[Mingw-users] strtok_r() not implemented

[Anton Shepelev]

Hello, all

I am trying to compile babl, which relies on the
strtok_r function:

https://manned.org/strtok.3

but it seems absent in MinGW. Will it be correct to
add it?
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[Anton Shepelev]

I am trying to compile babl, which relies on the
https://manned.org/strtok.3
but it seems absent in MinGW. Will it be correct
to add it?

Several implementations of strtok_r() are given here:

http://stackoverflow.com/questions/12975022/strtok-r-for-mingw
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[Anton Shepelev]

I am trying to compile babl, which relies on the
https://manned.org/strtok.3
but it seems absent in MinGW.

The interface of strtok_r() is rather ugly. Its
first invocation shall differ from subsequent ones,
whereas the task performed is the same.

I have come up with a more consistent version:

/* returns the index of c in s, or -1 if not found */
/* s shall be a NULL-terminated string */
int chrind( const char * s, const char c )
{ int res = -1;
int ind = 0;
while( s[ind] != ' ' )
{ if( s[ind] == c )
{ res = ind; break; }
ind++;
}
return res;
}

/* Re-entrant version with consistent invocation */
/* str and delim shall be NULL-terminated string */
char* strtok_r2( char** str, const char *delim )
{ char tok_found = 0;
char is_del = 0;
char* res = NULL;

while( **str != ' ' )
{ is_del = chrind( delim, **str ) >= 0;
if( tok_found && is_del )
{ **str = ' '; /* NULL-terminate in place */
( *str )++; /* and wind on to the next symbol */
break;
}
if( !tok_found && !is_del )
{ tok_found = 1;
res = *str; /* save start of token */
}
( *str )++;
}

return res;
}
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[Anton Shepelev]

The interface of strtok_r() is rather ugly. Its
first invocation shall differ from subsequent
ones, whereas the task performed is the same.
[...]

The code fragment is broken because grofg interpret-
ed '\' as an escape character. Here is the correct
code:

/* returns the index of c in s, or -1 if not found */
/* s shall be a NULL-terminated string */
static int chrind( const char * s, const char c )
{ int res = -1;
int ind = 0;
while( s[ind] != '\0' )
{ if( s[ind] == c )
{ res = ind; break; }
ind++;
}
return res;
}

/* Re-entrant version with consistent invocation */
/* str and delim shall be NULL-terminated string */
static char * strtok_r2( char** str, const char *delim )
{ char tok_found = 0;
char is_del = 0;
char* res = NULL;

while( **str != '\0' )
{ is_del = chrind( delim, **str ) >= 0;
if( tok_found && is_del )
{ **str = '\0'; /* NULL-terminate in place */
( *str )++; /* and wind on to the next symbol */
break;
}
if( !tok_found && !is_del )
{ tok_found = 1;
res = *str; /* save start of token */
}
( *str )++;
}

return res;
}
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[Keith Marshall]

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Hash: SHA1

The interface of strtok_r() is rather ugly. Its first invocation
shall differ from subsequent ones, whereas the task performed is
the same.

I agree that the APIs of both strtok() and strtok_r() are utterly
disgusting, but nevertheless they are what they are, and as POSIX.1
prescribes, (and as ISO-C prescribes, in the case of strtok()); the
same is true of Microsoft's strtok_s().

[...]

You are, of course, free to adopt this in your own applications,
but, since it complies with no recognized standard, it will not be
considered for inclusion in MinGW.

The code fragment is broken because grofg ...

What is grofg? Do you, perhaps, mean groff? If so, then...

interpreted '\' as an escape character.

strictly, as \0 appears in your code, it will be interpreted as an
_escape sequence_, representing a non-paddable digit-width space;
(typographically correct digits are all required to occupy uniform
space, even in proportionally spaced fonts). Thus...

[...]
while( s[ind] != '\0' )

the '\0' in this code results in:

while( s[ind] != ' ' )

(as it was shown, in your earlier post).

- --
Regards,
Keith.

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[Anton Shepelev]

strtok_r() is a POSIX.1 function, not ISO-C; thus
providing it goes beyond the MinGW remit of provid-
ing "extensions to support ISO-C99".

Understood.

[...]

You are, of course, free to adopt this in your own
applications, but, since it complies with no recog-
nized standard

That is what have done.

The code fragment is broken because grofg ...

What is grofg? Do you, perhaps, mean groff?

groff, yes.
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[Keith Marshall]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Post by Anton Shepelev
https://manned.org/strtok.3
but it seems absent in MinGW. Will it be correct to add it?

strtok_r() is a POSIX.1 function, not ISO-C; thus providing it goes
beyond the MinGW remit of providing "extensions to support ISO-C99".
That said, if you are prepared to restrict your application to Vista
or later, (or link with non-free MSVCR80.DLL or later), Microsoft do
provide the syntactically equivalent, (in all but name), and mostly
functionally equivalent strtok_s(), so you could simply:

#define strtok_r strtok_s

That should work with MinGW; the entry point is already defined in
libmsvcrt.a, but a potential problem could be that <string.h> does
not (yet) declare a corresponding prototype -- a formal bug report,
to remind me to add it[1], would be helpful.

