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?

Perhaps reset the position indicator back to the beginning of the file?

fseek( inputfile, 0, SEEK_SET );

^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.