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Re: [PATCH 1/2] util/cutils: Turn FIXME comment into QEMU_BUILD_BUG_ON()


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH 1/2] util/cutils: Turn FIXME comment into QEMU_BUILD_BUG_ON()
Date: Mon, 25 Nov 2019 15:17:55 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1

On 11/25/19 2:38 PM, Markus Armbruster wrote:
qemu_strtoi64() assumes int64_t is long long.  This is marked FIXME.
Replace by a QEMU_BUILD_BUG_ON() to avoid surprises.

Same for qemu_strtou64().

Fix a typo in qemu_strtoul()'s contract while there.

Signed-off-by: Markus Armbruster <address@hidden>
---
  util/cutils.c | 8 +++++---
  1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/util/cutils.c b/util/cutils.c
index fd591cadf0..b372dd3e68 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -502,7 +502,7 @@ int qemu_strtoul(const char *nptr, const char **endptr, int 
base,
   * Convert string @nptr to an int64_t.
   *
   * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
- * and INT_MIN on underflow.
+ * and INT64_MIN on underflow.
   */
  int qemu_strtoi64(const char *nptr, const char **endptr, int base,
                   int64_t *result)
@@ -517,8 +517,9 @@ int qemu_strtoi64(const char *nptr, const char **endptr, 
int base,
          return -EINVAL;
      }
+ /* This assumes int64_t is long long TODO relax */
+    QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));

Ready for 128-bit!
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

      errno = 0;
-    /* FIXME This assumes int64_t is long long */
      *result = strtoll(nptr, &ep, base);
      return check_strtox_error(nptr, ep, endptr, errno);
  }
@@ -541,8 +542,9 @@ int qemu_strtou64(const char *nptr, const char **endptr, 
int base,
          return -EINVAL;
      }
+ /* This assumes uint64_t is unsigned long long TODO relax */
+    QEMU_BUILD_BUG_ON(sizeof(uint64_t) != sizeof(unsigned long long));
      errno = 0;
-    /* FIXME This assumes uint64_t is unsigned long long */
      *result = strtoull(nptr, &ep, base);
      /* Windows returns 1 for negative out-of-range values.  */
      if (errno == ERANGE) {





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