From adeffd47ec50cf2fbc5bdf5dd56caaa7bf43d90b Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Mon, 22 Aug 2011 18:08:02 +1000
Subject: [PATCH] nul terminate stream read from a file.

Though we carry around the length of a string and so will not normally
need a nul terminator, we sometimes use sscanf which cannot take a
length and so needs nul termination.

So add a nul when loading from a file or stdin.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 extract.c | 8 ++++----
 load.c    | 6 ++++--
 split.c   | 4 ++--
 wiggle.h  | 2 ++
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/extract.c b/extract.c
index 92d50a3..ce40310 100644
--- a/extract.c
+++ b/extract.c
@@ -118,15 +118,15 @@ int split_patch(struct stream f, struct stream *f1, struct stream *f2)
 				buf[0] = 0;
 				chunks++;
 				sprintf(buf+1, "%5d %5d %5d\n", chunks, a, acnt);
-				memcpy(r1.body+r1.len, buf, 19);
-				r1.len += 19;
+				memcpy(r1.body+r1.len, buf, 20);
+				r1.len += 20;
 			}
 			if (state==2 || state == 3) {
 				char buf[20];
 				buf[0] = 0;
 				sprintf(buf+1, "%5d %5d %5d\n", chunks, c, bcnt);
-				memcpy(r2.body+r2.len, buf, 19);
-				r2.len += 19;
+				memcpy(r2.body+r2.len, buf, 20);
+				r2.len += 20;
 			}
 			break;
 		case 1:
diff --git a/load.c b/load.c
index 23e4e24..b544169 100644
--- a/load.c
+++ b/load.c
@@ -52,7 +52,7 @@ static void join_streams(struct stream list[], int cnt)
 	for (i=0; i<cnt ; i++)
 		len += list[i].len;
 
-	c = realloc(list[0].body, len);
+	c = realloc(list[0].body, len+1);
 	if (c == NULL)
 		die();
 
@@ -64,6 +64,7 @@ static void join_streams(struct stream list[], int cnt)
 		c += list[i].len;
 		list[i].len = 0;
 	}
+	c[0] = 0;
 }
 
 static struct stream load_regular(int fd)
@@ -73,13 +74,14 @@ static struct stream load_regular(int fd)
 	fstat(fd, &stb);
 
 	s.len = stb.st_size;
-	s.body = malloc(s.len);
+	s.body = malloc(s.len+1);
 	if (s.body) {
 		if (read(fd, s.body, s.len) != s.len) {
 			free(s.body);
 			s.body = NULL;
 		}
 	} else die();
+	s.body[s.len] = 0;
 	return s;
 }
 
diff --git a/split.c b/split.c
index 4dfd3f3..ae61408 100644
--- a/split.c
+++ b/split.c
@@ -60,9 +60,9 @@ static int split_internal(char *start, char *end, int type, struct elmnt *list,
 	while (start < end) {
 		char *cp = start;
 
-		if (*cp == '\0' && cp+16 < end && cp[18] == '\n') {
+		if (*cp == '\0' && cp+19 < end && cp[18] == '\n') {
 			/* special word */
-			cp += 19;
+			cp += 20;
 		} else switch(type) {
 		case ByLine:
 			while (cp < end && *cp != '\n')
diff --git a/wiggle.h b/wiggle.h
index 76d4213..73fe809 100644
--- a/wiggle.h
+++ b/wiggle.h
@@ -49,6 +49,8 @@ static  inline int match(struct elmnt *a, struct elmnt *b)
 
 static inline int ends_line(struct elmnt e)
 {
+	if (e.len == 20 && e.start[0] == 0)
+		return 1;
 	return e.len &&  e.start[e.len-1] == '\n';
 }
 
-- 
2.39.5