ref: b0377e84cf31c48afed765c433abe7eebb4135a5
dir: /sys/src/cmd/postscript/tcpostio/tcpostio.c/
#include <stdio.h>
#include <stdlib.h>
#ifdef plan9
#include <bsd.h>
#endif
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
extern int dial_debug;
extern int dial(char*, char*, char*, int*);
/* debug = 0 for no debugging */
/* debug = 1 for readprinter debugging */
/* debug = 2 for sendprinter debugging */
/* debug = 3 for full debugging, its hard to read the messages */
int debug = 0;
#define READTIMEOUT 300
#define RCVSELTIMEOUT 30
#define SNDSELTIMEOUT 300
void
rdtmout(void) {
fprintf(stderr, "read timeout occurred, check printer\n");
}
int
getline(int fd, char *buf, int len) {
char *bp, c;
int i = 0, n;
bp = buf;
while (alarm(READTIMEOUT),(n=read(fd, bp, 1)) == 1) {
alarm(0);
if (*bp == '\r') continue;
i += n;
c = *bp++;
if (c == '\n' || c == '\004' || i >= len-1)
break;
}
alarm(0);
if (n < 0)
return(n);
*bp = '\0';
return(i);
}
typedef struct {
char *state; /* printer's current status */
int val; /* value returned by getstatus() */
} Status;
/* printer states */
#define INITIALIZING 0
#define IDLE 1
#define BUSY 2
#define WAITING 3
#define PRINTING 4
#define PRINTERERROR 5
#define ERROR 6
#define FLUSHING 7
#define UNKNOWN 8
/* protocol requests and program states */
#define START 'S'
unsigned char Start[] = { START };
#define ID_LE 'L'
unsigned char Id_le[] = { ID_LE };
#define REQ_STAT 'T'
unsigned char Req_stat[] = { REQ_STAT };
#define SEND_DATA 'D'
unsigned char Send_data[] = { SEND_DATA };
#define SENT_DATA 'A'
unsigned char Sent_data[] = { SENT_DATA };
#define WAIT_FOR_EOJ 'W'
unsigned char Wait_for_eoj[] = { WAIT_FOR_EOJ };
#define END_OF_JOB 'E'
unsigned char End_of_job[] = { END_OF_JOB };
#define FATAL_ERROR 'F'
unsigned char Fatal_error[] = { FATAL_ERROR };
#define WAIT_FOR_IDLE 'I'
unsigned char Wait_for_idle[] = { WAIT_FOR_IDLE };
#define OVER_AND_OUT 'O'
unsigned char Over_and_out[] = { OVER_AND_OUT };
Status statuslist[] = {
"initializing", INITIALIZING,
"idle", IDLE,
"busy", BUSY,
"waiting", WAITING,
"printing", PRINTING,
"printererror", PRINTERERROR,
"Error", ERROR,
"flushing", FLUSHING,
NULL, UNKNOWN
};
/* find returns a pointer to the location of string str2 in string str1,
* if it exists. Otherwise, it points to the end of str1.
*/
char *
find(char *str1, char *str2) {
char *s1, *s2;
for (; *str1!='\0'; str1++) {
for (s1=str1,s2=str2; *s2!='\0'&&*s1==*s2; s1++,s2++) ;
if ( *s2 == '\0' )
break;
}
return(str1);
}
#define MESGSIZE 16384
int blocksize = 1920; /* 19200/10, with 1 sec delay between transfers
* this keeps the queues from building up.
