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/* openfile.c
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG 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 2 of the License, or
* (at your option) any later version.
*
* GNUPG 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include "util.h"
#include "memory.h"
#include "ttyio.h"
#include "options.h"
#include "main.h"
/****************
* Check wether FNAME exists and ask if it's okay to overwrite an
* existing one.
* Returns: -1 : Do not overwrite
* 0 : it's okay to overwrite or the file does not exist
* >0 : other error
*/
int
overwrite_filep( const char *fname )
{
if( !fname || (*fname == '-' && !fname[1]) )
return 0; /* stdout */
if( !access( fname, F_OK ) ) {
char *p;
int okay;
int first = 1;
if( opt.answer_yes )
okay = 1;
else if( opt.answer_no || opt.batch )
okay = 2;
else
okay = 0;
while( !okay ) {
if( first ) {
tty_printf("File '%s' exists. ", fname);
first = 0;
}
p = tty_get("Overwrite (y/N)? ");
tty_kill_prompt();
if( (*p == 'y' || *p == 'Y') && !p[1] )
okay = 1;
else if( !*p || ((*p == 'n' || *p == 'N') && !p[1]) )
okay = 2;
else
okay = 0;
m_free(p);
}
if( okay == 2 )
return -1;
/* fixme: add some backup stuff */
}
return 0;
}
/****************
* Make an output filename for the inputfile INAME.
* Returns an IOBUF
* Mode 0 = use ".gpg"
* 1 = use ".asc"
* 2 = use ".sig"
*/
IOBUF
open_outfile( const char *iname, int mode )
{
IOBUF a = NULL;
int rc;
if( (!iname || (*iname=='-' && !iname[1])) && !opt.outfile ) {
if( !(a = iobuf_create(NULL)) )
log_error("can't open [stdout]: %s\n", strerror(errno) );
else if( opt.verbose )
log_info("writing to stdout\n");
}
else {
char *buf=NULL;
const char *name;
if( opt.outfile )
name = opt.outfile;
else {
buf = m_alloc(strlen(iname)+4+1);
strcpy(stpcpy(buf,iname), mode==1 ? ".asc" :
mode==2 ? ".sig" : ".gpg");
name = buf;
}
if( !(rc=overwrite_filep( name )) ) {
if( !(a = iobuf_create( name )) )
log_error("can't create %s: %s\n", name, strerror(errno) );
else if( opt.verbose )
log_info("writing to '%s'\n", name );
}
else if( rc != -1 )
log_error("oops: overwrite_filep(%s): %s\n", name, g10_errstr(rc) );
m_free(buf);
}
return a;
}
/****************
* Try to open a file without the extension ".sig" or ".asc"
* Return NULL if such a file is not available.
*/
IOBUF
open_sigfile( const char *iname )
{
IOBUF a = NULL;
size_t len;
if( iname && !(*iname == '-' && !iname[1]) ) {
len = strlen(iname);
if( len > 4 && ( !strcmp(iname + len - 4, ".sig")
|| !strcmp(iname + len - 4, ".asc")) ) {
char *buf;
buf = m_strdup(iname);
buf[len-4] = 0 ;
a = iobuf_open( buf );
m_free(buf);
}
}
return a;
}
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