ref: 2c6cc121339ade33ac5aa4b46356df1cd5469fbe
dir: /sys/src/cmd/postscript/postio/postio.h/
/*
*
* POSTBEGIN, if it's not NULL, is some PostScript code that's sent to the printer
* before any of the input files. It's not terribly important since the same thing
* can be accomplished in other ways, but this approach is convenient. POSTBEGIN
* is initialized so as to disable job timeouts. The string can also be set on the
* command line using the -P option.
*
*/
#define POSTBEGIN "statusdict /waittimeout 0 put\n"
/*
*
* The following help determine where postio is when it's running - either in the
* START, SEND, or DONE states. Primarily controls what's done in getstatus().
* RADIAN occasionally had problems with two way conversations. Anyway this stuff
* can be used to prevent status queries while we're transmitting a job. Enabled
* by the -q option.
*
*/
#define NOTCONNECTED 0
#define START 1
#define SEND 2
#define DONE 3
/*
*
* Previous versions of postio only ran as a single process. That was (and still
* is) convenient, but meant we could only flow control one direction. Data coming
* back from the printer occasionally got lost, but that didn't often hurt (except
* for lost error messages). Anyway I've added code that lets you split the program
* into separate read and write processes, thereby helping to prevent data loss in
* both directions. It should be particularly useful when you're sending a job that
* you expect will be returning useful data over the communications line.
*
* The next three definitions control what's done with data on communications line.
* The READ flag means the line can be read, while the WRITE flag means it can be
* written. When we're running as a single process both flags are set. I tried to
* overlay the separate read/write process code on what was there and working for
* one process. The implementation isn't as good as it could be, but should be
* safe. The single process version still works, and remains the default.
*
*/
#define READ 1
#define WRITE 2
#define READWRITE 3
/*
*
* Messages generated on the printer and returned over the communications line
* look like,
*
* %%[ status: idle; source: serial 25 ]%%
* %%[ status: waiting; source: serial 25 ]%%
* %%[ status: initializing; source: serial 25 ]%%
* %%[ status: busy; source: serial 25 ]%%
* %%[ status: printing; source: serial 25 ]%%
* %%[ status: PrinterError: out of paper; source: serial 25 ]%%
* %%[ status: PrinterError: no paper tray; source: serial 25 ]%%
*
* %%[ PrinterError: out of paper; source: serial 25 ]%%
* %%[ PrinterError: no paper tray; source: serial 25 ]%%
*
* %%[ Error: undefined; OffendingCommand: xxx ]%%
* %%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
*
* although the list isn't meant to be complete.
*
* The following constants are used to classify the recognized printer states.
* readline() reads complete lines from ttyi and stores them in array mesg[].
* getstatus() looks for the "%%[ " and " ]%%" delimiters that bracket printer
* messages and if found it tries to parse the enclosed message. After the lookup
* one of the following numbers is returned as an indication of the existence or
* content of the printer message. The return value is used in start(), send(),
* and done() to figure out what's happening and what can be done next.
*
*/
#define BUSY 0 /* processing data already sent */
#define WAITING 1 /* printer wants more data */
#define PRINTING 2 /* printing a page */
#define IDLE 3 /* ready to start the next job */
#define ENDOFJOB 4 /* readline() builds this up on EOF */
#define PRINTERERROR 5 /* PrinterError - eg. out of paper */
#define ERROR 6 /* some kind of PostScript error */
#define FLUSHING 7 /* throwing out the rest of the job */
#define INITIALIZING 8 /* printer is booting */
#define DISCONNECT 9 /* from Datakit! */
#define UNKNOWN 10 /* in case we missed anything */
#define NOSTATUS 11 /* no response from the printer */
#define WRITEPROCESS 12 /* dummy states for write process */
#define INTERACTIVE 13 /* and interactive mode */
/*
*
* An array of type Status is used, in getstatus(), to figure out the printer's
* current state. Just helps convert strings representing the current state into
* integer codes that other routines use.
*
*/
typedef struct {
char *state; /* printer's current status */
int val; /* value returned by getstatus() */
} Status;
/*
*
* STATUS is used to initialize an array of type Status that translates the ASCII
* strings returned by the printer into appropriate codes that can be used later
* on in the program. getstatus() converts characters to lower case, so if you
* add any entries make them lower case and put them in before the UNKNOWN entry.
* The lookup terminates when we get a match or when an entry with a NULL state
* is found.
*
*/
#define STATUS \
\
{ \
"busy", BUSY, \
"waiting", WAITING, \
"printing", PRINTING, \
"idle", IDLE, \
"endofjob", ENDOFJOB, \
"printererror", PRINTERERROR, \
"error", ERROR, \
"flushing", FLUSHING, \
"initializing", INITIALIZING, \
NULL, UNKNOWN \
}
/*
*
* The baud rate can be set on the command line using the -b option. If you omit
* it BAUDRATE will be used.
*
*/
#define BAUDRATE B9600
/*
*
* An array of type Baud is used, in routine getbaud(), to translate ASCII strings
* into termio values that represent the requested baud rate.
*
*/
typedef struct {
char *rate; /* string identifying the baud rate */
short val; /* and its termio.h value */
} Baud;
/*
*
* BAUDTABLE initializes the array that's used to translate baud rate requests
* into termio values. It needs to end with an entry that has NULL assigned to
* the rate field.
*
*/
#define BAUDTABLE \
\
{ \
"9600", B9600, \
"B9600", B9600, \
"19200", EXTA, \
"19.2", EXTA, \
"B19200", EXTA, \
"EXTA", EXTA, \
"1200", B1200, \
"B1200", B1200, \
"2400", B2400, \
"B2400", B2400, \
"B4800", B4800, \
"4800", B4800, \
"38400", EXTB, \
"38.4", EXTB, \
"B38400", EXTB, \
"EXTB", EXTB, \
NULL, B9600 \
}
/*
*
* A few miscellaneous definitions. BLOCKSIZE is the default size of the buffer
* used for reading the input files (changed with the -B option). MESGSIZE is the
* size of the character array used to store printer status lines - don't make it
* too small!
*
*/
#define BLOCKSIZE 2048
#define MESGSIZE 512
/*
*
* Some of the non-integer valued functions used in postio.c.
*
*/
char *find();
char *malloc();
char *strtok();