readline/examples/rlevent.c

   1 /*
   2  * rl - command-line interface to read a line from the standard input
   3  *      (or another fd) using readline.
   4  *
   5  * usage: rl [-p prompt] [-u unit] [-d default] [-n nchars]
   6  */
   7
   8 /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
   9
  10    This file is part of the GNU Readline Library (Readline), a library for
  11    reading lines of text with interactive input and history editing.
  12
  13    Readline is free software: you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation, either version 3 of the License, or
  16    (at your option) any later version.
  17
  18    Readline is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  25 */
  26
  27 #if defined (HAVE_CONFIG_H)
  28 #  include <config.h>
  29 #endif
  30
  31 #include <stdio.h>
  32 #include <sys/types.h>
  33
  34 #ifdef HAVE_STDLIB_H
  35 #  include <stdlib.h>
  36 #else
  37 extern void exit();
  38 #endif
  39
  40 #if defined (READLINE_LIBRARY)
  41 #  include "posixstat.h"
  42 #  include "readline.h"
  43 #  include "history.h"
  44 #else
  45 #  include <sys/stat.h>
  46 #  include <readline/readline.h>
  47 #  include <readline/history.h>
  48 #endif
  49
  50 extern int optind;
  51 extern char *optarg;
  52
  53 #if !defined (strchr) && !defined (__STDC__)
  54 extern char *strrchr();
  55 #endif
  56
  57 static char *progname;
  58 static char *deftext;
  59
  60 static int
  61 event_hook ()
  62 {
  63   fprintf (stderr, "ding!\n");
  64   sleep (1);
  65   return 0;
  66 }
  67
  68 static int
  69 set_deftext ()
  70 {
  71   if (deftext)
  72     {
  73       rl_insert_text (deftext);
  74       deftext = (char *)NULL;
  75       rl_startup_hook = (rl_hook_func_t *)NULL;
  76     }
  77   return 0;
  78 }
  79
  80 static void
  81 usage()
  82 {
  83   fprintf (stderr, "%s: usage: %s [-p prompt] [-u unit] [-d default] [-n nchars]\n",
  84                 progname, progname);
  85 }
  86
  87 int
  88 main (argc, argv)
  89      int argc;
  90      char **argv;
  91 {
  92   char *temp, *prompt;
  93   struct stat sb;
  94   int opt, fd, nch;
  95   FILE *ifp;
  96
  97   progname = strrchr(argv[0], '/');
  98   if (progname == 0)
  99     progname = argv[0];
 100   else
 101     progname++;
 102
 103   /* defaults */
 104   prompt = "readline$ ";
 105   fd = nch = 0;
 106   deftext = (char *)0;
 107
 108   while ((opt = getopt(argc, argv, "p:u:d:n:")) != EOF)
 109     {
 110       switch (opt)
 111         {
 112         case 'p':
 113           prompt = optarg;
 114           break;
 115         case 'u':
 116           fd = atoi(optarg);
 117           if (fd < 0)
 118             {
 119               fprintf (stderr, "%s: bad file descriptor `%s'\n", progname, optarg);
 120               exit (2);
 121             }
 122           break;
 123         case 'd':
 124           deftext = optarg;
 125           break;
 126         case 'n':
 127           nch = atoi(optarg);
 128           if (nch < 0)
 129             {
 130               fprintf (stderr, "%s: bad value for -n: `%s'\n", progname, optarg);
 131               exit (2);
 132             }
 133           break;
 134         default:
 135           usage ();
 136           exit (2);
 137         }
 138     }
 139
 140   if (fd != 0)
 141     {
 142       if (fstat (fd, &sb) < 0)
 143         {
 144           fprintf (stderr, "%s: %d: bad file descriptor\n", progname, fd);
 145           exit (1);
 146         }
 147       ifp = fdopen (fd, "r");
 148       rl_instream = ifp;
 149     }
 150
 151   if (deftext && *deftext)
 152     rl_startup_hook = set_deftext;
 153
 154   if (nch > 0)
 155     rl_num_chars_to_read = nch;
 156
 157   rl_event_hook = event_hook;
 158   temp = readline (prompt);
 159
 160   /* Test for EOF. */
 161   if (temp == 0)
 162     exit (1);
 163
 164   printf ("%s\n", temp);
 165   exit (0);
 166 }