132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/* 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, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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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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/* unbufferred 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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}
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