*/
char mesg[MESGSIZE]; /* exactly what came back on ttyi */
int
parsmesg(char *buf) {
static char sbuf[MESGSIZE];
char *s; /* start of printer messsage in mesg[] */
char *e; /* end of printer message in mesg[] */
char *key, *val; /* keyword/value strings in sbuf[] */
char *p; /* for converting to lower case etc. */
int i; /* where *key was found in statuslist[] */
if (*(s=find(buf, "%[ "))!='\0' && *(e=find(s, " ]%"))!='\0') {
strcpy(sbuf, s+3); /* don't change mesg[] */
sbuf[e-(s+3)] = '\0'; /* ignore the trailing " ]%" */
for (key=strtok(sbuf, " :"); key != NULL; key=strtok(NULL, " :")) {
if (strcmp(key, "Error") == 0)
return(ERROR);
if ((val=strtok(NULL, ";")) != NULL && strcmp(key, "status") == 0)
key = val;
for (; *key == ' '; key++) ; /* skip any leading spaces */
for (p = key; *p; p++) /* convert to lower case */
if (*p == ':') {
*p = '\0';
break;
} else if (isupper(*p)) *p = tolower(*p);
for (i=0; statuslist[i].state != NULL; i++) {
if (strcmp(statuslist[i].state, key) == 0)
return(statuslist[i].val);
}
}
}
return(UNKNOWN);
}
char buf[MESGSIZE];
fd_set readfds, writefds, exceptfds;
struct timeval rcvtimeout = { RCVSELTIMEOUT, 0 };
struct timeval sndtimeout = { SNDSELTIMEOUT, 0 };
int
readprinter(int printerfd, int pipefd)
{
unsigned char proto;
int progstate = START;
int print_wait_msg = 0;
int tocount = 0;
int c, printstat, lastprintstat, n, nfds;
nfds = ((pipefd>printerfd)?pipefd:printerfd) + 1;
printstat = 0;
signal(SIGALRM, rdtmout);
do {
reselect:
/* ask sending process to request printer status */
if (write(pipefd, Req_stat, 1) != 1) {
fprintf(stderr, "request status failed\n");
progstate = FATAL_ERROR;
continue;
}
FD_ZERO(&readfds); /* lets be anal */
FD_SET(printerfd, &readfds);
FD_SET(pipefd, &readfds);
FD_ZERO(&exceptfds);
FD_SET(printerfd, &exceptfds);
FD_SET(pipefd, &exceptfds);
n = select(nfds, &readfds, (fd_set *)0, &exceptfds, &rcvtimeout);
if (debug&0x1) fprintf(stderr, "readprinter select returned %d\n", n);
if (n == 0) {
/* a timeout occurred */
if (++tocount > 4) {
fprintf(stderr, "printer appears to be offline.\nHP4m printers may be out of paper.\n");
tocount = 0;
}
goto reselect;
}
if (n > 0 && FD_ISSET(printerfd, &exceptfds)) {
/* printer problem */
fprintf(stderr, "printer exception\n");
if (write(pipefd, Fatal_error, 1) != 1) {
fprintf(stderr, "'fatal error' write to pipe failed\n");
}
progstate = FATAL_ERROR;
continue;
}
if (n > 0 && FD_ISSET(pipefd, &exceptfds)) {
/* pipe problem */
fprintf(stderr, "pipe exception\n");
progstate = FATAL_ERROR;
continue;
}
if (n > 0 && FD_ISSET(pipefd, &readfds)) {
/* protocol pipe wants to be read */
if (debug&0x1) fprintf(stderr, "pipe wants to be read\n");
if (read(pipefd, &proto, 1) != 1) {
fprintf(stderr, "read protocol pipe failed\n");
progstate = FATAL_ERROR;
continue;
}
if (debug&0x1) fprintf(stderr, "readprinter: proto=%c\n", proto);
/* change state? */
switch (proto) {
case SENT_DATA:
break;
case WAIT_FOR_EOJ:
if (!print_wait_msg) {
print_wait_msg = 1;
fprintf(stderr, "waiting for end of job\n");
}
progstate = proto;
break;
default:
fprintf(stderr, "received unknown protocol request <%c> from sendfile\n", proto);
break;
}
n--;
}
