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#include "sig.h"
#include "substdio.h"
#include "strerr.h"
#include "str.h"
#include "byte.h"
#include "readwrite.h"
#include "exit.h"
#include "fmt.h"
#include "select.h"
#define FATAL "recordio: fatal: "
char pid[FMT_ULONG + 10];
char recordbuf[512];
substdio ssrecord = SUBSTDIO_FDBUF(write,2,recordbuf,sizeof recordbuf);
void record(buf,len,direction)
char *buf;
int len; /* 1...256 */
char *direction;
{
int i;
while (len) {
substdio_puts(&ssrecord,pid);
substdio_puts(&ssrecord,direction);
i = byte_chr(buf,len,'\n');
substdio_put(&ssrecord,buf,i);
if (i == len) {
substdio_puts(&ssrecord,"+\n");
substdio_flush(&ssrecord);
return;
}
substdio_puts(&ssrecord," \n");
substdio_flush(&ssrecord);
buf += i + 1;
len -= i + 1;
}
}
int leftstatus = 0;
char leftbuf[256];
int leftlen;
int leftpos;
int rightstatus = 0;
char rightbuf[256];
int rightlen;
int rightpos;
void doit(fdleft,fdright)
int fdleft; /* copy from 0 to fdleft */
int fdright; /* copy from fdright to 1 */
{
fd_set rfds;
fd_set wfds;
int nfds;
int r;
nfds = 2;
if (nfds <= fdleft) nfds = fdleft + 1;
if (nfds <= fdright) nfds = fdright + 1;
/* XXX: will overflow select buf if too many fds are open */
for (;;) {
FD_ZERO(&rfds);
FD_ZERO(&wfds);
if (leftstatus == 0) FD_SET(0,&rfds);
if (leftstatus == 1) FD_SET(fdleft,&wfds);
if (rightstatus == 0) FD_SET(fdright,&rfds);
if (rightstatus == 1) FD_SET(1,&wfds);
if (select(nfds,&rfds,&wfds,(fd_set *) 0,(struct timeval *) 0) == -1)
continue;
if (FD_ISSET(0,&rfds)) {
r = read(0,leftbuf,sizeof leftbuf);
if (r <= 0) {
leftstatus = -1;
close(fdleft);
substdio_puts(&ssrecord,pid);
substdio_puts(&ssrecord," < [EOF]\n");
substdio_flush(&ssrecord);
}
else {
leftstatus = 1; leftpos = 0; leftlen = r;
record(leftbuf,r," < ");
}
}
if (FD_ISSET(fdleft,&wfds)) {
r = write(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) break;
leftpos += r;
if (leftpos == leftlen) leftstatus = 0;
}
if (FD_ISSET(fdright,&rfds)) {
r = read(fdright,rightbuf,sizeof rightbuf);
if (r <= 0) {
substdio_puts(&ssrecord,pid);
substdio_puts(&ssrecord," > [EOF]\n");
substdio_flush(&ssrecord);
break;
}
else {
rightstatus = 1; rightpos = 0; rightlen = r;
record(rightbuf,r," > ");
}
}
if (FD_ISSET(1,&wfds)) {
r = write(1,rightbuf + rightpos,rightlen - rightpos);
if (r == -1) break;
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
}
}
_exit(0);
}
void main(argc,argv)
int argc;
char **argv;
{
int piin[2];
int piout[2];
pid[fmt_ulong(pid,(unsigned long) getpid())] = 0;
if (argc < 2)
strerr_die1x(100,"recordio: usage: recordio program [ arg ... ]");
if (pipe(piin) == -1)
strerr_die2sys(111,FATAL,"unable to create pipe: ");
if (pipe(piout) == -1)
strerr_die2sys(111,FATAL,"unable to create pipe: ");
switch(fork()) {
case -1:
strerr_die2sys(111,FATAL,"unable to fork: ");
case 0:
sig_pipeignore();
close(piin[0]);
close(piout[1]);
doit(piin[1],piout[0]);
}
close(piin[1]);
close(piout[0]);
if (fd_move(0,piin[0]) == -1)
strerr_die2sys(111,FATAL,"unable to move descriptors: ");
if (fd_move(1,piout[1]) == -1)
strerr_die2sys(111,FATAL,"unable to move descriptors: ");
execvp(argv[1],argv + 1);
strerr_die4sys(111,FATAL,"unable to run ",argv[1],": ");
}
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