[RFC] Get selection to buffer addition

[salvador <salvador@inti.gov.ar>]

Hi all:

What I'm looking for:
  I'm looking for comments and approval for a small addition to the console
driver (drivers/char/console.c).

Small description:
  The included patches adds a couple of new services to the TIOCLINUX ioctl
call, they are:

13 (get selection into a buffer): It copies the contents of the selection
buffer (maintained in kernel space) into a user space provided buffer. Is
something like "paste to a buffer"  instead of just paste to the current
console.

14 (get selection length): Returns the length of the selection buffer (0 if
none selected).
-----------

The included file (compressed and uuencoded) contains diffs that apply
without offsets into 2.4.7 kernel, they are valid for 2.2.18 too (with
offset).
I also include a simple test program that calls the new services. The test
program is really simple and assumes you can open /dev/tty1 (you are
there or you are root ;-)

Additional question: Why the switch uses numbers? Shouldn't these values be
defined as something like TIOCLINUX_GET_SELECTION in a header?

What's the purpose? Just allow pasting in text editors using menues or
without the mouse middle button and avoiding to missinterpret the pasted
text as keystrokes.

SET

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`
end
-------------------------------------------
Test program:

#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
 int i,res,fd,largo;
 char buffer[sizeof(unsigned int)+2],*s;
 unsigned int *lg=(unsigned int *)(buffer+1);

 fd=open("/dev/tty1",O_RDWR);

 printf("Finding the length of the selection:\n");
 buffer[0]=14;
 res=ioctl(fd,TIOCLINUX,&buffer);
 printf("The iotcl returns %d\n",res);
 printf("Length: %u\n",*lg);
 largo=*lg;
 if (*lg==0) return 0;

 printf("Asking for the selection:\n");
 s=(char *)malloc(largo+sizeof(unsigned int)+2);
 s[0]=13;
 lg=(unsigned int *)(s+1);
 *lg=largo;
 res=ioctl(fd,TIOCLINUX,s);
 printf("The iotcl returns %d\n",res);
 largo=*lg;
 printf("Length returned: %d\n",largo);
 s+=1+sizeof(unsigned int);
 s[largo]=0;

 for (i=0; s[i]; i++)
     if (s[i]==13) s[i]=10;
 printf("Selection: '%s' (%d)\n",s,s[0]);
 return 0;
}


--
Salvador Eduardo Tropea (SET). (Electronics Engineer)
Visit my home page: http://welcome.to/SetSoft or
http://www.geocities.com/SiliconValley/Vista/6552/
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                    set@ieee.org
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