Help in C please.

[Brez_x]

I am current writing a program that will find words in a file and replace those words with other words

eg. find dog replace it with cat.

I can open a file fine with (o_fd=open(av[1], O_RDWR))== -1) if blah blah.

But i was wondering after opening the file, when it reaches the reading state how would i input each of the characters into an array so i could have a while loop to go through the array of characters and if this matches does this does that.

while((n_chars=read(in_fd, buf, BUFFERSIZE))>0)
{	
     if (n_chars!= 0)
          {
          printf("Read'%d' bytes\n", n_chars);
          }
}

I have this code to test if its reading in the file characters.

I have a char a[Arraysize] declared. I just need to know if i can read the file characters into an array and how to do this.

- Brez

[quzah]

What? You are reading them into an array already. What do you think buf is?


Quzah.

[Brez_x]

O sorry thanks for telling me lol.

Yea i see what you mean now.

But once read into buf how do i use it?

Is it the same like rough example

for i=0;i<Arraysize;i++

if buf[i] = A then remove it and replace etc.

Do i use buf like that? the same as i would with normal array stuff?

Thank alot for telling me buf is the array lol my text book has like 1 sentence on what the code done. Since that code was from my text book.

EDIT - THank you haha im so stupid i just tested it and yea now i will try to do the swapping and stuff. Thank alot for putting me in the right direction lol i sat here for 2 days thinking what to do now i have somewhere to go with this.

Thank you.

[WaltP]

Question: Are all your replacements the same size? Like dog => cat is 3 characters. Anything like replacing bird with mongoose? If so you'll have to move each character from your input buffer into another buffer as you look for the words to replace.

[Mindphuck]

Could he not use "s/wordtoreplace/newword" in regex?

[WaltP]

Could he not use "s/wordtoreplace/newword" in regex?

What does that teach him about array or string manipulation?

[Brez_x]

Yea waltp i do have to do something like that

eg. Bird to mongoose

I was thinking of something like this

say Get replaces to Grab
I was thinking of moving everything a array up

eg.

G E T_T H I S
_G E T_T H I S

So when i replace it will be

G R A B_T H I S

I have to go school soon but yea i have a general idea of making strcpy? or something strcpy this array to another array then so on.

Would this be good? having a for loop and then putting all the array up one every time the program finds "bird" or something.

I will try this after school and post my code up when i finish. Anyways thank you for bring that to my attention.