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/*
* fhist - file history and comparison tools
* Copyright (C) 2000, 2002, 2008 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 <ac/unistd.h>
#include <error.h>
#include <fcheck.h>
#include <input/file.h>
#include <input/private.h>
#include <input/stdin.h>
#include <mem.h>
#include <str.h>
#include <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;
fclose_and_check(this->fp, this->fn->str_text);
if (this->unlink_on_close)
unlink(this->fn->str_text);
str_free(this->fn);
this->fp = 0;
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 = fread(data, (size_t)1, (size_t)len, this->fp);
if (result <= 0 && ferror(this->fp))
{
sub_context_ty *scp;
scp = sub_context_new();
sub_errno_set(scp);
sub_var_set_string(scp, "File_Name", this->fn);
fatal_intl(scp, i18n("read \"$filename\": $errno"));
/* NOTREACHED */
}
this->pos += result;
return result;
}
static int
get(input_ty *p)
{
input_file_ty *this;
int c;
this = (input_file_ty *)p;
c = getc(this->fp);
if (c == EOF && ferror(this->fp))
{
sub_context_ty *scp;
scp = sub_context_new();
sub_errno_set(scp);
sub_var_set_string(scp, "File_Name", this->fn);
fatal_intl(scp, i18n("read \"$filename\": $errno"));
/* NOTREACHED */
}
if (c != EOF)
this->pos++;
return c;
}
static long
itell(input_ty *p)
{
input_file_ty *this;
this = (input_file_ty *)p;
return this->pos;
}
static const char *
name(input_ty *p)
{
input_file_ty *this;
this = (input_file_ty *)p;
return this->fn->str_text;
}
static long
length(input_ty *p)
{
input_file_ty *this;
struct stat st;
int err;
this = (input_file_ty *)p;
#ifdef S_IFLNK
err = lstat(this->fn->str_text, &st);
#else
err = stat(this->fn->str_text, &st);
#endif
if (err < 0)
{
sub_context_ty *scp;
scp = sub_context_new();
sub_errno_set(scp);
sub_var_set_string(scp, "File_Name", this->fn);
fatal_intl(scp, i18n("stat \"$filename\": $errno"));
/* NOTREACHED */
}
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 = fopen_and_check(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;
}
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