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111
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1 /* Implementation of the GETLOG g77 intrinsic.
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131
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2 Copyright (C) 2005-2018 Free Software Foundation, Inc.
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111
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3 Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
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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
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28 #include <string.h>
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29
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30 #ifdef HAVE_UNISTD_H
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31 # if defined __MINGW32__ && defined HAVE_GETLOGIN
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32 # define _POSIX 1
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33 # endif
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34 #include <unistd.h>
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35 #endif
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36 #ifdef HAVE_PWD_H
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37 #include <pwd.h>
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38 #endif
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39
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40 /* Windows32 version */
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41 #if defined __MINGW32__ && !defined HAVE_GETLOGIN
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42 #define WIN32_LEAN_AND_MEAN
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43 #include <windows.h>
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44 #include <lmcons.h> /* for UNLEN */
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45
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46 static char *
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47 w32_getlogin (void)
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48 {
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49 static char name [UNLEN + 1];
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50 DWORD namelen = sizeof (name);
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51
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52 GetUserName (name, &namelen);
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53 return (name[0] == 0 ? NULL : name);
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54 }
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55
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56 #undef getlogin
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57 #define getlogin w32_getlogin
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58 #define HAVE_GETLOGIN 1
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59
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60 #endif
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61
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62
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63 /* GETLOG (LOGIN), g77 intrinsic for retrieving the login name for the
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64 process.
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65 CHARACTER(len=*), INTENT(OUT) :: LOGIN */
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66
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67 void PREFIX(getlog) (char *, gfc_charlen_type);
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68 export_proto_np(PREFIX(getlog));
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69
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70 void
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71 PREFIX(getlog) (char * login, gfc_charlen_type login_len)
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72 {
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73 char *p;
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74
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75 memset (login, ' ', login_len); /* Blank the string. */
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76
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77 #if defined(HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID)
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78 struct passwd pwd;
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79 struct passwd *result;
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80 char *buf;
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81 int err;
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82 /* To be pedantic, buflen should be determined by
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83 sysconf(_SC_GETPW_R_SIZE_MAX), which is 1024 on some tested
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84 targets; we do something simple in case the target doesn't
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85 support sysconf. */
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86 static const size_t buflen = 1024;
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87 buf = xmalloc (buflen);
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88 err = getpwuid_r (geteuid (), &pwd, buf, buflen, &result);
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89 if (err != 0 || result == NULL)
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90 goto cleanup;
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91 p = pwd.pw_name;
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92 #elif defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
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93 {
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94 struct passwd *pw = getpwuid (geteuid ());
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95 if (pw)
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96 p = pw->pw_name;
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97 else
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98 return;
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99 }
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100 #elif HAVE_GETLOGIN
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101 p = getlogin();
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102 # else
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103 return;
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104 #endif
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105
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106 if (p == NULL)
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107 goto cleanup;
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108
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109 gfc_charlen_type p_len = strlen (p);
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111
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110 if (login_len < p_len)
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111 p_len = login_len;
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112 memcpy (login, p, p_len);
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113
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114 cleanup:
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115 #if defined (HAVE_POSIX_GETPWUID_R) && defined(HAVE_GETEUID)
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116 free (buf);
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117 #else
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118 ;
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119 #endif
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120 }
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