Contents of /trunk/mkinitrd-magellan/busybox/libbb/xgetcwd.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 995 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 | |
10 | #include "libbb.h" |
11 | |
12 | /* Amount to increase buffer size by in each try. */ |
13 | #define PATH_INCR 32 |
14 | |
15 | /* Return the current directory, newly allocated, arbitrarily long. |
16 | Return NULL and set errno on error. |
17 | If argument is not NULL (previous usage allocate memory), call free() |
18 | */ |
19 | |
20 | char * |
21 | xgetcwd(char *cwd) |
22 | { |
23 | char *ret; |
24 | unsigned path_max; |
25 | |
26 | path_max = (unsigned) PATH_MAX; |
27 | path_max += 2; /* The getcwd docs say to do this. */ |
28 | |
29 | if (cwd==0) |
30 | cwd = xmalloc(path_max); |
31 | |
32 | while ((ret = getcwd(cwd, path_max)) == NULL && errno == ERANGE) { |
33 | path_max += PATH_INCR; |
34 | cwd = xrealloc(cwd, path_max); |
35 | } |
36 | |
37 | if (ret == NULL) { |
38 | free(cwd); |
39 | bb_perror_msg("getcwd"); |
40 | return NULL; |
41 | } |
42 | |
43 | return cwd; |
44 | } |