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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * xgetcwd.c -- return current directory with unlimited length
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4 | * Copyright (C) 1992, 1996 Free Software Foundation, Inc.
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5 | * Written by David MacKenzie <djm@gnu.ai.mit.edu>.
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6 | *
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7 | * Special function for busybox written by Vladimir Oleynik <dzo@simtreas.ru>
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | /* Amount to increase buffer size by in each try. */
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13 | #define PATH_INCR 32
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14 |
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15 | /* Return the current directory, newly allocated, arbitrarily long.
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16 | Return NULL and set errno on error.
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17 | If argument is not NULL (previous usage allocate memory), call free()
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18 | */
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19 |
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20 | char *
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21 | xrealloc_getcwd_or_warn(char *cwd)
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22 | {
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23 | char *ret;
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24 | unsigned path_max;
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25 |
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26 | path_max = (unsigned) PATH_MAX;
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27 | path_max += 2; /* The getcwd docs say to do this. */
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28 |
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29 | if (cwd == NULL)
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30 | cwd = xmalloc(path_max);
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31 |
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32 | while ((ret = getcwd(cwd, path_max)) == NULL && errno == ERANGE) {
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33 | path_max += PATH_INCR;
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34 | cwd = xrealloc(cwd, path_max);
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35 | }
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36 |
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37 | if (ret == NULL) {
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38 | free(cwd);
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39 | bb_perror_msg("getcwd");
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40 | return NULL;
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41 | }
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42 |
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43 | return cwd;
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44 | }
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