6 files changed, 6 insertions, 9 deletions
diff --git a/src/cmd/eqn/main.c b/src/cmd/eqn/main.c
index 518c6b94..677fe192 100644
--- a/src/cmd/eqn/main.c
+++ b/src/cmd/eqn/main.c
@@ -7,7 +7,7 @@
 
 char *version = "version Oct 24, 1991";
 
-char	in[MAXLINE];	/* input buffer */
+char	in[MAXLINE+1];	/* input buffer */
 int	noeqn;
 char	*cmdname;
 
diff --git a/src/cmd/jpg/readgif.c b/src/cmd/jpg/readgif.c
index 22a0b68c..22365669 100644
--- a/src/cmd/jpg/readgif.c
+++ b/src/cmd/jpg/readgif.c
@@ -351,11 +351,8 @@ skipextension(Header *h)
 	}
 	if(hsize>0 && Bread(h->fd, h->buf, hsize) != hsize)
 		giferror(h, extreaderr);
-	if(!hasdata){
-		if(h->buf[hsize-1] != 0)
-			giferror(h, "ReadGIF: bad extension format");
+	if(!hasdata)
 		return;
-	}
 
 	/* loop counter: Application Extension with NETSCAPE2.0 as string and 1 <loop.count> in data */
 	if(type == 0xFF && hsize==11 && memcmp(h->buf, "NETSCAPE2.0", 11)==0){
diff --git a/src/cmd/tapefs/32vfs.c b/src/cmd/tapefs/32vfs.c
index adccd590..1d917f82 100644
--- a/src/cmd/tapefs/32vfs.c
+++ b/src/cmd/tapefs/32vfs.c
@@ -93,7 +93,7 @@ popdir(Ram *r)
 			continue;
 		f = iget(ino);
 		strncpy(name, dp->name, VNAMELEN);
-		name[VNAMELEN+1] = '\0';
+		name[VNAMELEN] = '\0';
 		f.name = name;
 		popfile(r, f);
 	}
diff --git a/src/cmd/tapefs/v10fs.c b/src/cmd/tapefs/v10fs.c
index a2f546cd..c2875b84 100644
--- a/src/cmd/tapefs/v10fs.c
+++ b/src/cmd/tapefs/v10fs.c
@@ -84,7 +84,7 @@ popdir(Ram *r)
 			continue;
 		f = iget(ino);
 		strncpy(name, dp->name, VNAMELEN);
-		name[VNAMELEN+1] = '\0';
+		name[VNAMELEN] = '\0';
 		f.name = name;
 		popfile(r, f);
 	}
diff --git a/src/cmd/tapefs/v6fs.c b/src/cmd/tapefs/v6fs.c
index 648c2128..74c6737c 100644
--- a/src/cmd/tapefs/v6fs.c
+++ b/src/cmd/tapefs/v6fs.c
@@ -85,7 +85,7 @@ popdir(Ram *r)
 			continue;
 		f = iget(ino);
 		strncpy(name, dp->name, V6NAMELEN);
-		name[V6NAMELEN+1] = '\0';
+		name[V6NAMELEN] = '\0';
 		f.name = name;
 		popfile(r, f);
 	}
diff --git a/src/cmd/troff/t10.c b/src/cmd/troff/t10.c
index 38090eac..b037bdda 100644
--- a/src/cmd/troff/t10.c
+++ b/src/cmd/troff/t10.c
@@ -75,7 +75,7 @@ void t_ptinit(void)
 	ics = EM;	/* insertion character space */
 	for (i = 0; i < (NTAB - 1) && DTAB * (i + 1) < TABMASK; i++)
 		tabtab[i] = DTAB * (i + 1);
-	tabtab[NTAB] = 0;
+	tabtab[NTAB-1] = 0;
 	pl = 11 * INCH;			/* paper length */
 	po = PO;		/* page offset */
 	spacesz = SS;