X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=tests%2Ftest-util.c;h=ffd4dcefd8ef0110f1131518164fd1d97883eb86;hb=003ce655b7116d18c86a74c50391e54990346931;hp=45ea8f29feb8f69281d6821db4f055064873e10b;hpb=ddc4f8e27f231b35df0c73a16bacc17396fb00f3;p=sliver-openvswitch.git

diff --git a/tests/test-util.c b/tests/test-util.c
index 45ea8f29f..ffd4dcefd 100644
--- a/tests/test-util.c
+++ b/tests/test-util.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2012 Nicira Networks.
+ * Copyright (c) 2011, 2012, 2013, 2014 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,14 +16,21 @@
 
 #include <config.h>
 
+#include <getopt.h>
 #include <inttypes.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #include "byte-order.h"
+#include "command-line.h"
 #include "random.h"
 #include "util.h"
+#include "vlog.h"
+#include "ovstest.h"
+
+#undef NDEBUG
+#include <assert.h>
 
 static void
 check_log_2_floor(uint32_t x, int n)
@@ -36,15 +43,245 @@ check_log_2_floor(uint32_t x, int n)
 }
 
 static void
-check_ctz(uint32_t x, int n)
+test_log_2_floor(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n;
+
+    for (n = 0; n < 32; n++) {
+        /* Check minimum x such that f(x) == n. */
+        check_log_2_floor(1 << n, n);
+
+        /* Check maximum x such that f(x) == n. */
+        check_log_2_floor((1 << n) | ((1 << n) - 1), n);
+
+        /* Check a random value in the middle. */
+        check_log_2_floor((random_uint32() & ((1 << n) - 1)) | (1 << n), n);
+    }
+
+    /* log_2_floor(0) is undefined, so don't check it. */
+}
+
+static void
+check_ctz32(uint32_t x, int n)
+{
+    if (ctz32(x) != n) {
+        fprintf(stderr, "ctz32(%"PRIu32") is %d but should be %d\n",
+                x, ctz32(x), n);
+        abort();
+    }
+}
+
+static void
+check_ctz64(uint64_t x, int n)
+{
+    if (ctz64(x) != n) {
+        fprintf(stderr, "ctz64(%"PRIu64") is %d but should be %d\n",
+                x, ctz64(x), n);
+        abort();
+    }
+}
+
+static void
+test_ctz(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n;
+
+    for (n = 0; n < 32; n++) {
+        /* Check minimum x such that f(x) == n. */
+        check_ctz32(1 << n, n);
+
+        /* Check maximum x such that f(x) == n. */
+        check_ctz32(UINT32_MAX << n, n);
+
+        /* Check a random value in the middle. */
+        check_ctz32((random_uint32() | 1) << n, n);
+    }
+
+
+    for (n = 0; n < 64; n++) {
+        /* Check minimum x such that f(x) == n. */
+        check_ctz64(UINT64_C(1) << n, n);
+
+        /* Check maximum x such that f(x) == n. */
+        check_ctz64(UINT64_MAX << n, n);
+
+        /* Check a random value in the middle. */
+        check_ctz64((random_uint64() | UINT64_C(1)) << n, n);
+    }
+
+    /* Check ctz(0). */
+    check_ctz32(0, 32);
+    check_ctz64(0, 64);
+}
+
+static void
+check_clz32(uint32_t x, int n)
+{
+    if (clz32(x) != n) {
+        fprintf(stderr, "clz32(%"PRIu32") is %d but should be %d\n",
+                x, clz32(x), n);
+        abort();
+    }
+}
+
+static void
+check_clz64(uint64_t x, int n)
+{
+    if (clz64(x) != n) {
+        fprintf(stderr, "clz64(%"PRIu64") is %d but should be %d\n",
+                x, clz64(x), n);
+        abort();
+    }
+}
+
+static void
+test_clz(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n;
+
+    for (n = 0; n < 32; n++) {
+        /* Check minimum x such that f(x) == n. */
+        check_clz32((1u << 31) >> n, n);
+
+        /* Check maximum x such that f(x) == n. */
+        check_clz32(UINT32_MAX >> n, n);
+
+        /* Check a random value in the middle. */
+        check_clz32((random_uint32() | 1u << 31) >> n, n);
+    }
+
+    for (n = 0; n < 64; n++) {
+        /* Check minimum x such that f(x) == n. */
+        check_clz64((UINT64_C(1) << 63) >> n, n);
+
+        /* Check maximum x such that f(x) == n. */
+        check_clz64(UINT64_MAX >> n, n);
+
+        /* Check a random value in the middle. */
+        check_clz64((random_uint64() | UINT64_C(1) << 63) >> n, n);
+    }
+
+    /* Check clz(0). */
+    check_clz32(0, 32);
+    check_clz64(0, 64);
+}
+
+/* Returns a random number in the range 'min'...'max' inclusive. */
