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/*
* $Id: pgusage.c,v 2.9 2002/03/29 04:13:04 bkorb Exp $
*
* Automated Options Paged Usage module.
*
* This routine will run run-on options through a pager so the
* user may examine, print or edit them at their leisure.
*/
/*
* Automated Options copyright 1992-2002 Bruce Korb
*
* Automated Options is free software.
* You may redistribute it and/or modify it under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2, or (at your option) any later version.
*
* Automated Options is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Automated Options. See the file "COPYING". If not,
* write to: The Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* As a special exception, Bruce Korb gives permission for additional
* uses of the text contained in his release of AutoOpts.
*
* The exception is that, if you link the AutoOpts library with other
* files to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the AutoOpts library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by Bruce Korb under
* the name AutoOpts. If you copy code from other sources under the
* General Public License into a copy of AutoOpts, as the General Public
* License permits, the exception does not apply to the code that you add
* in this way. To avoid misleading anyone as to the status of such
* modified files, you must delete this exception notice from them.
*
* If you write modifications of your own for AutoOpts, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <memory.h>
#include "autoopts.h"
tePagerState pagerState = PAGER_STATE_INITIAL;
/*
* Run the usage output through a pager.
* This is very handy if it is very long.
*/
void
doPagedUsage( pOptions, pOD )
tOptions* pOptions;
tOptDesc* pOD;
{
static pid_t my_pid;
char zPageUsage[ 1024 ];
/*
* IF we are being called after the usage proc is done
* (and thus has called "exit(2)")
* THEN invoke the pager to page through the usage file we created.
*/
switch (pagerState) {
case PAGER_STATE_INITIAL:
{
my_pid = getpid();
snprintf( zPageUsage, sizeof(zPageUsage), "/tmp/use.%lu", (tUL)my_pid );
unlink( zPageUsage );
/*
* Set stderr to this temporary file
*/
if (freopen( zPageUsage, "w" FOPEN_BINARY_FLAG, stderr ) != stderr)
_exit( EXIT_FAILURE );
pagerState = PAGER_STATE_READY;
/*
* Set up so this routine gets called during the exit logic
*/
atexit( (void(*)(void))doPagedUsage );
/*
* The usage procedure will now put the usage information into
* the temporary file we created above.
*/
(*pOptions->pUsageProc)( pOptions, EXIT_SUCCESS );
/*NOTREACHED*/
_exit( EXIT_FAILURE );
}
case PAGER_STATE_READY:
{
char* pzPager = getenv( "PAGER" );
/*
* Use the "more(1)" program if "PAGER" has not been defined
*/
if (pzPager == (char*)NULL)
pzPager = "more";
/*
* Page the file and remove it when done.
*/
snprintf( zPageUsage, sizeof(zPageUsage),
"%s /tmp/use.%lu ; rm -f /tmp/use.%2$lu",
pzPager, (tUL)my_pid );
fclose( stderr );
dup2( STDOUT_FILENO, STDERR_FILENO );
system( zPageUsage );
}
case PAGER_STATE_CHILD:
/*
* This is a child process. We are not ready to
* run the pager program yet.
*/
break;
}
}
/*
* Local Variables:
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* pgusage.c ends here */
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