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/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 2018-2024 Free Software Foundation, Inc.
GDBM 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, or (at your option)
any later version.
GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>. */
#include "gdbmtool.h"
struct instream_file
{
struct instream base; /* Base structure */
FILE *fp; /* Opened file */
dev_t dev; /* Device number */
ino_t ino; /* Inode number */
};
static ssize_t
instream_file_read (instream_t istr, char *buf, size_t size)
{
struct instream_file *file = (struct instream_file *)istr;
return fread (buf, 1, size, file->fp);
}
static void
instream_file_close (instream_t istr)
{
struct instream_file *file = (struct instream_file *)istr;
fclose (file->fp);
free (file->base.in_name);
free (file);
}
static int
instream_file_eq (instream_t a, instream_t b)
{
struct instream_file *file_a = (struct instream_file *)a;
struct instream_file *file_b = (struct instream_file *)b;
return file_a->dev == file_b->dev && file_a->ino == file_b->ino;
}
instream_t
instream_file_create (char const *name)
{
struct instream_file *istr;
struct stat st;
FILE *fp;
if (stat (name, &st))
{
terror (_("cannot open `%s': %s"), name, strerror (errno));
return NULL;
}
else if (!S_ISREG (st.st_mode))
{
terror (_("%s is not a regular file"), name);
return NULL;
}
fp = fopen (name, "r");
if (!fp)
{
terror (_("cannot open %s for reading: %s"), name,
strerror (errno));
return NULL;
}
istr = emalloc (sizeof *istr);
istr->base.in_name = estrdup (name);
istr->base.in_inter = 0;
istr->base.in_read = instream_file_read;
istr->base.in_close = instream_file_close;
istr->base.in_eq = instream_file_eq;
istr->base.in_history_size = NULL;
istr->base.in_history_get = NULL;
istr->fp = fp;
istr->dev = st.st_dev;
istr->ino = st.st_ino;
return (instream_t) istr;
}
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