1
/* Read, sort and compare two directories. Used for GNU DIFF.
2
Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
4
This file is part of GNU DIFF.
6
GNU DIFF is free software; you can redistribute it and/or modify
7
it under the terms of the GNU General Public License as published by
8
the Free Software Foundation; either version 2, or (at your option)
11
GNU DIFF is distributed in the hope that it will be useful,
12
but WITHOUT ANY WARRANTY; without even the implied warranty of
13
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
GNU General Public License for more details.
16
You should have received a copy of the GNU General Public License
17
along with GNU DIFF; see the file COPYING. If not, write to
18
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
22
/* Read the directory named by DIR and store into DIRDATA a sorted vector
23
of filenames for its contents. DIR->desc == -1 means this directory is
24
known to be nonexistent, so set DIRDATA to an empty vector.
25
Return -1 (setting errno) if error, 0 otherwise. */
29
char const **names; /* Sorted names of files in dir, 0-terminated. */
30
char *data; /* Allocated storage for file names. */
33
static int compare_names PARAMS((void const *, void const *));
34
static int dir_sort PARAMS((struct file_data const *, struct dirdata *));
37
dir_sort (dir, dirdata)
38
struct file_data const *dir;
39
struct dirdata *dirdata;
41
register struct dirent *next;
44
/* Address of block containing the files that are described. */
47
/* Number of files in directory. */
50
/* Allocated and used storage for file name data. */
52
size_t data_alloc, data_used;
61
/* Open the directory and check for errors. */
62
register DIR *reading = opendir (dir->name);
66
/* Initialize the table of filenames. */
68
data_alloc = max (1, (size_t) dir->stat.st_size);
70
dirdata->data = data = xmalloc (data_alloc);
72
/* Read the directory entries, and insert the subfiles
73
into the `data' table. */
75
while ((errno = 0, (next = readdir (reading)) != 0))
77
char *d_name = next->d_name;
78
size_t d_size = NAMLEN (next) + 1;
80
/* Ignore the files `.' and `..' */
82
&& (d_name[1] == 0 || (d_name[1] == '.' && d_name[2] == 0)))
85
if (excluded_filename (d_name))
88
while (data_alloc < data_used + d_size)
89
dirdata->data = data = xrealloc (data, data_alloc *= 2);
90
memcpy (data + data_used, d_name, d_size);
104
if (closedir (reading) != 0)
109
/* Create the `names' table from the `data' table. */
110
dirdata->names = names = (char const **) xmalloc (sizeof (char *)
112
for (i = 0; i < nnames; i++)
115
data += strlen (data) + 1;
119
/* Sort the table. */
120
qsort (names, nnames, sizeof (char *), compare_names);
125
/* Sort the files now in the table. */
128
compare_names (file1, file2)
129
void const *file1, *file2;
131
return filename_cmp (* (char const *const *) file1,
132
* (char const *const *) file2);
135
/* Compare the contents of two directories named in FILEVEC[0] and FILEVEC[1].
136
This is a top-level routine; it does everything necessary for diff
139
FILEVEC[0].desc == -1 says directory FILEVEC[0] doesn't exist,
140
but pretend it is empty. Likewise for FILEVEC[1].
142
HANDLE_FILE is a caller-provided subroutine called to handle each file.
143
It gets five operands: dir and name (rel to original working dir) of file
144
in dir 0, dir and name pathname of file in dir 1, and the recursion depth.
146
For a file that appears in only one of the dirs, one of the name-args
147
to HANDLE_FILE is zero.
149
DEPTH is the current depth in recursion, used for skipping top-level
150
files by the -S option.
152
Returns the maximum of all the values returned by HANDLE_FILE,
153
or 2 if trouble is encountered in opening files. */
156
diff_dirs (filevec, handle_file, depth)
157
struct file_data const filevec[];
158
int (*handle_file) PARAMS((char const *, char const *, char const *, char const *, int));
161
struct dirdata dirdata[2];
162
int val = 0; /* Return value. */
165
/* Get sorted contents of both dirs. */
166
for (i = 0; i < 2; i++)
167
if (dir_sort (&filevec[i], &dirdata[i]) != 0)
169
perror_with_name (filevec[i].name);
175
register char const * const *names0 = dirdata[0].names;
176
register char const * const *names1 = dirdata[1].names;
177
char const *name0 = filevec[0].name;
178
char const *name1 = filevec[1].name;
180
/* If `-S name' was given, and this is the topmost level of comparison,
181
ignore all file names less than the specified starting name. */
183
if (dir_start_file && depth == 0)
185
while (*names0 && filename_cmp (*names0, dir_start_file) < 0)
187
while (*names1 && filename_cmp (*names1, dir_start_file) < 0)
191
/* Loop while files remain in one or both dirs. */
192
while (*names0 || *names1)
194
/* Compare next name in dir 0 with next name in dir 1.
196
pretend the "next name" in that dir is very large. */
197
int nameorder = (!*names0 ? 1 : !*names1 ? -1
198
: filename_cmp (*names0, *names1));
199
int v1 = (*handle_file) (name0, 0 < nameorder ? 0 : *names0++,
200
name1, nameorder < 0 ? 0 : *names1++,
207
for (i = 0; i < 2; i++)
209
if (dirdata[i].names)
210
free (dirdata[i].names);
212
free (dirdata[i].data);