Read lines from two text files...

[jaredgalen]

I have a program that reads in a 32-digit hex number from the command line:
ie. findkey a3 1f 2e 3c 4e 5a f6 a3 1f 2e 37 d5 66 1a 33 3c

I take this and split it up into two arrays.
The first 8 go into the input[] array.
The next 8 go into the cipherInput[] array as in the code below.
What I need to do is instead of taking it from the command line, I want to read it from two files.
The first 8 will come from one file, the last 8 will come from another file.
I had been passing it from java, but that was a temp hack.
Can someone help me with this.
//current code//

for (i=0;i<8;i++)
  sscanf(argv[i],&quot;%x&quot;,&input[i]); //reading from cmd line

for (i=8;i<16;i++)
  sscanf(argv[i],&quot;%x&quot;,&cipherInput[i-8]);

for (i=0;i<8;i++) 
  data[i]=input[7-i];
                          //putting into the arrays
for (i=0;i<8;i++) 
  cipherData[i]=cipherInput[7-i];

In summary I need to:
Read in from the first file and put that into input[]
Read in from the second file and put that into cipherInput[]
I have to read from the same line number in each file, both files are gauranteed to have the same number of lines.

Each file format is:
a3 1f 2e 3c 4e 5a f6 a3
1f 2e 37 d5 66 1a 33 3c
.
.
.

 

[itsgsd]

There are many ways to do this, the simplest (since you are using sscanf) would probably be to modify your code to read from a stream using fscanf as follows:

FILE *f1,*f2;
f1 = fopen("file1","r");  // open file 1
f2 = fopen("file2","r");  // open file 2

for (i=0;i<8;i++)
  fscanf(f1,&quot;%x&quot;,&input[i]); //reading from file 1

for (i=0;i<8;i++)
  fscanf(f2,&quot;%x&quot;,&cipherInput[i]); // reading from file 2

for (i=0;i<8;i++)
  data[i]=input[7-i];
                          //putting into the arrays
for (i=0;i<8;i++)
  cipherData[i]=cipherInput[7-i];

Of course you'll want to replace "file1" and "file2" with your real file names & make sure that f1 and f2 aren't NULL after the fopen statements.

Hope this helps.