diff options
Diffstat (limited to 'bits_test.c')
| -rw-r--r-- | bits_test.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/bits_test.c b/bits_test.c index b6beb55f..3273c1f1 100644 --- a/bits_test.c +++ b/bits_test.c @@ -83,16 +83,33 @@ static void ledumpall(void) (void)printf("getled: %.16f %.16f\n", d1, getled(buf, 16)); } +struct unsigned_test { + unsigned int start, width; + unsigned long long expected; +}; + /*@ -duplicatequals +ignorequals @*/ int main(void) { + struct unsigned_test *up, unsigned_tests[] = { + {0, 1, 0}, /* first bit of first byte */ + {0, 7, 1}, /* third bit of first byte */ + }; + + unsigned char *sp; + memcpy(buf,"\x01\x02\x03\x04\x05\x06\x07\x08",8); memcpy(buf+8,"\xff\xfe\xfd\xfc\xfb\xfa\xf9\xf8",8); memcpy(buf+16,"\x40\x09\x21\xfb\x54\x44\x2d\x18",8); memcpy(buf+24,"\x40\x49\x0f\xdb",4); + (void)fputs("Test data:", stdout); + for (sp = buf; sp < buf + 28; sp++) + printf(" %02x", *sp); + putc('\n', stdout); + /* big-endian test */ - printf("Big-endian\n"); + printf("Big-endian:\n"); sb1 = getsb(buf, 0); sb2 = getsb(buf, 8); ub1 = getub(buf, 0); @@ -114,7 +131,7 @@ int main(void) bedumpall(); /* little-endian test */ - printf("Little-endian\n"); + printf("Little-endian:\n"); sb1 = getsb(buf, 0); sb2 = getsb(buf, 8); ub1 = getub(buf, 0); @@ -135,5 +152,16 @@ int main(void) d1 = getled(buf, 16); ledumpall(); + + (void)printf("Testing bitfield extraction:\n"); + for (up = unsigned_tests; + up < unsigned_tests+sizeof(unsigned_tests)/sizeof(unsigned_tests[0]); + up++) { + unsigned long long res = ubits((char *)buf, up->start, up->width); + (void)printf("ubits(..., %d, %d) should be %llu, is %llu: %s\n", + up->start, up->width, up->expected, res, + res == up->expected ? "succeeded" : "FAILED"); + } + exit(0); } |