1 files changed, 119 insertions, 0 deletions
diff --git a/g10/openfile.c b/g10/openfile.c
new file mode 100644
index 000000000..1a840f19c
--- /dev/null
+++ b/g10/openfile.c
@@ -0,0 +1,119 @@
+/* openfile.c
+ *	Copyright (c) 1997 by Werner Koch (dd9jn)
+ *
+ * This file is part of G10.
+ *
+ * G10 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.
+ *
+ * G10 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 <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( !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( !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
+ */
+IOBUF
+open_outfile( const char *iname )
+{
+    IOBUF a = NULL;
+    int rc;
+
+    if( (!iname && !opt.outfile) || opt.outfile_is_stdout ) {
+	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), ".g10");
+	    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;
+}
+