From: Richard Henderson <rth@redhat.com>
To: Bruce Korb <bruce.korb@gmail.com>
Cc: libffi-discuss@sourceware.org
Subject: Re: pass by value and also snprintf()
Date: Mon, 27 Apr 2015 18:02:00 -0000 [thread overview]
Message-ID: <553E7994.5040303@redhat.com> (raw)
In-Reply-To: <CAKRnqNJtEj_VvXNrF=QXteJAwAYmKZ3K1PAxtb35hY43Nr0ezw@mail.gmail.com>
On 04/27/2015 10:37 AM, Bruce Korb wrote:
> int
> main(int argc, char ** argv)
> {
> char buffer[0x1000];
> size_t bufsz = sizeof(buffer);
> char const fmt[] = "Allocated sblock_id=%d for band_id=%d\n";
> int32_t sblock = 1;
> int32_t band = 1;
> void * fn = sprintf;
...
> void * values[5] = {
> [0] = buffer,
> [1] = &bufsz,
> [2] = UCONST(fmt),
> [3] = &sblock,
> [4] = &band };
That would be because you're passing buffer and fmt instead of a pointer to
buffer and fmt. You need to do
char * buffer_p = buffer;
const char *fmt_p = fmt;
void * values[5] = {
[0] = &buffer_p,
[1] = &bufsz,
[2] = &fmt_p,
[3] = &sblock,
[4] = &band };
One of the many peculiarities of the libffi api...
r~
next prev parent reply other threads:[~2015-04-27 18:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-27 16:59 Bruce Korb
2015-04-27 17:09 ` Richard Henderson
2015-04-27 17:37 ` Bruce Korb
2015-04-27 17:45 ` Bruce Korb
2015-04-27 17:48 ` Bruce Korb
2015-04-27 18:02 ` Richard Henderson [this message]
2015-04-27 18:54 ` Bruce Korb
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