bitXXgen: add bitgen_test.c
The autogenerated bitXXgen.h headers for osmo_load16le_ext() thru
osmo_store64_be() are not actually tested at all. Add a test.
The test output shows that the osmo_load*be_ext for a shorter len do not return
nicely matching results. A practical example showing the difficulty in storing
and loading 24bit integer values as/from big-endian:
uint8_t buf[4];
memset(buf, 0, sizeof(buf));
osmo_store32be_ext(0x00112233, buf, 3); // stores 11 22 33
printf("%s\n", osmo_hexdump(buf, 4));
uint32_t r = osmo_load32be_ext(buf, 3); // returns 0x11223300, not 0x00112233
printf("0x%x\n", r);
output is:
11 22 33 00
0x11223300
In contrast, the little-endian variant properly aligns the loaded bytes on the
least significant octet:
uint8_t buf[4];
memset(buf, 0, sizeof(buf));
osmo_store32le_ext(0x00112233, buf, 3); // stores 33 22 11
printf("%s\n", osmo_hexdump(buf, 4));
uint32_t r = osmo_load32le_ext(buf, 3); // returns 0x00112233 as expected
printf("0x%x\n", r);
output for le is:
33 22 11 00
0x112233
Change-Id: I5542ace54376a206aa8574812d4c742c86c293b4
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 1955800..493c16f 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -396,3 +396,9 @@
cat $abs_srcdir/i460_mux/i460_mux_test.ok > expout
AT_CHECK([$abs_top_builddir/tests/i460_mux/i460_mux_test], [0], [expout], [ignore])
AT_CLEANUP
+
+AT_SETUP([bitgen])
+AT_KEYWORDS([bitgen])
+cat $abs_srcdir/bitgen/bitgen_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/bitgen/bitgen_test], [0], [expout], [ignore])
+AT_CLEANUP