1 /* Implementation of the HOSTNM intrinsic. 2 Copyright (C) 2005-2019 Free Software Foundation, Inc. 3 Contributed by François-Xavier Coudert <coudert@clipper.ens.fr> 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 28 #include <errno.h> 29 #include <string.h> 30 31 #ifdef HAVE_UNISTD_H 32 #include <unistd.h> 33 #endif 34 35 #include <limits.h> 36 37 #ifndef HOST_NAME_MAX 38 #define HOST_NAME_MAX 255 39 #endif 40 41 42 /* Windows32 version */ 43 #if defined __MINGW32__ && !defined HAVE_GETHOSTNAME 44 #define WIN32_LEAN_AND_MEAN 45 #include <windows.h> 46 #include <errno.h> 47 48 static int 49 w32_gethostname (char *name, size_t len) 50 { 51 /* We could try the WinSock API gethostname, but that will 52 fail if WSAStartup function has has not been called. We don't 53 really need a name that will be understood by socket API, so avoid 54 unnecessary dependence on WinSock libraries by using 55 GetComputerName instead. */ 56 57 /* On Win9x GetComputerName fails if the input size is less 58 than MAX_COMPUTERNAME_LENGTH + 1. */ 59 char buffer[MAX_COMPUTERNAME_LENGTH + 1]; 60 DWORD size = sizeof (buffer); 61 62 if (!GetComputerName (buffer, &size)) 63 return -1; 64 65 if ((size = strlen (buffer) + 1) > len) 66 { 67 errno = EINVAL; 68 /* Truncate as per POSIX spec. We do not NUL-terminate. */ 69 size = len; 70 } 71 memcpy (name, buffer, (size_t) size); 72 73 return 0; 74 } 75 76 #undef gethostname 77 #define gethostname w32_gethostname 78 #define HAVE_GETHOSTNAME 1 79 80 #endif 81 82 83 /* SUBROUTINE HOSTNM(NAME, STATUS) 84 CHARACTER(len=*), INTENT(OUT) :: NAME 85 INTEGER, INTENT(OUT), OPTIONAL :: STATUS */ 86 87 #ifdef HAVE_GETHOSTNAME 88 static int 89 hostnm_0 (char *name, gfc_charlen_type name_len) 90 { 91 char p[HOST_NAME_MAX + 1]; 92 int val; 93 94 memset (name, ' ', name_len); 95 96 size_t reqlen = sizeof (p) > (size_t) name_len + 1 97 ? (size_t) name_len + 1: sizeof (p); 98 val = gethostname (p, reqlen); 99 100 if (val == 0) 101 { 102 for (gfc_charlen_type i = 0; i < name_len && p[i] != '\0'; i++) 103 name[i] = p[i]; 104 } 105 106 return ((val == 0) ? 0 : errno); 107 } 108 109 extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type); 110 iexport_proto(hostnm_i4_sub); 111 112 void 113 hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len) 114 { 115 int val = hostnm_0 (name, name_len); 116 if (status != NULL) 117 *status = val; 118 } 119 iexport(hostnm_i4_sub); 120 121 extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type); 122 iexport_proto(hostnm_i8_sub); 123 124 void 125 hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len) 126 { 127 int val = hostnm_0 (name, name_len); 128 if (status != NULL) 129 *status = val; 130 } 131 iexport(hostnm_i8_sub); 132 133 extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type); 134 export_proto(hostnm); 135 136 GFC_INTEGER_4 137 hostnm (char *name, gfc_charlen_type name_len) 138 { 139 return hostnm_0 (name, name_len); 140 } 141 #endif 142