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rtsp/wpas: pass va_list by reference

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As it turns out, the C standard forbids passing va_list by value and then
continue using it in the parent function (C Standard, 7.16, paragraph 3).

Luckily, there's a footnote stating:
    "It is permitted to create a pointer to a va_list and pass that
    pointer to another function, in which case the original function may
    take further use of the original list after the other function
    returns."

Therefore, we're safe passing va_list by reference and thus can keep the
current coding style.

This fixes weird bugs on ARM32 which really doesn't allow passing va_list
by value.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann 2014-08-05 13:10:03 +02:00
parent 9196c5c426
commit 67de17a511
4 changed files with 33 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/shared/wpas.c
View file

@ -374,7 +374,7 @@ int wpas_message_append_basic(struct wpas_message *m, char type, ...)
int r;
va_start(args, type);
r = wpas_message_appendv_basic(m, type, args);
r = wpas_message_appendv_basic(m, type, &args);
va_end(args);
return r;
@ -382,7 +382,7 @@ int wpas_message_append_basic(struct wpas_message *m, char type, ...)
int wpas_message_appendv_basic(struct wpas_message *m,
char type,
va_list args)
va_list *args)
{
_shl_free_ char *str = NULL;
char buf[128] = { };
@ -401,27 +401,27 @@ int wpas_message_appendv_basic(struct wpas_message *m,
switch (type) {
case WPAS_TYPE_STRING:
orig = va_arg(args, const char*);
orig = va_arg(*args, const char*);
if (!orig)
return -EINVAL;
break;
case WPAS_TYPE_INT32:
i32 = va_arg(args, int32_t);
i32 = va_arg(*args, int32_t);
sprintf(buf, "%" PRId32, i32);
orig = buf;
break;
case WPAS_TYPE_UINT32:
u32 = va_arg(args, uint32_t);
u32 = va_arg(*args, uint32_t);
sprintf(buf, "%" PRIu32, u32);
orig = buf;
break;
case WPAS_TYPE_DICT:
s = va_arg(args, const char*);
s = va_arg(*args, const char*);
if (!s)
return -EINVAL;
t = va_arg(args, const char*);
t = va_arg(*args, const char*);
if (!t)
return -EINVAL;
@ -451,7 +451,7 @@ int wpas_message_append(struct wpas_message *m, const char *types, ...)
int r;
va_start(args, types);
r = wpas_message_appendv(m, types, args);
r = wpas_message_appendv(m, types, &args);
va_end(args);
return r;
@ -459,7 +459,7 @@ int wpas_message_append(struct wpas_message *m, const char *types, ...)
int wpas_message_appendv(struct wpas_message *m,
const char *types,
va_list args)
va_list *args)
{
int r;