Today I began reading on good old wikipedia about the different compilers I could choose from, I found the following options.

1. Ch - compatible on virtually all platforms is open source. Ch also has an Integrated Development Environment for 'improved' workflow.
2. GCC - What I've familiarized myself with and will most likely be using most this semester.
3. Icc - A compiler thats source is open for non-commercial use. Icc has a windows only IDE, which is no help to me…
4. PGCC - Part of visual studio on windows.

Impressions of Freeswitch

From what I've read about FreeSWITCH is that it's relatively new (as of 2006) and is a softswitch communicator that interfaces with both physical and digital phones. It's built on open source technologies like SQLight and Apache. FreeSWITCH accepts an array of protocols such as VOIP, SIP, Google Talk and many more to interface with and supports a wide array of audio codecs.

Here are some of the more important configuration file fore FreeSWITCH:

On our datacom server, FreeSWITCH is located in '/usr/local/freeswitch' and includes the following directories in its base:

[root@dhcp-171 freeswitch]# ls
bin  conf  db  grammar	htdocs	include  lib  log  mod	recordings  run  scripts  sounds  storage
[root@dhcp-171 freeswitch]# 

Bin holds the various executables that are the core of freeswitch, conf holds configuration files that some genius wrote in xml to sort in some ridiculous hierarchical model.

There are other meta items like FreeSWITCH's library and scripts.

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

• What action or concept of significance, as related to the course, did you experience on this date?
• Why was this significant?
• What concepts are you dealing with that may not make perfect sense?
• What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

• What action or concept of significance, as related to the course, did you experience on this date?
• Why was this significant?
• What concepts are you dealing with that may not make perfect sense?
• What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

Can you include the main() of a program in a header file?

http://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

I suspect that you can include any function within a header file and call it. Including main().

Then call it like so:

main();

I'm going to take the main portion of the encipher program from project two and place it into main.h

int main(int argc, char **argv)
{
 
 
	printf("Greetings, Agent Haas.\n");
	FILE *in, *out;
 
	int cipher;
	int key;
 
	in = fopen("plain.txt", "r");
	out = fopen("enciphered.txt", "w");
 
	if(argv[1] == NULL)
 
		{
        		printf("\nNo argument provided, execute with key argument.\nexample: ./encipher 1\n");
        		exit(1);
    		}
 
	char *plain;
	plain = (char*) malloc (sizeof(char) * 127);
	int count = 0;
 
	if(in == NULL)
		{
        		printf("\nFile empty, enter some text to encipher\n");
        		fgets(plain, 127, stdin);
 
        	while(plain[count] != '\0')
        		{
 
        			count = count+1;
        		}
 
        	int cipher = atoi(argv[1]);
        	count = 0;
 
        	while(plain[count] != '\0')
        		{
            			key = 1;
 
            			if(plain[count] >= 65 && plain[count] <= 90)
            				{
                				key = plain[count] + cipher;
 
                					while(key > 90)
                						{
                    							key = key - 26;
                						}
            				}
 
            			if(plain[count] >= 97 && plain[count] <= 122)
            				{
                				key = plain[count] + cipher;
 
	               					while(key > 122)
                						{
                    							key = key - 26;
                						}
            				}
            			if(key == 1)
            				{
                				key = 32;
            				}
 
            			fprintf(out, "%c", key);
            			count = count+1;
        		}
 
        	printf("\nEnciphered text is loated in enciphered.txt\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
	}
 
    else
	{
        	fgets(plain, 127, in);
        	printf("\nText before cipherication: ");
        	while(plain[count] != '\0')
        		{
        			printf("%c", plain[count]);
				count = count+1;
        		}
        	int cipher = atoi(argv[1]);
        	count = 0;
		printf("\nCiphered text output: ");
        	while(plain[count] != '\0')
        		{
            			key = 1;
				if(plain[count] >= 65 && plain[count] <= 90)
        				{
                				key = plain[count] + cipher;
                				while(key > 90)
            						{
                    						key = key - 26;
            						}
         				}
 
               			if(plain[count] >= 97 && plain[count] <= 122)
      	 				{
                				key = plain[count] + cipher;
                				while(key > 122)
                					{
                						key = key - 26;
                					}
         				}
               			if(key == 1)
         				{
                				key = 32;
         				}
				printf("%c", key);
				fprintf(out, "%c", key);
				count = count+1;
	 		}
 
 
		fclose(in);
		fclose(out);
	    return (0);
	}
 
}

Here's main.h:

