Thread: getting a string from console and put it in a file

Code:

int main(){
	FILE *inputfile,*outputfile;
	char temp[1000];
	
	fgets(temp,1000,stdin); //get one-liner string from console and store it to temp
	inputfile=tmpfile(); //open a temporary file
	fputs(temp,inputfile); //copy the string in temp to fp
	fflush(inputfile); //flush to solve stream buffering
	outputfile=fopen("output.txt", "wt");
	
	yyin=input;
	yyout=output;
	yylex();
	floseall;
}

Actually, I'm working with LEX right now. I posted above the C language part of my program. Just don't bother with the yyin, yyout and yylex(), they're part of the LEX. So here is my problem:

I need to get a one-liner stdin input (meaning, the input will already be entered once you press enter). Then I need to copy that input to a file. Then that file is what I need for yyin, the input to yylex().

Here's how I approached the problem:


fgets(temp,1000,stdin);
First, I used fgets(). During some "experiments" i had done earlier, I confirmed that it was able to get all those inputed including the newline character.

inputfile=tmpfile();
Then I used tmpfile() to open a temporary file (well, we are not allowed to create a file on the physical space)

fputs(temp,input);
Then I used fputs. It seems this is where the problem started. For some reason, I can't have the inputfile contain what I inputed in the console. Otherwise, then yylex() would have been able to process the yyin.

I even used fflush. I've experimented with it a while ago, and the fflush there is working fine. It is not returning any error values.

Yeah this is LEX. But I'm only asking about the C language part. I'm just trying to have inputfile contain the string inputed in the console. Also, the inputfile should not create any file in the physical space. Anybody?

^Thanks very much. That worked. This forum is really awesome. It's my first time using fseek so I don't know it. Thanks again.