Blame tests/spinner.c

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/* A stupid little spinning wheel designed to make it look like useful work
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   is being done.
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Copyright 1999-2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
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#include "config.h"
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>     /* for isatty */
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#endif
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "tests.h"
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/* "alarm" is not available on mingw32, and the SIGALRM constant is not
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   defined.  Don't bother with a spinner in this case.  */
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#if ! HAVE_ALARM || ! defined (SIGALRM)
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#define alarm(n)          abort()
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#define signal(sig,func)  SIG_ERR
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#endif
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/* An application can update this to get a count printed with the spinner.
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   If left at 0, no count is printed. */
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unsigned long  spinner_count = 0;
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int  spinner_wanted = -1;  /* -1 uninitialized, 1 wanted, 0 not */
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int  spinner_tick = 1;     /* 1 ready to print, 0 not */
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/*ARGSUSED*/
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RETSIGTYPE
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spinner_signal (int signum)
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{
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  spinner_tick = 1;
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  if (signal (SIGALRM, spinner_signal) == SIG_ERR)
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    {
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      printf ("spinner_signal(): Oops, cannot reinstall SIGALRM\n");
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      abort ();
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    }
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  alarm (1);
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}
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/* Initialize the spinner.
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   This is done the first time spinner() is called, so an application
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   doesn't need to call this directly.
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   The spinner is only wanted if the output is a tty.  */
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#define SPINNER_WANTED_INIT() \
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  if (spinner_wanted < 0) spinner_init ()
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void
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spinner_init (void)
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{
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  spinner_wanted = isatty (fileno (stdout));
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  if (spinner_wanted == -1)
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    abort ();
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  if (!spinner_wanted)
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    return;
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  if (signal (SIGALRM, spinner_signal) == SIG_ERR)
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    {
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      printf ("(no spinner)\r");
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      spinner_tick = 0;
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      return;
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    }
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  alarm (1);
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  /* unbuffered output so the spinner will show up */
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  setbuf (stdout, NULL);
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}
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void
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spinner (void)
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{
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  static const char  data[] = { '|', '/', '-', '\\' };
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  static int         pos = 0;
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  char  buf[128];
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  SPINNER_WANTED_INIT ();
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  if (spinner_tick)
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    {
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      buf[0] = data[pos];
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      pos = (pos + 1) % numberof (data);
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      spinner_tick = 0;
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      if (spinner_count != 0)
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	{
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	  sprintf (buf+1, " %lu\r", spinner_count);
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	}
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      else
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	{
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	  buf[1] = '\r';
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	  buf[2] = '\0';
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	}
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      fputs (buf, stdout);
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    }
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}