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#include <sys/cdefs.h>
21__FBSDID("$FreeBSD$");
22
23#if HAVE_CONFIG_H
24# include <config.h>
25#endif
26
27#include <sys/types.h>
28
29#if HAVE_UNISTD_H
30# include <unistd.h>
31#endif
32
33#if HAVE_DIRENT_H
34# include <dirent.h>
35# define NAMLEN(dirent) strlen((dirent)->d_name)
36#else
37# define dirent direct
38# define NAMLEN(dirent) (dirent)->d_namlen
39# if HAVE_SYS_NDIR_H
40#  include <sys/ndir.h>
41# endif
42# if HAVE_SYS_DIR_H
43#  include <sys/dir.h>
44# endif
45# if HAVE_NDIR_H
46#  include <ndir.h>
47# endif
48#endif
49
50#ifdef CLOSEDIR_VOID
51/* Fake a return value. */
52# define CLOSEDIR(d) (closedir (d), 0)
53#else
54# define CLOSEDIR(d) closedir (d)
55#endif
56
57#ifdef STDC_HEADERS
58# include <stdlib.h>
59# include <string.h>
60#else
61char *malloc ();
62char *realloc ();
63#endif
64#ifndef NULL
65# define NULL 0
66#endif
67
68#ifndef stpcpy
69char *stpcpy ();
70#endif
71
72#include <fnmatch.h>
73#include "savedir.h"
74#include "system.h"
75
76char *path;
77size_t pathlen;
78
79static int
80isdir1 (const char *dir, const char *file)
81{
82  int status;
83  int slash;
84  size_t dirlen = strlen (dir);
85  size_t filelen = strlen (file);
86  if ((dirlen + filelen + 2) > pathlen)
87    {
88      path = calloc (dirlen + 1 + filelen + 1, sizeof (*path));
89      pathlen = dirlen + filelen + 2;
90    }
91  strcpy (path, dir);
92  slash = (path[dirlen] != '/');
93  path[dirlen] = '/';
94  strcpy (path + dirlen + slash , file);
95  status  = isdir (path);
96  return status;
97}
98
99/* Return a freshly allocated string containing the filenames
100   in directory DIR, separated by '\0' characters;
101   the end is marked by two '\0' characters in a row.
102   NAME_SIZE is the number of bytes to initially allocate
103   for the string; it will be enlarged as needed.
104   Return NULL if DIR cannot be opened or if out of memory. */
105char *
106savedir (const char *dir, off_t name_size, struct exclude *included_patterns,
107	 struct exclude *excluded_patterns)
108{
109  DIR *dirp;
110  struct dirent *dp;
111  char *name_space;
112  char *namep;
113
114  dirp = opendir (dir);
115  if (dirp == NULL)
116    return NULL;
117
118  /* Be sure name_size is at least `1' so there's room for
119     the final NUL byte.  */
120  if (name_size <= 0)
121    name_size = 1;
122
123  name_space = (char *) malloc (name_size);
124  if (name_space == NULL)
125    {
126      closedir (dirp);
127      return NULL;
128    }
129  namep = name_space;
130
131  while ((dp = readdir (dirp)) != NULL)
132    {
133      /* Skip "." and ".." (some NFS filesystems' directories lack them). */
134      if (dp->d_name[0] != '.'
135	  || (dp->d_name[1] != '\0'
136	      && (dp->d_name[1] != '.' || dp->d_name[2] != '\0')))
137	{
138	  off_t size_needed = (namep - name_space) + NAMLEN (dp) + 2;
139
140	  if ((included_patterns || excluded_patterns)
141	      && !isdir1 (dir, dp->d_name))
142	    {
143	      if (included_patterns
144		  && !excluded_filename (included_patterns, path, 0))
145		continue;
146	      if (excluded_patterns
147		  && excluded_filename (excluded_patterns, path, 0))
148		continue;
149	    }
150
151	  if (size_needed > name_size)
152	    {
153	      char *new_name_space;
154
155	      while (size_needed > name_size)
156		name_size += 1024;
157
158	      new_name_space = realloc (name_space, name_size);
159	      if (new_name_space == NULL)
160		{
161		  closedir (dirp);
162		  return NULL;
163		}
164	      namep += new_name_space - name_space;
165	      name_space = new_name_space;
166	    }
167	  namep = stpcpy (namep, dp->d_name) + 1;
168	}
169    }
170  *namep = '\0';
171  if (CLOSEDIR (dirp))
172    {
173      free (name_space);
174      return NULL;
175    }
176  if (path)
177    {
178      free (path);
179      path = NULL;
180      pathlen = 0;
181    }
182  return name_space;
183}
184