[PATCH 0/2] More qemu_strtosz fixes

[PATCH 0/2] More qemu_strtosz fixes

[Eric Blake]

The MSYS2 build exposed a latent problem in qemu_strto*l, which in
turn now causes failures ever since test-utils added tests for
qemu_strtosz that depends on a particular behavior when parsing "0x".

https://cirrus-ci.com/task/5180846782021632?command=test#L543

Eric Blake (2):
  utils: Tighter tests for qemu_strtosz
  utils: Work around mingw strto*l bug with 0x

 tests/unit/test-cutils.c | 171 +++++++++++++++++++++++++++++++++++++--
 util/cutils.c            |  33 +++++---
 2 files changed, 189 insertions(+), 15 deletions(-)

-- 
2.30.2

[PATCH 1/2] utils: Tighter tests for qemu_strtosz

[Eric Blake]

Our tests were not validating the return value in all cases, nor was
it guaranteeing our documented claim that 'res' is unchanged on error.
For that matter, it wasn't as thorough as the existing tests for
qemu_strtoi() and friends for proving that endptr and res are sanely
set.  Enhancing the test found one case where we violated our
documentation: namely, when failing with EINVAL when endptr is NULL,
we shouldn't modify res.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 tests/unit/test-cutils.c | 117 +++++++++++++++++++++++++++++++++++++--
 util/cutils.c            |   4 +-
 2 files changed, 114 insertions(+), 7 deletions(-)

diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index e025b54c0514..5908de4fd041 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -1952,9 +1952,11 @@ static void test_qemu_strtosz_simple(void)
     const char *str;
     const char *endptr;
     int err;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     str = "0";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0);
@@ -1962,6 +1964,8 @@ static void test_qemu_strtosz_simple(void)

     /* Leading 0 gives decimal results, not octal */
     str = "08";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 8);
@@ -1969,46 +1973,61 @@ static void test_qemu_strtosz_simple(void)

     /* Leading space is ignored */
     str = " 12345";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345);
     g_assert(endptr == str + 6);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345);

     str = "9007199254740991"; /* 2^53-1 */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x1fffffffffffff);
     g_assert(endptr == str + 16);

     str = "9007199254740992"; /* 2^53 */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x20000000000000);
     g_assert(endptr == str + 16);

     str = "9007199254740993"; /* 2^53+1 */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x20000000000001);
     g_assert(endptr == str + 16);

     str = "18446744073709549568"; /* 0xfffffffffffff800 (53 msbs set) */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0xfffffffffffff800);
     g_assert(endptr == str + 20);

     str = "18446744073709550591"; /* 0xfffffffffffffbff */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0xfffffffffffffbff);
     g_assert(endptr == str + 20);

     str = "18446744073709551615"; /* 0xffffffffffffffff */
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0xffffffffffffffff);
@@ -2020,21 +2039,27 @@ static void test_qemu_strtosz_hex(void)
     const char *str;
     const char *endptr;
     int err;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     str = "0x0";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0);
     g_assert(endptr == str + 3);

     str = "0xab";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 171);
     g_assert(endptr == str + 4);

     str = "0xae";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 174);
@@ -2053,44 +2078,60 @@ static void test_qemu_strtosz_units(void)
     const char *e = "1E";
     int err;
     const char *endptr;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     /* default is M */
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz_MiB(none, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, MiB);
     g_assert(endptr == none + 1);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(b, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 1);
     g_assert(endptr == b + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(k, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, KiB);
     g_assert(endptr == k + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(m, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, MiB);
     g_assert(endptr == m + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(g, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, GiB);
     g_assert(endptr == g + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(t, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, TiB);
     g_assert(endptr == t + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(p, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, PiB);
     g_assert(endptr == p + 2);

+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(e, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, EiB);
@@ -2102,9 +2143,11 @@ static void test_qemu_strtosz_float(void)
     const char *str;
     int err;
     const char *endptr;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     str = "0.5E";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, EiB / 2);
@@ -2112,6 +2155,8 @@ static void test_qemu_strtosz_float(void)

     /* For convenience, a fraction of 0 is tolerated even on bytes */
     str = "1.0B";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 1);
@@ -2119,6 +2164,8 @@ static void test_qemu_strtosz_float(void)

     /* An empty fraction is tolerated */
     str = "1.k";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 1024);
@@ -2126,6 +2173,8 @@ static void test_qemu_strtosz_float(void)

