Re: Program exited with code -11 when calling
On Wednesday, 1 July 2020 at 05:47:16 UTC, Anthony wrote:
On Wednesday, 1 July 2020 at 05:33:48 UTC, H. S. Teoh wrote:
On Wed, Jul 01, 2020 at 05:04:28AM +, Anthony via
Digitalmars-d-learn wrote: [...]
auto str_utf8 = str.toUTF8();
bson_error_t error
auto bson = bson_new_from_json(cast(const
uint8_t*)str_utf8.ptr, -1,
);
I get a "Program exited with code -11" message.
Does anyone know what I'm doing wrong?
D strings are generally not null-terminated (except for
literals). Before passing them to a C function you need to add
a trailing null. Try using std.conv.toStringz instead of
casting the pointer yourself.
T
Thanks H. S. Teoh.
Hmm, still same result though.
import std.string;
auto str = toStringz("{\"a\":1}");
bson_error_t error;
bson_new_from_json(str, -1, );
extern(C) {
...
bson_t* bson_new_from_json(const char* data, long len,
bson_error_t* error);
}
Noob mistake:
I declared an array that should be of fixed size.
struct bson_error_t {
char[] message;
};
Should be:
struct bson_error_t {
char[504] message;
};
:/
Re: Program exited with code -11 when calling
bson_t* bson_new_from_json(in char* data, long len, bson_error_t*
error);
string str_utf8 = "{\"a\":1}";
bson_error_t error;
auto bson = bson_new_from_json(str_utf8.ptr, str_utf8.length,
);
You have a wrong declaration for bson_error_t too.
Re: Program exited with code -11 when calling
On Wednesday, 1 July 2020 at 05:33:48 UTC, H. S. Teoh wrote:
On Wed, Jul 01, 2020 at 05:04:28AM +, Anthony via
Digitalmars-d-learn wrote: [...]
auto str_utf8 = str.toUTF8();
bson_error_t error
auto bson = bson_new_from_json(cast(const
uint8_t*)str_utf8.ptr, -1,
);
I get a "Program exited with code -11" message.
Does anyone know what I'm doing wrong?
D strings are generally not null-terminated (except for
literals). Before passing them to a C function you need to add
a trailing null. Try using std.conv.toStringz instead of
casting the pointer yourself.
T
Thanks H. S. Teoh.
Hmm, still same result though.
import std.string;
auto str = toStringz("{\"a\":1}");
bson_error_t error;
bson_new_from_json(str, -1, );
extern(C) {
...
bson_t* bson_new_from_json(const char* data, long len,
bson_error_t* error);
}
Re: Program exited with code -11 when calling
On Wednesday, 1 July 2020 at 05:09:47 UTC, Cym13 wrote:
On Wednesday, 1 July 2020 at 05:04:28 UTC, Anthony wrote:
I'm trying to convert this c function:
bson_t *bson_new_from_json (const uint8_t *data, ssize_t len,
bson_error_t *error);
Into a D function. This is my attempt:
extern(C) {
struct bson_t;
struct bson_error_t;
bson_t* bson_new_from_json(const uint8_t* data, long len,
bson_error_t* error);
}
However when I try it, for example:
auto str_utf8 = str.toUTF8();
bson_error_t error
auto bson = bson_new_from_json(cast(const
uint8_t*)str_utf8.ptr, -1, );
I get a "Program exited with code -11" message.
Does anyone know what I'm doing wrong?
Thanks
I don't know the exact function you are trying to use, but -11
means "segmentation fault" on linux. This means that your
program is trying to read or write a memory location that it is
not supposed to. This typically happens during buffer overflows
and similar memory corruption bugs.
One thing that jumps to me is the -1 in your call instead of
the length. Without knowing the C function's implementation I
would expect it to mean either "read before the array" which
would be a buffer overflow or to have the special meaning of
"deduce the string size yourself". In that last case I would
expect bson_new_from_json to expect a NUL-terminated array, but
I don't know if your UTF8 array is NUL-terminated.
Thanks for getting back to me.
Yeah I figured it was a segmentation fault, however, I don't know
exactly how to pinpoint where this is happening. I'm wondering if
there's anything wrong with how I'm casting the data since
everything is self contained (assuming bson_new_from_json is
correct since it works using c directly).
void foo() {
import std.utf;
import core.stdc.stdint;
auto str_utf8 = "{\"a\":1}";
bson_error_t error;
bson_new_from_json(cast(uint8_t*)str_utf8,
(cast(uint8_t[])str_utf8).length, );
}
Re -1 in the call: Apparently it uses strlen() to deduce the
size. However, I tried explicitly state the array length but had
no luck.
Re: Program exited with code -11 when calling
On Wed, Jul 01, 2020 at 05:04:28AM +, Anthony via Digitalmars-d-learn wrote: [...] > auto str_utf8 = str.toUTF8(); > bson_error_t error > > auto bson = bson_new_from_json(cast(const uint8_t*)str_utf8.ptr, -1, > ); > > > I get a "Program exited with code -11" message. > Does anyone know what I'm doing wrong? D strings are generally not null-terminated (except for literals). Before passing them to a C function you need to add a trailing null. Try using std.conv.toStringz instead of casting the pointer yourself. T -- A programming language should be a toolbox for the programmer to draw upon, not a minefield of dangerous explosives that you have to very carefully avoid touching in the wrong way.
Re: Program exited with code -11 when calling
On Wednesday, 1 July 2020 at 05:04:28 UTC, Anthony wrote:
I'm trying to convert this c function:
bson_t *bson_new_from_json (const uint8_t *data, ssize_t len,
bson_error_t *error);
Into a D function. This is my attempt:
extern(C) {
struct bson_t;
struct bson_error_t;
bson_t* bson_new_from_json(const uint8_t* data, long len,
bson_error_t* error);
}
However when I try it, for example:
auto str_utf8 = str.toUTF8();
bson_error_t error
auto bson = bson_new_from_json(cast(const
uint8_t*)str_utf8.ptr, -1, );
I get a "Program exited with code -11" message.
Does anyone know what I'm doing wrong?
Thanks
I don't know the exact function you are trying to use, but -11
means "segmentation fault" on linux. This means that your program
is trying to read or write a memory location that it is not
supposed to. This typically happens during buffer overflows and
similar memory corruption bugs.
One thing that jumps to me is the -1 in your call instead of the
length. Without knowing the C function's implementation I would
expect it to mean either "read before the array" which would be a
buffer overflow or to have the special meaning of "deduce the
string size yourself". In that last case I would expect
bson_new_from_json to expect a NUL-terminated array, but I don't
know if your UTF8 array is NUL-terminated.
Program exited with code -11 when calling
I'm trying to convert this c function:
bson_t *bson_new_from_json (const uint8_t *data, ssize_t len,
bson_error_t *error);
Into a D function. This is my attempt:
extern(C) {
struct bson_t;
struct bson_error_t;
bson_t* bson_new_from_json(const uint8_t* data, long len,
bson_error_t* error);
}
However when I try it, for example:
auto str_utf8 = str.toUTF8();
bson_error_t error
auto bson = bson_new_from_json(cast(const uint8_t*)str_utf8.ptr,
-1, );
I get a "Program exited with code -11" message.
Does anyone know what I'm doing wrong?
Thanks
