savedir.c revision 131555 
1/* savedir.c -- save the list of files in a directory in a string
2   Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software Foundation,
16   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17
18/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
19
20#if HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include <sys/types.h>
25
26#if HAVE_UNISTD_H
27# include <unistd.h>
28#endif
29
30#if HAVE_DIRENT_H
31# include <dirent.h>
32# define NAMLEN(dirent) strlen((dirent)->d_name)
33#else
34# define dirent direct
35# define NAMLEN(dirent) (dirent)->d_namlen
36# if HAVE_SYS_NDIR_H
37#  include <sys/ndir.h>
38# endif
39# if HAVE_SYS_DIR_H
40#  include <sys/dir.h>
41# endif
42# if HAVE_NDIR_H
43#  include <ndir.h>
44# endif
45#endif
46
47#ifdef CLOSEDIR_VOID
48/* Fake a return value. */
49# define CLOSEDIR(d) (closedir (d), 0)
50#else
51# define CLOSEDIR(d) closedir (d)
52#endif
53
54#ifdef STDC_HEADERS
55# include <stdlib.h>
56# include <string.h>
57#else
58char *malloc ();
59char *realloc ();
60#endif
61#ifndef NULL
62# define NULL 0
63#endif
64
65#ifndef stpcpy
66char *stpcpy ();
67#endif
68
69#include <fnmatch.h>
70#include "savedir.h"
71
72char *path;
73size_t pathlen;
74
75static int
76isdir1 (const char *dir, const char *file)
77{
78  int status;
79  int slash;
80  size_t dirlen = strlen (dir);
81  size_t filelen = strlen (file);
82  if ((dirlen + filelen + 2) > pathlen)
83    {
84      path = calloc (dirlen + 1 + filelen + 1, sizeof (*path));
85      pathlen = dirlen + filelen + 2;
86    }
87  strcpy (path, dir);
88  slash = (path[dirlen] != '/');
89  path[dirlen] = '/';
90  strcpy (path + dirlen + slash , file);
91  status  = isdir (path);
92  return status;
93}
94
95/* Return a freshly allocated string containing the filenames
96   in directory DIR, separated by '\0' characters;
97   the end is marked by two '\0' characters in a row.
98   NAME_SIZE is the number of bytes to initially allocate
99   for the string; it will be enlarged as needed.
100   Return NULL if DIR cannot be opened or if out of memory. */
101char *
102savedir (const char *dir, off_t name_size, struct exclude *included_patterns,
103	 struct exclude *excluded_patterns)
104{
105  DIR *dirp;
106  struct dirent *dp;
107  char *name_space;
108  char *namep;
109
110  dirp = opendir (dir);
111  if (dirp == NULL)
112    return NULL;
113
114  /* Be sure name_size is at least `1' so there's room for
115     the final NUL byte.  */
116  if (name_size <= 0)
117    name_size = 1;
118
119  name_space = (char *) malloc (name_size);
120  if (name_space == NULL)
121    {
122      closedir (dirp);
123      return NULL;
124    }
125  namep = name_space;
126
127  while ((dp = readdir (dirp)) != NULL)
128    {
129      /* Skip "." and ".." (some NFS filesystems' directories lack them). */
130      if (dp->d_name[0] != '.'
131	  || (dp->d_name[1] != '\0'
132	      && (dp->d_name[1] != '.' || dp->d_name[2] != '\0')))
133	{
134	  off_t size_needed = (namep - name_space) + NAMLEN (dp) + 2;
135
136	  if ((included_patterns || excluded_patterns)
137	      && !isdir1 (dir, dp->d_name))
138	    {
139	      if (included_patterns
140		  && !excluded_filename (included_patterns, dp->d_name, 0))
141		continue;
142	      if (excluded_patterns
143		  && excluded_filename (excluded_patterns, dp->d_name, 0))
144		continue;
145	    }
146
147	  if (size_needed > name_size)
148	    {
149	      char *new_name_space;
150
151	      while (size_needed > name_size)
152		name_size += 1024;
153
154	      new_name_space = realloc (name_space, name_size);
155	      if (new_name_space == NULL)
156		{
157		  closedir (dirp);
158		  return NULL;
159		}
160	      namep += new_name_space - name_space;
161	      name_space = new_name_space;
162	    }
163	  namep = stpcpy (namep, dp->d_name) + 1;
164	}
165    }
166  *namep = '\0';
167  if (CLOSEDIR (dirp))
168    {
169      free (name_space);
170      return NULL;
171    }
172  if (path)
173    {
174      free (path);
175      path = NULL;
176      pathlen = 0;
177    }
178  return name_space;
179}
180