     /* For convenience, we permit values that are not byte-exact */
     str = "12.345M";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, (uint64_t) (12.345 * MiB + 0.5));
@@ -2140,67 +2189,91 @@ static void test_qemu_strtosz_invalid(void)
     uint64_t res = 0xbaadf00d;

     str = "";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = " \t ";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "crap";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "inf";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "NaN";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     /* Fractional values require scale larger than bytes */
     str = "1.1B";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "1.1";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     /* No floating point exponents */
     str = "1.5e1k";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "1.5E+0k";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     /* No hex fractions */
     str = "0x1.8k";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     /* No negative values */
     str = "-0";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);

     str = "-1";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str);
 }

@@ -2209,48 +2282,72 @@ static void test_qemu_strtosz_trailing(void)
     const char *str;
     const char *endptr;
     int err;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     str = "123xxx";
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz_MiB(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123 * MiB);
     g_assert(endptr == str + 3);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);

     str = "1kiB";
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 1024);
     g_assert(endptr == str + 2);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);

     str = "0x";
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0);
     g_assert(endptr == str + 1);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);

     str = "0.NaN";
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0);
     g_assert(endptr == str + 2);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);

     str = "123-45";
+    endptr = NULL;
+    res = 0xbaadf00d;
     err = qemu_strtosz(str, &endptr, &res);
+    g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 123);
     g_assert(endptr == str + 3);

+    res = 0xbaadf00d;
     err = qemu_strtosz(str, NULL, &res);
     g_assert_cmpint(err, ==, -EINVAL);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
 }

 static void test_qemu_strtosz_erange(void)
@@ -2261,13 +2358,17 @@ static void test_qemu_strtosz_erange(void)
     uint64_t res = 0xbaadf00d;

     str = "18446744073709551616"; /* 2^64; see strtosz_simple for 2^64-1 */
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -ERANGE);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str + 20);

     str = "20E";
+    endptr = NULL;
     err = qemu_strtosz(str, &endptr, &res);
     g_assert_cmpint(err, ==, -ERANGE);
+    g_assert_cmpint(res, ==, 0xbaadf00d);
     g_assert(endptr == str + 3);
 }

@@ -2276,15 +2377,19 @@ static void test_qemu_strtosz_metric(void)
     const char *str;
     int err;
     const char *endptr;
-    uint64_t res = 0xbaadf00d;
+    uint64_t res;

     str = "12345k";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz_metric(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345000);
     g_assert(endptr == str + 6);

     str = "12.345M";
+    endptr = str;
+    res = 0xbaadf00d;
     err = qemu_strtosz_metric(str, &endptr, &res);
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 12345000);
diff --git a/util/cutils.c b/util/cutils.c
index c442882b88d5..b425ed6570c3 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -362,7 +362,6 @@ static int do_strtosz(const char *nptr, const char **end,
         }
     }

-    *result = val;
     retval = 0;

 out:
@@ -371,6 +370,9 @@ out:
     } else if (*endptr) {
         retval = -EINVAL;
     }
+    if (retval == 0) {
+        *result = val;
+    }

     return retval;
 }
-- 
2.30.2

Re: [PATCH 1/2] utils: Tighter tests for qemu_strtosz

[Thomas Huth]

On 17/03/2021 15.33, Eric Blake wrote:
> Our tests were not validating the return value in all cases, nor was
> it guaranteeing our documented claim that 'res' is unchanged on error.
> For that matter, it wasn't as thorough as the existing tests for
> qemu_strtoi() and friends for proving that endptr and res are sanely
> set.  Enhancing the test found one case where we violated our
> documentation: namely, when failing with EINVAL when endptr is NULL,
> we shouldn't modify res.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>   tests/unit/test-cutils.c | 117 +++++++++++++++++++++++++++++++++++++--
>   util/cutils.c            |   4 +-
>   2 files changed, 114 insertions(+), 7 deletions(-)

Reviewed-by: Thomas Huth <thuth@redhat.com>

[PATCH 2/2] utils: Work around mingw strto*l bug with 0x

[Eric Blake]

Mingw recognizes that "0x" has value 0 without setting errno, but
fails to advance endptr to the trailing garbage 'x'.  This in turn
showed up in our recent testsuite additions for qemu_strtosz (commit
1657ba44b4 utils: Enhance testsuite for do_strtosz()); adjust our
remaining tests to show that we now work around this windows bug.

