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GNU-ncurses库简介

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前言

busybox终端图形化配置界面，和内核的相似

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总结

进程启动，准备数据调用子程序
子程序负责渲染

line [0]: ./scripts/kconfig/lxdialog/lxdialog

line [1]: --backtitle

line [2]: BusyBox 1.37.0 Configuration

line [3]: --title

line [4]: README

line [5]: --textbox

line [6]: .help.tmp

line [7]: 40

line [8]: 96

backtitle(BusyBox 1.37.0 Configuration)
---------------------------------------title(README)
menu_instructions
+-------------------------------------
| textbox read from temp file .help.tmp
|
+line [7]: height
line [8]: width

char* args[1024] = {bufptr1, bufptr2...}
**argptr = args+-----------------
| buf
+-----------------^
|
bufptr

显示内容通过文件配置，主进程负责读取和解析Config.in，并为子进程生成要渲染的数据，子进程负责实际的渲染工作。

内容配置文件有简单的语法定义

void conf_parse(const char *name);
// 解析 conf_parse 文件struct expr {enum expr_type type;union expr_data left, right;
};
struct property {struct property *next;struct symbol *sym;enum prop_type type;const char *text;    // 显示的文本 Busybox Configurationstruct expr_value visible;struct expr *expr;   // struct menu *menu;struct file *file;int lineno;
};
struct symbol {struct symbol *next;  // 用于 hash 冲突的表链char *name;           // sym namechar *help;enum symbol_type type;   // 符号的数据类型struct symbol_value curr, user;tristate visible;int flags;             // 一些flagstruct property *prop;  // 属性链表，新增属性放入链表后面struct expr *dep, *dep2;struct expr_value rev_dep;
};1. zconf_initscan(name); 打开文件 current_file指向它
2. sym_init();struct symbol *sym_lookup(const char *name, int isconst)从 struct symbol *symbol_hash[257]; 中找到name对应的符号，若找到则返回，否则放入hash table"ARCH", 0   "KERNELVERSION", 0  "UNAME_RELEASE", 0初始化3符号
3. void menu_init(void)此时menu为空4.	struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep)conf_read(NULL);

保存文件的结构

[glogal] file_list is a list point to headstruct file {struct file *next;struct file *parent;char *name;int lineno;int flags;
};

父进程的主要初始化操作：

setlocale(LC_ALL, "");bindtextdomain(PACKAGE, LOCALEDIR);textdomain(PACKAGE);tcgetattr(1, &ios_org);void init_wsize(void); 检查窗口大小conf(&rootmenu); loop here  子进程 fd=2为管道写端

lxdialog分析

argc = 5
argv[4]
offset < 4

offset = 0 1 2 3^

xx --title title-name --backtitle name --yesno txt prompt 16 141
offset+1 offset+2 ^

–title title-name --backtitle name --yesno promt 30 30

Config.in文件修改示例

部分 xxx/Config.in文件是从代码中的注释生成的

#
# For a description of the syntax of this configuration file,
# see docs/Kconfig-language.txt.
#mainmenu "Configuration"config HAVE_DOT_CONFIGbooldefault ymenu "Settings"choiceprompt "Additional debugging library"default NO_DEBUG_LIBhelpUsing an additional debugging library will make busybox becomeconsiderably larger and will cause it to run more slowly. Youshould always leave this option disabled for production use.dmalloc support:----------------This enables compiling with dmalloc ( http://dmalloc.com/ )which is an excellent public domain mem leak and malloc problemdetector. To enable dmalloc, before running busybox you willwant to properly set your environment, for example:export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfileThe 'debug=' value is generated using the following commanddmalloc -p log-stats -p log-non-free -p log-bad-space \-p log-elapsed-time -p check-fence -p check-heap \-p check-lists -p check-blank -p check-funcs -p realloc-copy \-p allow-free-nullElectric-fence support:-----------------------This enables compiling with Electric-fence support. Electricfence is another very useful malloc debugging library which usesyour computer's virtual memory hardware to detect illegal memoryaccesses. This support will make busybox be considerably largerand run slower, so you should leave this option disabled unlessyou are hunting a hard to find memory problem.config NO_DEBUG_LIBbool "None"config DMALLOCbool "Dmalloc"config EFENCEbool "Electric-fence"endchoice#source libbb/Config.inendmenucomment "Appletsxx"
comment "UserDefined2"#source init/Config.in#source archival/Config.in
#source coreutils/Config.in
#source console-tools/Config.in#source debianutils/Config.in
source klibc-utils/Config.in
#source editors/Config.in#source findutils/Config.in
#source loginutils/Config.in
#source e2fsprogs/Config.in
#source modutils/Config.in
#source util-linux/Config.in
#source miscutils/Config.in
#source networking/Config.in
#source printutils/Config.in
#source mailutils/Config.in
#source procps/Config.in
#source runit/Config.in
#source selinux/Config.in
#ource shell/Config.in
#source sysklogd/Config.in