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/*
* fhist - file history and comparison tools
* Copyright (C) 2000, 2002, 2008, 2010, 2012 Peter Miller
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <common/ac/unistd.h>
#include <libexplain/fclose.h>
#include <libexplain/fopen.h>
#include <libexplain/fread.h>
#include <libexplain/getc.h>
#include <libexplain/lstat.h>
#include <libexplain/stat.h>
#include <common/error.h>
#include <common/fcheck.h>
#include <common/input/file.h>
#include <common/input/private.h>
#include <common/input/stdin.h>
#include <common/str.h>
#include <common/error_intl.h>
typedef struct input_file_ty input_file_ty;
struct input_file_ty
{
input_ty inherited;
FILE *fp;
string_ty *fn;
int unlink_on_close;
long pos;
};
static void
destruct(input_ty *p)
{
input_file_ty *this;
this = (input_file_ty *)p;
explain_fclose_or_die(this->fp);
this->fp = 0;
if (this->unlink_on_close)
unlink(this->fn->str_text);
str_free(this->fn);
this->fn = 0;
}
static long
iread(input_ty *p, void *data, long len)
{
input_file_ty *this;
long result;
if (len < 0)
return 0;
this = (input_file_ty *)p;
result = explain_fread_or_die(data, (size_t)1, (size_t)len, this->fp);
this->pos += result;
return result;
}
static int
get(input_ty *p)
{
input_file_ty *this;
int c;
this = (input_file_ty *)p;
c = explain_getc_or_die(this->fp);
if (c != EOF)
this->pos++;
return c;
}
static long
itell(input_ty *p)
{
input_file_ty *this;
this = (input_file_ty *)p;
return this->pos;
}
static const char *
name(input_ty *p)
{
input_file_ty *this;
this = (input_file_ty *)p;
return this->fn->str_text;
}
static long
length(input_ty *p)
{
input_file_ty *this;
struct stat st;
this = (input_file_ty *)p;
#ifdef S_IFLNK
explain_lstat_or_die(this->fn->str_text, &st);
#else
explain_stat_or_die(this->fn->str_text, &st);
#endif
return st.st_size;
}
static input_vtbl_ty vtbl =
{
sizeof(input_file_ty),
destruct,
iread,
get,
itell,
name,
length,
};
input_ty *
input_file_open(const char *fn)
{
input_ty *result;
input_file_ty *this;
if (!fn || !*fn)
return input_stdin();
result = input_new(&vtbl);
this = (input_file_ty *)result;
this->fp = explain_fopen_or_die(fn, "rb");
this->fn = str_from_c(fn);
this->unlink_on_close = 0;
this->pos = 0;
return result;
}
void
input_file_unlink_on_close(input_ty *fp)
{
input_file_ty *this;
if (fp->vptr != &vtbl)
return;
this = (input_file_ty *)fp;
this->unlink_on_close = 1;
}
/* vim: set ts=8 sw=4 et : */
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