This patch intentionally fails check-syntax for use of strtol.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 tests/unit/test-cutils.c | 54 ++++++++++++++++++++++++++++++++++++++++
 util/cutils.c            | 29 +++++++++++++++------
 2 files changed, 75 insertions(+), 8 deletions(-)

diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index 5908de4fd041..98671f1ac30e 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -378,6 +378,15 @@ static void test_qemu_strtoi_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    res = 999;
+    endptr = &f;
+    err = qemu_strtoi(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtoi_max(void)
@@ -669,6 +678,15 @@ static void test_qemu_strtoui_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    res = 999;
+    endptr = &f;
+    err = qemu_strtoui(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmphex(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtoui_max(void)
@@ -955,6 +973,15 @@ static void test_qemu_strtol_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    res = 999;
+    endptr = &f;
+    err = qemu_strtol(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtol_max(void)
@@ -1244,6 +1271,15 @@ static void test_qemu_strtoul_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    res = 999;
+    endptr = &f;
+    err = qemu_strtoul(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmphex(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtoul_max(void)
@@ -1528,6 +1564,15 @@ static void test_qemu_strtoi64_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmpint(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    endptr = &f;
+    res = 999;
+    err = qemu_strtoi64(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmpint(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtoi64_max(void)
@@ -1815,6 +1860,15 @@ static void test_qemu_strtou64_hex(void)
     g_assert_cmpint(err, ==, 0);
     g_assert_cmphex(res, ==, 0x123);
     g_assert(endptr == str + strlen(str));
+
+    str = "0x";
+    endptr = &f;
+    res = 999;
+    err = qemu_strtou64(str, &endptr, 16, &res);
+
+    g_assert_cmpint(err, ==, 0);
+    g_assert_cmphex(res, ==, 0);
+    g_assert(endptr == str + 1);
 }

 static void test_qemu_strtou64_max(void)
diff --git a/util/cutils.c b/util/cutils.c
index b425ed6570c3..ee908486da44 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -396,9 +396,22 @@ int qemu_strtosz_metric(const char *nptr, const char **end, uint64_t *result)
  * Helper function for error checking after strtol() and the like
  */
 static int check_strtox_error(const char *nptr, char *ep,
-                              const char **endptr, int libc_errno)
+                              const char **endptr, bool check_zero,
+                              int libc_errno)
 {
     assert(ep >= nptr);
+
+    /* Windows has a bug in that it fails to parse 0 from "0x" in base 16 */
+    if (check_zero && ep == nptr && libc_errno == 0) {
+        char *tmp;
+
+        errno = 0;
+        if (strtol(nptr, &tmp, 10) == 0 && errno == 0 &&
+            (*tmp == 'x' || *tmp == 'X')) {
+            ep = tmp;
+        }
+    }
+
     if (endptr) {
         *endptr = ep;
     }
@@ -465,7 +478,7 @@ int qemu_strtoi(const char *nptr, const char **endptr, int base,
     } else {
         *result = lresult;
     }
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, lresult == 0, errno);
 }

 /**
@@ -524,7 +537,7 @@ int qemu_strtoui(const char *nptr, const char **endptr, int base,
             *result = lresult;
         }
     }
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, lresult == 0, errno);
 }

 /**
@@ -566,7 +579,7 @@ int qemu_strtol(const char *nptr, const char **endptr, int base,

     errno = 0;
     *result = strtol(nptr, &ep, base);
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
 }

 /**
@@ -613,7 +626,7 @@ int qemu_strtoul(const char *nptr, const char **endptr, int base,
     if (errno == ERANGE) {
         *result = -1;
     }
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
 }

 /**
@@ -639,7 +652,7 @@ int qemu_strtoi64(const char *nptr, const char **endptr, int base,
     QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));
     errno = 0;
     *result = strtoll(nptr, &ep, base);
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
 }

 /**
@@ -668,7 +681,7 @@ int qemu_strtou64(const char *nptr, const char **endptr, int base,
     if (errno == ERANGE) {
         *result = -1;
     }
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
 }

 /**
@@ -708,7 +721,7 @@ int qemu_strtod(const char *nptr, const char **endptr, double *result)

     errno = 0;
     *result = strtod(nptr, &ep);
-    return check_strtox_error(nptr, ep, endptr, errno);
+    return check_strtox_error(nptr, ep, endptr, false, errno);
 }

