1 /* Implementation of the PAUSE statement. 2 Copyright (C) 2002-2020 Free Software Foundation, Inc. 3 Contributed by Paul Brook <paul@nowt.org> 4 5 This file is part of the GNU Fortran runtime library (libgfortran). 6 7 Libgfortran is free software; you can redistribute it and/or 8 modify it under the terms of the GNU General Public 9 License as published by the Free Software Foundation; either 10 version 3 of the License, or (at your option) any later version. 11 12 Libgfortran is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 #include "libgfortran.h" 27 #include <string.h> 28 29 #ifdef HAVE_UNISTD_H 30 #include <unistd.h> 31 #endif 32 33 34 static void 35 do_pause (void) 36 { 37 char buff[4]; 38 estr_write ("To resume execution, type go. " 39 "Other input will terminate the job.\n"); 40 41 fgets(buff, 4, stdin); 42 if (strncmp(buff, "go\n", 3) != 0) 43 stop_string ('\0', 0, false); 44 estr_write ("RESUMED\n"); 45 } 46 47 /* A numeric PAUSE statement. */ 48 49 extern void pause_numeric (GFC_INTEGER_8); 50 export_proto(pause_numeric); 51 52 void 53 pause_numeric (GFC_INTEGER_8 code) 54 { 55 st_printf ("PAUSE %ld\n", (long) code); 56 do_pause (); 57 } 58 59 /* A character string or blank PAUSE statement. */ 60 61 extern void pause_string (char *string, size_t len); 62 export_proto(pause_string); 63 64 void 65 pause_string (char *string, size_t len) 66 { 67 struct iovec iov[3]; 68 69 iov[0].iov_base = (char*) "PAUSE "; 70 iov[0].iov_len = strlen (iov[0].iov_base); 71 iov[1].iov_base = string; 72 iov[1].iov_len = len; 73 iov[2].iov_base = (char*) "\n"; 74 iov[2].iov_len = 1; 75 estr_writev (iov, 3); 76 77 do_pause (); 78 } 79