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/* Specialized functions to manipulate a set of files.
Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
#include "file-set.h"
#include "hash-triple.h"
#include "xalloc.h"
/* Record file, FILE, and dev/ino from *STATS, in the hash table, HT.
If HT is NULL, return immediately.
If memory allocation fails, exit immediately. */
void
record_file (Hash_table *ht, char const *file, struct stat const *stats)
{
struct F_triple *ent;
if (ht == NULL)
return;
ent = xmalloc (sizeof *ent);
ent->name = xstrdup (file);
ent->st_ino = stats->st_ino;
ent->st_dev = stats->st_dev;
{
struct F_triple *ent_from_table = hash_insert (ht, ent);
if (ent_from_table == NULL)
{
/* Insertion failed due to lack of memory. */
xalloc_die ();
}
if (ent_from_table != ent)
{
/* There was alread a matching entry in the table, so ENT was
not inserted. Free it. */
triple_free (ent);
}
}
}
/* Return true if there is an entry in hash table, HT,
for the file described by FILE and STATS. */
bool
seen_file (Hash_table const *ht, char const *file,
struct stat const *stats)
{
struct F_triple new_ent;
if (ht == NULL)
return false;
new_ent.name = (char *) file;
new_ent.st_ino = stats->st_ino;
new_ent.st_dev = stats->st_dev;
return !!hash_lookup (ht, &new_ent);
}
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