 /**
-- 
2.30.2

Re: [PATCH 2/2] utils: Work around mingw strto*l bug with 0x

[Thomas Huth]

On 17/03/2021 15.33, Eric Blake wrote:
> Mingw recognizes that "0x" has value 0 without setting errno, but
> fails to advance endptr to the trailing garbage 'x'.  This in turn
> showed up in our recent testsuite additions for qemu_strtosz (commit
> 1657ba44b4 utils: Enhance testsuite for do_strtosz()); adjust our
> remaining tests to show that we now work around this windows bug.
> 
> This patch intentionally fails check-syntax for use of strtol.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---
>   tests/unit/test-cutils.c | 54 ++++++++++++++++++++++++++++++++++++++++
>   util/cutils.c            | 29 +++++++++++++++------
>   2 files changed, 75 insertions(+), 8 deletions(-)

Reviewed-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH 0/2] More qemu_strtosz fixes

[no-reply]

Patchew URL: https://patchew.org/QEMU/20210317143325.2165821-1-eblake@redhat.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 20210317143325.2165821-1-eblake@redhat.com
Subject: [PATCH 0/2] More qemu_strtosz fixes

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
   5d1428d..25a7751  master     -> master
 - [tag update]      patchew/20210315230838.2973103-1-f4bug@amsat.org -> patchew/20210315230838.2973103-1-f4bug@amsat.org
 - [tag update]      patchew/20210315233527.2988483-1-philmd@redhat.com -> patchew/20210315233527.2988483-1-philmd@redhat.com
 - [tag update]      patchew/20210316220735.2048137-1-richard.henderson@linaro.org -> patchew/20210316220735.2048137-1-richard.henderson@linaro.org
 * [new tag]         patchew/20210317143325.2165821-1-eblake@redhat.com -> patchew/20210317143325.2165821-1-eblake@redhat.com
Switched to a new branch 'test'
36c9a8f utils: Work around mingw strto*l bug with 0x
81af63e utils: Tighter tests for qemu_strtosz

=== OUTPUT BEGIN ===
1/2 Checking commit 81af63e53841 (utils: Tighter tests for qemu_strtosz)
2/2 Checking commit 36c9a8f42010 (utils: Work around mingw strto*l bug with 0x)
ERROR: consider using qemu_strtol in preference to strtol
#141: FILE: util/cutils.c:409:
+        if (strtol(nptr, &tmp, 10) == 0 && errno == 0 &&

total: 1 errors, 0 warnings, 169 lines checked

Patch 2/2 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20210317143325.2165821-1-eblake@redhat.com/testing.checkpatch/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

Re: [PATCH 0/2] More qemu_strtosz fixes

[Eric Blake]

On 3/17/21 10:15 AM, no-reply@patchew.org wrote:
> Patchew URL: https://patchew.org/QEMU/20210317143325.2165821-1-eblake@redhat.com/
> 

> === OUTPUT BEGIN ===
> 1/2 Checking commit 81af63e53841 (utils: Tighter tests for qemu_strtosz)
> 2/2 Checking commit 36c9a8f42010 (utils: Work around mingw strto*l bug with 0x)
> ERROR: consider using qemu_strtol in preference to strtol
> #141: FILE: util/cutils.c:409:
> +        if (strtol(nptr, &tmp, 10) == 0 && errno == 0 &&
> 
> total: 1 errors, 0 warnings, 169 lines checked
> 

Intentional. This code is part of the implementation of qemu_strtol, and
we don't want infinite recursion ;)

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

Re: [PATCH 0/2] More qemu_strtosz fixes

[Alex Bennée]

Eric Blake <eblake@redhat.com> writes:

> The MSYS2 build exposed a latent problem in qemu_strto*l, which in
> turn now causes failures ever since test-utils added tests for
> qemu_strtosz that depends on a particular behavior when parsing "0x".
>
> https://cirrus-ci.com/task/5180846782021632?command=test#L543
>
> Eric Blake (2):
>   utils: Tighter tests for qemu_strtosz
>   utils: Work around mingw strto*l bug with 0x
>
>  tests/unit/test-cutils.c | 171 +++++++++++++++++++++++++++++++++++++--
>  util/cutils.c            |  33 +++++---
>  2 files changed, 189 insertions(+), 15 deletions(-)

Queued to for-6.0/fixes-for-rc1, thanks.

-- 
Alex Bennée