp, struct symbol *sym)
{
__print_symbol(fp, sym, OUTPUT_N_NONE, false);
}
void print_symbol_for_listconfig(struct symbol *sym)
{
__print_symbol(stdout, sym, OUTPUT_N, true);
}
static void print_symbol_for_c(FILE *fp, struct symbol *sym)
{
const char *val;
const char *sym_suffix = "";
const char *val_prefix = "";
char *escaped = NULL;
if (sym->type == S_UNKNOWN)
return;
val = sym_get_string_value(sym);
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
switch (*val) {
case 'n':
return;
case 'm':
sym_suffix = "_MODULE";
/* fall through */
default:
val = "1";
}
break;
case S_HEX:
if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
val_prefix = "0x";
break;
case S_STRING:
escaped = escape_string_value(val);
val = escaped;
default:
break;
}
fprintf(fp, "#define %s%s%s %s%s\n", CONFIG_, sym->name, sym_suffix,
val_prefix, val);
free(escaped);
}
static void print_symbol_for_rustccfg(FILE *fp, struct symbol *sym)
{
const char *val;
const char *val_prefix = "";
char *val_prefixed = NULL;
size_t val_prefixed_len;
char *escaped = NULL;
if (sym->type == S_UNKNOWN)
return;
val = sym_get_string_value(sym);
switch (sym->type) {
case S_BOOLEAN:
case S_TRISTATE:
/*
* We do not care about disabled ones, i.e. no need for
* what otherwise are "comments" in other printers.
*/
if (*val == 'n')
return;
/*
* To have similar functionality to the C macro `IS_ENABLED()`
* we provide an empty `--cfg CONFIG_X` here in both `y`
* and `m` cases.
*
* Then, the common `fprintf()` below will also give us
* a `--cfg CONFIG_X="y"` or `--cfg CONFIG_X="m"`, which can
* be used as the equivalent of `IS_BUILTIN()`/`IS_MODULE()`.
*/
fprintf(fp, "--cfg=%s%s\n", CONFIG_, sym->name);
break;
case S_HEX:
if (val[0] != '0' || (val[1] != 'x' && val[1] != 'X'))
val_prefix = "0x";
break;
default:
break;
}
if (strlen(val_prefix) > 0) {
val_prefixed_len = strlen(val) + strlen(val_prefix) + 1;
val_prefixed = xmalloc(val_prefixed_len);
snprintf(val_prefixed, val_prefixed_len, "%s%s", val_prefix, val);
val = val_prefixed;
}
/* All values get escaped: the `--cfg` option only takes strings */
escaped = escape_string_value(val);
val = escaped;
fprintf(fp, "--cfg=%s%s=%s\n", CONFIG_, sym->name, val);
free(escaped);
free(val_prefixed);
}
/*
* Write out a minimal config.
* All values that has default values are skipped as this is redundant.
*/
int conf_write_defconfig(const char *filename)
{
struct symbol *sym;
struct menu *menu;
FILE *out;
out = fopen(filename, "w");
if (!out)
return 1;
sym_clear_all_valid();
/* Traverse all menus to find all relevant symbols */
menu = rootmenu.list;
while (menu != NULL)
{
sym = menu->sym;
if (sym && !sym_is_choice(sym)) {
sym_calc_value(sym);
if (!(sym->flags & SYMBOL_WRITE))
goto next_menu;
sym->flags &= ~SYMBOL_WRITE;
/* If we cannot change the symbol - skip */
if (!sym_is_changeable(sym))
goto next_menu;
/* If symbol equals to default value - skip */
if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
goto next_menu;
/*
* If symbol is a choice value and equals to the
* default for a choice - skip.
* But only if value is bool and equal to "y" and
* choice is not "optional".
