Programming

Hi,

I am trying to process line by line of a file. But I should not be allocating static allocation for reading the contents of the file. The memory should be dynamically allocated. The confusion here is how do I determine the size of each line, put it into a buffer with the memory allocated with the size of the line?


Is there any optimised way to do this?

Thanks,
Anitha

size of a line means its length right??

Yes, the length of each line.

Suppose I have a file with the lines:
Today is tuesday.
Tomorrow is Wednesday.

I have to find the length of the first line which I can do by character by character reading till I reach a '\n' with a count of the number of characters but then I have to go back to the beginning of the line again to read the contents of the line and put in the buffer which is allocated the number I obtained by the first level of counting.

Why dont you construct a buffer of some size say 1024. Initialize the buffer contents with 0. As you read each character put that character into the buffer. Once the line is done, you have the length as well as the contents. Create your new memory with that length and do a memcpy (destination, source, length) to copy the contents.

this wont work for lines that are greater than size 1024

instead, parse through the line and then do a dynamic allocation and copy the contents, free that.

But throughput will suffer here as memory is allocated and deallocated each time for parsing a line. Instead of a big buffer size like 1KB or 2 KB ask Vino suggested can be safely used.

Maybe this will help?

Any compelling reason to go for a dynamic solution??
A static solution may not be optimized but a dynamic solution would be expensive in terms of mp units.