mirror of
https://git.proxmox.com/git/grub2
synced 2025-10-31 19:15:14 +00:00
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/* Copyright (C) 2011-2019 Free Software Foundation, Inc.
|
|
This file is part of gnulib.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification */
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#if GNULIB_GETCWD
|
|
/* Favor GPL getcwd.c if both getcwd and getcwd-lgpl modules are in use. */
|
|
typedef int dummy;
|
|
#else
|
|
|
|
/* Get the name of the current working directory, and put it in SIZE
|
|
bytes of BUF. Returns NULL if the directory couldn't be determined
|
|
(perhaps because the absolute name was longer than PATH_MAX, or
|
|
because of missing read/search permissions on parent directories)
|
|
or SIZE was too small. If successful, returns BUF. If BUF is
|
|
NULL, an array is allocated with 'malloc'; the array is SIZE bytes
|
|
long, unless SIZE == 0, in which case it is as big as
|
|
necessary. */
|
|
|
|
# undef getcwd
|
|
char *
|
|
rpl_getcwd (char *buf, size_t size)
|
|
{
|
|
char *ptr;
|
|
char *result;
|
|
|
|
/* Handle single size operations. */
|
|
if (buf)
|
|
{
|
|
if (!size)
|
|
{
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
return getcwd (buf, size);
|
|
}
|
|
|
|
if (size)
|
|
{
|
|
buf = malloc (size);
|
|
if (!buf)
|
|
{
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
result = getcwd (buf, size);
|
|
if (!result)
|
|
{
|
|
int saved_errno = errno;
|
|
free (buf);
|
|
errno = saved_errno;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* Flexible sizing requested. Avoid over-allocation for the common
|
|
case of a name that fits within a 4k page, minus some space for
|
|
local variables, to be sure we don't skip over a guard page. */
|
|
{
|
|
char tmp[4032];
|
|
size = sizeof tmp;
|
|
ptr = getcwd (tmp, size);
|
|
if (ptr)
|
|
{
|
|
result = strdup (ptr);
|
|
if (!result)
|
|
errno = ENOMEM;
|
|
return result;
|
|
}
|
|
if (errno != ERANGE)
|
|
return NULL;
|
|
}
|
|
|
|
/* My what a large directory name we have. */
|
|
do
|
|
{
|
|
size <<= 1;
|
|
ptr = realloc (buf, size);
|
|
if (ptr == NULL)
|
|
{
|
|
free (buf);
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
buf = ptr;
|
|
result = getcwd (buf, size);
|
|
}
|
|
while (!result && errno == ERANGE);
|
|
|
|
if (!result)
|
|
{
|
|
int saved_errno = errno;
|
|
free (buf);
|
|
errno = saved_errno;
|
|
}
|
|
else
|
|
{
|
|
/* Trim to fit, if possible. */
|
|
result = realloc (buf, strlen (buf) + 1);
|
|
if (!result)
|
|
result = buf;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif
|