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util/cutils: Let qemu_strtosz*() optionally reject trailing crap

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Change the qemu_strtosz() & friends to return -EINVAL when @endptr is
null and the conversion doesn't consume the string completely.
Matches how qemu_strtol() & friends work.

Only test_qemu_strtosz_simple() passes a null @endptr.  No functional
change there, because its conversion consumes the string.

Simplify callers that use @endptr only to fail when it doesn't point
to '\0' to pass a null @endptr instead.

Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com> (maintainer:X86)
Cc: Kevin Wolf <kwolf@redhat.com> (supporter:Block layer core)
Cc: Max Reitz <mreitz@redhat.com> (supporter:Block layer core)
Cc: qemu-block@nongnu.org (open list:Block layer core)
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <1487708048-2131-22-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2017-02-21 21:14:05 +01:00
parent 606caa0a2a
commit 4fcdf65ae2
8 changed files with 25 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

14
util/cutils.c
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@ -208,7 +208,7 @@ static int64_t suffix_mul(char suffix, int64_t unit)
static int64_t do_strtosz(const char *nptr, char **end,
const char default_suffix, int64_t unit)
{
int64_t retval = -EINVAL;
int64_t retval;
char *endptr;
unsigned char c;
int mul_required = 0;
@ -217,7 +217,8 @@ static int64_t do_strtosz(const char *nptr, char **end,
errno = 0;
val = strtod(nptr, &endptr);
if (isnan(val) || endptr == nptr || errno != 0) {
goto fail;
retval = -EINVAL;
goto out;
}
fraction = modf(val, &integral);
if (fraction != 0) {
@ -232,17 +233,20 @@ static int64_t do_strtosz(const char *nptr, char **end,
assert(mul >= 0);
}
if (mul == 1 && mul_required) {
goto fail;
retval = -EINVAL;
goto out;
}
if ((val * mul >= INT64_MAX) || val < 0) {
retval = -ERANGE;
goto fail;
goto out;
}
retval = val * mul;
fail:
out:
if (end) {
*end = endptr;
} else if (*endptr) {
retval = -EINVAL;
}
return retval;