Patch to Lenny Tropiano's "sysinfo" program for the Unix PC.

[Augustine Cano]

	Patch for Lenny Tropiano's sysinfo program for the UNIX PC.
		By John Campbell  ...!arizona!naucse!jdc

This patch prevents sysinfo from writing to the 2 bottom lines of the Unix
PC screen if those lines are being used by another program.  This patch
will be useful to users of GNUPLOT 1.10A, which uses those 2 lines for
range information.  It will, of course, work with any other program, such as
the UA, the phone manager, etc... that uses these 2 lines (ie: soft keys.)

*** sysinfo.c.orig	Sun Jun 18 20:25:06 1989
--- sysinfo.c	Mon Jun 19 20:54:19 1989
***************
*** 164,169
  		mailcheck(mailbuffer);
  		loadaverage(loadbuf);
  
  		utd.ut_num = WTXTSLK1;
  		sprintf(utd.ut_text,LINE_1,
  			mailbuffer, loadbuf,

--- 164,170 -----
  		mailcheck(mailbuffer);
  		loadaverage(loadbuf);
  
+ 		if (line_free (wd, WTXTSLK1, 21, "Load")) { 
  			utd.ut_num = WTXTSLK1;
  			sprintf(utd.ut_text,LINE_1,
  				mailbuffer, loadbuf,
***************
*** 172,177
  			mins,(mins == 1) ? " " : "s"
  		);
          	ioctl(wd, WIOCSETTEXT, &utd);
  
  		utd.ut_num = WTXTSLK2;
  		freemem    = memory() / MEGABYTE;

--- 173,179 -----
  				mins,(mins == 1) ? " " : "s"
  			);
         		ioctl(wd, WIOCSETTEXT, &utd);
+ 		}
  
  		if (line_free (wd, WTXTSLK2, 0, "File")) {
  			utd.ut_num = WTXTSLK2;
***************
*** 173,178
  		);
          	ioctl(wd, WIOCSETTEXT, &utd);
  
  		utd.ut_num = WTXTSLK2;
  		freemem    = memory() / MEGABYTE;
  		sprintf(utd.ut_text,LINE_2,

--- 175,181 -----
         		ioctl(wd, WIOCSETTEXT, &utd);
  		}
  
+ 		if (line_free (wd, WTXTSLK2, 0, "File")) {
  			utd.ut_num = WTXTSLK2;
  			freemem    = memory() / MEGABYTE;
  			sprintf(utd.ut_text,LINE_2,
***************
*** 181,186
  			   * 100.0), fs.s_tinode, freemem
  		);
          	ioctl(wd, WIOCSETTEXT, &utd);
  #ifdef CHGWIND
  		close(wd);
  #endif

--- 184,190 -----
  			   		* 100.0), fs.s_tinode, freemem
  			);
          	ioctl(wd, WIOCSETTEXT, &utd);
+ 		}
  #ifdef CHGWIND
  		close(wd);
  #endif
***************
*** 329,331
  	return(ctob(mem));
  }
  

--- 333,360 -----
  	return(ctob(mem));
  }
  
+ 
+ int line_free (wd, line_num, offset, buf)
+ int line_num, offset;
+ char *buf;
+ {
+ 	int i;
+ 	char *ptr;
+ 
+ 	utd.ut_num = line_num;
+ 	ioctl(wd, WIOCGETTEXT, &utd);
+ 
+ /* Count blanks, if 80 then return 1. */
+ 	for (i=0, ptr=utd.ut_text; i < 80; ++i, ++ptr)
+ 		if (*ptr != ' ') break;
+ 	if (i == 80 || *ptr == '\0') return 1;
+ 
+ /* Otherwise see if the string is an expected string... */
+ 	ptr = utd.ut_text + offset;
+ 	while (*buf == *ptr) {
+ 		++buf;
+ 		++ptr;
+ 	}
+ 
+ 	return *buf == '\0';
+ }