避風港

真的有避風港，還在淡水...


檢視較大的地圖

Get cpu cores number in linux

Output:
cpu count: 4

1. #include <stdlib.h>
2. #include <stdio.h>
3. #include <string.h>
5. int main() {
6.     int num = 1;
7.     char key[512], deli[512], value[512];
8.     FILE* fd = fopen("/proc/cpuinfo", "r");
10.     if(fd != 0)
11.     {
12.         while(!feof(fd))
13.         {
14.             memset(key, 0, sizeof(key));
15.             memset(value, 0, sizeof(value));
16.             fscanf(fd, "%s%s%[^\n]", key, deli, value);
17.             if(strcmp(key, "processor") == 0)
18.             {
19.                 sscanf(value, "%d", &num);
20.                 num++; /* processor index is 0, 1.... should add 1 */
21.             }
22.         }
23.         fclose(fd);
24.     }
26.     printf("cpu count: %d\n", num);
27.     return 0;
28. }

smtp over starttls

Beware, "\r\n" means the return key right after you issue a command.

C:\>telnet smtp.gmail.com 587

220 mx.google.com ESMTP nh6sm29764930pbc.44

Then input

EHLO\r\n

250-mx.google.com at your service, [114.34.198.249]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250 ENHANCEDSTATUSCODES

STARTTLS\r\n

220 2.0.0 Ready to start TLS

And then SSL connect should be established.

Size of memory allocation(malloc) for c language

From: BASIC programming forum - "C": Size of memory allocated to a pointer?


#include <stdio.h> 
#include <stdlib.h> 
#include <alloc.h> 

void *my_alloc(int size) {
    int *block;

    /* bump up request so we have a place to store the size */
    block = malloc(size+sizeof(int));
    if (block == NULL)
        return NULL;

    /* store the size */
    *block = size;
    /* and return pointer to next place (automatically scaled) */
    return block + 1;
}

void my_free(void *block0) {
    int *block = block0;

    /* go back to the actual allocation address */
    block--;
    free(block);
}

int my_msize(void *block0) {
    int *block;

    /* back up to the size of the block */
    block = (int *)block0 - 1;

    return *block;
}

int main() {
    char *p;
    int rc;

    p = my_alloc(50);
    printf("Size of p is %d\n", my_msize(p));
    my_free(p);
    return 0;
}

c# hex str transformation

Form looks like this...

Code is below...

1. using System;
2. using System.Collections.Generic;
3. using System.Collections;
4. using System.ComponentModel;
5. using System.Data;
6. using System.Drawing;
7. using System.Text;
8. using System.Windows.Forms;
9.  
10. namespace StrHex
11. {
12.     public partial class Form1 : Form
13.     {
14.         public Form1()
15.         {
16.             InitializeComponent();
17.         }
18.  
19.         private void Form1_Load(object sender, EventArgs e)
20.         {
21.             EncodingInfo[] infos = Encoding.GetEncodings();
22.             for (int i = 0; i < infos.Length; i++)
23.                 comboBox1.Items.Add(string.Format("{0} - {1}", infos[i].DisplayName, infos[i].Name));
24.  
25.             if (comboBox1.Items.Count > 0)
26.                 comboBox1.SelectedIndex = 0;
27.         }
28.  
29.         private void button1_Click(object sender, EventArgs e)
30.         {
31.             string name = comboBox1.Text.Split(new string[] {" - "}, StringSplitOptions.None)[1];
32.             Encoding encode = Encoding.GetEncoding(name);
33.             if (encode != null)
34.             {
35.                 Byte[] bs = encode.GetBytes(textBox1.Text);
36.                 if (bs.Length * 2 > textBox1.MaxLength)
37.                     return;
38.  
39.                 StringBuilder sb = new StringBuilder();
40.                 foreach (Byte b in bs)
41.                     sb.AppendFormat("{0:X2}", b);
42.                 textBox1.Text = sb.ToString();
43.             }
44.         }
45.  
46.         private void button2_Click(object sender, EventArgs e)
47.         {
48.             string name = comboBox1.Text.Split(new string[] {" - "}, StringSplitOptions.None)[1];
49.             Encoding encode = Encoding.GetEncoding(name);
50.             if (encode != null)
51.             {
52.                 if (textBox1.TextLength % 2 == 0)
53.                 {
54.                     ArrayList al = new ArrayList();
55.                     for (int i = 0; i < textBox1.TextLength; i += 2)
56.                     {
57.                         Byte b = 0;
58.                         string hex = textBox1.Text.Substring(i, 2);
59.                         if (Byte.TryParse(hex, System.Globalization.NumberStyles.HexNumber, null, out b))
60.                             al.Add(b);
61.                         else
62.                             return;
63.                     }
64.                     textBox1.Text = encode.GetString((Byte[])al.ToArray(typeof(Byte)));
65.                 }
66.             }
67.         }
68.  
69.         private void textBox1_KeyDown(object sender, KeyEventArgs e)
70.         {
71.             if (e.Control && e.KeyCode == Keys.A)
72.                 textBox1.SelectAll();
73.         }
74.  
75.         private void Form1_KeyDown(object sender, KeyEventArgs e)
76.         {
77.             if (e.Control && e.KeyCode == Keys.A)
78.             {
79.                 textBox1.SelectAll();
80.                 textBox1.Focus();
81.             }
82.  
83.             if (e.Control && e.KeyCode == Keys.H)
84.                 button1.PerformClick();
85.  
86.             if (e.Control && e.KeyCode == Keys.S)
87.                 button2.PerformClick();
88.  
89.             if (e.Control && e.KeyCode == Keys.W)
90.                 this.Close();
91.         }
92.  
93.         private void textBox1_TextChanged(object sender, EventArgs e)
94.         {
95.             label2.Text = string.Format("Word Count: {0}", textBox1.TextLength);
96.         }
97.     }
98. }
99.  