+static uint32_t
+random_in_range(uint32_t min, uint32_t max)
+{
+    return min == max ? min : min + random_range(max - min + 1);
+}
+
+static void
+check_rup2(uint32_t x, int n)
+{
+    uint32_t rup2 = ROUND_UP_POW2(x);
+    if (rup2 != n) {
+        fprintf(stderr, "ROUND_UP_POW2(%#"PRIx32") is %#"PRIx32" "
+                "but should be %#"PRIx32"\n", x, rup2, n);
+        abort();
+    }
+}
+
+static void
+test_round_up_pow2(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n;
+
+    for (n = 0; n < 32; n++) {
+        /* Min, max value for which ROUND_UP_POW2 should yield (1 << n). */
+        uint32_t min = ((1u << n) >> 1) + 1;
+        uint32_t max = 1u << n;
+
+        check_rup2(min, 1u << n);
+        check_rup2(max, 1u << n);
+        check_rup2(random_in_range(min, max), 1u << n);
+    }
+    check_rup2(0, 0);
+}
+
+static void
+check_rdp2(uint32_t x, int n)
+{
+    uint32_t rdp2 = ROUND_DOWN_POW2(x);
+    if (rdp2 != n) {
+        fprintf(stderr, "ROUND_DOWN_POW2(%#"PRIx32") is %#"PRIx32" "
+                "but should be %#"PRIx32"\n", x, rdp2, n);
+        abort();
+    }
+}
+
+static void
+test_round_down_pow2(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n;
+
+    for (n = 0; n < 32; n++) {
+        /* Min, max value for which ROUND_DOWN_POW2 should yield (1 << n). */
+        uint32_t min = 1u << n;
+        uint32_t max = ((1u << n) << 1) - 1;
+
+        check_rdp2(min, 1u << n);
+        check_rdp2(max, 1u << n);
+        check_rdp2(random_in_range(min, max), 1u << n);
+    }
+    check_rdp2(0, 0);
+}
+
+static void
+shuffle(uint64_t *p, size_t n)
+{
+    for (; n > 1; n--, p++) {
+        uint64_t *q = &p[random_range(n)];
+        uint64_t tmp = *p;
+        *p = *q;
+        *q = tmp;
+    }
+}
+
+static void
+check_count_1bits(uint64_t x, int n)
 {
-    if (ctz(x) != n) {
-        fprintf(stderr, "ctz(%"PRIu32") is %d but should be %d\n",
-                x, ctz(x), n);
+    if (count_1bits(x) != n) {
+        fprintf(stderr, "count_1bits(%#"PRIx64") is %d but should be %d\n",
+                x, count_1bits(x), n);
         abort();
     }
 }
 
+static void
+test_count_1bits(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    uint64_t bits[64];
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(bits); i++) {
+        bits[i] = UINT64_C(1) << i;
+    }
+
+    check_count_1bits(0, 0);
+
+    for (i = 0; i < 1000; i++) {
+        uint64_t x = 0;
+        int j;
+
+        shuffle(bits, ARRAY_SIZE(bits));
+        for (j = 0; j < 64; j++) {
+            x |= bits[j];
+            check_count_1bits(x, j + 1);
+        }
+        assert(x == UINT64_MAX);
+
+        shuffle(bits, ARRAY_SIZE(bits));
+        for (j = 63; j >= 0; j--) {
+            x &= ~bits[j];
+            check_count_1bits(x, j);
+        }
+        assert(x == 0);
+    }
+}
+
 /* Returns the sum of the squares of the first 'n' positive integers. */
 static unsigned int
 sum_of_squares(int n)
@@ -53,7 +290,7 @@ sum_of_squares(int n)
 }
 
 static void
-check_bitwise_copy(void)
+test_bitwise_copy(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
 {
     unsigned int n_loops;
     int src_ofs;
@@ -102,30 +339,754 @@ check_bitwise_copy(void)
     }
 }
 
-int
-main(void)
+static void
+test_bitwise_zero(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
 {
-    int n;
+    unsigned int n_loops;
+    int dst_ofs;
+    int n_bits;
 
-    for (n = 0; n < 32; n++) {
-        /* Check minimum x such that f(x) == n. */
-        check_log_2_floor(1 << n, n);
-        check_ctz(1 << n, n);
+    n_loops = 0;
+    for (n_bits = 0; n_bits <= 64; n_bits++) {
+        for (dst_ofs = 0; dst_ofs < 64 - n_bits; dst_ofs++) {
+            ovs_be64 dst = htonll(random_uint64());
+            ovs_be64 orig_dst = dst;
+            ovs_be64 expect;
 
-        /* Check maximum x such that f(x) == n. */
-        check_log_2_floor((1 << n) | ((1 << n) - 1), n);
-        check_ctz(UINT32_MAX << n, n);
+            if (n_bits == 64) {
+                expect = htonll(0);
+            } else {
+                uint64_t mask = (UINT64_C(1) << n_bits) - 1;
