1 /* Implementation of the GETLOG g77 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 <string.h> 29 30 #ifdef HAVE_UNISTD_H 31 # if defined __MINGW32__ && defined HAVE_GETLOGIN 32 # define _POSIX 1 33 # endif 34 #include <unistd.h> 35 #endif 36 #ifdef HAVE_PWD_H 37 #include <pwd.h> 38 #endif 39 40 /* Windows32 version */ 41 #if defined __MINGW32__ && !defined HAVE_GETLOGIN 42 #define WIN32_LEAN_AND_MEAN 43 #include <windows.h> 44 #include <lmcons.h> /* for UNLEN */ 45 46 static char * 47 w32_getlogin (void) 48 { 49 static char name [UNLEN + 1]; 50 DWORD namelen = sizeof (name); 51 52 GetUserName (name, &namelen); 53 return (name[0] == 0 ? NULL : name); 54 } 55 56 #undef getlogin 57 #define getlogin w32_getlogin 58 #define HAVE_GETLOGIN 1 59 60 #endif 61 62 63 /* GETLOG (LOGIN), g77 intrinsic for retrieving the login name for the 64 process. 65 CHARACTER(len=*), INTENT(OUT) :: LOGIN */ 66 67 void PREFIX(getlog) (char *, gfc_charlen_type); 68 export_proto_np(PREFIX(getlog)); 69 70 void 71 PREFIX(getlog) (char * login, gfc_charlen_type login_len) 72 { 73 char *p; 74 75 memset (login, ' ', login_len); /* Blank the string. */ 76 77 #if defined(HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID) 78 struct passwd pwd; 79 struct passwd *result; 80 char *buf; 81 int err; 82 /* To be pedantic, buflen should be determined by 83 sysconf(_SC_GETPW_R_SIZE_MAX), which is 1024 on some tested 84 targets; we do something simple in case the target doesn't 85 support sysconf. */ 86 static const size_t buflen = 1024; 87 buf = xmalloc (buflen); 88 err = getpwuid_r (geteuid (), &pwd, buf, buflen, &result); 89 if (err != 0 || result == NULL) 90 goto cleanup; 91 p = pwd.pw_name; 92 #elif defined(HAVE_GETPWUID) && defined(HAVE_GETEUID) 93 { 94 struct passwd *pw = getpwuid (geteuid ()); 95 if (pw) 96 p = pw->pw_name; 97 else 98 return; 99 } 100 #elif HAVE_GETLOGIN 101 p = getlogin(); 102 # else 103 return; 104 #endif 105 106 if (p == NULL) 107 goto cleanup; 108 109 gfc_charlen_type p_len = strlen (p); 110 if (login_len < p_len) 111 p_len = login_len; 112 memcpy (login, p, p_len); 113 114 cleanup: 115 #if defined (HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID) 116 free (buf); 117 #else 118 ; 119 #endif 120 } 121