source: MondoRescue/branches/2.2.2/mindi-busybox/libbb/xreadlink.c@ 1247

/*
 *  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"

char *xreadlink(const char *path)
{
    enum { 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) {
            bb_perror_msg("%s", path);
            free(buf);
            return NULL;
        }
    }
    while (bufsize < readsize + 1);

    buf[readsize] = '\0';

    return buf;
}