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From: Julia Lawall <julia.lawall@inria.fr>
To: Strace Labs <stracelabs@gmail.com>
Cc: cocci@systeme.lip6.fr
Subject: Re: [Cocci] Replacing printf/format calls based on the data-type
Date: Thu, 28 Nov 2019 08:07:57 +0100 (CET)
Message-ID: <alpine.DEB.2.21.1911280807030.3704@hadrien> (raw)
In-Reply-To: <CABvP5W1W=p1-n_831VaiJyNsHrepFS0CNJSDQqmfPkrC1rx=Ww@mail.gmail.com>

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On Thu, 28 Nov 2019, Strace Labs wrote:

> Hi,
> I am working on a semantic patch for replacing specific format string token based on the used data-type.
> so, I have several calls of my_printf() and some special macros pointing to them around my code.
>
> e.g: part of my code.
> .....
> struct mydata *m;
> struct mydata h;
> .....
> my_printf("%s", m->name);
> .....
> my_printf("%s", h.name);
> .....
> my_printf("whatever id %d following the string %s\n", id, m->name);
> ....
> Macro_to_my_printf("Hey id %d, let's see %s\n", id, h.name);
> .....
> Macro2_to_my_printf(fd, "Hey id %d, let's see %s\n", id, m->name);
> .....
>
> My current humble *.cocci
>
> $ cat fix-my_printf.cocci
> @r1_heap@
> struct mydata *SMD;
> format F =~ "s";
> @@
> -my_printf("%@F@", SMD->name);
> +my_printf("%m", SMD);
>
> @r1_stack@
> struct mydata SMD;
> format F =~ "s";
> @@
> -my_printf("%@F@", SMD.name);
> +my_printf("%m", &SMD);
> $
>
> But, I can match only with partial content as can be seen below.
>
> $ spatch --partial-match --sp-file fix-my_printf.cocci sample-format-string.c | egrep "^(\+|-)"
> HANDLING: sample-format-string.c
> diff =
> HANDLING: /Volumes/Users/jpereira/Devel/Sandbox/sample-format-string.c
> diff =
> --- /Volumes/Users/jpereira/Devel/Sandbox/sample-format-string.c
> +++ /var/folders/ld/6tg9c6qj4fx4c85q26mcqrsh0000gn/T/cocci-output-24659-130f86-sample-format-string.c
> - my_printf("%s", m->name);
> + my_printf("%m", m);
> - my_printf("%s", h.name);
> + my_printf("%m", &h);
> $
>
> Anyone could give me a light about how to proceed to match the entire ".....string format..." ?

I think that what you are asking is why you can't write a pattern like:

foo("...
-%@d@
+%x
  ...")

At the moment, there seems to be a bug.  I will check on that.

julia

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Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-28  2:11 Strace Labs
2019-11-28  7:07 ` Julia Lawall [this message]
2019-11-28 17:45   ` Strace Labs
2019-11-29 14:48   ` [Cocci] Replacing printf() parameters according to used data types Markus Elfring
2019-11-28  7:50 ` Markus Elfring
2019-11-29  0:35   ` Jorge Pereira
2019-11-29  8:29     ` Markus Elfring
2019-11-29 10:57       ` Strace Labs
2019-11-29 12:33         ` Markus Elfring
2019-11-29 14:47           ` Strace Labs
2019-11-29 16:08             ` Markus Elfring
2019-11-29 17:19               ` Strace Labs
2019-11-29 17:45                 ` Markus Elfring
2019-11-29 20:55             ` Julia Lawall
2019-11-30  2:25               ` Strace Labs
2019-11-30  6:35                 ` Julia Lawall
2019-11-30  8:46                 ` Markus Elfring
2019-12-01  8:00                 ` [Cocci] Changing format string usage with SmPL? Markus Elfring
2019-12-03  3:30                   ` Strace Labs
2019-12-03  5:18                     ` Julia Lawall
2019-12-03 13:28                       ` Markus Elfring
2019-12-03 15:43                       ` [Cocci] Generation of expression lists by SmPL script rules? Markus Elfring
2019-12-03 17:28                       ` [Cocci] Changing format string usage with SmPL? Strace Labs
2019-12-04  0:21                         ` Strace Labs
2019-12-06 19:36                           ` Markus Elfring
2019-12-07  7:49                           ` Markus Elfring
2019-12-04  6:47                         ` Julia Lawall
2019-12-06 19:44                           ` Markus Elfring
2019-12-06 19:20                         ` Markus Elfring
2019-12-03 10:01                     ` Markus Elfring
2019-11-30 15:11               ` [Cocci] Replacing printf() parameters according to used data types Markus Elfring

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