getting a line from a file...

[linuxdude]

I want to know how to get a line from a file with read, because I had to use open for the file I have. I am trying though(sorry about all the questions) here is what I have but something isn't working

 while((read(back_file_name,back_buffer,(1*(sizeof(char)))))!='\0'){
        }

[quzah]

Most people just use fgets. The FAQ also covers reading a line using fgets. You could also use fgetc if you want one character at a time.

Quzah.

[linuxdude]

Yeah but that is from a *stream. I used open so it is a file descriptor as an int. you know

int=open("file",O_RDWR);

It isn't a *stream. What do I do?

[quzah]

Just like fgets...

int bytesread = 0;

bytesread = read( filedescriptor, buffertoreadinto, sizetoread );

Always check your return value, and make sure it's what you expect it to be. Then handle the contents of the buffer, and repeat the process.

Quzah.

[linuxdude]

yeah but how do I figure out sizetoread. The size of the line I can't do strenlen(line) because I don't have the line yet??

[WaltP]

Originally posted by linuxdude
yeah but how do I figure out sizetoread. The size of the line I can't do strenlen(line) because I don't have the line yet??

He's trying to say you can't with a file descriptor. You'll have to read a character at a time until you read the EOL character.

Or as suggested, change to file streams.

[linuxdude]

thanx I figured it