source: MondoRescue/branches/stable/mindi-busybox/libbb/xreadlink.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 691 bytes
Line 
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
16char *xreadlink(const char *path)
17{
18    enum { 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            bb_perror_msg("%s", path);
28            free(buf);
29            return NULL;
30        }
31    }
32    while (bufsize < readsize + 1);
33
34    buf[readsize] = '\0';
35
36    return buf;
37}
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