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Chapter 1 Getting Started with C: Diving in
1. C is a language for small, fast programs
2. But what does a complete C program look like?
3. But how do you run the program?
4. Two types of command
5. Here’s the code so far
6. Card counting? In C?
7. There’s more to booleans than equals...
8. What’s the code like now?
9. Pulling the ol’ switcheroo
10. Sometimes once is not enough...
11. Loops often follow the same structure...
12. You use break to break out...
13. Your C Toolbox
Chapter 2 Memory and Pointers: What are you pointing at?
1. C code includes pointers
2. Digging into memory
3. Set sail with pointers
4. Set sail sou’east, Cap’n
5. Try passing a pointer to the variable
6. Using memory pointers
7. How do you pass a string to a function?
8. Array variables are like pointers...
9. What the computer thinks when it runs your code
10. But array variables aren’t quite pointers
11. Why arrays really start at 0
12. Why pointers have types
13. Using pointers for data entry
14. Be careful with scanf()
15. fgets() is an alternative to scanf()
16. Anyone for three-card monte?
17. Oops...there’s a memory problem...
18. String literals can never be updated
19. If you’re going to change a string, make a copy
20. Memory memorizer
21. Your C Toolbox
Chapter 2.5 Strings: String theory
1. Desperately seeking Susan Frank
2. Create an array of arrays
3. Find strings containing the search text
4. Using the strstr() function
5. It’s time for a code review
6. Array of arrays vs. array of pointers
7. Your C Toolbox
Chapter 3 Creating Small Tools: Do one thing and do it well
1. Small tools can solve big problems
2. Here’s how the program should work
3. But you’re not using files...
4. You can use redirection
5. You can redirect the Standard Input with <...
6. ...and redirect the Standard Output with >
7. But there’s a problem with some of the data...
8. Introducing the Standard Error
9. By default, the Standard Error is sent to the display
10. fprintf() prints to a data stream
11. Let’s update the code to use fprintf()
12. Small tools are flexible
13. Don’t change the geo2json tool
14. A different task needs a different tool
15. Connect your input and output with a pipe
16. The bermuda tool
17. But what if you want to output to more than one file?
18. Roll your own data streams
19. There’s more to main()
20. Overheard at the Head First Pizzeria
21. Let the library do the work for you
22. Your C Toolbox
Chapter 4 Using Multiple Source Files: Break it down, build it up
1. Don’t put something big into something small
2. Use casting to put floats into whole numbers
3. Oh no...it’s the out-of-work actors...
4. Let’s see what’s happened to the code
5. Compilers don’t like surprises
6. Split the declaration from the definition
7. Creating your first header file
8. If you have common features...
9. You can split the code into separate files
10. Compilation behind the scenes
11. The shared code needs its own header file
12. It’s not rocket science...or is it?
13. Don’t recompile every file
14. First, compile the source into object files
15. It’s hard to keep track of the files
16. Automate your builds with the make tool
17. How make works
18. Tell make about your code with a makefile
19. Your C Toolbox
20. C Lab 1: Arduino
Chapter 5 Structs, Unions, and Bitfields: Roll your own structures
1. Sometimes you need to hand around a lot of data
2. Cubicle conversation
3. Create your own structured data types with a struct
4. Just give them the fish
5. Read a struct’s fields with the “.” operator
6. Can you put one struct inside another?
7. How do you update a struct?
8. The code is cloning the turtle
9. You need a pointer to the struct
10. (*t).age vs. *t.age
11. Sometimes the same type of thing needs different types of data
12. A union lets you reuse memory space
13. How do you use a union?
14. An enum variable stores a symbol
15. Sometimes you want control at the bit level
16. Bitfields store a custom number of bits
17. Your C Toolbox
Chapter 6 Data Structures and Dynamic Memory: Building bridges
1. Do you need flexible storage?
2. Linked lists are like chains of data
3. Linked lists allow inserts
4. Create a recursive structure
5. Create islands in C...
6. Inserting values into the list
7. Use the heap for dynamic storage
8. Give the memory back when you’re done
9. Ask for memory with malloc()...
10. Oh, no! It’s the out-of-work actors...
11. Let’s fix the code using the strdup() function
12. Free the memory when you’re done
13. Exhibit A: the source code
14. An overview of the SPIES system
15. Software forensics: using valgrind
16. Use valgrind repeatedly to gather more evidence
17. Look at the evidence
18. The fix on trial
19. Your C Toolbox
Chapter 7 Advanced Functions: Turn your functions up to 11
1. Looking for Mr. Right...
2. Pass code to a function
3. You need to tell find() the name of a function
4. Every function name is a pointer to the function...
5. ...but there’s no function data type
6. How to create function pointers
7. Get it sorted with the C Standard Library
8. Use function pointers to set the order
9. Automating the Dear John letters
10. Create an array of function pointers
11. Make your functions streeeeeetchy
12. Your C Toolbox
Chapter 8 Static and Dynamic Libraries: Hot-swappable code
1. Code you can take to the bank
2. Angle brackets are for standard headers
3. But what if you want to share code?
4. Sharing .h header files
5. Share .o object files by using the full pathname
6. An archive contains .o files
7. Create an archive with the ar command...
8. Finally, compile your other programs
9. The Head First Gym is going global
10. Calculating calories
11. But things are a bit more complex...
12. Programs are made out of lots of pieces...
13. Dynamic linking happens at runtime
14. Can you link .a at runtime?
15. First, create an object file
16. What you call your dynamic library depends on your platform
17. Your C Toolbox
18. C Lab 2: OpenCV
Chapter 9 Processes and System Calls: Breaking boundaries
1. System calls are your hotline to the OS
2. Then someone busted into the system...
3. Security’s not the only problem
4. The exec() functions give you more control
5. There are many exec() functions
6. The array functions: execv(), execvp(), execve()
7. Passing environment variables
8. Most system calls go wrong in the same way
9. Read the news with RSS
10. exec() is the end of the line for your program
11. Running a child process with fork() + exec()
12. Your C Toolbox
Chapter 10 Interprocess Communication: It’s good to talk
1. Redirecting input and output
2. A look inside a typical process
3. Redirection just replaces data streams
4. fileno() tells you the descriptor
5. Sometimes you need to wait...
6. Stay in touch with your child
7. Connect your processes with pipes
8. Case study: opening stories in a browser
9. In the child
10. In the parent
11. Opening a web page in a browser
12. The death of a process
13. Catching signals and running your own code
14. sigactions are registered with sigaction()
15. Rewriting the code to use a signal handler
16. Use kill to send signals
17. Sending your code a wake-up call
18. Your C Toolbox
Chapter 11 Sockets and Networking: There’s no place like 127.0.0.1
1. The Internet knock-knock server
2. Knock-knock server overview
3. BLAB: how servers talk to the Internet
4. A socket’s not your typical data stream
5. Sometimes the server doesn’t start properly
6. Why your mom always told you to check for errors
7. Reading from the client
8. The server can only talk to one person at a time
9. You can fork() a process for each client
10. Writing a web client
11. Clients are in charge
12. Create a socket for an IP address
13. getaddrinfo() gets addresses for domains
14. Your C Toolbox
Chapter 12 Threads: It’s a parallel world
1. Tasks are sequential...or not...
2. ...and processes are not always the answer
3. Simple processes do one thing at a time
4. Employ extra staff: use threads
5. How do you create threads?
6. Create threads with pthread_create
7. The code is not thread-safe
8. You need to add traffic signals
9. Use a mutex as a traffic signal
10. Your C Toolbox
11. C Lab 3: Blasteroids