+                expect = orig_dst & ~htonll(mask << dst_ofs);
+            }
 
-        /* Check a random value in the middle. */
-        check_log_2_floor((random_uint32() & ((1 << n) - 1)) | (1 << n), n);
-        check_ctz((random_uint32() | 1) << n, n);
+            bitwise_zero(&dst, sizeof dst, dst_ofs, n_bits);
+            if (expect != dst) {
+                fprintf(stderr,"bitwise_zero(0x%016"PRIx64",8,%d, %d) "
+                        "yielded 0x%016"PRIx64" "
+                        "instead of the expected 0x%016"PRIx64"\n",
+                        ntohll(orig_dst), dst_ofs,
+                        n_bits,
+                        ntohll(dst), ntohll(expect));
+                abort();
+            }
+
+            n_loops++;
+        }
+    }
+
+    if (n_loops != 64 * (64 + 1) / 2) {
+        abort();
+    }
+}
+
+static void
+test_bitwise_one(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    unsigned int n_loops;
+    int dst_ofs;
+    int n_bits;
+
+    n_loops = 0;
+    for (n_bits = 0; n_bits <= 64; n_bits++) {
+        for (dst_ofs = 0; dst_ofs < 64 - n_bits; dst_ofs++) {
+            ovs_be64 dst = htonll(random_uint64());
+            ovs_be64 orig_dst = dst;
+            ovs_be64 expect;
+
+            if (n_bits == 64) {
+                expect = OVS_BE64_MAX;
+            } else {
+                uint64_t mask = (UINT64_C(1) << n_bits) - 1;
+                expect = orig_dst | htonll(mask << dst_ofs);
+            }
+
+            bitwise_one(&dst, sizeof dst, dst_ofs, n_bits);
+            if (expect != dst) {
+                fprintf(stderr,"bitwise_one(0x%016"PRIx64",8,%d, %d) "
+                        "yielded 0x%016"PRIx64" "
+                        "instead of the expected 0x%016"PRIx64"\n",
+                        ntohll(orig_dst), dst_ofs,
+                        n_bits,
+                        ntohll(dst), ntohll(expect));
+                abort();
+            }
+
+            n_loops++;
+        }
+    }
+
+    if (n_loops != 64 * (64 + 1) / 2) {
+        abort();
+    }
+}
+
+static void
+test_bitwise_is_all_zeros(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    int n_loops;
+
+    for (n_loops = 0; n_loops < 100; n_loops++) {
+        ovs_be64 x = htonll(0);
+        int i;
+
+        for (i = 0; i < 64; i++) {
+            ovs_be64 bit;
+            int ofs, n;
+
+            /* Change a random 0-bit into a 1-bit. */
+            do {
+                bit = htonll(UINT64_C(1) << (random_range(64)));
+            } while (x & bit);
+            x |= bit;
+
+            for (ofs = 0; ofs < 64; ofs++) {
+                for (n = 0; n <= 64 - ofs; n++) {
+                    bool expect;
+                    bool answer;
+
+                    expect = (n == 64
+                              ? x == 0
+                              : !(x & htonll(((UINT64_C(1) << n) - 1)
+                                             << ofs)));
+                    answer = bitwise_is_all_zeros(&x, sizeof x, ofs, n);
+                    if (expect != answer) {
+                        fprintf(stderr,
+                                "bitwise_is_all_zeros(0x%016"PRIx64",8,%d,%d "
+                                "returned %s instead of %s\n",
+                                ntohll(x), ofs, n,
+                                answer ? "true" : "false",
+                                expect ? "true" : "false");
+                        abort();
+                    }
+                }
+            }
+        }
     }
+}
 
-    /* Check ctz(0).
-     * (log_2_floor(0) is undefined.) */
-    check_ctz(0, 32);
+static void
+test_follow_symlinks(int argc, char *argv[])
+{
+    int i;
 
-    check_bitwise_copy();
+    for (i = 1; i < argc; i++) {
+        char *target = follow_symlinks(argv[i]);
+        puts(target);
+        free(target);
+    }
+}
 
-    return 0;
+static void
+test_assert(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    ovs_assert(false);
 }
+
+static void
+test_ovs_scan(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    char str[16], str2[16], str3[16];
+    long double ld, ld2;
+    long long ll, ll2;
+    signed char c, c2;