if (n > 0 && FD_ISSET(printerfd, &readfds)) {
/* printer wants to be read */
if (debug&0x1) fprintf(stderr, "printer wants to be read\n");
if ((c=getline(printerfd, buf, MESGSIZE)) < 0) {
fprintf(stderr, "read printer failed\n");
progstate = FATAL_ERROR;
continue;
}
if (debug&0x1) fprintf(stderr, "%s\n", buf);
if (c==1 && *buf == '\004') {
if (progstate == WAIT_FOR_EOJ) {
if (debug&0x1) fprintf(stderr, "progstate=%c, ", progstate);
fprintf(stderr, "%%[ status: endofjob ]%%\n");
/* progstate = WAIT_FOR_IDLE; */
progstate = OVER_AND_OUT;
if (write(pipefd, Over_and_out, 1) != 1) {
fprintf(stderr, "'fatal error' write to pipe failed\n");
}
continue;
} else {
if (printstat == ERROR) {
progstate = FATAL_ERROR;
continue;
}
if (progstate != START && progstate != WAIT_FOR_IDLE)
fprintf(stderr, "warning: EOF received; program status is '%c'\n", progstate);
}
continue;
}
/* figure out if it was a status line */
lastprintstat = printstat;
printstat = parsmesg(buf);
if (printstat == UNKNOWN || printstat == ERROR
|| lastprintstat != printstat) {
/* print whatever it is that was read */
fprintf(stderr, buf);
fflush(stderr);
if (printstat == UNKNOWN) {
printstat = lastprintstat;
continue;
}
}
switch (printstat) {
case UNKNOWN:
continue; /* shouldn't get here */
case FLUSHING:
case ERROR:
progstate = FATAL_ERROR;
/* ask sending process to die */
if (write(pipefd, Fatal_error, 1) != 1) {
fprintf(stderr, "Fatal_error mesg write to pipe failed\n");
}
continue;
case INITIALIZING:
case PRINTERERROR:
sleep(1);
break;
case IDLE:
if (progstate == WAIT_FOR_IDLE) {
progstate = OVER_AND_OUT;
if (write(pipefd, Over_and_out, 1) != 1) {
fprintf(stderr, "'fatal error' write to pipe failed\n");
}
continue;
}
progstate = SEND_DATA;
goto dowait;
case BUSY:
case WAITING:
default:
sleep(1);
dowait:
switch (progstate) {
case WAIT_FOR_IDLE:
case WAIT_FOR_EOJ:
case START:
sleep(5);
break;
case SEND_DATA:
if (write(pipefd, Send_data, 1) != 1) {
fprintf(stderr, "send data write to pipe failed\n");
progstate = FATAL_ERROR;
continue;
}
break;
default:
fprintf(stderr, "unexpected program state %c\n", progstate);
exit(1);
}
break;
}
n--;
}
if (n > 0) {
fprintf(stderr, "more fds selected than requested!\n");
exit(1);
};
} while ((progstate != FATAL_ERROR) && (progstate != OVER_AND_OUT));
if (progstate == FATAL_ERROR)
return(1);
else
return(0);
}
int
sendfile(int infd, int printerfd, int pipefd)
{
unsigned char proto;
int progstate = START;
int i, n, nfds;
int bytesread, bytesent = 0;
nfds = ((pipefd>printerfd)?pipefd:printerfd) + 1;
if (write(printerfd, "\004", 1)!=1) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
}
do {
FD_ZERO(&readfds); /* lets be anal */
FD_SET(pipefd, &readfds);
n = select(nfds, &readfds, (fd_set *)0, (fd_set *)0, &sndtimeout);
if (debug&02) fprintf(stderr, "sendfile select returned %d\n", n);
if (n > 0 && FD_ISSET(pipefd, &readfds)) {
/* protocol pipe wants to be read */
if (read(pipefd, &proto, 1) != 1) {
fprintf(stderr, "read protocol pipe failed\n");
return(1);
}
/* change state? */
if (debug&02) fprintf(stderr, "sendfile command - <%c>\n", proto);
switch (proto) {
case OVER_AND_OUT:
case END_OF_JOB:
progstate = proto;
break;
case SEND_DATA:
bytesread = 0;
