53 lines
894 B
C
53 lines
894 B
C
// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
|
|
#ifndef SHADOW_INCLUDE_LIB_FS_READLINK_AREADLINK_H_
|
|
#define SHADOW_INCLUDE_LIB_FS_READLINK_AREADLINK_H_
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "alloc/malloc.h"
|
|
#include "attr.h"
|
|
#include "fs/readlink/readlinknul.h"
|
|
|
|
|
|
ATTR_STRING(1)
|
|
inline char *areadlink(const char *link);
|
|
|
|
|
|
// Similar to readlink(2), but allocate and terminate the string.
|
|
inline char *
|
|
areadlink(const char *link)
|
|
{
|
|
size_t size = PATH_MAX;
|
|
|
|
while (true) {
|
|
int len;
|
|
char *buf;
|
|
|
|
buf = MALLOC(size, char);
|
|
if (NULL == buf)
|
|
return NULL;
|
|
|
|
len = readlinknul(link, buf, size);
|
|
if (len != -1)
|
|
return buf;
|
|
|
|
free(buf);
|
|
if (errno != E2BIG)
|
|
return NULL;
|
|
|
|
size *= 2;
|
|
}
|
|
}
|
|
|
|
|
|
#endif // include guard
|