[PATCH 3/3] all: get rid of strndupa

[Tycho Andersen]

in one case (src/auditd.c) we don't even need to allocate a buffer, in the
other two we do it in two steps to avoid using a non-standard function.

Signed-off-by: Tycho Andersen <tycho at docker.com>
---
 auparse/auparse.c  |  6 ++++--
 src/auditd.c       | 10 +++++-----
 src/ausearch-lol.c |  6 ++++--
 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/auparse/auparse.c b/auparse/auparse.c
index 3677ad7..b428330 100644
--- a/auparse/auparse.c
+++ b/auparse/auparse.c
@@ -1096,10 +1096,12 @@ static int extract_timestamp(const char *b, au_event_t *e)
 	int rc = 1;
 
         e->host = NULL;
+
+	tmp = alloca(340);
 	if (*b == 'n')
-		tmp = strndupa(b, 340);
+		tmp = strncpy(tmp, b, 340);
 	else
-		tmp = strndupa(b, 80);
+		tmp = strncpy(tmp, b, 80);
 	ptr = audit_strsplit(tmp);
 	if (ptr) {
 		// Optionally grab the node - may or may not be included
diff --git a/src/auditd.c b/src/auditd.c
index 3f0162d..a1c2c51 100644
--- a/src/auditd.c
+++ b/src/auditd.c
@@ -185,7 +185,7 @@ static void child_handler2( int sig )
 
 static int extract_type(const char *str)
 {
-	const char *tptr, *ptr2, *ptr = str;
+	const char *ptr2, *ptr = str;
 	if (*str == 'n') {
 		ptr = strchr(str+1, ' ');
 		if (ptr == NULL)
@@ -194,12 +194,12 @@ static int extract_type(const char *str)
 	}
 	// ptr should be at 't'
 	ptr2 = strchr(ptr, ' ');
-	// get type=xxx in a buffer
-	tptr = strndupa(ptr, ptr2 - ptr);
+
 	// find =
-	str = strchr(tptr, '=');
-	if (str == NULL)
+	str = strchr(ptr, '=');
+	if (str == NULL || str >= ptr2)
 		return -1; // Malformed - bomb out
+
 	// name is 1 past
 	str++;
 	return audit_name_to_msg_type(str);
diff --git a/src/ausearch-lol.c b/src/ausearch-lol.c
index b1aec06..5d461b0 100644
--- a/src/ausearch-lol.c
+++ b/src/ausearch-lol.c
@@ -135,10 +135,12 @@ static int extract_timestamp(const char *b, event *e)
 	char *ptr, *tmp, *tnode, *ttype;
 
 	e->node = NULL;
+
+	tmp = alloca(340);
 	if (*b == 'n')
-		tmp = strndupa(b, 340);
+		tmp = strncpy(tmp, b, 340);
 	else
-		tmp = strndupa(b, 80);
+		tmp = strncpy(tmp, b, 80);
 	ptr = audit_strsplit(tmp);
 	if (ptr) {
 		// Check to see if this is the node info
-- 
2.9.3