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kbmap, kbremap: open kbmap file with OTRUNC and bugfixes

Now that kbdfs supports reseting the map to
the default itself we no longer need to
manually load the ascii maps.

This also fixes a 'bug in the making' in
the buffer read logic that would cause it
to cut lines in half when writing to the
kbmap file. All of our kbmaps are under
8k so this never showed up.

Also fix a small bug in kbremap where it
was not writing out the last null when writing out
kbd events.

--- a/sys/man/1/kbmap

+++ b/sys/man/1/kbmap

@@ -74,6 +74,3 @@

 .B /sys/src/cmd/kbremap.c

 .SH "SEE ALSO"

 .IR kbdfs (8)

-.SH BUGS

-Not all keyboards map the entire set of characters, so one has to

-switch back to the default map before changing to another.

--- a/sys/src/cmd/kbmap.c

+++ b/sys/src/cmd/kbmap.c

@@ -140,21 +140,39 @@

 {

 	int i, fd, ofd;

 	char buf[8192];

+	int n;

+	char *p;

 	if((fd = open(file, OREAD)) < 0){

-		fprint(2, "cannot open %s: %r", file);

+		fprint(2, "cannot open %s: %r\n", file);

 		return -1;

 	}

-	if((ofd = open("/dev/kbmap", OWRITE)) < 0) {

-		fprint(2, "cannot open /dev/kbmap: %r");

+	if((ofd = open("/dev/kbmap", OWRITE|OTRUNC)) < 0){

+		fprint(2, "cannot open /dev/kbmap: %r\n");

 		close(fd);

 		return -1;

 	}

-	while((i = read(fd, buf, sizeof buf)) > 0)

-		if(write(ofd, buf, i) != i){

-			fprint(2, "writing /dev/kbmap: %r");

+	/* do not write half lines */

+	n = 0;

+	while((i = read(fd, buf + n, sizeof buf - 1 - n)) > 0){

+		n += i;

+		buf[n] = '\0';

+		p = strrchr(buf, '\n');

+		if(p == nil){

+			if(n == sizeof buf - 1){

+				fprint(2, "writing /dev/kbmap: line too long\n");

+				break;

+			}

+			continue;

+		}

+		p++;

+		if(write(ofd, buf, p - buf) !=  p - buf){

+			fprint(2, "writing /dev/kbmap: %r\n");

 			break;

 		}

+		n -= p - buf;

+		memmove(buf, p, n);

+	}

 	close(fd);

 	close(ofd);

@@ -165,7 +183,6 @@

 click(Mouse m)

 {

 	int i, j;

-	char buf[128];

 	if(m.buttons == 0 || (m.buttons & ~4))

 		return;

@@ -193,9 +210,6 @@

 	if(j != i)

 		return;

-	/* since maps are often just a delta of the distributed map... */

-	snprint(buf, sizeof buf, "%s/ascii", dir);

-	writemap(buf);

 	writemap(map[i].file);

 	/* clean the previous current map */

--- a/sys/src/cmd/kbremap.c

+++ b/sys/src/cmd/kbremap.c

@@ -10,16 +10,32 @@

 {

 	int i, fd, ofd;

 	char buf[8192];

+	int n;

+	char *p;

 	if((fd = open(file, OREAD)) < 0)

 		sysfatal("cannot open %s: %r", file);

-	if((ofd = open("/dev/kbmap", OWRITE)) < 0)

+	if((ofd = open("/dev/kbmap", OWRITE|OTRUNC)) < 0)

 		sysfatal("cannot open /dev/kbmap: %r");

-	while((i = read(fd, buf, sizeof buf)) > 0)

-		if(write(ofd, buf, i) != i)

+	/* do not write half lines */

+	n = 0;

+	while((i = read(fd, buf + n, sizeof buf - 1 - n)) > 0){

+		n += i;

+		buf[n] = '\0';

+		p = strrchr(buf, '\n');

+		if(p == nil){

+			if(n == sizeof buf - 1)

+				sysfatal("writing /dev/kbmap: line too long");

+			continue;

+		}

+		p++;

+		if(write(ofd, buf, p - buf) !=  p - buf)

 			sysfatal("writing /dev/kbmap: %r");

+		n -= p - buf;

+		memmove(buf, p, n);

+	}

 	fprint(ofd, "%s\t%s\t0x%X\n", mod, key, Kswitch);

 	close(fd);

@@ -56,7 +72,6 @@

 		usage();

 	chdir("/sys/lib/kbmap");

-	writemap("ascii");

 	writemap(argv[0]);

 	for(;;){

 		n = read(0, buf, sizeof buf - 1);

@@ -66,13 +81,12 @@

 		for(p = buf; p < buf+n; p += strlen(p) + 1){

 			chartorune(&r, p+1);

 			if(*p != 'c' || r != Kswitch){

-				write(1, p, strlen(p));

+				write(1, p, strlen(p) + 1);

 				continue;

 			}

 			index++;

 			if(argv[index] == nil)

 				index = 0;

-			writemap("ascii");

 			writemap(argv[index]);

 		}

 	}