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166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
/* ttyio.c - tty i/O functions
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 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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* G10 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 <stdarg.h>
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#include <termios.h>
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#include <errno.h>
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#include <ctype.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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static int last_prompt_len;
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static FILE *
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open_tty(struct termios *termsave )
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{
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struct termios term;
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FILE *tty = fopen("/dev/tty", "r");
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if( !tty )
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log_fatal("cannot open /dev/tty: %s\n", strerror(errno) );
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if( termsave ) { /* hide input */
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if( tcgetattr(fileno(tty), termsave) )
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log_fatal("tcgetattr() failed: %s\n", strerror(errno) );
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term = *termsave;
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term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
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if( tcsetattr( fileno(tty), TCSAFLUSH, &term ) )
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log_fatal("tcsetattr() failed: %s\n", strerror(errno) );
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}
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return tty;
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}
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static void
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close_tty( FILE *tty, struct termios *termsave )
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{
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if( termsave ) {
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if( tcsetattr(fileno(tty), TCSAFLUSH, termsave) )
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log_error("tcsetattr() failed: %s\n", strerror(errno) );
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putc('\n', stderr);
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}
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fclose(tty);
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}
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void
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tty_printf( const char *fmt, ... )
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{
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va_list arg_ptr;
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va_start( arg_ptr, fmt ) ;
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last_prompt_len += vfprintf(stderr,fmt,arg_ptr) ;
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va_end(arg_ptr);
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fflush(stderr);
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}
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/****************
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* Print a string, but filter all control characters out.
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*/
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void
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tty_print_string( byte *p, size_t n )
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{
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for( ; n; n--, p++ )
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if( iscntrl( *p ) ) {
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putc('\\', stderr);
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if( *p == '\n' )
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putc('n', stderr);
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else if( !*p )
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putc('0', stderr);
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else
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fprintf(stderr, "x%02x", *p );
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}
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else
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putc(*p, stderr);
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}
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static char *
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do_get( const char *prompt, int hidden )
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{
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char *buf;
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int c, n, i;
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FILE *fp;
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struct termios termsave;
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last_prompt_len = 0;
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tty_printf( prompt );
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buf = m_alloc(n=50);
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i = 0;
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fp = open_tty(hidden? &termsave: NULL);
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while( (c=getc(fp)) != EOF && c != '\n' ) {
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last_prompt_len++;
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if( c == '\t' )
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c = ' ';
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else if( iscntrl(c) )
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continue;
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if( !(i < n-1) ) {
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n += 50;
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buf = m_realloc( buf, n );
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}
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buf[i++] = c;
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}
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close_tty(fp, hidden? &termsave: NULL);
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buf[i] = 0;
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return buf;
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}
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char *
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tty_get( const char *prompt )
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{
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return do_get( prompt, 0 );
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}
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char *
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tty_get_hidden( const char *prompt )
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{
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return do_get( prompt, 1 );
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}
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void
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tty_kill_prompt()
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{
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int i;
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#if 0
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for(i=0; i < last_prompt_len; i ++ )
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fputc('\b', stderr);
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for(i=0; i < last_prompt_len; i ++ )
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fputc(' ', stderr);
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for(i=0; i < last_prompt_len; i ++ )
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fputc('\b', stderr);
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#endif
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last_prompt_len = 0;
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fflush(stderr);
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}
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