Fix segfault when using the 'set' command with no arguments

darcs-hash:20060502162830-ac50b-d3ab63c29a6daeaa62803923b060ec69942911f8.gz

builtin_set.c

@@ -491,7 +491,7 @@ int builtin_set( wchar_t **argv )
 		al_push(&values, argv[woptind++]);
 	}
 
-	if( is_path_variable( dest ) )
+	if( dest && is_path_variable( dest ) )
 	{
 		int i;
 		int error = 0;

common.c

@@ -495,6 +495,12 @@ int contains_str( const wchar_t *a, ... )
 	wchar_t *arg;
 	va_list va;
 	int res = 0;
+
+	if( !a )
+	{
+		debug( 1, L"Warning: Called contains_str with null argument. This is a bug." );		
+		return 0;
+	}
 
 	va_start( va, a );
 	while( (arg=va_arg(va, wchar_t *) )!= 0 ) 

common.h

@@ -181,9 +181,11 @@ void error_reset();
 const wchar_t *wsetlocale( int category, const wchar_t *locale );
 
 /**
-   Checks if \c needle is included in the list of strings specified
+   Checks if \c needle is included in the list of strings specified. A warning is printed if needle is zero.
 
    \param needle the string to search for in the list 
+
+   \return zero is needle is not found, of if needle is null, non-zero otherwise
 */
 int contains_str( const wchar_t *needle, ... );
 

fallback.h

@@ -6,7 +6,7 @@
 #include <stdarg.h>
 #include <wctype.h>
 #include <wchar.h>
-#include "common.h"
+
 
 /**
    Under curses, tputs expects an int (*func)(char) as its last