msys git single file history

In Git BASH
gitk -- path/to/file &

Or right click on file
Then click "Git History"

BTW...
Not only file, files in folders also do.

net snmp 尋找 mib tree

先看 net snmp
把mib檔設定一下 然後載入mib檔

找名字含有ssl的snmp oid
snmptranslate -TB '.*ssl.*'

從 http://www.net-snmp.org/wiki/index.php/TUT:snmptranslate 看來的...

html encode/decode using javascript

1. String.prototype.encodeHTML = function() { var d=document.createElement("div");(d.textContent)?(d.textContent=this):d.innerText=this;return d.innerHTML };
2. String.prototype.decodeHTML = function() { var d=document.createElement("div");d.innerHTML=this;return d.innerText||d.textContent };

net snmp

net-snmp download

安裝至預設路徑C:\netsnmp


設定 C:\netsnmp\usr\etc\snmp\snmp.conf
document -> C:\netsnmp\usr\docs\Net-SNMP.chm

#放mib的地方
mibdirs C:/netsnmp/usr/share/snmp/mibs-XXXX
persistentDir C:/netsnmp/usr/snmp/persist
tempFilePattern C:/netsnmp/usr/temp/snmpdXXXXXX

#載入所有的mib
mibs all

#預設版本 snmpv2c
defVersion 2c

#預設Community
defCommunity private


然後就可以用cmd來下指令了...

P.S.
記得要加環境變數 ;C:\netsnmp\usr\bin 在PATH後面...


snmp走走...
snmpwalk 192.168.1.1 system

從頭走到尾...
snmpwalk 192.168.1.1 .1

snmp翻譯成樹狀...
snmptranslate -IR -Tp system

Git get diff file list and diff content from some branch

1. BRANCH_NAME='dev'
2. SOURCE_DIR='/home/me/src'
3. EXPORT_TO='/home/me/out'
4.  
5. cd $SOURCE_DIR
6. git diff --name-only $BRANCH_NAME > $EXPORT_TO/changes.txt
7. git diff $BRANCH_NAME > $EXPORT_TO/changes.diff
8.  

Unix like shell - find_keywords

1. #!/bin/sh
2. if [ "xx$2" != "xx" ] && [ -e $2 ]; then
3.     echo finding $1 in $2
4.     if [ "xx$WINDIR" != "xx" ]; then
5.         grep -lr $1 $2 | sed 's~/~\\~g' | sed 's~^\\\(\w\)\\~\U\1:\\~g'
6.     else
7.         grep -lr $1 $2
8.     fi
9. else
10.     echo first param must be search string
11.     echo second param must be full path
12. fi

CodeBlocks 中文化

下載mo檔:
codeblocks translation page
www.badongo.com - Click Here to Download codeblocks zh_TW
www.u-file.net - Click Here to Download codeblocks zh_TW

然後建一個目錄 C:\Program Files\CodeBlocks\share\CodeBlocks\locale\zh_TW
其中 C:\Program Files\CodeBlocks 是安裝路徑
然後把mo檔放到裏面去

Settings -> Environment -> View -> Internationalization
勾起來 -> 選 Chinese
然後重開CodeBlocks

搞定...

BTW...中文化以後, syntex highlight好像消失了...
所以還是把勾勾拿掉好了....sigh.....

Compare a Copy of a Project

Usage:

compare-projects /home/me/project/ /home/me/old/project/ | grep -v OK > /home/me/compare_result 2>&1

Source: compare-projects

1. #!/usr/bin/sh
2.  
3. #
4. # settings
5. #
6.  
7. md5=~/bin/md5files
8.  
9. #
10. # inputs
11. # src: main project
12. # dst: another project
13. #
14.  
15. src=$1
16. dst=$2
17.  
18. #
19. # limit file size smaller than 1024k (pass to find)
20. # md5 all files, and then replace the path to destination
21. # finally compare the md5 "use md5sum -c"
22. #
23.  
24. $md5 $src -size -1024k | sed "s!${src}!${dst}!g" | md5sum -c 2>&1

Get All Files Recursively and Get MD5

1. #!/usr/bin/sh
2.  
3. #
4. # find all files recursively, and enum them to get md5sum
5. # args: pass all to find
6. #
7.  
8. for f in $(find $@ -type f);
9. do
10.     md5sum $f
11. done