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author | ticktock35 <ticktock35@e8e0d7a0-c8d9-11dd-a880-a1081c7ac358> | 2008-12-14 23:10:56 (EST) |
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committer | ticktock35 <ticktock35@e8e0d7a0-c8d9-11dd-a880-a1081c7ac358> | 2008-12-14 23:10:56 (EST) |
commit | 8bf49d16a637cca0cd116450dfcabc4c941baf6c (patch) | |
tree | bea96583e7a63f1b87ad4ef07b191f121348fe78 /libbb/xreadlink.c | |
parent | 4074befd4db12e78af74f7e1438459125b0b3016 (diff) |
* Add ipkg for future development
git-svn-id: http://opkg.googlecode.com/svn/trunk@3 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358
Diffstat (limited to 'libbb/xreadlink.c')
-rw-r--r-- | libbb/xreadlink.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libbb/xreadlink.c b/libbb/xreadlink.c new file mode 100644 index 0000000..932e487 --- /dev/null +++ b/libbb/xreadlink.c @@ -0,0 +1,37 @@ +/* + * xreadlink.c - safe implementation of readlink. + * Returns a NULL on failure... + */ + +#include <stdio.h> + +/* + * NOTE: This function returns a malloced char* that you will have to free + * yourself. You have been warned. + */ + +#include <unistd.h> +#include "libbb.h" + +extern char *xreadlink(const char *path) +{ + static const int GROWBY = 80; /* how large we will grow strings by */ + + char *buf = NULL; + int bufsize = 0, readsize = 0; + + do { + buf = xrealloc(buf, bufsize += GROWBY); + readsize = readlink(path, buf, bufsize); /* 1st try */ + if (readsize == -1) { + perror_msg("%s:%s", applet_name, path); + return NULL; + } + } + while (bufsize < readsize + 1); + + buf[readsize] = '\0'; + + return buf; +} + |