#ifndef _MAIN_H
#define _MAIN_H
 
 
int main(int argc, char **argv)
{
int t;
  t = clock();
 
	printf("Greetings, Agent Haas.\n");
	FILE *in, *out;
 
	int cipher;
	int key;
 
	in = fopen("plain.txt", "r");
	out = fopen("enciphered.txt", "w");
 
	if(argv[1] == NULL)
 
		{
        		printf("\nNo argument provided, execute with key argument.\nexample: ./encipher 1\n");
        		exit(1);
    		}
 
	char *plain;
	plain = (char*) malloc (sizeof(char) * 127);
	int count = 0;
 
	if(in == NULL)
		{
        		printf("\nFile empty, enter some text to encipher\n");
        		fgets(plain, 127, stdin);
 
        	while(plain[count] != '\0')
        		{
 
        			count = count+1;
        		}
 
        	int cipher = atoi(argv[1]);
        	count = 0;
 
        	while(plain[count] != '\0')
        		{
            			key = 1;
 
            			if(plain[count] >= 65 && plain[count] <= 90)
            				{
                				key = plain[count] + cipher;
 
                					while(key > 90)
                						{
                    							key = key - 26;
                						}
            				}
 
            			if(plain[count] >= 97 && plain[count] <= 122)
            				{
                				key = plain[count] + cipher;
 
	               					while(key > 122)
                						{
                    							key = key - 26;
                						}
            				}
            			if(key == 1)
            				{
                				key = 32;
            				}
 
            			fprintf(out, "%c", key);
            			count = count+1;
        		}
 
        	printf("\nEnciphered text is loated in enciphered.txt\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
	}
 
    else
	{
        	fgets(plain, 127, in);
        	printf("\nText before cipherication: ");
        	while(plain[count] != '\0')
        		{
        			printf("%c", plain[count]);
				count = count+1;
        		}
        	int cipher = atoi(argv[1]);
        	count = 0;
		printf("\nCiphered text output: ");
        	while(plain[count] != '\0')
        		{
            			key = 1;
				if(plain[count] >= 65 && plain[count] <= 90)
        				{
                				key = plain[count] + cipher;
                				while(key > 90)
            						{
                    						key = key - 26;
            						}
         				}
 
               			if(plain[count] >= 97 && plain[count] <= 122)
      	 				{
                				key = plain[count] + cipher;
                				while(key > 122)
                					{
                						key = key - 26;
                					}
         				}
               			if(key == 1)
         				{
                				key = 32;
         				}
				printf("%c", key);
				fprintf(out, "%c", key);
				count = count+1;
	 		}
		printf("\nEnciphered text is located in enciphered.txt\n\n");
printf ("It took me %d clicks (%f seconds).\n",t,((float)t)/CLOCKS_PER_SEC);
 
		fclose(in);
		fclose(out);
	    return (0);
	}
 
}
 
#endif

Here's the modified program:

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include "main.h"
 
main();

And the gcc output:

lab46:~/src/cprog/cipher$ gcc encipher.c -o encipher
encipher.c:20: warning: data definition has no type or storage class
lab46:~/src/cprog/cipher$ 

Got a warning, but it worked.

Based on the data collected:

• My hypothesis was indeed correct.
• My hypothesis halfway applicable, I have to explore the repercussions of the error.

Header files are a brilliant way to break up ANY function in a program to allow more readable code and FAR better organization.

Today we figured out how to call system tasks using nothing but the asterisk extensions.conf file.

To add an extension executes a script you simply need to add “System(pathtoscript.sh)”

In practice this would look like this:

exten => 607,1,Answer
exten => 607,2,Wait(1)
exten => 607,3,System(path/to/script.sh) ;make sure to place in writable path for asterisk user
exten => 607,4,Hangup()

This opens a plethora of new possibilities that we'll explore in the coming weeks!

Today I've decided to start researching the implications of installing PBX and Asterisk on my Raspberry Pi. My ultimate goal would be initiating a house appliance by literally calling it through asterisk. Smart appliances here I come! =D I'm starting my research here:

• http://hackaday.com/2012/08/22/building-a-pbx-setup-around-the-raspberry-pi/
• http://thelamegerman.wordpress.com/2012/04/20/installation-of-freepbx-2-10-on-debian-wheezy-kernel-3-2/
• http://hackaday.com/2011/03/18/free-home-phone-method-uses-parts-were-familiar-with/

UPDATE! FreePBX is loaded and I've setup some extensions. Now I'll be looking into some ip appliances for automation.

