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Write custom typemap for aa_splitcon

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Can't use %cstring_mutable because aa_splitcon also returns a ptr

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
This commit is contained in:
Ryan Lee
2024-09-17 14:12:18 -07:00
parent f05112b5e9
commit 04da4c86b0
1 changed files with 38 additions and 3 deletions
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41
libraries/libapparmor/swig/SWIG/libapparmor.i
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@@ -100,10 +100,45 @@ warnings.warn("free_record is now a no-op as the record's memory is handled auto
}
/*
* mode is also an out pointer, but it points into an existing buffer.
* This is a catch-all for occurrences of **mode that aren't paired with **label.
* mode also occurs in combination with con in aa_splitcon
* typemap based on %cstring_mutable but with substantial modifications
*/
%cstring_output_allocate(char **mode, );
%typemap(in,numinputs=1,fragment="SWIG_AsCharPtrAndSize") (char *con, char **mode) ($*2_ltype temp_mode = 0) {
int alloc_status = 0;
$1_ltype con_ptr = NULL;
size_t con_len = 0;
int char_ptr_res = SWIG_AsCharPtrAndSize($input, &con_ptr, &con_len, &alloc_status);
if (!SWIG_IsOK(char_ptr_res)) {
%argument_fail(char_ptr_res, "char *con", $symname, $argnum);
}
if (alloc_status != SWIG_NEWOBJ) {
// Unconditionally copy because the C function modifies the string in place
$1 = %new_copy_array(con_ptr, con_len+1, char);
} else {
$1 = con_ptr;
}
$2 = &temp_mode;
}
%typemap(freearg,noblock=1,match="in") (char *con, char **mode) {
%delete_array($1);
}
%typemap(argout,noblock=1,fragment="SWIG_FromCharPtr") (char *con, char **mode) {
/*
* aa_splitcon returns either con or NULL so we don't need to explicitly
* append it to the output
*
* SWIG_FromCharPtr does NULL checks for us
*/
%append_output(SWIG_FromCharPtr(*$2));
}
%exception aa_splitcon {
$action
if (result == NULL) {
SWIG_exception_fail(SWIG_ValueError, "received invalid confinement context");
}
}
extern char *aa_splitcon(char *con, char **mode);