1 /* Implementation of the GETCWD intrinsic. 2 Copyright (C) 2004-2019 Free Software Foundation, Inc. 3 Contributed by Steven G. Kargl <kargls@comcast.net>. 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 #include <errno.h> 30 31 #ifdef HAVE_UNISTD_H 32 #include <unistd.h> 33 #endif 34 35 #ifdef HAVE_GETCWD 36 37 extern void getcwd_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type); 38 iexport_proto(getcwd_i4_sub); 39 40 void 41 getcwd_i4_sub (char *cwd, GFC_INTEGER_4 *status, gfc_charlen_type cwd_len) 42 { 43 int err; 44 45 if (getcwd (cwd, cwd_len)) 46 { 47 size_t len = strlen (cwd); 48 memset (cwd + len, ' ', cwd_len - len); 49 err = 0; 50 } 51 else if (errno == ERANGE) 52 { 53 /* There is a possibility that the previous attempt failed due 54 to not enough space for the terminating null byte. Try again 55 with a buffer one char longer. */ 56 char *buf = xmalloc (cwd_len + 1); 57 if (getcwd (buf, cwd_len + 1)) 58 { 59 memcpy (cwd, buf, cwd_len); 60 err = 0; 61 } 62 else 63 err = errno; 64 free (buf); 65 } 66 else 67 err = errno; 68 if (err) 69 memset (cwd, ' ', cwd_len); 70 if (status != NULL) 71 *status = err; 72 } 73 iexport(getcwd_i4_sub); 74 75 extern void getcwd_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type); 76 export_proto(getcwd_i8_sub); 77 78 void 79 getcwd_i8_sub (char *cwd, GFC_INTEGER_8 *status, gfc_charlen_type cwd_len) 80 { 81 GFC_INTEGER_4 status4; 82 getcwd_i4_sub (cwd, &status4, cwd_len); 83 if (status) 84 *status = status4; 85 } 86 87 extern GFC_INTEGER_4 PREFIX(getcwd) (char *, gfc_charlen_type); 88 export_proto_np(PREFIX(getcwd)); 89 90 GFC_INTEGER_4 91 PREFIX(getcwd) (char *cwd, gfc_charlen_type cwd_len) 92 { 93 GFC_INTEGER_4 status; 94 getcwd_i4_sub (cwd, &status, cwd_len); 95 return status; 96 } 97 98 #endif 99