Part 1

Entries

Entry 1: August 28, 2012

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

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

Entry 2: September 25, 2012

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.

Entry 3: August Day, 2012

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.

Entry 4: August Day, 2012

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.

Keywords

cprog Keyword 1

Identification of chosen keyword.

Functions

All programs contain at least a main() function. The main()function typically is executed when the program starts. functions contain parameters or instructions to be used during the programs computation. Here is an example of a function parameter:

long sum( int array[], int number ) // Identifiers
 
{                                   //body of function
 
  int i;
 
  long result = 0;       
 
 
 
  for( i = 0;  i < number;  ++i )
 
     result += (long)array[i];
 
  return result;
 
}

Functions can also have declarations before the body where you can call datatypes.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

cprog Keyword 1 Phase 2

Identification of chosen keyword.

Definition

Structs, not your mama's sneaker shoes.

Example

#include <stdio.h>
#include <stdlib.h>
 
struct mystruct {                 //
    int test;                     // Declaration of initial struct.
};                                //
 
typedef struct mystruct * newstruct;                                    // newstruct function is a pointer to my struct.
 
newstruct getnewstruct() {
    newstruct temp = (newstruct)malloc(sizeof(newstruct*)) ;
    return temp;
}
 
int main()
{
    newstruct tester = getnewstruct() ;                  //
    tester -> test = 8;                                  // Mathematical manipulation and printing of structure.
    tester -> test++;                                    //
    printf ("The value is %i\n",tester -> test) ;        //
    free(tester) ;
    return 0;
}

Demonstration

Demonstration of the indicated keyword.

If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:

Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:

andrew ~ $ gcc malloc.c -o malloc
andrew ~ $ ./malloc
First value: 10
Pi is: 3.140000

datacomm Keyword 1

Identification of chosen keyword.

Definition

Definition (in your own words) of the chosen keyword.

References

List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).

Reference 1
Reference 2
Reference 3

datacomm Keyword 1 Phase 2

asterisk

Definition

A programming language to communicate and execute the basic functions of telephony services.

Demonstration

'extensions.conf' located in '/etc/asterisk/extensions.conf' maintains a bulk of the configurations options for the asterisk service including your dial plan and how inbound/outbound calls are routed. Example of an extension:

exten => 602,1,Dial(SIP/Andrew,20)
exten => 602,n,VoiceMail(602@vm,u)

'sip.conf' located in '/etc/asterisk/sip.conf' maintains the users locations and affiliation to the asterisk server. Example of a sip.conf user entry:

[Andrew]
type=friend
secret=123456
host=dynamic
context=users
deny=0.0.0.0/0
permit=10.80.2.0/255.255.255.0
mailbox=778@vm

Experiment 1

Question

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

Resources

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

Hypothesis

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

Then call it like so:

main();

Experiment

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);
	}
 
}

Data

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.

Analysis

Based on the data collected:

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

Conclusions

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

Lab46 Wiki

Table of Contents

Part 1

Entries

Entry 1: August 28, 2012

Entry 2: September 25, 2012

Entry 3: August Day, 2012

Entry 4: August Day, 2012

Keywords

cprog Keyword 1

Functions

References

cprog Keyword 1 Phase 2

Definition

Example

Demonstration

datacomm Keyword 1

Definition

References

datacomm Keyword 1 Phase 2

Definition

Demonstration

Experiment 1

Question

Resources

Hypothesis

Experiment

Data

Analysis

Conclusions