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Annotation of OpenXM_contrib/gmp/tests/spinner.c, Revision 1.1

1.1     ! ohara       1: /* A stupid little spinning wheel designed to make it look like useful work
        !             2:    is being done.
        !             3:
        !             4: Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Lesser General Public License as published by
        !            10: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Lesser General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "config.h"
        !            24:
        !            25: #include <signal.h>
        !            26: #include <stdio.h>
        !            27: #include <stdlib.h>
        !            28: #if HAVE_UNISTD_H
        !            29: #include <unistd.h>     /* for isatty */
        !            30: #endif
        !            31:
        !            32: #include "gmp.h"
        !            33: #include "gmp-impl.h"
        !            34:
        !            35: #include "tests.h"
        !            36:
        !            37:
        !            38: /* "alarm" is not available on mingw32, and the SIGALRM constant is not
        !            39:    defined.  Don't bother with a spinner in this case.  */
        !            40: #if ! HAVE_ALARM || ! defined (SIGALRM)
        !            41: #define alarm(n)          abort()
        !            42: #define signal(sig,func)  SIG_ERR
        !            43: #endif
        !            44:
        !            45:
        !            46: /* An application can update this to get a count printed with the spinner.
        !            47:    If left at 0, no count is printed. */
        !            48:
        !            49: unsigned long  spinner_count = 0;
        !            50:
        !            51:
        !            52: int  spinner_wanted = -1;  /* -1 uninitialized, 1 wanted, 0 not */
        !            53: int  spinner_tick = 1;     /* 1 ready to print, 0 not */
        !            54:
        !            55:
        !            56: /*ARGSUSED*/
        !            57: RETSIGTYPE
        !            58: spinner_signal (int signum)
        !            59: {
        !            60:   spinner_tick = 1;
        !            61:
        !            62:   if (signal (SIGALRM, spinner_signal) == SIG_ERR)
        !            63:     {
        !            64:       printf ("spinner_signal(): Oops, cannot reinstall SIGALRM\n");
        !            65:       abort ();
        !            66:     }
        !            67:   alarm (1);
        !            68: }
        !            69:
        !            70:
        !            71: /* Initialize the spinner.
        !            72:
        !            73:    This is done the first time spinner() is called, so an application
        !            74:    doesn't need to call this directly.
        !            75:
        !            76:    The spinner is only wanted if the output is a tty.  */
        !            77:
        !            78: #define SPINNER_WANTED_INIT() \
        !            79:   if (spinner_wanted < 0) spinner_init ()
        !            80:
        !            81: void
        !            82: spinner_init (void)
        !            83: {
        !            84:   spinner_wanted = isatty (fileno (stdout));
        !            85:   if (spinner_wanted == -1)
        !            86:     abort ();
        !            87:
        !            88:   if (!spinner_wanted)
        !            89:     return;
        !            90:
        !            91:   if (signal (SIGALRM, spinner_signal) == SIG_ERR)
        !            92:     {
        !            93:       printf ("(no spinner)\r");
        !            94:       spinner_tick = 0;
        !            95:       return;
        !            96:     }
        !            97:   alarm (1);
        !            98:
        !            99:   /* unbufferred output so the spinner will show up */
        !           100:   setbuf (stdout, NULL);
        !           101: }
        !           102:
        !           103:
        !           104: void
        !           105: spinner (void)
        !           106: {
        !           107:   static const char  data[] = { '|', '/', '-', '\\' };
        !           108:   static int         pos = 0;
        !           109:
        !           110:   char  buf[128];
        !           111:
        !           112:   SPINNER_WANTED_INIT ();
        !           113:
        !           114:   if (spinner_tick)
        !           115:     {
        !           116:       buf[0] = data[pos];
        !           117:       pos = (pos + 1) % numberof (data);
        !           118:       spinner_tick = 0;
        !           119:
        !           120:       if (spinner_count != 0)
        !           121:         {
        !           122:           sprintf (buf+1, " %lu\r", spinner_count);
        !           123:         }
        !           124:       else
        !           125:         {
        !           126:           buf[1] = '\r';
        !           127:           buf[2] = '\0';
        !           128:         }
        !           129:       fputs (buf, stdout);
        !           130:     }
        !           131: }