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1 /* Implementation of the GETCWD intrinsic.
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2 Copyright (C) 2004-2020 Free Software Foundation, Inc.
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3 Contributed by Steven G. Kargl <kargls@comcast.net>.
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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 #include <errno.h>
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30
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31 #ifdef HAVE_UNISTD_H
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32 #include <unistd.h>
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33 #endif
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34
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35 #ifdef HAVE_GETCWD
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36
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37 extern void getcwd_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
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38 iexport_proto(getcwd_i4_sub);
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39
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40 void
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41 getcwd_i4_sub (char *cwd, GFC_INTEGER_4 *status, gfc_charlen_type cwd_len)
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42 {
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43 int err;
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44
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45 if (getcwd (cwd, cwd_len))
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46 {
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47 size_t len = strlen (cwd);
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48 memset (cwd + len, ' ', cwd_len - len);
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49 err = 0;
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50 }
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51 else if (errno == ERANGE)
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52 {
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53 /* There is a possibility that the previous attempt failed due
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54 to not enough space for the terminating null byte. Try again
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55 with a buffer one char longer. */
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56 char *buf = xmalloc (cwd_len + 1);
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57 if (getcwd (buf, cwd_len + 1))
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58 {
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59 memcpy (cwd, buf, cwd_len);
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60 err = 0;
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61 }
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62 else
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63 err = errno;
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64 free (buf);
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65 }
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66 else
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67 err = errno;
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68 if (err)
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69 memset (cwd, ' ', cwd_len);
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70 if (status != NULL)
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71 *status = err;
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72 }
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73 iexport(getcwd_i4_sub);
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74
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75 extern void getcwd_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
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76 export_proto(getcwd_i8_sub);
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77
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78 void
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79 getcwd_i8_sub (char *cwd, GFC_INTEGER_8 *status, gfc_charlen_type cwd_len)
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80 {
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81 GFC_INTEGER_4 status4;
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82 getcwd_i4_sub (cwd, &status4, cwd_len);
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83 if (status)
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84 *status = status4;
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85 }
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86
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87 extern GFC_INTEGER_4 PREFIX(getcwd) (char *, gfc_charlen_type);
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88 export_proto_np(PREFIX(getcwd));
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89
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90 GFC_INTEGER_4
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91 PREFIX(getcwd) (char *cwd, gfc_charlen_type cwd_len)
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92 {
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93 GFC_INTEGER_4 status;
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94 getcwd_i4_sub (cwd, &status, cwd_len);
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95 return status;
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96 }
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97
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98 #endif
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