Fix compiler warnings.

[tinc] / src / tincctl.c

diff --git a/src/tincctl.c b/src/tincctl.c
index 87bbfe0..3c7d368 100644 (file)
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -263,19 +263,21 @@ static void disable_old_keys(const char *filename, const char *what) {
        bool disabled = false;
        bool block = false;
        bool error = false;
-       FILE *r, *w;
 
-       r = fopen(filename, "r");
+       FILE *r = fopen(filename, "r");
+       FILE *w = NULL;
 
        if(!r) {
                return;
        }
 
-       snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+       int result = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
 
-       struct stat st = {.st_mode = 0600};
-       fstat(fileno(r), &st);
-       w = fopenmask(tmpfile, "w", st.st_mode);
+       if(result < sizeof(tmpfile)) {
+               struct stat st = {.st_mode = 0600};
+               fstat(fileno(r), &st);
+               w = fopenmask(tmpfile, "w", st.st_mode);
+       }
 
        while(fgets(buf, sizeof(buf), r)) {
                if(!block && !strncmp(buf, "-----BEGIN ", 11)) {