1 | /* xgetcwd.c -- return current directory with unlimited length |
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2 | Copyright (C) 1992, 1996, 2000 Free Software Foundation, Inc. |
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3 | |
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4 | This program is free software; you can redistribute it and/or modify |
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5 | it under the terms of the GNU General Public License as published by |
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6 | the Free Software Foundation; either version 2, or (at your option) |
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7 | any later version. |
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8 | |
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9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | GNU General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU General Public License |
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15 | along with this program; if not, write to the Free Software Foundation, |
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16 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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17 | |
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18 | /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | # include <config.h> |
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22 | #endif |
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23 | |
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24 | #include <stdio.h> |
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25 | #include <errno.h> |
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26 | #ifndef errno |
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27 | extern int errno; |
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28 | #endif |
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29 | |
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30 | #include <sys/types.h> |
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31 | #include "pathmax.h" |
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32 | |
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33 | #if HAVE_GETCWD |
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34 | char *getcwd (); |
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35 | #else |
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36 | char *getwd (); |
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37 | # define getcwd(Buf, Max) getwd (Buf) |
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38 | #endif |
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39 | |
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40 | extern void *xmalloc (); |
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41 | extern char *xstrdup (); |
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42 | extern void free (); |
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43 | |
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44 | /* Return the current directory, newly allocated, arbitrarily long. |
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45 | Return NULL and set errno on error. */ |
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46 | |
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47 | char * |
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48 | xgetcwd () |
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49 | { |
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50 | char *ret; |
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51 | unsigned path_max; |
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52 | char buf[1024]; |
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53 | |
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54 | errno = 0; |
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55 | ret = getcwd (buf, sizeof (buf)); |
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56 | if (ret != NULL) |
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57 | return xstrdup (buf); |
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58 | if (errno != ERANGE) |
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59 | return NULL; |
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60 | |
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61 | path_max = (unsigned) PATH_MAX; |
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62 | path_max += 2; /* The getcwd docs say to do this. */ |
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63 | |
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64 | for (;;) |
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65 | { |
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66 | char *cwd = (char *) xmalloc (path_max); |
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67 | |
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68 | errno = 0; |
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69 | ret = getcwd (cwd, path_max); |
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70 | if (ret != NULL) |
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71 | return ret; |
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72 | if (errno != ERANGE) |
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73 | { |
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74 | int save_errno = errno; |
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75 | free (cwd); |
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76 | errno = save_errno; |
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77 | return NULL; |
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78 | } |
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79 | |
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80 | free (cwd); |
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81 | |
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82 | path_max += path_max / 16; |
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83 | path_max += 32; |
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84 | } |
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85 | } |
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