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#ifndef lint |
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static const char RCSid[] = "$Id: devcomm.c,v 2.7 2003/02/25 02:47:22 greg Exp $"; |
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#endif |
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/* |
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* devcomm.c - communication routines for separate drivers. |
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* |
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* External symbols declared in driver.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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|
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#include "color.h" |
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|
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#include "driver.h" |
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|
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#include "vfork.h" |
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|
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#ifndef DEVPATH |
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#define DEVPATH getenv("PATH") /* device search path */ |
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#endif |
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|
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static int comm_getcur(); |
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static void comm_close(), comm_clear(), comm_paintr(), |
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comm_comin(), comm_comout(), comm_flush(); |
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|
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struct driver comm_driver = { |
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comm_close, comm_clear, comm_paintr, comm_getcur, |
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comm_comout, comm_comin, comm_flush |
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}; |
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|
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static void mygets(), myputs(), reply_error(), getstate(); |
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|
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FILE *devin, *devout; |
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|
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int devchild; |
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|
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|
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static struct driver * |
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final_connect() /* verify and initialize connection */ |
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{ |
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putw(COM_SENDM, devout); |
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fflush(devout); |
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if (getw(devin) != COM_RECVM) |
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return(NULL); |
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/* get driver parameters */ |
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getstate(); |
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/* set error vectors */ |
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erract[COMMAND].pf = comm_comout; |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = comm_comout; |
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return(&comm_driver); |
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} |
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|
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|
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struct driver * |
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slave_init(dname, id) /* run rview in slave mode */ |
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char *dname, *id; |
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{ |
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devchild = -1; /* we're the slave here */ |
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devout = stdout; /* use standard input */ |
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devin = stdin; /* and standard output */ |
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return(final_connect()); /* verify initialization */ |
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} |
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|
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|
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struct driver * |
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comm_init(dname, id) /* set up and execute driver */ |
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char *dname, *id; |
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{ |
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char *dvcname; |
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int p1[2], p2[2]; |
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char pin[16], pout[16]; |
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/* find driver program */ |
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if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
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eputs(dname); |
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eputs(": not found\n"); |
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return(NULL); |
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} |
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#ifdef RHAS_FORK_EXEC |
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/* open communication pipes */ |
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if (pipe(p1) == -1 || pipe(p2) == -1) |
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goto syserr; |
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if ((devchild = vfork()) == 0) { /* fork driver process */ |
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close(p1[1]); |
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close(p2[0]); |
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sprintf(pin, "%d", p1[0]); |
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sprintf(pout, "%d", p2[1]); |
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execl(dvcname, dname, pin, pout, id, 0); |
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perror(dvcname); |
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_exit(127); |
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} |
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if (devchild == -1) |
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goto syserr; |
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close(p1[0]); |
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close(p2[1]); |
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if ((devout = fdopen(p1[1], "w")) == NULL) |
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goto syserr; |
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if ((devin = fdopen(p2[0], "r")) == NULL) |
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goto syserr; |
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return(final_connect()); /* verify initialization */ |
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syserr: |
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perror(dname); |
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return(NULL); |
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|
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#else /* ! RHAS_FORK_EXEC */ |
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|
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eputs(dname); |
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eputs(": no fork/exec\n"); |
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return(NULL); |
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|
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#endif /* ! RHAS_FORK_EXEC */ |
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} |
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|
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|
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static void |
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comm_close() /* done with driver */ |
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{ |
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int pid; |
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|
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erract[COMMAND].pf = NULL; /* reset error vectors */ |
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if (erract[WARNING].pf != NULL) |
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erract[WARNING].pf = wputs; |
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fclose(devout); |
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fclose(devin); |
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if (devchild < 0) |
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return; |
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while ((pid = wait(0)) != -1 && pid != devchild) |
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; |
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} |
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|
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|
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static void |
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comm_clear(xres, yres) /* clear screen */ |
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int xres, yres; |
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{ |
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putc(COM_CLEAR, devout); |
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putw(xres, devout); |
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putw(yres, devout); |
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fflush(devout); |
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} |
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|
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|
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static void |
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comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */ |
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COLOR col; |
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int xmin, ymin, xmax, ymax; |
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{ |
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putc(COM_PAINTR, devout); |
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fwrite((char *)col, sizeof(COLOR), 1, devout); |
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putw(xmin, devout); |
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putw(ymin, devout); |
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putw(xmax, devout); |
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putw(ymax, devout); |
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} |
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|
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|
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static void |
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comm_flush() /* flush output to driver */ |
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{ |
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putc(COM_FLUSH, devout); |
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fflush(devout); |
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if (getc(devin) != COM_FLUSH) |
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reply_error("flush"); |
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getstate(); |
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} |
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|
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|
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static int |
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comm_getcur(xp, yp) /* get and return cursor position */ |
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int *xp, *yp; |
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{ |
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int c; |
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|
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putc(COM_GETCUR, devout); |
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fflush(devout); |
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if (getc(devin) != COM_GETCUR) |
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reply_error("getcur"); |
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c = getc(devin); |
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*xp = getw(devin); |
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*yp = getw(devin); |
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return(c); |
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} |
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|
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|
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static void |
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comm_comout(str) /* print string to command line */ |
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char *str; |
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{ |
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putc(COM_COMOUT, devout); |
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myputs(str, devout); |
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if (str[strlen(str)-1] == '\n') |
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fflush(devout); |
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} |
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|
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|
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static void |
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comm_comin(buf, prompt) /* read string from command line */ |
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char *buf; |
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char *prompt; |
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{ |
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putc(COM_COMIN, devout); |
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if (prompt == NULL) |
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putc(0, devout); |
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else { |
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putc(1, devout); |
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myputs(prompt, devout); |
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} |
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fflush(devout); |
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if (getc(devin) != COM_COMIN) |
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reply_error("comin"); |
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mygets(buf, devin); |
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getstate(); |
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} |
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|
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|
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static void |
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mygets(s, fp) /* get string from file (with nul) */ |
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register char *s; |
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register FILE *fp; |
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{ |
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register int c; |
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|
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while ((c = getc(fp)) != EOF) |
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if ((*s++ = c) == '\0') |
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return; |
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*s = '\0'; |
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} |
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|
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|
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static void |
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myputs(s, fp) /* put string to file (with nul) */ |
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register char *s; |
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register FILE *fp; |
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{ |
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do |
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putc(*s, fp); |
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while (*s++); |
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} |
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|
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|
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static void |
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reply_error(routine) /* what should we do here? */ |
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char *routine; |
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{ |
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eputs(routine); |
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eputs(": driver reply error\n"); |
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quit(1); |
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} |
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|
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|
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static void |
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getstate() /* get driver state variables */ |
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{ |
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fread((char *)&comm_driver.pixaspect, |
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sizeof(comm_driver.pixaspect), 1, devin); |
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comm_driver.xsiz = getw(devin); |
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comm_driver.ysiz = getw(devin); |
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comm_driver.inpready = getw(devin); |
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} |