+    ptrdiff_t pd, pd2;
+    intmax_t im, im2;
+    size_t sz, sz2;
+    int n, n2, n3;
+    double d, d2;
+    short s, s2;
+    float f, f2;
+    long l, l2;
+    int i, i2;
+
+    ovs_assert(ovs_scan("", ""));
+    ovs_assert(ovs_scan("", " "));
+    ovs_assert(ovs_scan(" ", " "));
+    ovs_assert(ovs_scan("  ", " "));
+    ovs_assert(ovs_scan(" \t ", " "));
+
+    ovs_assert(ovs_scan("xyzzy", "xyzzy"));
+    ovs_assert(ovs_scan("xy%zzy", "xy%%zzy"));
+    ovs_assert(!ovs_scan(" xy%zzy", "xy%%zzy"));
+    ovs_assert(ovs_scan("    xy%\tzzy", " xy%% zzy"));
+
+    ovs_assert(ovs_scan("123", "%d", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0", "%d", &i));
+    ovs_assert(i == 0);
+    ovs_assert(!ovs_scan("123", "%d%d", &i, &i2));
+    ovs_assert(ovs_scan("+123", "%d", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("-123", "%d", &i));
+    ovs_assert(i == -123);
+    ovs_assert(ovs_scan("0123", "%d", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan(" 123", "%d", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0x123", "%d", &i));
+    ovs_assert(i == 0);
+    ovs_assert(ovs_scan("123", "%2d %d", &i, &i2));
+    ovs_assert(i == 12);
+    ovs_assert(i2 == 3);
+    ovs_assert(ovs_scan("+123", "%2d %d", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%2d %d", &i, &i2));
+    ovs_assert(i == -1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("0123", "%2d %d", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("123", "%*2d %d", &i));
+    ovs_assert(i == 3);
+    ovs_assert(ovs_scan("+123", "%2d %*d", &i));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%*2d %*d"));
+
+    ovs_assert(ovs_scan("123", "%u", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0", "%u", &i));
+    ovs_assert(i == 0);
+    ovs_assert(!ovs_scan("123", "%u%u", &i, &i2));
+    ovs_assert(ovs_scan("+123", "%u", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("-123", "%u", &i));
+    ovs_assert(i == -123);
+    ovs_assert(ovs_scan("0123", "%u", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan(" 123", "%u", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0x123", "%u", &i));
+    ovs_assert(i == 0);
+    ovs_assert(ovs_scan("123", "%2u %u", &i, &i2));
+    ovs_assert(i == 12);
+    ovs_assert(i2 == 3);
+    ovs_assert(ovs_scan("+123", "%2u %u", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%2u %u", &i, &i2));
+    ovs_assert(i == -1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("0123", "%2u %u", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("123", "%*2u %u", &i));
+    ovs_assert(i == 3);
+    ovs_assert(ovs_scan("+123", "%2u %*u", &i));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%*2u %*u"));
+
+    ovs_assert(ovs_scan("123", "%i", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0", "%i", &i));
+    ovs_assert(i == 0);
+    ovs_assert(!ovs_scan("123", "%i%i", &i, &i2));
+    ovs_assert(ovs_scan("+123", "%i", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("-123", "%i", &i));
+    ovs_assert(i == -123);
+    ovs_assert(ovs_scan("0123", "%i", &i));
+    ovs_assert(i == 0123);
+    ovs_assert(ovs_scan(" 123", "%i", &i));
+    ovs_assert(i == 123);
+    ovs_assert(ovs_scan("0x123", "%i", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan("123", "%2i %i", &i, &i2));
+    ovs_assert(i == 12);
+    ovs_assert(i2 == 3);
+    ovs_assert(ovs_scan("+123", "%2i %i", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%2i %i", &i, &i2));
+    ovs_assert(i == -1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("0123", "%2i %i", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("123", "%*2i %i", &i));
+    ovs_assert(i == 3);
+    ovs_assert(ovs_scan("+123", "%2i %*i", &i));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 23);
+    ovs_assert(ovs_scan("-123", "%*2i %*i"));
+
+    ovs_assert(ovs_scan("123", "%o", &i));
+    ovs_assert(i == 0123);
+    ovs_assert(ovs_scan("0", "%o", &i));
+    ovs_assert(i == 0);
+    ovs_assert(!ovs_scan("123", "%o%o", &i, &i2));
+    ovs_assert(ovs_scan("+123", "%o", &i));
+    ovs_assert(i == 0123);
+    ovs_assert(ovs_scan("-123", "%o", &i));
+    ovs_assert(i == -0123);
