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getcwd-lgpl.c
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getcwd-lgpl.c
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/* Copyright (C) 2011 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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification */
#include <unistd.h>
#include <errno.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

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