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Appendix Leftovers: The top ten things (we didn’t cover)
1. #1. Operators
2. #2. Preprocessor directives
3. #3. The static keyword
4. #4. How big stuff is
5. #5. Automated testing
6. #6. More on gcc
7. #7. More on make
8. #8. Development tools
9. #9. Creating GUIs
10. #10. Reference material
Appendix C Topics: Revision roundup
1. Basics
2. Pointers and memory
3. Strings
4. Data streams
5. Data types
6. Multiple files
7. Structs
8. Unions and bitfields
9. Data structures
10. Dynamic memory
11. Advanced functions
12. Static and dynamic libraries
13. Processes and communication
14. Sockets and networking
15. Threads

Chapter 1 Getting Started with C: Diving in

C is a language for small, fast programs

But what does a complete C program look like?

But how do you run the program?

Two types of command

Here’s the code so far

Card counting? In C?

There’s more to booleans than equals...

What’s the code like now?

Pulling the ol’ switcheroo

Sometimes once is not enough...

Loops often follow the same structure...

You use break to break out...

Your C Toolbox

Chapter 2 Memory and Pointers: What are you pointing at?

C code includes pointers

Digging into memory

Set sail with pointers

Set sail sou’east, Cap’n

Try passing a pointer to the variable

Using memory pointers

How do you pass a string to a function?

Array variables are like pointers...

What the computer thinks when it runs your code

But array variables aren’t quite pointers

Why arrays really start at 0

Why pointers have types

Using pointers for data entry

Be careful with scanf()

fgets() is an alternative to scanf()

Anyone for three-card monte?

Oops...there’s a memory problem...

String literals can never be updated

If you’re going to change a string, make a copy

Memory memorizer

Your C Toolbox

Chapter 2.5 Strings: String theory

Desperately seeking Susan Frank

Create an array of arrays

Find strings containing the search text

Using the strstr() function

It’s time for a code review

Array of arrays vs. array of pointers

Your C Toolbox

Chapter 3 Creating Small Tools: Do one thing and do it well

Small tools can solve big problems

Here’s how the program should work

But you’re not using files...

You can use redirection

You can redirect the Standard Input with <...

...and redirect the Standard Output with >

But there’s a problem with some of the data...

Introducing the Standard Error

By default, the Standard Error is sent to the display

fprintf() prints to a data stream

Let’s update the code to use fprintf()

Small tools are flexible

Don’t change the geo2json tool

A different task needs a different tool

Connect your input and output with a pipe

The bermuda tool

But what if you want to output to more than one file?

Roll your own data streams

There’s more to main()

Overheard at the Head First Pizzeria

Let the library do the work for you

Your C Toolbox

Chapter 4 Using Multiple Source Files: Break it down, build it up

Don’t put something big into something small

Use casting to put floats into whole numbers

Oh no...it’s the out-of-work actors...

Let’s see what’s happened to the code

Compilers don’t like surprises

Split the declaration from the definition

Creating your first header file

If you have common features...

You can split the code into separate files

Compilation behind the scenes

The shared code needs its own header file

It’s not rocket science...or is it?

(t).age vs. t.age