source: MondoRescue/branches/stable/mindi-busybox/libbb/xgetcwd.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.1 KB
Line 
1/*
2 * xgetcwd.c -- return current directory with unlimited length
3 * Copyright (C) 1992, 1996 Free Software Foundation, Inc.
4 * Written by David MacKenzie <djm@gnu.ai.mit.edu>.
5 *
6 * Special function for busybox written by Vladimir Oleynik <dzo@simtreas.ru>
7*/
8
9#include <stdlib.h>
10#include <errno.h>
11#include <unistd.h>
12#include <limits.h>
13#include <sys/param.h>
14#include "libbb.h"
15
16/* Amount to increase buffer size by in each try. */
17#define PATH_INCR 32
18
19/* Return the current directory, newly allocated, arbitrarily long.
20   Return NULL and set errno on error.
21   If argument is not NULL (previous usage allocate memory), call free()
22*/
23
24char *
25xgetcwd (char *cwd)
26{
27  char *ret;
28  unsigned path_max;
29
30  path_max = (unsigned) PATH_MAX;
31  path_max += 2;                /* The getcwd docs say to do this. */
32
33  if(cwd==0)
34    cwd = xmalloc (path_max);
35
36  while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE) {
37      path_max += PATH_INCR;
38      cwd = xrealloc (cwd, path_max);
39  }
40
41  if (ret == NULL) {
42      free (cwd);
43      bb_perror_msg("getcwd()");
44      return NULL;
45  }
46
47  return cwd;
48}
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