* (If choice is "optional" then all values can be "n")
*/
if (sym_is_choice_value(sym)) {
struct symbol *cs;
struct symbol *ds;
cs = prop_get_symbol(sym_get_choice_prop(sym));
ds = sym_choice_default(cs);
if (!sym_is_optional(cs) && sym == ds) {
if ((sym->type == S_BOOLEAN) &&
sym_get_tristate_value(sym) == yes)
goto next_menu;
}
}
print_symbol_for_dotconfig(out, sym);
}
next_menu:
if (menu->list != NULL) {
menu = menu->list;
}
else if (menu->next != NULL) {
menu = menu->next;
} else {
while ((menu = menu->parent)) {
if (menu->next != NULL) {
menu = menu->next;
break;
}
}
}
}
fclose(out);
return 0;
}
int conf_write(const char *name)
{
FILE *out;
struct symbol *sym;
struct menu *menu;
const char *str;
char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
char *env;
bool need_newline = false;
if (!name)
name = conf_get_configname();
if (!*name) {
fprintf(stderr, "config name is empty\n");
return -1;
}
if (is_dir(name)) {
fprintf(stderr, "%s: Is a directory\n", name);
return -1;
}
if (make_parent_dir(name))
return -1;
env = getenv("KCONFIG_OVERWRITECONFIG");
if (env && *env) {
*tmpname = 0;
out = fopen(name, "w");
} else {
snprintf(tmpname, sizeof(tmpname), "%s.%d.tmp",
name, (int)getpid());
out = fopen(tmpname, "w");
}
if (!out)
return 1;
conf_write_heading(out, &comment_style_pound);
if (!conf_get_changed())
sym_clear_all_valid();
menu = rootmenu.list;
while (menu) {
sym = menu->sym;
if (!sym) {
if (!menu_is_visible(menu))
goto next;
str = menu_get_prompt(menu);
fprintf(out, "\n"
"#\n"
"# %s\n"
"#\n", str);
need_newline = false;
} else if (!(sym->flags & SYMBOL_CHOICE) &&
!(sym->flags & SYMBOL_WRITTEN)) {
sym_calc_value(sym);
if (!(sym->flags & SYMBOL_WRITE))
goto next;
if (need_newline) {
fprintf(out, "\n");
need_newline = false;
}
sym->flags |= SYMBOL_WRITTEN;
print_symbol_for_dotconfig(out, sym);
}
next:
if (menu->list) {
menu = menu->list;
continue;
}
end_check:
if (!menu->sym && menu_is_visible(menu) && menu != &rootmenu &&
menu->prompt->type == P_MENU) {
fprintf(out, "# end of %s\n", menu_get_prompt(menu));
need_newline = true;
}
if (menu->next) {
menu = menu->next;
} else {
menu = menu->parent;
if (menu)
goto end_check;
}
}
fclose(out);
for_all_symbols(sym)
sym->flags &= ~SYMBOL_WRITTEN;
if (*tmpname) {
if (is_same(name, tmpname)) {
conf_message("No change to %s", name);
unlink(tmpname);
conf_set_changed(false);
return 0;
}
snprintf(oldname, sizeof(oldname), "%s.old", name);
rename(name, oldname);
if (rename(tmpname, name))
return 1;
}
conf_message("configuration written to %s", name);
conf_set_changed(false);
return 0;
}
/* write a dependency file as used by kbuild to track dependencies */
static int conf_write_autoconf_cmd(const char *autoconf_name)
{
char name[PATH_MAX], tmp[PATH_MAX];
FILE *out;
int ret;
ret = snprintf(name, sizeof(name), "%s.cmd", autoconf_name);
if (ret >= sizeof(name)) /* check truncation */
return -1;
if (make_parent_dir(name))
return -1;
ret = snprintf(tmp, sizeof(tmp), "%s.cmd.tmp", autoconf_name);
if (ret >= sizeof(tmp)) /* check truncation */
return -1;
out = fopen(tmp, "w");
if (!out) {
perror("fopen");
return -1;
}
fprintf(out, "autoconfig := %s\n", autoconf_name);
fputs(str_get(&autoconf_cmd), out);
fflush(out);
ret = ferror(out); /* error check for all fprintf() calls */
fclose(out);
if (ret)