add diff -a

src/cmd/diff/diffio.c

@@ -302,6 +302,7 @@ change(int a, int b, int c, int d)
 		range(a, b, " ");
 		break;
 	case 'c':
+	case 'a':
 		if(nchanges%1024 == 0)
 			changes = erealloc(changes, (nchanges+1024)*sizeof(changes[0]));
 		ch = &changes[nchanges++];
@@ -348,24 +349,39 @@ flushchanges(void)
 	
 	for(i=0; i<nchanges; ){
 		j = changeset(i);
-		a = changes[i].a;
-		b = changes[j-1].b;
-		c = changes[i].c;
-		d = changes[j-1].d;
+		a = changes[i].a-Lines;
+		b = changes[j-1].b+Lines;
+		c = changes[i].c-Lines;
+		d = changes[j-1].d+Lines;
+		if(a < 1)
+			a = 1;
+		if(c < 1)
+			c = 1;
+		if(b > len[0])
+			b = len[0];
+		if(d > len[1])
+			d = len[1];
+		if(mode == 'a'){
+			a = 1;
+			b = len[0];
+			c = 1;
+			d = len[1];
+			j = nchanges;
+		}
 		Bprint(&stdout, "%s:", file1);
 		range(a, b, ",");
 		Bprint(&stdout, " - ");
 		Bprint(&stdout, "%s:", file2);
 		range(c, d, ",");
 		Bputc(&stdout, '\n');
-		at = a-Lines;
+		at = a;
 		for(; i<j; i++){
 			fetch(ixold, at, changes[i].a-1, input[0], "  ");
 			fetch(ixold, changes[i].a, changes[i].b, input[0], "< ");
 			fetch(ixnew, changes[i].c, changes[i].d, input[1], "> ");
 			at = changes[i].b+1;
 		}
-		fetch(ixold, at, b+Lines, input[0], "  ");
+		fetch(ixold, at, b, input[0], "  ");
 	}
 	nchanges = 0;
 }

src/cmd/diff/main.c

@@ -8,7 +8,7 @@
 
 Biobuf	stdout;
 
-static char *tmp[] = {"/tmp/diff1", "/tmp/diff2"};
+static char *tmp[] = {"/tmp/diff1XXXXXXXXXXX", "/tmp/diff2XXXXXXXXXXX"};
 static int whichtmp;
 static char *progname;
 static char usage[] = "diff [ -efmnbwr ] file1 ... file2\n";
@@ -26,8 +26,6 @@ void
 done(int status)
 {
 	rmtmpfiles();
-Bflush(&stdout);
-Bterm(&stdout);
 	switch(status)
 	{
 	case 0:
@@ -83,8 +81,11 @@ mktmpfile(int input, Dir **sb)
 	char buf[8192];
 
 	atnotify(catch, 1);
-	p = tmp[whichtmp++];
+/*
+	p = mktemp(tmp[whichtmp++]);
 	fd = create(p, OWRITE, 0600);
+*/
+	fd = mkstemp(p=tmp[whichtmp++]);
 	if (fd < 0) {
 		panic(mflag ? 0: 2, "cannot create %s: %r\n", p);
 		return 0;
@@ -172,7 +173,6 @@ diff(char *f, char *t, int level)
 	}
 	free(fsb);
 	free(tsb);
-
 Return:
 	rmtmpfiles();
 }
@@ -189,10 +189,12 @@ main(int argc, char *argv[])
 	while (--argc && (*++argv)[0] == '-' && (*argv)[1]) {
 		for (p = *argv+1; *p; p++) {
 			switch (*p) {
-			case 'c':
+
 			case 'e':
 			case 'f':
 			case 'n':
+			case 'c':
+			case 'a':
 				mode = *p;
 				break;
 
@@ -238,7 +240,6 @@ main(int argc, char *argv[])
 	free(tsb);
 	for (i = 0; i < argc-1; i++)
 		diff(argv[i], argv[argc-1], 0);
-
 	done(anychange);
 	/*NOTREACHED*/
 }