diff options
Diffstat (limited to 'libbb/xreadlink.c')
-rw-r--r-- | libbb/xreadlink.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libbb/xreadlink.c b/libbb/xreadlink.c new file mode 100644 index 000000000..14863d9d5 --- /dev/null +++ b/libbb/xreadlink.c | |||
@@ -0,0 +1,38 @@ | |||
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 <stdio.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 | #include <unistd.h> | ||
15 | #include "libbb.h" | ||
16 | |||
17 | char *xreadlink(const char *path) | ||
18 | { | ||
19 | enum { GROWBY = 80 }; /* how large we will grow strings by */ | ||
20 | |||
21 | char *buf = NULL; | ||
22 | int bufsize = 0, readsize = 0; | ||
23 | |||
24 | do { | ||
25 | buf = xrealloc(buf, bufsize += GROWBY); | ||
26 | readsize = readlink(path, buf, bufsize); /* 1st try */ | ||
27 | if (readsize == -1) { | ||
28 | bb_perror_msg("%s", path); | ||
29 | free(buf); | ||
30 | return NULL; | ||
31 | } | ||
32 | } | ||
33 | while (bufsize < readsize + 1); | ||
34 | |||
35 | buf[readsize] = '\0'; | ||
36 | |||
37 | return buf; | ||
38 | } | ||