tag:blogger.com,1999:blog-59921314157817652692024-08-28T04:26:39.138-07:00Shawn's GarageStay hungry, stay foolish.Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.comBlogger32125tag:blogger.com,1999:blog-5992131415781765269.post-57135687316552380182011-12-07T02:02:00.001-08:002011-12-07T02:04:26.069-08:00Linux Kernel Indent Rule.This is the sample for programmer to reference.
We can find the Linux Indent Rule in usr/src/linux-headers-2.6.32-35/scripts/Lindent
And the indent rule is:
indent -npro -kr -i8 -ts8 -sob -l80 -ss -ncs -cp1
-npro, --ignore-profile
Do not read `.indent.pro' files.
-kr, --k-and-r-style
Use Kernighan & Ritchie coding style.
-in, --indent-leveln
Set indentation level to n spaces.
-tsn, -Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-63509439177904379242011-11-17T00:41:00.001-08:002011-11-17T00:41:51.428-08:00VIM with tagsUsing vim coding program for a long time.
It's a very good tool "ctags" to work with vim when coding.
Create tags
#ctags -R *
Naming tags
#ctags -R * -f tagName
In vim, using below command to setting PATH of tags:
:set tags=./tags,../tags
or
:set tags=tags;
Add ; can recursive search tags from parent folder.Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-73187477463079483712011-11-10T02:36:00.001-08:002011-11-10T02:36:32.472-08:00[C/C++ basic] Preprocessing #if defined(SHAWN)It's lot of usage same as #ifdef
Like #if defined(...)
When using #if defined(...)
we can used logic AND/OR for preprocessing.
Sample 1:
#ifdef ABC
// do something
#elif DEF
// do something
#else
// do something else
#endif
Sample 1 above can be simply recoding as:
#if defined(ABC) || defined(DEF)
//do something
#else
// do something else
#endif
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-75722201310825906332011-11-04T03:15:00.001-07:002011-11-04T03:15:23.242-07:00[C/C++ basic] Preprocessing #ifdef, #elif, #elseToday I using C/C++ preprocessor to compile my code,
But I have a little confuse about "is #elif can work correctly with #ifdef"?
#ifdef TEST_IFDEF
printf("Test #ifdef");
#elif TEST_ELIF
printf("Test #elif");
#else
printf("Test #else");
#endif
And after my trying.
It's work well :DShawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com1tag:blogger.com,1999:blog-5992131415781765269.post-21197561349479450502011-09-26T23:39:00.001-07:002011-09-26T23:39:43.428-07:00[C/C++]switch-case with range?There is an interesting discussed after today study group.
Is C/C++ support switch-case with range of integer!?
Let see a example :
//===================
switch (a)
{
case 1 ... 10:
//do somthing
break;
case 11 ... 20:
//do somthing
break;
default:
//do something
break;
}
//===================
This is successfully with gcc compiler.
But not done with VC++
That's because Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-15744467907680099472011-04-19T00:04:00.001-07:002011-04-19T00:04:32.949-07:00Using mii-tool/ethtools to sniff status of network interfaceWhen I am trying using mii-tool on my new develop environment,
Some error occur, and the log message like below:
# mii-tool -V
mii-tool.c 1.9 2000/04/28 00:56:08 (David Hinds)
SIOCGMIIPHY on 'eth0' failed: Operation not supported
no MII interfaces found
Then I google this problem find out,
mii-tool has lot of bug, and some net drivers didn't support it.
So, I am trying using ethtool which haveShawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-53817189427169580042011-04-13T20:18:00.001-07:002011-04-13T20:18:54.647-07:00Mac OS disable/enable .DS_StoreMac OS will create .DS_Store on Network Disk.
And it would confused the other operation system user.
