OpenCores
URL https://opencores.org/ocsvn/open8_urisc/open8_urisc/trunk

Subversion Repositories open8_urisc

[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [libiberty/] [lrealpath.c] - Blame information for rev 84

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 21 khays
/* Libiberty realpath.  Like realpath, but more consistent behavior.
2
   Based on gdb_realpath from GDB.
3
 
4
   Copyright 2003 Free Software Foundation, Inc.
5
 
6
   This file is part of the libiberty library.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 2 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program; if not, write to the Free Software
20
   Foundation, Inc., 51 Franklin Street - Fifth Floor,
21
   Boston, MA 02110-1301, USA.  */
22
 
23
/*
24
 
25
@deftypefn Replacement {const char*} lrealpath (const char *@var{name})
26
 
27
Given a pointer to a string containing a pathname, returns a canonical
28
version of the filename.  Symlinks will be resolved, and ``.'' and ``..''
29
components will be simplified.  The returned value will be allocated using
30
@code{malloc}, or @code{NULL} will be returned on a memory allocation error.
31
 
32
@end deftypefn
33
 
34
*/
35
 
36
#include "config.h"
37
#include "ansidecl.h"
38
#include "libiberty.h"
39
 
40
#ifdef HAVE_LIMITS_H
41
#include <limits.h>
42
#endif
43
#ifdef HAVE_STDLIB_H
44
#include <stdlib.h>
45
#endif
46
#ifdef HAVE_UNISTD_H
47
#include <unistd.h>
48
#endif
49
#ifdef HAVE_STRING_H
50
#include <string.h>
51
#endif
52
 
53
/* On GNU libc systems the declaration is only visible with _GNU_SOURCE.  */
54
#if defined(HAVE_CANONICALIZE_FILE_NAME) \
55
    && defined(NEED_DECLARATION_CANONICALIZE_FILE_NAME)
56
extern char *canonicalize_file_name (const char *);
57
#endif
58
 
59
#if defined(HAVE_REALPATH)
60
# if defined (PATH_MAX)
61
#  define REALPATH_LIMIT PATH_MAX
62
# else
63
#  if defined (MAXPATHLEN)
64
#   define REALPATH_LIMIT MAXPATHLEN
65
#  endif
66
# endif
67
#else
68
  /* cygwin has realpath, so it won't get here.  */
69
# if defined (_WIN32)
70
#  define WIN32_LEAN_AND_MEAN
71
#  include <windows.h> /* for GetFullPathName */
72
# endif
73
#endif
74
 
75
char *
76
lrealpath (const char *filename)
77
{
78
  /* Method 1: The system has a compile time upper bound on a filename
79
     path.  Use that and realpath() to canonicalize the name.  This is
80
     the most common case.  Note that, if there isn't a compile time
81
     upper bound, you want to avoid realpath() at all costs.  */
82
#if defined(REALPATH_LIMIT)
83
  {
84
    char buf[REALPATH_LIMIT];
85
    const char *rp = realpath (filename, buf);
86
    if (rp == NULL)
87
      rp = filename;
88
    return strdup (rp);
89
  }
90
#endif /* REALPATH_LIMIT */
91
 
92
  /* Method 2: The host system (i.e., GNU) has the function
93
     canonicalize_file_name() which malloc's a chunk of memory and
94
     returns that, use that.  */
95
#if defined(HAVE_CANONICALIZE_FILE_NAME)
96
  {
97
    char *rp = canonicalize_file_name (filename);
98
    if (rp == NULL)
99
      return strdup (filename);
100
    else
101
      return rp;
102
  }
103
#endif
104
 
105
  /* Method 3: Now we're getting desperate!  The system doesn't have a
106
     compile time buffer size and no alternative function.  Query the
107
     OS, using pathconf(), for the buffer limit.  Care is needed
108
     though, some systems do not limit PATH_MAX (return -1 for
109
     pathconf()) making it impossible to pass a correctly sized buffer
110
     to realpath() (it could always overflow).  On those systems, we
111
     skip this.  */
112
#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H)
113
  {
114
    /* Find out the max path size.  */
115
    long path_max = pathconf ("/", _PC_PATH_MAX);
116
    if (path_max > 0)
117
      {
118
        /* PATH_MAX is bounded.  */
119
        char *buf, *rp, *ret;
120
        buf = (char *) malloc (path_max);
121
        if (buf == NULL)
122
          return NULL;
123
        rp = realpath (filename, buf);
124
        ret = strdup (rp ? rp : filename);
125
        free (buf);
126
        return ret;
127
      }
128
  }
129
#endif
130
 
131
  /* The MS Windows method.  If we don't have realpath, we assume we
132
     don't have symlinks and just canonicalize to a Windows absolute
133
     path.  GetFullPath converts ../ and ./ in relative paths to
134
     absolute paths, filling in current drive if one is not given
135
     or using the current directory of a specified drive (eg, "E:foo").
136
     It also converts all forward slashes to back slashes.  */
137
#if defined (_WIN32)
138
  {
139
    char buf[MAX_PATH];
140
    char* basename;
141
    DWORD len = GetFullPathName (filename, MAX_PATH, buf, &basename);
142
    if (len == 0 || len > MAX_PATH - 1)
143
      return strdup (filename);
144
    else
145
      {
146
        /* The file system is case-preserving but case-insensitive,
147
           Canonicalize to lowercase, using the codepage associated
148
           with the process locale.  */
149
        CharLowerBuff (buf, len);
150
        return strdup (buf);
151
      }
152
  }
153
#endif
154
 
155
  /* This system is a lost cause, just duplicate the filename.  */
156
  return strdup (filename);
157
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.