Of course, if you adopt this approach while linking with MSVCRT.DLL,
then your application will not run on any WinXP or earlier host; (it
will abort with a "DLL entry point not found" exception. It would
be possible to mitigate this, if there is sufficient user demand,
by providing a (likely simple) MinGW implementation of strtok_r();
this would necessitate a formal feature request ticket[2].

[1]: We already have https://sourceforge.net/p/mingw/bugs/1922/,
but it's much too vague; we need a ticket which explicitly names
each "_s" suffixed function for which a prototype is required.

[2]: https://sourceforge.net/p/mingw/bugs/new/

- --
Regards,
Keith.

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[Anton Shepelev]

Post by Keith Marshall
Of course, if you adopt this approach while linking
with MSVCRT.DLL, then your application will not run
on any WinXP or earlier host; (it will abort with a
"DLL entry point not found" exception. It would be
possible to mitigate this, if there is sufficient
user demand, by providing a (likely simple) MinGW
implementation of strtok_r(); this would necessi-
tate a formal feature request ticket[2].

I am on Windows XP, so I will create a ticket.
Shall you need an implementation, or can you reuse
an existing one, or write your own?
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[Keith Marshall]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Post by Keith Marshall
Of course, if you adopt this approach while linking with
MSVCRT.DLL, then your application will not run on any WinXP or
earlier host; (it will abort with a "DLL entry point not found"
exception). It would be possible to mitigate this, if there is
sufficient user demand, by providing a (likely simple) MinGW
implementation of strtok_r(); this would necessitate a formal
feature request ticket[2].

I am on Windows XP, so I will create a ticket.

Thanks.

Shall you need an implementation, or can you reuse an existing
one, or write your own?

I already have one to hand, which should be suitable, thanks.

- --
Regards,
Keith.

Public key available from keys.gnupg.net
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[Anton Shepelev]

Post by Keith Marshall

Of course, if you adopt this approach while link-
ing with MSVCRT.DLL, then your application will
not run on any WinXP or earlier host; (it will
abort with a "DLL entry point not found" excep-
tion. It would be possible to mitigate this, if
there is sufficient user demand, by providing a
(likely simple) MinGW implementation of str-
tok_r(); this would necessitate a formal feature
request ticket[2].

I am on Windows XP, so I will create a ticket.
Shall you need an implementation, or can you reuse
an existing one, or write your own?

Thanks.

Pray take no umbrage if I do it belatedly.
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[Anton Shepelev]

Post by Keith Marshall

I am trying to compile babl, which relies on the
https://manned.org/strtok.3
but it seems absent in MinGW. Will it be correct
to add it?

It would be possible to mitigate this, if there is
sufficient user demand, by providing a (likely
simple) MinGW implementation of strtok_r(); this
would necessitate a formal feature request ticket

Ticked created:

https://sourceforge.net/p/mingw/bugs/2342
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[Keith Marshall]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Post by Anton Shepelev

Post by Keith Marshall

I am trying to compile babl, which relies on the
https://manned.org/strtok.3
but it seems absent in MinGW. Will it be correct
to add it?

It would be possible to mitigate this, if there is
sufficient user demand, by providing a (likely
simple) MinGW implementation of strtok_r(); this
would necessitate a formal feature request ticket

https://sourceforge.net/p/mingw/bugs/2342

Thanks. I've added a proposed implementation.

I've enabled voting on the ticket. I am in favour of incorporating this
into libmingwex.a, and have voted accordingly. If any other users would
care to do likewise, please do so; if you choose to vote against, please
add a comment to explain why.

- --
Regards,
Keith.

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[Anton Shepelev]

Post by Keith Marshall

Post by Anton Shepelev

I am trying to compile babl, which relies on
https://manned.org/strtok.3
but it seems absent in MinGW. Will it be
correct to add it?

It would be possible to mitigate this, if
there is sufficient user demand, by providing
a (likely simple) MinGW implementation of str-
tok_r(); this would necessitate a formal fea-
ture request ticket

https://sourceforge.net/p/mingw/bugs/2342

Thanks. I've added a proposed implementation.
I've enabled voting on the ticket. I am in favour
of incorporating this into libmingwex.a, and have
voted accordingly. If any other users would care
to do likewise, please do so; if you choose to
vote against, please add a comment to explain why.

Thank you very much.

So is it the static library for extra (supplemen-
tary) functions?
--
Please, do not forward replies to my e-mail.


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