This is the way to disable auto create .DS_Store.
defaults write com.apple.desktopservices DSDontWriteNetworkStores true Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-32475274528749568402011-04-13T05:09:00.001-07:002011-04-13T05:09:20.262-07:00vbindiff : Good tools for compare binary files.vbindiff is a graphical windows tools for compare binary file.
It can easy find out what bytes different in ASCII or EBCDIC mode.
more information in manual page :)
SYNOPSIS
vbindiff file1 [ file2 ]
DESCRIPTION
Movement Keys
-------------
Up Move one line (16 bytes) towards the beginning of the file
Down Move one line (16 bytes) towards the end Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-90445018686312631792011-04-12T02:54:00.001-07:002011-04-12T02:54:54.143-07:00SD card automount for Embedded LinuxIf we want to using SD card auto mount.
Please reference manual page of command "mdev".
# mdev --helpBusyBox v1.18.4 (2011-04-01 22:32:35 CST) multi-call binary.Usage: mdev [-s] -s Scan /sys and populate /dev during system bootIt can be run by kernel as a hotplug helper. To activate it: echo /sbin/mdev > /proc/sys/kernel/hotplug
It uses /etc/mdev.conf with lines[-]DEVNAME UID:GID PERM [Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-24557015286769629452011-04-11T20:51:00.001-07:002011-04-11T20:51:28.388-07:00Bash Introduction (4/12)4/12 Present in Alphanetworks.
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-82392300737184932622011-02-13T19:42:00.001-08:002011-02-13T19:42:41.963-08:00The chr() in Ruby.Cause I have to write bytes string using Ruby.
I collation some rules of chr() to clarify my mind.
At first. create new file.
file = File.new("helloRuby", "w+")
There are three way to get the same result :
file.write(65.chr)
file.write(Integer(0x41).chr)
file.write("A")
upon three all get the hexdump result like :
00000000 41 |A|
And if using Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-75846079467688830842011-02-08T23:59:00.001-08:002011-02-08T23:59:09.829-08:00Cannot identify SD card partition! (mmcblk0: unknown partition table )Situation :
When I plug-in my SD card into some EVB board.
SD driver can detect mmcblk0, but cannot detect SD partition.
like below:
# mmc0: new high speed SDHC card at address f7c1
mmcblk0: mmc0:f7c1 SD08G 3.50 GiB
mmcblk0: unknown partition table
But if I want to mount SD card to some folder,
I'll need to identify partition of SD card file system.
Solution :
After tracing...
Only need Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-81752858471127250432010-09-27T21:19:00.000-07:002010-09-27T21:20:25.690-07:00UNIX Programming9/28 Present at Alpha networks.
Reference Books:
Advanced Programming in the UNIX Environment 2nd.
(W. Richard Stevens & Stephen A. Rago)
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-27247271267918360142010-09-06T03:37:00.000-07:002010-09-06T03:37:51.954-07:00Linux Man-Pages Release - 3.26Linux Man-Pages 3.26 release.
Download from git :
git clone git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
Downliad tarball
http://www.kernel.org/pub/linux/docs/man-pages/Archive/
Release Notes:
http://www.kernel.org/doc/man-pages/changelog.html#release_3.26Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-74487421902705734542010-08-22T21:07:00.000-07:002010-08-22T21:07:02.191-07:00Vim plugin - Doxygen# 1. DoxygenToolkit.vim
let g:doxygenToolkit_authorName="your name"
Usages:
:Dox
:DoxAuthor
:DoxBlock
:DoxUndoc(DEBUG)
:DoxLic
# 2. Doxygen.vim
cd ~/.vim/after/syntax;
ln -s doxygen.vim c.vim;
ln -s doxygen.vim cpp.vim;
ln -s doxygen.vim java.vim;
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-40153710211496087762010-08-10T00:53:00.000-07:002010-08-10T00:53:31.537-07:00vimgrep
:vimgrep /pattern/[g][j] file1 file2 ... fileN
vimgrep is using to search pattern from following filelist.
vimgrep accept to ignore case,
If want to using this feature, put /\c in the pattern to ignore case.
ex: vimgrep /pattern\c/ filename
or put /\C in the pattern to match it.
ex: vimgrep /PaTtErn\c/ filename
Without flag 'j', vim jumps to the first match.
