X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdlib%2Fstrtoul.c;h=c134aa2288e4a0036930d5a67cd37a8f98d9f237;hb=e1c526e9bad3f6e69391e94059096145390508d3;hp=4aefc4f08785c6b6dd934f6abfdf9efa0907d8ee;hpb=54fc1aef7a9754a3daa803e47a59d76a8173d703;p=pdclib

diff --git a/functions/stdlib/strtoul.c b/functions/stdlib/strtoul.c
index 4aefc4f..c134aa2 100644
--- a/functions/stdlib/strtoul.c
+++ b/functions/stdlib/strtoul.c
@@ -1,5 +1,3 @@
-/* $Id$ */
-
 /* strtoul( const char *, char * *, int )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -75,6 +73,31 @@ int main( void )
     endptr = NULL;
     TESTCASE( strtoul( overflow, &endptr, 0 ) == 0 );
     TESTCASE( endptr == overflow );
+    /* TODO: These tests assume two-complement, but conversion should work */
+    /* for one-complement and signed magnitude just as well. Anyone having */
+    /* a platform to test this on?                                         */
+    errno = 0;
+/* long -> 32 bit */
+#if ULONG_MAX >> 31 == 1
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoul( "4294967295", NULL, 0 ) == ULONG_MAX );
+    TESTCASE( errno == 0 );
+    errno = 0;
+    TESTCASE( strtoul( "4294967296", NULL, 0 ) == ULONG_MAX );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+/* long -> 64 bit */
+#elif ULONG_MAX >> 63 == 1
+    /* testing "even" overflow, i.e. base is power of two */
+    TESTCASE( strtoul( "18446744073709551615", NULL, 0 ) == ULONG_MAX );
+    TESTCASE( errno == 0 );
+    errno = 0;
+    TESTCASE( strtoul( "18446744073709551616", NULL, 0 ) == ULONG_MAX );
+    TESTCASE( errno == ERANGE );
+    /* TODO: test "odd" overflow, i.e. base is not power of two */
+#else
+#error Unsupported width of 'long' (neither 32 nor 64 bit).
+#endif
     return TEST_RESULTS;
 }