From 8a633268ef478a31bd649d582ce07e9c26a4a03a Mon Sep 17 00:00:00 2001 From: Mark Whitley Date: Mon, 30 Apr 2001 18:17:00 +0000 Subject: Made new xreadlink function for libbb and changed applets to use it instead of readlink(2). --- libbb/xreadlink.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 libbb/xreadlink.c (limited to 'libbb/xreadlink.c') diff --git a/libbb/xreadlink.c b/libbb/xreadlink.c new file mode 100644 index 000000000..66f63b883 --- /dev/null +++ b/libbb/xreadlink.c @@ -0,0 +1,34 @@ +/* + * xreadlink.c - safe implementation of readlink + */ + +#include + +/* + * NOTE: This function returns a malloced char* that you will have to free + * yourself. You have been warned. + */ + +#include +#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); + } + while (bufsize < readsize + 1); + + buf[readsize] = '\0'; + + return buf; +} + -- cgit v1.2.3