l-out.c

The pipe "|" char in linux rewrite in C. Another example of managing streams in C.

/*l-out.c simple pipe .c , you can ripper it if you need.
  compile with gcc l-out.c -o l-out
  usage :

  bash-2.05a$ ./ciao "nmap localhost" lupo
  bash-2.05a$ cat lupo

  Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
  Interesting ports on localhost (127.0.0.1):
  (The 1595 ports scanned but not shown below are in state: closed)
  Port       State       Service
  21/tcp     open        ftp                     
  23/tcp     open        telnet                  
  25/tcp     open        smtp                    
  587/tcp    open        submission              
  6000/tcp   open        X11                     
  6699/tcp   open        napster                 
 
  Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
  bash-2.05a$

*/ 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


void usage()
{
 fprintf (stdout,"l-out.c [command] [filelog]\n");
 exit(0);
}


int main( int argc, char** argv )
{
 FILE* f;
 FILE* record;
 char *recordstring;
 char *command;
 
    if (argc<3) usage();
    command=argv[1]; 
    if ( ( record = fopen(argv[2],"wb")) == NULL ) 
	{
      	perror("fopen" );
      	exit (0);
    	}	
    if( ( f = popen( buffer, "r" ) ) == NULL ) 
	{
    	perror( "popen" );
    	return EXIT_FAILURE;
    	}
    while(!feof(f))
    	{
    	recordstring=malloc(sizeof(recordstring));
    	fgets(recordstring,sizeof(recordstring),f);
    	fprintf (record,"%s",recordstring);
    	}
    fclose(record);
    pclose( f );
    return EXIT_SUCCESS;
 }