cpp: Use /tmp folder for output files

There might be a case when input file is located
in read-only directory and cpp fails when it tries to
create output file there, so use /tmp folder for that
as usually it should be writeable for any user.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 5 insertions, 8 deletions

diff --git a/cpp.c b/cpp.c
index 8448252..6734eac 100644
--- a/cpp.c
+++ b/cpp.c
@@ -6,22 +6,19 @@
 
 int cpp_exec(char *in_file, char *out_file, size_t out_len)
 {
-	char cmd[256], *dir, *base;
-	char *a = xstrdup(in_file);
-	char *b = xstrdup(in_file);
+	char *tmp = xstrdup(in_file);
+	char cmd[256], *base;
 	int ret = 0;
 
-	dir = dirname(a);
-	base = basename(b);
+	base = basename(tmp);
 
-	slprintf(out_file, out_len, "%s/.tmp-%u-%s", dir, rand(), base);
+	slprintf(out_file, out_len, "/tmp/.tmp-%u-%s", rand(), base);
 	slprintf(cmd, sizeof(cmd), "cpp -I" ETCDIRE_STRING " %s > %s",
 		 in_file, out_file);
 
 	if (system(cmd) != 0)
 		ret = -1;
 
-	xfree(a);
-	xfree(b);
+	xfree(tmp);
 	return ret;
 }