With flag Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-66735038449460944382010-07-19T02:27:00.000-07:002010-07-19T02:27:40.728-07:00vim 一次註解多行
使用VIM時, 註解多行的方式如下:
1. 進入 command mode ,
2. 按ctrl-V, 然後圈選要註解的區塊
3. 按 I 進入 Insert mode
4. 鍵入註解符號或要輸入的內容
5. 按 ESC 兩次, 就可以看到輸入的註解已經套用在所選擇的那幾行
note: 步驟三的 I 可以替換成 A, 這樣就會變成在行尾註解
在C/C++ 註解多行其實可以透過下面的方式簡單完成,
但 VIM 的多行註解則適用於各式語言喔！
#if 0
... 要註解的部份
#endif
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-4077294115641752162010-07-19T02:20:00.000-07:002010-07-19T02:20:40.529-07:00vim 加密功能Command Line 底下執行 VIM 時, 加上 -X 即可開啟檔案加密模式.
# vim -X [檔名]
這樣 vim 在開啟檔案時會要求使用者輸入密碼, 若原本沒有密碼, 則會要求建立密碼.
若密碼輸入錯誤, 同樣可以開啟檔案, 不過內容會呈現亂碼.
加密功能亦可以在編輯檔案時, 透過 :x 指令來加密.
不過要注意檔案在編輯時, vim 自動產生的 swap 檔案是沒有加密的,
因此在編輯檔案時可以考慮將 swap 功能關閉.
使用方法如下：
#vim -X 檔名 -n
或是檔案編輯中使用 :set noswf即可.Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-21981495726412842792010-03-29T22:51:00.000-07:002010-03-29T22:56:13.838-07:00Apple release Mac OS X 10.6.3 with QuickTime X, OpenGL improvements昨天蘋果釋出 Mac OS 10.6.3 更新雪豹作業系統,
主要改進了QuickTime X 和 OpenGL-base應用程式定址相容性問題.
蘋果建議使用Snow Leopard 的使用者 update 到 10.6.3 版,
這次的更新共佔 437.2 MB的空間.
概略更新的項目如下：
Improves the reliability and compatibility of QuickTime X
Addresses compatibility issues with OpenGL-based applications
Addresses an issue that causes background message colors to display incorrectly in Mail
Resolves an issue that Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-49300105533895476012010-03-26T01:48:00.000-07:002010-03-28T23:43:35.007-07:00Transport Stream Format.簡介：
Transport Stream (傳輸串流) 簡稱 TS, 主要根據 ITU-T Rec. H.262 | ISO/IEC 13818-2 and ISO/IEC 13818-3制定而成.
Transport Stream 包含了一個或以上的 Program (節目),
Program 由 Video , Audio 和節目資訊(PSI) 組成,
而 Video 和 Audio 的 Elementary Stream 將被拆解裝載到 PES Packets.
而 PSI 則分為四種如下所列：
Program Association Table
Program Map Table
Conditional Access Table
Network Information Table
TS 結構分析 ：
TS 的長度是固定的, 每個 TS Packet 都是Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com1tag:blogger.com,1999:blog-5992131415781765269.post-19699161858577713792010-03-25T00:55:00.001-07:002010-03-25T02:57:14.392-07:00Standard I/O RedirectionLinux 提供三種 I/O Streams 給程式使用
STDIN (0) : default is keyboard.
STDOUT (1) : default is terminal.
STDERR (2) : default is terminal.
