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diff: barf with explanation on binary diffs/merges

--- a/sys/src/cmd/diff/diff.h

+++ b/sys/src/cmd/diff/diff.h

@@ -27,6 +27,7 @@

 	Line *file[2], line;

 	int len[2];

 	int binary;

+	int bindiff;

 	Line *sfile[2];	/*shortened by pruning common prefix and suffix*/

 	int slen[2];

 	int pref, suff;	/*length of prefix and suffix*/

--- a/sys/src/cmd/diff/diffio.c

+++ b/sys/src/cmd/diff/diffio.c

@@ -109,6 +109,11 @@

 	int nbytes;

 	Rune r;

+	if (i == 0) {

+		d->file1 = orig;

+		d->firstchange = 0;

+	} else

+		d->file2 = orig;

 	bp = Bopen(arg, OREAD);

 	if (!bp) {

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

@@ -138,11 +143,6 @@

 	d->len[i] = j;

 	d->file[i] = p;

 	d->input[i] = bp;

-	if (i == 0) {

-		d->file1 = orig;

-		d->firstchange = 0;

-	} else

-		d->file2 = orig;

 	return bp;

 }

--- a/sys/src/cmd/diff/diffreg.c

+++ b/sys/src/cmd/diff/diffreg.c

@@ -315,8 +315,8 @@

 	}

 	if (d->binary){

 		// could use b0 and b1 but this is simpler.

-		if (cmp(b0, b1))

-			print("binary files %s %s differ\n", f, t);

+		if(cmp(b0, b1))

+			d->bindiff = 1;

 		Bterm(b0);

 		Bterm(b1);

 		return;

@@ -356,6 +356,10 @@

 {

 	int m, i0, i1, j0, j1;

+	if(d->bindiff){

+		print("binary files %s %s differ\n", d->file1, d->file2);

+		return;

+	}

 	m = d->len[0];

 	d->J[0] = 0;

 	d->J[m+1] = d->len[1]+1;

@@ -403,8 +407,10 @@

 void

 freediff(Diff *d)

 {

-	Bterm(d->input[0]);

-	Bterm(d->input[1]);

+	if(d->input[0] != nil)

+		Bterm(d->input[0]);

+	if(d->input[1] != nil)

+		Bterm(d->input[1]);

 	free(d->J);

 	free(d->ixold);

 	free(d->ixnew);

--- a/sys/src/cmd/diff/merge3.c

+++ b/sys/src/cmd/diff/merge3.c

@@ -162,6 +162,8 @@

 	memset(&r, 0, sizeof(r));

 	calcdiff(&l, argv[1], argv[1], argv[0], argv[0]);

 	calcdiff(&r, argv[1], argv[1], argv[2], argv[2]);

+	if(l.binary || r.binary)

+		sysfatal("cannot merge binaries");

 	x = merge(&l, &r);

 	freediff(&l);

 	freediff(&r);