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f77b6ca3 | 1 | /* Implementation of the HOSTNM intrinsic. |
cbe34bb5 | 2 | Copyright (C) 2005-2017 Free Software Foundation, Inc. |
f77b6ca3 FXC |
3 | Contributed by François-Xavier Coudert <coudert@clipper.ens.fr> |
4 | ||
581d2326 | 5 | This file is part of the GNU Fortran runtime library (libgfortran). |
f77b6ca3 FXC |
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 | |
748086b7 | 10 | version 3 of the License, or (at your option) any later version. |
f77b6ca3 FXC |
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 | ||
748086b7 JJ |
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/>. */ | |
f77b6ca3 | 25 | |
f77b6ca3 FXC |
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 | ||
581d2326 JB |
35 | #include <limits.h> |
36 | ||
37 | #ifndef HOST_NAME_MAX | |
38 | #define HOST_NAME_MAX 255 | |
39 | #endif | |
40 | ||
86ab6320 FXC |
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 | ||
f77b6ca3 FXC |
82 | |
83 | /* SUBROUTINE HOSTNM(NAME, STATUS) | |
84 | CHARACTER(len=*), INTENT(OUT) :: NAME | |
85 | INTEGER, INTENT(OUT), OPTIONAL :: STATUS */ | |
86 | ||
87 | #ifdef HAVE_GETHOSTNAME | |
581d2326 JB |
88 | static int |
89 | hostnm_0 (char *name, gfc_charlen_type name_len) | |
f77b6ca3 | 90 | { |
84aff3c2 | 91 | int val, i; |
581d2326 | 92 | char p[HOST_NAME_MAX + 1]; |
f77b6ca3 FXC |
93 | |
94 | memset (name, ' ', name_len); | |
f77b6ca3 | 95 | |
581d2326 JB |
96 | size_t reqlen = sizeof (p) > (size_t) name_len + 1 |
97 | ? (size_t) name_len + 1: sizeof (p); | |
98 | val = gethostname (p, reqlen); | |
f77b6ca3 FXC |
99 | |
100 | if (val == 0) | |
101 | { | |
84aff3c2 JB |
102 | i = -1; |
103 | while (i < name_len && p[++i] != '\0') | |
f77b6ca3 FXC |
104 | name[i] = p[i]; |
105 | } | |
106 | ||
581d2326 JB |
107 | return ((val == 0) ? 0 : errno); |
108 | } | |
109 | ||
110 | extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type); | |
111 | iexport_proto(hostnm_i4_sub); | |
112 | ||
113 | void | |
114 | hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len) | |
115 | { | |
116 | int val = hostnm_0 (name, name_len); | |
f77b6ca3 | 117 | if (status != NULL) |
581d2326 | 118 | *status = val; |
f77b6ca3 FXC |
119 | } |
120 | iexport(hostnm_i4_sub); | |
121 | ||
122 | extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type); | |
123 | iexport_proto(hostnm_i8_sub); | |
124 | ||
125 | void | |
126 | hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len) | |
127 | { | |
581d2326 | 128 | int val = hostnm_0 (name, name_len); |
f77b6ca3 | 129 | if (status != NULL) |
581d2326 | 130 | *status = val; |
f77b6ca3 FXC |
131 | } |
132 | iexport(hostnm_i8_sub); | |
133 | ||
134 | extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type); | |
135 | export_proto(hostnm); | |
136 | ||
137 | GFC_INTEGER_4 | |
138 | hostnm (char *name, gfc_charlen_type name_len) | |
139 | { | |
581d2326 | 140 | return hostnm_0 (name, name_len); |
f77b6ca3 FXC |
141 | } |
142 | #endif |