mirror of
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141 lines
3.4 KiB
C
141 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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#include "status.h"
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#include "i18n.h"
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/****************
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* Check whether FNAME exists and ask if it's okay to overwrite an
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* existing one.
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* Returns: True: it's okay to overwrite or the file does not exist
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* False: Do not overwrite
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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( !fname || (*fname == '-' && !fname[1]) )
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return 1; /* writing to stdout is always okay */
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if( access( fname, F_OK ) )
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return 1; /* does not exist */
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/* fixme: add some backup stuff in case of overwrite */
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if( opt.answer_yes )
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return 1;
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if( opt.answer_no || opt.batch )
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return 0; /* do not overwrite */
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tty_printf(_("File '%s' exists. "), fname);
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if( cpr_get_answer_is_yes(N_("openfile.overwrite.okay"),
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_("Overwrite (y/N)? ")) )
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return 1;
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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 and an errorcode
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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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int
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open_outfile( const char *iname, int mode, IOBUF *a )
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{
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int rc = 0;
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*a = NULL;
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if( (!iname || (*iname=='-' && !iname[1])) && !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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rc = G10ERR_CREATE_FILE;
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}
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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( 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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rc = G10ERR_CREATE_FILE;
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}
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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
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rc = G10ERR_FILE_EXISTS;
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m_free(buf);
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}
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return rc;
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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 && !(*iname == '-' && !iname[1]) ) {
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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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if( opt.verbose )
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log_info("assuming signed data in '%s'\n", 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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