+    ovs_assert(ovs_scan("0123", "%o", &i));
+    ovs_assert(i == 0123);
+    ovs_assert(ovs_scan(" 123", "%o", &i));
+    ovs_assert(i == 0123);
+    ovs_assert(ovs_scan("0x123", "%o", &i));
+    ovs_assert(i == 0);
+    ovs_assert(ovs_scan("123", "%2o %o", &i, &i2));
+    ovs_assert(i == 012);
+    ovs_assert(i2 == 3);
+    ovs_assert(ovs_scan("+123", "%2o %o", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 023);
+    ovs_assert(ovs_scan("-123", "%2o %o", &i, &i2));
+    ovs_assert(i == -1);
+    ovs_assert(i2 == 023);
+    ovs_assert(ovs_scan("0123", "%2o %o", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 023);
+    ovs_assert(ovs_scan("123", "%*2o %o", &i));
+    ovs_assert(i == 3);
+    ovs_assert(ovs_scan("+123", "%2o %*o", &i));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 023);
+    ovs_assert(ovs_scan("-123", "%*2o %*o"));
+
+    ovs_assert(ovs_scan("123", "%x", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan("0", "%x", &i));
+    ovs_assert(i == 0);
+    ovs_assert(!ovs_scan("123", "%x%x", &i, &i2));
+    ovs_assert(ovs_scan("+123", "%x", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan("-123", "%x", &i));
+    ovs_assert(i == -0x123);
+    ovs_assert(ovs_scan("0123", "%x", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan(" 123", "%x", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan("0x123", "%x", &i));
+    ovs_assert(i == 0x123);
+    ovs_assert(ovs_scan("123", "%2x %x", &i, &i2));
+    ovs_assert(i == 0x12);
+    ovs_assert(i2 == 3);
+    ovs_assert(ovs_scan("+123", "%2x %x", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 0x23);
+    ovs_assert(ovs_scan("-123", "%2x %x", &i, &i2));
+    ovs_assert(i == -1);
+    ovs_assert(i2 == 0x23);
+    ovs_assert(ovs_scan("0123", "%2x %x", &i, &i2));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 0x23);
+    ovs_assert(ovs_scan("123", "%*2x %x", &i));
+    ovs_assert(i == 3);
+    ovs_assert(ovs_scan("+123", "%2x %*x", &i));
+    ovs_assert(i == 1);
+    ovs_assert(i2 == 0x23);
+    ovs_assert(ovs_scan("-123", "%*2x %*x"));
+
+    ovs_assert(ovs_scan("123", "%hd", &s));
+    ovs_assert(s == 123);
+    ovs_assert(!ovs_scan("123", "%hd%hd", &s, &s2));
+    ovs_assert(ovs_scan("+123", "%hd", &s));
+    ovs_assert(s == 123);
+    ovs_assert(ovs_scan("-123", "%hd", &s));
+    ovs_assert(s == -123);
+    ovs_assert(ovs_scan("0123", "%hd", &s));
+    ovs_assert(s == 123);
+    ovs_assert(ovs_scan(" 123", "%hd", &s));
+    ovs_assert(s == 123);
+    ovs_assert(ovs_scan("0x123", "%hd", &s));
+    ovs_assert(s == 0);
+    ovs_assert(ovs_scan("123", "%2hd %hd", &s, &s2));
+    ovs_assert(s == 12);
+    ovs_assert(s2 == 3);
+    ovs_assert(ovs_scan("+123", "%2hd %hd", &s, &s2));
+    ovs_assert(s == 1);
+    ovs_assert(s2 == 23);
+    ovs_assert(ovs_scan("-123", "%2hd %hd", &s, &s2));
+    ovs_assert(s == -1);
+    ovs_assert(s2 == 23);
+    ovs_assert(ovs_scan("0123", "%2hd %hd", &s, &s2));
+    ovs_assert(s == 1);
+    ovs_assert(s2 == 23);
+
+    ovs_assert(ovs_scan("123", "%hhd", &c));
+    ovs_assert(c == 123);
+    ovs_assert(ovs_scan("0", "%hhd", &c));
+    ovs_assert(c == 0);
+    ovs_assert(!ovs_scan("123", "%hhd%hhd", &c, &c2));
+    ovs_assert(ovs_scan("+123", "%hhd", &c));
+    ovs_assert(c == 123);
+    ovs_assert(ovs_scan("-123", "%hhd", &c));
+    ovs_assert(c == -123);
+    ovs_assert(ovs_scan("0123", "%hhd", &c));
+    ovs_assert(c == 123);
+    ovs_assert(ovs_scan(" 123", "%hhd", &c));
+    ovs_assert(c == 123);
+    ovs_assert(ovs_scan("0x123", "%hhd", &c));
+    ovs_assert(c == 0);
+    ovs_assert(ovs_scan("123", "%2hhd %hhd", &c, &c2));
+    ovs_assert(c == 12);
+    ovs_assert(c2 == 3);
+    ovs_assert(ovs_scan("+123", "%2hhd %hhd", &c, &c2));
+    ovs_assert(c == 1);
+    ovs_assert(c2 == 23);
+    ovs_assert(ovs_scan("-123", "%2hhd %hhd", &c, &c2));
+    ovs_assert(c == -1);
+    ovs_assert(c2 == 23);
+    ovs_assert(ovs_scan("0123", "%2hhd %hhd", &c, &c2));
+    ovs_assert(c == 1);
+    ovs_assert(c2 == 23);
+
+    ovs_assert(ovs_scan("123", "%ld", &l));
+    ovs_assert(l == 123);
+    ovs_assert(ovs_scan("0", "%ld", &l));
+    ovs_assert(l == 0);
