Check parameter count before using argv, report syntax and errors

1 files changed, 5 insertions, 4 deletions

diff --git a/src/export/map_coords.c b/src/export/map_coords.c
index b46f1cf..93c858f 100644
--- a/src/export/map_coords.c
+++ b/src/export/map_coords.c
@@ -18,13 +18,14 @@ int qsort_cmp( const void *a, const void *b )
 
 int main( int argc, char ** args )
 {
-  MAP coords = map_file( args[1], 1 );
-  int i, l, lines;
+  MAP coords;
   char *p, **offsets, *input = malloc(1024);
   ssize_t ll;
-  size_t input_length = 1024;
+  size_t i, l, lines, input_length = 1024;
 
-  if( !coords ) exit( 111 );
+  if( argc != 2 ) { fprintf( stderr, "Syntax: printf %%s\\t%%s\\t%%s <zipcode> <streetname> <housenumber> | %s <coords_file>\n", args[0] ); exit(111); }
+  coords = map_file( args[1], 1 );
+  if( !coords || !input ) { fprintf( stderr, "Error allocating resources\n" );exit( 111 ); }
   p = (char *)coords->addr;
   for ( i=0, lines=0; i<coords->size; ++i )
     if( p[i] == 0x00 )