4 files changed, 15 insertions, 0 deletions
diff --git a/src/apps/cs2cs.cpp b/src/apps/cs2cs.cpp
index 03fd4dba..a8e152a7 100644
--- a/src/apps/cs2cs.cpp
+++ b/src/apps/cs2cs.cpp
@@ -346,6 +346,10 @@ int main(int argc, char **argv) {
     int have_to_flag = 0, inverse = 0;
     int use_env_locale = 0;
 
+    if( argc == 0 ) {
+        exit(1);
+    }
+
     /* This is just to check that pj_init() is locale-safe */
     /* Used by nad/testvarious */
     if (getenv("PROJ_USE_ENV_LOCALE") != nullptr)
diff --git a/src/apps/geod.cpp b/src/apps/geod.cpp
index 6e3f059e..4f48a57a 100644
--- a/src/apps/geod.cpp
+++ b/src/apps/geod.cpp
@@ -136,6 +136,10 @@ int main(int argc, char **argv) {
 	FILE *fid;
 	static int eargc = 0, c;
 
+	if( argc == 0 ) {
+		exit(1);
+	}
+
 	if ((emess_dat.Prog_name = strrchr(*argv,'/')) != nullptr) ++emess_dat.Prog_name;
 	else emess_dat.Prog_name = *argv;
 	inverse = strncmp(emess_dat.Prog_name, "inv", 3) == 0 ||
diff --git a/src/apps/optargpm.h b/src/apps/optargpm.h
index 9a66b9a0..921b8c0b 100644
--- a/src/apps/optargpm.h
+++ b/src/apps/optargpm.h
@@ -415,6 +415,9 @@ OPTARGS *opt_parse (int argc, char **argv, const char *flags, const char *keys,
     int free_format;
     OPTARGS *o;
 
+    if( argc == 0 )
+        return nullptr;
+
     o = (OPTARGS *) calloc (1, sizeof(OPTARGS));
     if (nullptr==o)
         return nullptr;
diff --git a/src/apps/proj.cpp b/src/apps/proj.cpp
index f93164e0..629501e3 100644
--- a/src/apps/proj.cpp
+++ b/src/apps/proj.cpp
@@ -300,6 +300,10 @@ int main(int argc, char **argv) {
     FILE *fid;
     int eargc = 0, mon = 0;
 
+    if( argc == 0 ) {
+        exit(1);
+    }
+
     if ( (emess_dat.Prog_name = strrchr(*argv,DIR_CHAR)) != nullptr)
         ++emess_dat.Prog_name;
     else emess_dat.Prog_name = *argv;