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;
+}       
+