+    ovs_assert(!ovs_scan("123", "%ld%ld", &l, &l2));
+    ovs_assert(ovs_scan("+123", "%ld", &l));
+    ovs_assert(l == 123);
+    ovs_assert(ovs_scan("-123", "%ld", &l));
+    ovs_assert(l == -123);
+    ovs_assert(ovs_scan("0123", "%ld", &l));
+    ovs_assert(l == 123);
+    ovs_assert(ovs_scan(" 123", "%ld", &l));
+    ovs_assert(l == 123);
+    ovs_assert(ovs_scan("0x123", "%ld", &l));
+    ovs_assert(l == 0);
+    ovs_assert(ovs_scan("123", "%2ld %ld", &l, &l2));
+    ovs_assert(l == 12);
+    ovs_assert(l2 == 3);
+    ovs_assert(ovs_scan("+123", "%2ld %ld", &l, &l2));
+    ovs_assert(l == 1);
+    ovs_assert(l2 == 23);
+    ovs_assert(ovs_scan("-123", "%2ld %ld", &l, &l2));
+    ovs_assert(l == -1);
+    ovs_assert(l2 == 23);
+    ovs_assert(ovs_scan("0123", "%2ld %ld", &l, &l2));
+    ovs_assert(l == 1);
+    ovs_assert(l2 == 23);
+
+    ovs_assert(ovs_scan("123", "%lld", &ll));
+    ovs_assert(ll == 123);
+    ovs_assert(ovs_scan("0", "%lld", &ll));
+    ovs_assert(ll == 0);
+    ovs_assert(!ovs_scan("123", "%lld%lld", &ll, &ll2));
+    ovs_assert(ovs_scan("+123", "%lld", &ll));
+    ovs_assert(ll == 123);
+    ovs_assert(ovs_scan("-123", "%lld", &ll));
+    ovs_assert(ll == -123);
+    ovs_assert(ovs_scan("0123", "%lld", &ll));
+    ovs_assert(ll == 123);
+    ovs_assert(ovs_scan(" 123", "%lld", &ll));
+    ovs_assert(ll == 123);
+    ovs_assert(ovs_scan("0x123", "%lld", &ll));
+    ovs_assert(ll == 0);
+    ovs_assert(ovs_scan("123", "%2lld %lld", &ll, &ll2));
+    ovs_assert(ll == 12);
+    ovs_assert(ll2 == 3);
+    ovs_assert(ovs_scan("+123", "%2lld %lld", &ll, &ll2));
+    ovs_assert(ll == 1);
+    ovs_assert(ll2 == 23);
+    ovs_assert(ovs_scan("-123", "%2lld %lld", &ll, &ll2));
+    ovs_assert(ll == -1);
+    ovs_assert(ll2 == 23);
+    ovs_assert(ovs_scan("0123", "%2lld %lld", &ll, &ll2));
+    ovs_assert(ll == 1);
+    ovs_assert(ll2 == 23);
+
+    ovs_assert(ovs_scan("123", "%jd", &im));
+    ovs_assert(im == 123);
+    ovs_assert(ovs_scan("0", "%jd", &im));
+    ovs_assert(im == 0);
+    ovs_assert(!ovs_scan("123", "%jd%jd", &im, &im2));
+    ovs_assert(ovs_scan("+123", "%jd", &im));
+    ovs_assert(im == 123);
+    ovs_assert(ovs_scan("-123", "%jd", &im));
+    ovs_assert(im == -123);
+    ovs_assert(ovs_scan("0123", "%jd", &im));
+    ovs_assert(im == 123);
+    ovs_assert(ovs_scan(" 123", "%jd", &im));
+    ovs_assert(im == 123);
+    ovs_assert(ovs_scan("0x123", "%jd", &im));
+    ovs_assert(im == 0);
+    ovs_assert(ovs_scan("123", "%2jd %jd", &im, &im2));
+    ovs_assert(im == 12);
+    ovs_assert(im2 == 3);
+    ovs_assert(ovs_scan("+123", "%2jd %jd", &im, &im2));
+    ovs_assert(im == 1);
+    ovs_assert(im2 == 23);
+    ovs_assert(ovs_scan("-123", "%2jd %jd", &im, &im2));
+    ovs_assert(im == -1);
+    ovs_assert(im2 == 23);
+    ovs_assert(ovs_scan("0123", "%2jd %jd", &im, &im2));
+    ovs_assert(im == 1);
+    ovs_assert(im2 == 23);
+
+    ovs_assert(ovs_scan("123", "%td", &pd));
+    ovs_assert(pd == 123);
+    ovs_assert(ovs_scan("0", "%td", &pd));
+    ovs_assert(pd == 0);
+    ovs_assert(!ovs_scan("123", "%td%td", &pd, &pd2));
+    ovs_assert(ovs_scan("+123", "%td", &pd));
+    ovs_assert(pd == 123);
+    ovs_assert(ovs_scan("-123", "%td", &pd));
+    ovs_assert(pd == -123);
+    ovs_assert(ovs_scan("0123", "%td", &pd));
+    ovs_assert(pd == 123);
+    ovs_assert(ovs_scan(" 123", "%td", &pd));
+    ovs_assert(pd == 123);
+    ovs_assert(ovs_scan("0x123", "%td", &pd));
+    ovs_assert(pd == 0);
+    ovs_assert(ovs_scan("123", "%2td %td", &pd, &pd2));
+    ovs_assert(pd == 12);
+    ovs_assert(pd2 == 3);
+    ovs_assert(ovs_scan("+123", "%2td %td", &pd, &pd2));
+    ovs_assert(pd == 1);
+    ovs_assert(pd2 == 23);
+    ovs_assert(ovs_scan("-123", "%2td %td", &pd, &pd2));
+    ovs_assert(pd == -1);
+    ovs_assert(pd2 == 23);
+    ovs_assert(ovs_scan("0123", "%2td %td", &pd, &pd2));
+    ovs_assert(pd == 1);
+    ovs_assert(pd2 == 23);
+
+    ovs_assert(ovs_scan("123", "%zd", &sz));
+    ovs_assert(sz == 123);
+    ovs_assert(ovs_scan("0", "%zd", &sz));
+    ovs_assert(sz == 0);
+    ovs_assert(!ovs_scan("123", "%zd%zd", &sz, &sz2));