do {
i = read(infd, &buf[bytesread], blocksize-bytesread);
if (debug&02) fprintf(stderr, "read %d bytes\n", i);
if (i > 0)
bytesread += i;
} while((i > 0) && (bytesread < blocksize));
if (i < 0) {
fprintf(stderr, "input file read error\n");
progstate = FATAL_ERROR;
break; /* from switch */
}
if (bytesread > 0) {
if (debug&02) fprintf(stderr, "writing %d bytes\n", bytesread);
if (write(printerfd, buf, bytesread)!=bytesread) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
} else if (write(pipefd, Sent_data, 1)!=1) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
} else {
bytesent += bytesread;
}
fprintf(stderr, "%d sent\n", bytesent);
fflush(stderr);
/* we have reached the end of the input file */
}
if (i == 0) {
if (progstate != WAIT_FOR_EOJ) {
if (write(printerfd, "\004", 1)!=1) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
} else if (write(pipefd, Wait_for_eoj, 1)!=1) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
} else {
progstate = WAIT_FOR_EOJ;
}
}
}
break;
case REQ_STAT:
if (write(printerfd, "\024", 1)!=1) {
fprintf(stderr, "write to printer failed\n");
progstate = FATAL_ERROR;
}
if (debug&02) fprintf(stderr, "^T");
break;
case FATAL_ERROR:
progstate = FATAL_ERROR;
}
} else if (n < 0) {
perror("sendfile:select:");
progstate = FATAL_ERROR;
} else if (n == 0) {
sleep(1);
fprintf(stderr, "sendfile timeout\n");
progstate = FATAL_ERROR;
}
} while ((progstate != FATAL_ERROR) && (progstate != OVER_AND_OUT));
if (write(printerfd, "\004", 1)!=1) {
perror("sendfile:write:");
progstate = FATAL_ERROR;
}
if (debug&02) fprintf(stderr, "%d bytes sent\n", bytesent);
if (progstate == FATAL_ERROR)
return(1);
else
return(0);
}
void main(int argc, char *argv[]) {
int c, usgflg=0, infd, printerfd;
int cpid;
int pipefd[2];
char *dialstr;
unsigned long rprv, sprv;
dialstr = 0;
while ((c = getopt(argc, argv, "b:d:")) != -1)
switch (c) {
case 'b':
blocksize = atoi(optarg)/10;
if (blocksize > MESGSIZE || blocksize < 1)
blocksize = MESGSIZE;
break;
case 'd':
debug = atoi(optarg);
dial_debug = debug;
break;
case '?':
fprintf(stderr, "unknown option %c\n", c);
usgflg++;
}
if (optind < argc)
dialstr = argv[optind++];
else {
usgflg++;
}
if (usgflg) {
fprintf(stderr, "usage: %s [-b baudrate] net!host!service [infile]\n", argv[0]);
exit (2);
}
if (optind < argc) {
infd = open(argv[optind], 0);
if (infd < 0) {
fprintf(stderr, "cannot open %s\n", argv[optind]);
exit(1);
}
optind++;
} else
infd = 0;
if (debug & 02) fprintf(stderr, "blocksize=%d\n", blocksize);
if (debug) fprintf(stderr, "dialing address=%s\n", dialstr);
printerfd = dial(dialstr, 0, 0, 0);
if (printerfd < 0) exit(1);
fprintf(stderr, "printer startup\n");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipefd) < 0) {
perror("socketpair");
exit(1);
}
switch(cpid = fork()){
case -1:
perror("fork error");
exit(1);
case 0:
close(pipefd[1]);
sprv = sendfile(infd, printerfd, pipefd[0]); /* child - to printer */
if (debug) fprintf(stderr, "to remote - exiting\n");
exit(sprv);
default:
close(pipefd[0]);
rprv = readprinter(printerfd, pipefd[1]); /* parent - from printer */
if (debug) fprintf(stderr, "from remote - exiting\n");
while(wait(&sprv) != cpid);
exit(rprv|sprv);
}
}