Contents of /trunk/mkinitrd-magellan/busybox/libbb/xreadlink.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 973 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 973 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 | * xreadlink.c - safe implementation of readlink. |
4 | * Returns a NULL on failure... |
5 | */ |
6 | |
7 | #include "libbb.h" |
8 | |
9 | /* |
10 | * NOTE: This function returns a malloced char* that you will have to free |
11 | * yourself. You have been warned. |
12 | */ |
13 | |
14 | char *xreadlink(const char *path) |
15 | { |
16 | enum { GROWBY = 80 }; /* how large we will grow strings by */ |
17 | |
18 | char *buf = NULL; |
19 | int bufsize = 0, readsize = 0; |
20 | |
21 | do { |
22 | buf = xrealloc(buf, bufsize += GROWBY); |
23 | readsize = readlink(path, buf, bufsize); /* 1st try */ |
24 | if (readsize == -1) { |
25 | bb_perror_msg("%s", path); |
26 | free(buf); |
27 | return NULL; |
28 | } |
29 | } |
30 | while (bufsize < readsize + 1); |
31 | |
32 | buf[readsize] = '\0'; |
33 | |
34 | return buf; |
35 | } |
36 | |
37 | char *xmalloc_realpath(const char *path) |
38 | { |
39 | #if defined(__GLIBC__) && !defined(__UCLIBC__) |
40 | /* glibc provides a non-standard extension */ |
41 | return realpath(path, NULL); |
42 | #else |
43 | char buf[PATH_MAX+1]; |
44 | |
45 | /* on error returns NULL (xstrdup(NULL) ==NULL) */ |
46 | return xstrdup(realpath(path, buf)); |
47 | #endif |
48 | } |