research.m1stereo.tv/gitweb/ - melted/blob - src/inigo/io.c

   1 /*
   2  * io.c -- dv1394d client demo input/output
   3  * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 /* System header files */
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <termios.h>
  31 #include <unistd.h>
  32 #include <sys/time.h>
  33
  34 /* Application header files */
  35 #include "io.h"
  36
  37 char *chomp( char *input )
  38 {
  39         if ( input != NULL )
  40         {
  41                 int length = strlen( input );
  42                 if ( length && input[ length - 1 ] == '\n' )
  43                         input[ length - 1 ] = '\0';
  44                 if ( length > 1 && input[ length - 2 ] == '\r' )
  45                         input[ length - 2 ] = '\0';
  46         }
  47         return input;
  48 }
  49
  50 char *trim( char *input )
  51 {
  52         if ( input != NULL )
  53         {
  54                 int length = strlen( input );
  55                 int first = 0;
  56                 while( first < length && isspace( input[ first ] ) )
  57                         first ++;
  58                 memmove( input, input + first, length - first + 1 );
  59                 length = length - first;
  60                 while ( length > 0 && isspace( input[ length - 1 ] ) )
  61                         input[ -- length ] = '\0';
  62         }
  63         return input;
  64 }
  65
  66 char *strip_quotes( char *input )
  67 {
  68         if ( input != NULL )
  69         {
  70                 char *ptr = strrchr( input, '\"' );
  71                 if ( ptr != NULL )
  72                         *ptr = '\0';
  73                 if ( input[ 0 ] == '\"' )
  74                         strcpy( input, input + 1 );
  75         }
  76         return input;
  77 }
  78
  79 char *get_string( char *output, int maxlength, char *use )
  80 {
  81         char *value = NULL;
  82         strcpy( output, use );
  83         if ( trim( chomp( fgets( output, maxlength, stdin ) ) ) != NULL )
  84         {
  85                 if ( !strcmp( output, "" ) )
  86                         strcpy( output, use );
  87                 value = output;
  88         }
  89         return value;
  90 }
  91
  92 int *get_int( int *output, int use )
  93 {
  94         int *value = NULL;
  95         char temp[ 132 ];
  96         *output = use;
  97         if ( trim( chomp( fgets( temp, 132, stdin ) ) ) != NULL )
  98         {
  99                 if ( strcmp( temp, "" ) )
 100                         *output = atoi( temp );
 101                 value = output;
 102         }
 103         return value;
 104 }
 105
 106 /** This stores the previous settings
 107 */
 108
 109 static struct termios oldtty;
 110 static int mode = 0;
 111
 112 /** This is called automatically on application exit to restore the
 113         previous tty settings.
 114 */
 115
 116 void term_exit(void)
 117 {
 118         if ( mode == 1 )
 119         {
 120                 tcsetattr( 0, TCSANOW, &oldtty );
 121                 mode = 0;
 122         }
 123 }
 124
 125 /** Init terminal so that we can grab keys without blocking.
 126 */
 127
 128 void term_init( )
 129 {
 130         struct termios tty;
 131
 132         tcgetattr( 0, &tty );
 133         oldtty = tty;
 134
 135         tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
 136         tty.c_oflag |= OPOST;
 137         tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
 138         tty.c_cflag &= ~(CSIZE|PARENB);
 139         tty.c_cflag |= CS8;
 140         tty.c_cc[ VMIN ] = 1;
 141         tty.c_cc[ VTIME ] = 0;
 142
 143         tcsetattr( 0, TCSANOW, &tty );
 144
 145         mode = 1;
 146
 147         atexit( term_exit );
 148 }
 149
 150 /** Check for a keypress without blocking infinitely.
 151         Returns: ASCII value of keypress or -1 if no keypress detected.
 152 */
 153
 154 int term_read( )
 155 {
 156     int n = 1;
 157     unsigned char ch;
 158     struct timeval tv;
 159     fd_set rfds;
 160
 161     FD_ZERO( &rfds );
 162     FD_SET( 0, &rfds );
 163     tv.tv_sec = 0;
 164     tv.tv_usec = 40000;
 165     n = select( 1, &rfds, NULL, NULL, &tv );
 166     if (n > 0)
 167         {
 168         n = read( 0, &ch, 1 );
 169                 tcflush( 0, TCIFLUSH );
 170         if (n == 1)
 171             return ch;
 172         return n;
 173     }
 174     return -1;
 175 }
 176
 177 char get_keypress( )
 178 {
 179         char value = '\0';
 180         int pressed = 0;
 181
 182         fflush( stdout );
 183
 184         term_init( );
 185         while ( ( pressed = term_read( ) ) == -1 ) ;
 186         term_exit( );
 187
 188         value = (char)pressed;
 189
 190         return value;
 191 }
 192
 193 void wait_for_any_key( char *message )
 194 {
 195         if ( message == NULL )
 196                 printf( "Press any key to continue: " );
 197         else
 198                 printf( "%s", message );
 199
 200         get_keypress( );
 201
 202         printf( "\n\n" );
 203 }
 204
 205 void beep( )
 206 {
 207         printf( "%c", 7 );
 208         fflush( stdout );
 209 }