Contents of /tags/mkinitrd-6_2_3/busybox/libbb/xgetcwd.c
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Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
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Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 1023 byte(s)
tagged 'mkinitrd-6_2_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * xgetcwd.c -- return current directory with unlimited length |
4 | * Copyright (C) 1992, 1996 Free Software Foundation, Inc. |
5 | * Written by David MacKenzie <djm@gnu.ai.mit.edu>. |
6 | * |
7 | * Special function for busybox written by Vladimir Oleynik <dzo@simtreas.ru> |
8 | * |
9 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | #include "libbb.h" |
13 | |
14 | /* Return the current directory, newly allocated, arbitrarily long. |
15 | Return NULL and set errno on error. |
16 | If argument is not NULL (previous usage allocate memory), call free() |
17 | */ |
18 | |
19 | char* FAST_FUNC |
20 | xrealloc_getcwd_or_warn(char *cwd) |
21 | { |
22 | #define PATH_INCR 64 |
23 | |
24 | char *ret; |
25 | unsigned path_max; |
26 | |
27 | path_max = 128; /* 128 + 64 should be enough for 99% of cases */ |
28 | |
29 | while (1) { |
30 | path_max += PATH_INCR; |
31 | cwd = xrealloc(cwd, path_max); |
32 | ret = getcwd(cwd, path_max); |
33 | if (ret == NULL) { |
34 | if (errno == ERANGE) |
35 | continue; |
36 | free(cwd); |
37 | bb_perror_msg("getcwd"); |
38 | return NULL; |
39 | } |
40 | cwd = xrealloc(cwd, strlen(cwd) + 1); |
41 | return cwd; |
42 | } |
43 | } |