而 STDOUT 和 STDERR 可以被重新導向至檔案 ( I/O Redirection ), 作法如下：
$ binary > (將 STDOUT 重新導向)
$ binary 2> (將 STDERR 重新導向)
$ binary &> (將所有輸出重新導向)
$ binary 2>&1 (將 STDERR 重新導向至 STDOUT)
$ binary >&2 (將STDOUT 重新導向至 STDERR)Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-8246915069893775952010-03-14T09:36:00.001-07:002010-03-26T03:14:17.965-07:00Linux 底下處理減號開頭的檔案名稱在 Linux 底下, 由於減號(-) 通常都被來利用為指令的 Option,
因此若我們執行檔案處理的指令時,
若遇到減號開頭的檔名 (Example : -filename)
則通常會無法順利執行,
例如:
$ rm -filename
$ mv -filename filename
$ cp -filename filename
這幾個執行的結果都是失敗的!
遇到這種情況我們通常可以透過 ./ 或是 -- 來解決：
$ cp ./-filename filename
$ rm -- filename
當然啦,在UNIX底下, 減號是非常常用的特殊符號, 極度不建議拿來命名檔案或資料夾,
但若真的遇到這種狀況的話, 就透過以上的方式來處理囉 :)
Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-71485036543384225672010-03-09T01:50:00.000-08:002010-03-25T02:45:08.916-07:00X over ssh一般我們遠端使用 Linux or Unix 主機時,常常是透過 telnet 或是 ssh 來做文字模式的操作 如果我們希望遠端使用 Linux 或是 Unix 系統的圖形介面,
常用的方式有 VNC, 另一種就是透過 ssh 來啟動 X 圖形介面.
X 視窗系統(目前版本為 X11) 提供了圖形介面來代替文字操作介面, 多數 Unix-linx 的作業系統都有支援,
ssh 則是使用 Secure shell, 透過網路來做兩台主機間的溝通. 可以在加密的狀態下使兩台有ssh的裝置透過網路連接 如果我們透過 ssh 使用 X windows system,
就可以透過遠端連線來使用圖形話GUI介面,
要使用 X over ssh 要先準備幾個項目
1. 首先在本機端 (local) 安裝 X server
2. 遠端系統必須預先安裝 xterm, xeyes, xcalc, Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-88740742345113674112010-03-04T00:53:00.000-08:002010-03-25T02:44:09.772-07:00Vim SessionVim 7 除了相當好用的 Vim Tab Pages 功能外,
也能搭配 mksession 來儲存目前 Vim 的狀態,
例如,每次工作實都開了一些Vim Tab Pages,
或是設定了一些 .vimrc 中非預設的設定
但關掉 Terminal 後就通通消失,
Tab Page要重開, 設定也要重新設定過,
這時候就可以利用 mksession的功能囉！
:mksession 預設會幫你在目前的目錄底下產生 Session.vim
裡面記錄了已經開啟的 Tab 資訊以及其他設定,
也可以用縮寫 :mks
下次開始 Vim 時, 只要加上 -S Session.vim,
或是開啟 Vim 後使用 :source Session.vim,
就能恢復上次工作的狀態了:)
當然,也可以自己決定Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0tag:blogger.com,1999:blog-5992131415781765269.post-80749196936934288702010-02-07T18:30:00.000-08:002010-03-04T00:54:21.334-08:00Vim Tab Page 功能Vim Tab功能：
:tae[dit] or tabnew + filename 開新 tab page
:tabc
:tabc[lose] {count}
:tabo[nly]
:tabn[ext] 下一個tab
:tabp[revious] 上一個tab
:tabm[move] [N] 移動目前的Tab Page順序到第N頁, 若N為0則移動到第一頁.
:tabfind filename* 尋找當前目錄檔案filename開頭的檔名
:tabs 列出以開啟的tab
:tabdo %s/foo/boo/g 將開啟的tab中所有foo替換成boo
Note that : Tab Page 是 Vim 7 開始加入的新功能
--Shawn Linhttp://www.blogger.com/profile/10290383585359704381noreply@blogger.com0