1/*
2 *  xreadlink.c - safe implementation of readlink.
3 *  Returns a NULL on failure...
4 */
5
6#include <stdio.h>
7
8/*
9 * NOTE: This function returns a malloced char* that you will have to free
10 * yourself. You have been warned.
11 */
12
13#include <unistd.h>
14#include "libbb.h"
15
16extern char *xreadlink(const char *path)
17{
18	static const int GROWBY = 80; /* how large we will grow strings by */
19
20	char *buf = NULL;
21	int bufsize = 0, readsize = 0;
22
23	do {
24		buf = xrealloc(buf, bufsize += GROWBY);
25		readsize = readlink(path, buf, bufsize); /* 1st try */
26		if (readsize == -1) {
27		    perror_msg("%s:%s", applet_name, path);
28		    return NULL;
29		}
30	}
31	while (bufsize < readsize + 1);
32
33	buf[readsize] = '\0';
34
35	return buf;
36}
37
38