+    ovs_assert(ovs_scan("+123", "%zd", &sz));
+    ovs_assert(sz == 123);
+    ovs_assert(ovs_scan("-123", "%zd", &sz));
+    ovs_assert(sz == -123);
+    ovs_assert(ovs_scan("0123", "%zd", &sz));
+    ovs_assert(sz == 123);
+    ovs_assert(ovs_scan(" 123", "%zd", &sz));
+    ovs_assert(sz == 123);
+    ovs_assert(ovs_scan("0x123", "%zd", &sz));
+    ovs_assert(sz == 0);
+    ovs_assert(ovs_scan("123", "%2zd %zd", &sz, &sz2));
+    ovs_assert(sz == 12);
+    ovs_assert(sz2 == 3);
+    ovs_assert(ovs_scan("+123", "%2zd %zd", &sz, &sz2));
+    ovs_assert(sz == 1);
+    ovs_assert(sz2 == 23);
+    ovs_assert(ovs_scan("-123", "%2zd %zd", &sz, &sz2));
+    ovs_assert(sz == -1);
+    ovs_assert(sz2 == 23);
+    ovs_assert(ovs_scan("0123", "%2zd %zd", &sz, &sz2));
+    ovs_assert(sz == 1);
+    ovs_assert(sz2 == 23);
+
+    ovs_assert(ovs_scan("0.25", "%f", &f));
+    ovs_assert(f == 0.25);
+    ovs_assert(ovs_scan("1.0", "%f", &f));
+    ovs_assert(f == 1.0);
+    ovs_assert(ovs_scan("-5", "%f", &f));
+    ovs_assert(f == -5.0);
+    ovs_assert(ovs_scan("+6", "%f", &f));
+    ovs_assert(f == 6.0);
+    ovs_assert(ovs_scan("-1e5", "%f", &f));
+    ovs_assert(f == -1e5);
+    ovs_assert(ovs_scan("-.25", "%f", &f));
+    ovs_assert(f == -.25);
+    ovs_assert(ovs_scan("+123.e1", "%f", &f));
+    ovs_assert(f == 1230.0);
+    ovs_assert(ovs_scan("25e-2", "%f", &f));
+    ovs_assert(f == 0.25);
+    ovs_assert(ovs_scan("0.25", "%1f %f", &f, &f2));
+    ovs_assert(f == 0);
+    ovs_assert(f2 == 0.25);
+    ovs_assert(ovs_scan("1.0", "%2f %f", &f, &f2));
+    ovs_assert(f == 1.0);
+    ovs_assert(f2 == 0.0);
+    ovs_assert(!ovs_scan("-5", "%1f", &f));
+    ovs_assert(!ovs_scan("+6", "%1f", &f));
+    ovs_assert(!ovs_scan("-1e5", "%2f %*f", &f));
+    ovs_assert(f == -1);
+    ovs_assert(!ovs_scan("-.25", "%2f", &f));
+    ovs_assert(!ovs_scan("+123.e1", "%6f", &f));
+    ovs_assert(!ovs_scan("25e-2", "%4f", &f));
+
+    ovs_assert(ovs_scan("0.25", "%lf", &d));
+    ovs_assert(d == 0.25);
+    ovs_assert(ovs_scan("1.0", "%lf", &d));
+    ovs_assert(d == 1.0);
+    ovs_assert(ovs_scan("-5", "%lf", &d));
+    ovs_assert(d == -5.0);
+    ovs_assert(ovs_scan("+6", "%lf", &d));
+    ovs_assert(d == 6.0);
+    ovs_assert(ovs_scan("-1e5", "%lf", &d));
+    ovs_assert(d == -1e5);
+    ovs_assert(ovs_scan("-.25", "%lf", &d));
+    ovs_assert(d == -.25);
+    ovs_assert(ovs_scan("+123.e1", "%lf", &d));
+    ovs_assert(d == 1230.0);
+    ovs_assert(ovs_scan("25e-2", "%lf", &d));
+    ovs_assert(d == 0.25);
+    ovs_assert(ovs_scan("0.25", "%1lf %lf", &d, &d2));
+    ovs_assert(d == 0);
+    ovs_assert(d2 == 0.25);
+    ovs_assert(ovs_scan("1.0", "%2lf %lf", &d, &d2));
+    ovs_assert(d == 1.0);
+    ovs_assert(d2 == 0.0);
+    ovs_assert(!ovs_scan("-5", "%1lf", &d));
+    ovs_assert(!ovs_scan("+6", "%1lf", &d));
+    ovs_assert(!ovs_scan("-1e5", "%2lf %*f", &d));
+    ovs_assert(d == -1);
+    ovs_assert(!ovs_scan("-.25", "%2lf", &d));
+    ovs_assert(!ovs_scan("+123.e1", "%6lf", &d));
+    ovs_assert(!ovs_scan("25e-2", "%4lf", &d));
+
+    ovs_assert(ovs_scan("0.25", "%Lf", &ld));
+    ovs_assert(ld == 0.25);
+    ovs_assert(ovs_scan("1.0", "%Lf", &ld));
+    ovs_assert(ld == 1.0);
+    ovs_assert(ovs_scan("-5", "%Lf", &ld));
+    ovs_assert(ld == -5.0);
+    ovs_assert(ovs_scan("+6", "%Lf", &ld));
+    ovs_assert(ld == 6.0);
+    ovs_assert(ovs_scan("-1e5", "%Lf", &ld));
+    ovs_assert(ld == -1e5);
+    ovs_assert(ovs_scan("-.25", "%Lf", &ld));
+    ovs_assert(ld == -.25);
+    ovs_assert(ovs_scan("+123.e1", "%Lf", &ld));
+    ovs_assert(ld == 1230.0);
+    ovs_assert(ovs_scan("25e-2", "%Lf", &ld));
+    ovs_assert(ld == 0.25);
+    ovs_assert(ovs_scan("0.25", "%1Lf %Lf", &ld, &ld2));
+    ovs_assert(ld == 0);
+    ovs_assert(ld2 == 0.25);
+    ovs_assert(ovs_scan("1.0", "%2Lf %Lf", &ld, &ld2));
+    ovs_assert(ld == 1.0);
+    ovs_assert(ld2 == 0.0);
+    ovs_assert(!ovs_scan("-5", "%1Lf", &ld));
+    ovs_assert(!ovs_scan("+6", "%1Lf", &ld));
+    ovs_assert(!ovs_scan("-1e5", "%2Lf %*f", &ld));
+    ovs_assert(ld == -1);
+    ovs_assert(!ovs_scan("-.25", "%2Lf", &ld));
+    ovs_assert(!ovs_scan("+123.e1", "%6Lf", &ld));
