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#include "sig.h"
#include "buffer.h"
#include "strerr.h"
#include "byte.h"
#include "readwrite.h"
#include "exit.h"
#include "iopause.h"
#include "pathexec.h"
#define FATAL "fixcrio: fatal: "
char prebuf[256];
int leftstatus = 0;
char leftbuf[512];
int leftlen;
int leftpos;
int leftflagcr = 0;
int rightstatus = 0;
char rightbuf[512];
int rightlen;
int rightpos;
int rightflagcr = 0;
void doit(int fdleft,int fdright)
{
struct taia stamp;
struct taia deadline;
iopause_fd x[4];
int xlen;
iopause_fd *io0;
iopause_fd *ioleft;
iopause_fd *io1;
iopause_fd *ioright;
int r;
int i;
char ch;
for (;;) {
xlen = 0;
io0 = 0;
if (leftstatus == 0) {
io0 = &x[xlen++];
io0->fd = 0;
io0->events = IOPAUSE_READ;
}
ioleft = 0;
if (leftstatus == 1) {
ioleft = &x[xlen++];
ioleft->fd = fdleft;
ioleft->events = IOPAUSE_WRITE;
}
ioright = 0;
if (rightstatus == 0) {
ioright = &x[xlen++];
ioright->fd = fdright;
ioright->events = IOPAUSE_READ;
}
io1 = 0;
if (rightstatus == 1) {
io1 = &x[xlen++];
io1->fd = 1;
io1->events = IOPAUSE_WRITE;
}
taia_now(&stamp);
taia_uint(&deadline,3600);
taia_add(&deadline,&stamp,&deadline);
iopause(x,xlen,&deadline,&stamp);
if (io0 && io0->revents) {
r = read(0,prebuf,sizeof prebuf);
if (r <= 0) {
leftstatus = -1;
close(fdleft);
}
else {
leftstatus = 1;
leftpos = 0;
leftlen = 0;
for (i = 0;i < r;++i) {
ch = prebuf[i];
if (ch == '\n')
if (!leftflagcr)
leftbuf[leftlen++] = '\r';
leftbuf[leftlen++] = ch;
leftflagcr = (ch == '\r');
}
}
}
if (ioleft && ioleft->revents) {
r = write(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) break;
leftpos += r;
if (leftpos == leftlen) leftstatus = 0;
}
if (ioright && ioright->revents) {
r = read(fdright,prebuf,sizeof prebuf);
if (r <= 0) break;
rightstatus = 1;
rightpos = 0;
rightlen = 0;
for (i = 0;i < r;++i) {
ch = prebuf[i];
if (ch == '\n')
if (!rightflagcr)
rightbuf[rightlen++] = '\r';
rightbuf[rightlen++] = ch;
rightflagcr = (ch == '\r');
}
}
if (io1 && io1->revents) {
r = write(1,rightbuf + rightpos,rightlen - rightpos);
if (r == -1) break;
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
}
}
_exit(0);
}
main(int argc,char **argv,char **envp)
{
int piin[2];
int piout[2];
if (argc < 2)
strerr_die1x(100,"fixcrio: usage: fixcrio 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_ignore(sig_pipe);
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: ");
pathexec_run(argv[1],argv + 1,envp);
strerr_die4sys(111,FATAL,"unable to run ",argv[1],": ");
}
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