some testing of atoi, added a limits.h

1 files changed, 22 insertions, 1 deletions

diff --git a/tests/test_itoa.c b/tests/test_itoa.c
index 76df145..837b77a 100644
--- a/tests/test_itoa.c
+++ b/tests/test_itoa.c
@@ -1,13 +1,34 @@
 #include "stdlib.h"
 #include "string.h"
+#include "limits.h"
 
 int main( void )
 {
 	char *res;
-	char buf[11];
+	char buf[12];
 	
+	// simple conversion without sign
 	res = itoa( 568876, buf, 10 );
+	if( strcmp( buf, "568876" ) ) return 1;
+
+	// test if the returned pointer points to the buffer
 	if( strcmp( res, buf ) ) return 1;
+
+	// conversion with sign
+	res = itoa( -568876, buf, 10 );
+	if( strcmp( buf, "-568876" ) ) return 1;
+
+	// convert upper limit
+	res = itoa( INT_MAX, buf, 10 );
+	if( strcmp( buf, "2147483647" ) ) return 1;
+
+	// convert lower limit
+	res = itoa( INT_MIN+1, buf, 10 );
+	if( strcmp( buf, "-2147483647" ) ) return 1;
+	
+	// convert to hex
+	res = itoa( 568876, buf, 16 );
+	if( strcmp( buf, "8AE2C" ) ) return 1;
 	
 	return 0;
 }