Finding direction in Data Com

With everyone moving into their individual projects I'm at as loss with what to do. Hoping we can establish a tangible direction some time soon.

This is a sample format for a dated entry. Please substitute the actual date for “Month Day, Year”, and duplicate the level 4 heading to make additional entries.

As an aid, feel free to use the following questions to help you generate content for your entries:

• What action or concept of significance, as related to the course, did you experience on this date?
• Why was this significant?
• What concepts are you dealing with that may not make perfect sense?
• What challenges are you facing with respect to the course?

Remember that 4 is just the minimum number of entries. Feel free to have more.

Can you include the main() of a program in a header file?

Collect information and resources (such as URLs of web resources), and comment on knowledge obtained that you think will provide useful background information to aid in performing the experiment.

Based on what you've read with respect to your original posed question, what do you think will be the result of your experiment (ie an educated guess based on the facts known). This is done before actually performing the experiment.

State your rationale.

How are you going to test your hypothesis? What is the structure of your experiment?

Perform your experiment, and collect/document the results here.

Based on the data collected:

• Was your hypothesis correct?
• Was your hypothesis not applicable?
• Is there more going on than you originally thought? (shortcomings in hypothesis)
• What shortcomings might there be in your experiment?
• What shortcomings might there be in your data?

What can you ascertain based on the experiment performed and data collected? Document your findings here; make a statement as to any discoveries you've made.

At this point I'm nearly done with bignum, all that is needed is the multiplication function along with some minor tweaking. I hope to complete it before the end of break.

Today I've looked into some extensive research:(http://math.berkeley.edu/~jakub/pdf/kominiarczuk2004.pdf) regarding tin-can phones. In order to receive higher quality connection I propose we build a box apparatus around our speaker and microphone setups. Also, the fishing line will most likely produce the greatest result with identical plastic cups rather than cans due to their membranes ability to vibrate easily. Finally the tension. Section D discuses frequency of waves in relation to tension. Essentially, to tight is just as bad as too loose. (that's what he said.)

I hope we can put this information to use on Tuesday Dec 4.

today for data comm, I've started research on network programming with a a focus in C to be reinvent to my independent study. I plan on spending a better part of this day going over this page: http://shoe.bocks.com/net/

My hope is to build network status LED via the GPIO on my Raspberry Pi

Out with my girlfriend Dana and some friends at Ithaca College. We were paying a game called “Power Hour”(Google is your friend) I decided that instead of keeping track of the time, why not write a simple program to do this for us? I came up with the following:

#include <time.h>
#include <stdio.h>
int main()
{
printf("\a");
for (;;)
        {
        printf("begin minute\n");
        sleep(60);
        printf("BEEP\a\n");
        }
}

Having lots of funnnn

UPDATE: After looking over what I had done last night I realized there was huge room for improvement. Here's the update:

#include <stdio.h>
#include <time.h>
 
int main()
{
        printf("Begin power hour!\n\a");
        int i;
        for(i = 0; i <= 60; ++i)
        {
                printf("Minute Number: %d\n",i);
                sleep(60);
                printf("Drink!\n\a");
        }
        return 0;
}

Can I declare all my datatypes in a struct and alias them in main?

I believe that it will be possible to declare all my datatypes in a simple structure and call them in main.

I've built a simple program that calls three integers and one character array that I will use as a base for my experiment.

#include <stdio.h>
#include <string.h>
 
int main()
{
        int a = 1;
        int b = 2;
        int c = 3;
        char abc[] = "abc";
        printf("Now I know my %s's, they are easy as %d, %d, %d\n", abc, a, b, c);
        return 0;
}

Program modified with struct:

#include <stdio.h>
#include <string.h>
 
typedef struct {
        int a;
        int b;
        int c;
        char abc[];
        }node;
 
int main()
{
        node n;
        n.a = 1;
        n.b = 2;
        n.c = 3;
        strcpy(n.abc, "abc");
        printf("Now I know my %s's, they are easy as %d, %d, %d\n", n.abc, n.a, n.b, n.c);
        return 0;
}

By declaring variables with their assigned datatype in the typedef struct, you can call the variable with an alias to that struct without setting the datatype in that function.

Based on the data collected:

• My hypothesis was correct.
• my hypothesis was applicable.

What can you ascertain based on the experiment performed and data collected? Document your findings here; make a statement as to any discoveries you've made.