#include <errno.h>
#include <limits.h>
+#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "allocator.h"
-#if ! HAVE_READLINKAT
-/* Ignore FD. Get the symbolic link value of FILENAME and put it into
- BUFFER, with size BUFFER_SIZE. This function acts like readlink
- but has readlinkat's signature. */
+/* Get the symbolic link value of FILENAME and put it into BUFFER, with
+ size BUFFER_SIZE. This function acts like readlink but has
+ readlinkat's signature. */
ssize_t
careadlinkatcwd (int fd, char const *filename, char *buffer,
size_t buffer_size)
{
- (void) fd;
+ /* FD must be AT_FDCWD here, otherwise the caller is using this
+ function in contexts for which it was not meant for. */
+ if (fd != AT_FDCWD)
+ abort ();
return readlink (filename, buffer, buffer_size);
}
-#endif
/* Assuming the current directory is FD, get the symbolic link value
of FILENAME as a null-terminated string and put it into a buffer.
if (buf == stack_buf)
{
char *b = (char *) alloc->allocate (link_size);
+ buf_size = link_size;
if (! b)
break;
memcpy (b, buf, link_size);
buf_size *= 2;
else if (buf_size < buf_size_max)
buf_size = buf_size_max;
+ else if (buf_size_max < SIZE_MAX)
+ {
+ errno = ENAMETOOLONG;
+ return NULL;
+ }
else
break;
buf = (char *) alloc->allocate (buf_size);
while (buf);
if (alloc->die)
- alloc->die ();
+ alloc->die (buf_size);
errno = ENOMEM;
return NULL;
}