mirror of git://git.gnupg.org/gnupg.git
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/* openfile.c
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GNUPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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#include "memory.h"
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#include "ttyio.h"
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#include "options.h"
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#include "main.h"
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/****************
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* Check wether FNAME exists and ask if it's okay to overwrite an
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* existing one.
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* Returns: -1 : Do not overwrite
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* 0 : it's okay to overwrite or the file does not exist
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* >0 : other error
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*/
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int
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overwrite_filep( const char *fname )
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{
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if( !access( fname, F_OK ) ) {
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char *p;
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int okay;
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int first = 1;
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if( opt.answer_yes )
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okay = 1;
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else if( opt.answer_no || opt.batch )
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okay = 2;
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else
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okay = 0;
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while( !okay ) {
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if( !okay )
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if( first ) {
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tty_printf("File '%s' exists. ", fname);
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first = 0;
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}
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p = tty_get("Overwrite (y/N)? ");
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tty_kill_prompt();
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if( (*p == 'y' || *p == 'Y') && !p[1] )
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okay = 1;
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else if( !*p || ((*p == 'n' || *p == 'N') && !p[1]) )
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okay = 2;
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else
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okay = 0;
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m_free(p);
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}
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if( okay == 2 )
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return -1;
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/* fixme: add some backup stuff */
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}
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return 0;
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}
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/****************
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* Make an output filename for the inputfile INAME.
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* Returns an IOBUF
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* Mode 0 = use ".gpg"
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* 1 = use ".asc"
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* 2 = use ".sig"
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*/
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IOBUF
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open_outfile( const char *iname, int mode )
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{
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IOBUF a = NULL;
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int rc;
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if( !iname && !opt.outfile ) {
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if( !(a = iobuf_create(NULL)) )
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log_error("can't open [stdout]: %s\n", strerror(errno) );
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else if( opt.verbose )
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log_info("writing to stdout\n");
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}
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else {
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char *buf=NULL;
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const char *name;
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if( opt.outfile )
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name = opt.outfile;
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else {
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buf = m_alloc(strlen(iname)+4+1);
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strcpy(stpcpy(buf,iname), mode==1 ? ".asc" :
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mode==2 ? ".sig" : ".gpg");
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name = buf;
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}
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if( !(rc=overwrite_filep( name )) ) {
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if( !(a = iobuf_create( name )) )
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log_error("can't create %s: %s\n", name, strerror(errno) );
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else if( opt.verbose )
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log_info("writing to '%s'\n", name );
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}
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else if( rc != -1 )
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log_error("oops: overwrite_filep(%s): %s\n", name, g10_errstr(rc) );
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m_free(buf);
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}
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return a;
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}
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/****************
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* Try to open a file without the extension ".sig" or ".asc"
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* Return NULL if such a file is not available.
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*/
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IOBUF
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open_sigfile( const char *iname )
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{
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IOBUF a = NULL;
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size_t len;
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if( iname ) {
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len = strlen(iname);
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if( len > 4 && ( !strcmp(iname + len - 4, ".sig")
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|| !strcmp(iname + len - 4, ".asc")) ) {
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char *buf;
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buf = m_strdup(iname);
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buf[len-4] = 0 ;
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a = iobuf_open( buf );
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m_free(buf);
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}
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}
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return a;
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}
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