+    ovs_assert(!ovs_scan("25e-2", "%4Lf", &ld));
+
+    ovs_assert(ovs_scan(" Hello,\tworld ", "%*s%n%*s%n", &n, &n2));
+    ovs_assert(n == 7);
+    ovs_assert(n2 == 13);
+    ovs_assert(!ovs_scan(" Hello,\tworld ", "%*s%*s%*s"));
+    ovs_assert(ovs_scan(" Hello,\tworld ", "%6s%n%5s%n", str, &n, str2, &n2));
+    ovs_assert(!strcmp(str, "Hello,"));
+    ovs_assert(n == 7);
+    ovs_assert(!strcmp(str2, "world"));
+    ovs_assert(n2 == 13);
+    ovs_assert(ovs_scan(" Hello,\tworld ", "%5s%5s%5s", str, str2, str3));
+    ovs_assert(!strcmp(str, "Hello"));
+    ovs_assert(!strcmp(str2, ","));
+    ovs_assert(!strcmp(str3, "world"));
+    ovs_assert(!ovs_scan(" ", "%*s"));
+
+    ovs_assert(ovs_scan(" Hello,\tworld ", "%*c%n%*c%n%c%n",
+                        &n, &n2, &c, &n3));
+    ovs_assert(n == 1);
+    ovs_assert(n2 == 2);
+    ovs_assert(c == 'e');
+    ovs_assert(n3 == 3);
+    ovs_assert(ovs_scan(" Hello,\tworld ", "%*5c%5c", str));
+    ovs_assert(!memcmp(str, "o,\two", 5));
+    ovs_assert(!ovs_scan(" Hello,\tworld ", "%*15c"));
+
+    ovs_assert(ovs_scan("0x1234xyzzy", "%9[x0-9a-fA-F]%n", str, &n));
+    ovs_assert(!strcmp(str, "0x1234x"));
+    ovs_assert(n == 7);
+    ovs_assert(ovs_scan("foo:bar=baz", "%5[^:=]%n:%5[^:=]%n=%5[^:=]%n",
+                        str, &n, str2, &n2, str3, &n3));
+    ovs_assert(!strcmp(str, "foo"));
+    ovs_assert(n == 3);
+    ovs_assert(!strcmp(str2, "bar"));
+    ovs_assert(n2 == 7);
+    ovs_assert(!strcmp(str3, "baz"));
+    ovs_assert(n3 == 11);
+    ovs_assert(!ovs_scan(" ", "%*[0-9]"));
+    ovs_assert(ovs_scan("0x123a]4xyzzy-", "%[]x0-9a-fA-F]", str));
+    ovs_assert(!strcmp(str, "0x123a]4x"));
+    ovs_assert(ovs_scan("abc]xyz","%[^]xyz]", str));
+    ovs_assert(!strcmp(str, "abc"));
+    ovs_assert(!ovs_scan("0x123a]4xyzzy-", "%[x0-9]a-fA-F]", str));
+    ovs_assert(ovs_scan("0x12-3]xyz", "%[x0-9a-f-]", str));
+    ovs_assert(!strcmp(str, "0x12-3"));
+    ovs_assert(ovs_scan("0x12-3]xyz", "%[^a-f-]", str));
+    ovs_assert(!strcmp(str, "0x12"));
+    ovs_assert(sscanf("0x12-3]xyz", "%[^-a-f]", str));
+    ovs_assert(!strcmp(str, "0x12"));
+}
+
+static void
+test_snprintf(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
+{
+    char s[16];
+
+    ovs_assert(snprintf(s, 4, "abcde") == 5);
+    ovs_assert(!strcmp(s, "abc"));
+
+    ovs_assert(snprintf(s, 5, "abcde") == 5);
+    ovs_assert(!strcmp(s, "abcd"));
+
+    ovs_assert(snprintf(s, 6, "abcde") == 5);
+    ovs_assert(!strcmp(s, "abcde"));
+
+    ovs_assert(snprintf(NULL, 0, "abcde") == 5);
+}
+
+static const struct command commands[] = {
+    {"ctz", 0, 0, test_ctz},
+    {"clz", 0, 0, test_clz},
+    {"round_up_pow2", 0, 0, test_round_up_pow2},
+    {"round_down_pow2", 0, 0, test_round_down_pow2},
+    {"count_1bits", 0, 0, test_count_1bits},
+    {"log_2_floor", 0, 0, test_log_2_floor},
+    {"bitwise_copy", 0, 0, test_bitwise_copy},
+    {"bitwise_zero", 0, 0, test_bitwise_zero},
+    {"bitwise_one", 0, 0, test_bitwise_one},
+    {"bitwise_is_all_zeros", 0, 0, test_bitwise_is_all_zeros},
+    {"follow-symlinks", 1, INT_MAX, test_follow_symlinks},
+    {"assert", 0, 0, test_assert},
+    {"ovs_scan", 0, 0, test_ovs_scan},
+    {"snprintf", 0, 0, test_snprintf},
+    {NULL, 0, 0, NULL},
+};
+
+static void
+parse_options(int argc, char *argv[])
+{
+    enum {
+        VLOG_OPTION_ENUMS
+    };
+    static const struct option long_options[] = {
+        VLOG_LONG_OPTIONS,
+        {NULL, 0, NULL, 0},
+    };
+    char *short_options = long_options_to_short_options(long_options);
+
+    for (;;) {
+        int c = getopt_long(argc, argv, short_options, long_options, NULL);
+        if (c == -1) {
+            break;
+        }
+
+        switch (c) {
+        VLOG_OPTION_HANDLERS
+
+        case '?':
+            exit(EXIT_FAILURE);
+
+        default:
+            abort();
+        }
+    }
+    free(short_options);
+}
+
+static void
+test_util_main(int argc, char *argv[])
+{
+    set_program_name(argv[0]);
+    parse_options(argc, argv);
+    run_command(argc - optind, argv + optind, commands);
+}
+
+OVSTEST_REGISTER("test-util", test_util_main);