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111
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1 /* Implementation of the PAUSE statement.
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2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
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3 Contributed by Paul Brook <paul@nowt.org>
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27 #include <string.h>
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28
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29 #ifdef HAVE_UNISTD_H
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30 #include <unistd.h>
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31 #endif
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32
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33
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34 static void
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35 do_pause (void)
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36 {
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37 char buff[4];
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38 estr_write ("To resume execution, type go. "
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39 "Other input will terminate the job.\n");
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40
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41 fgets(buff, 4, stdin);
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42 if (strncmp(buff, "go\n", 3) != 0)
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43 stop_string ('\0', 0);
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44 estr_write ("RESUMED\n");
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45 }
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46
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47 /* A numeric PAUSE statement. */
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48
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49 extern void pause_numeric (GFC_INTEGER_4);
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50 export_proto(pause_numeric);
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51
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52 void
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53 pause_numeric (GFC_INTEGER_4 code)
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54 {
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55 st_printf ("PAUSE %d\n", (int) code);
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56 do_pause ();
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57 }
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58
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59 /* A character string or blank PAUSE statement. */
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60
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61 extern void pause_string (char *string, GFC_INTEGER_4 len);
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62 export_proto(pause_string);
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63
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64 void
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65 pause_string (char *string, GFC_INTEGER_4 len)
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66 {
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67 estr_write ("PAUSE ");
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68 ssize_t w = write (STDERR_FILENO, string, len);
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69 (void) sizeof (w); /* Avoid compiler warning about not using write
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70 return val. */
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71 estr_write ("\n");
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72
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73 do_pause ();
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74 }
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