log.h: add WARN

Fix issue 107

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

cli.c

@@ -195,7 +195,7 @@ struct cli_options *cli_options_parse(int argc, char *argv[]) {
   }
   if (res->vmnet_gateway == NULL) {
     if (res->vmnet_mode != VMNET_BRIDGED_MODE) {
-      ERROR("WARNING: --vmnet-gateway=IP should be explicitly specified to "
+      WARN("--vmnet-gateway=IP should be explicitly specified to "
           "avoid conflicting with other applications");
     }
     if (res->vmnet_dhcp_end != NULL) {

log.h

@@ -14,5 +14,7 @@ extern bool debug;
 #define ERROR(msg)          fprintf(stderr, "ERROR| " msg "\n")
 #define ERRORF(fmt, ...)    fprintf(stderr, "ERROR| " fmt "\n", __VA_ARGS__)
 #define ERRORN(name)        ERRORF(name ": %s", strerror(errno))
+#define WARN(msg)           fprintf(stderr, "WARN | " msg "\n")
+#define WARNF(fmt, ...)     fprintf(stderr, "WARN | " fmt "\n", __VA_ARGS__)
 
 #endif /* SOCKET_VMNET_LOG_H */

main.c

@@ -400,12 +400,10 @@ int main(int argc, char *argv[]) {
   struct cli_options *cliopt = cli_options_parse(argc, argv);
   assert(cliopt != NULL);
   if (geteuid() != 0) {
-    ERROR("WARNING: Running without root. This is very unlikely to "
-          "work: See README.md");
+    WARN("Running without root. This is very unlikely to work: See README.md");
   }
   if (geteuid() != getuid()) {
-    ERROR("WARNING: Seems running with SETUID. This is insecure and "
-          "highly discouraged: See README.md");
+    WARN("Seems running with SETUID. This is insecure and highly discouraged: See README.md");
   }
 
   if (sigsetjmp(jmpbuf, 1) != 0) {