aboutsummaryrefslogtreecommitdiff
path: root/readline/examples/rl.c
blob: d2604895e52fc0cb5467517ae9a27b95e08e362b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * rl - command-line interface to read a line from the standard input
 *      (or another fd) using readline.
 *
 * usage: rl [-p prompt] [-u unit] [-d default] [-n nchars]
 */

/* Copyright (C) 1987-2002 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline Library 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, or
   (at your option) any later version.

   The GNU Readline Library 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.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <stdio.h>
#include <sys/types.h>
#include "posixstat.h"

#if defined (READLINE_LIBRARY)
#  include "readline.h"
#  include "history.h"
#else
#  include <readline/readline.h>
#  include <readline/history.h>
#endif

extern int optind;
extern char *optarg;

#if !defined (strchr) && !defined (__STDC__)
extern char *strrchr();
#endif

static char *progname;
static char *deftext;

static int
set_deftext ()
{
  if (deftext)
    {
      rl_insert_text (deftext);
      deftext = (char *)NULL;
      rl_startup_hook = (rl_hook_func_t *)NULL;
    }
  return 0;
}

static void
usage()
{
  fprintf (stderr, "%s: usage: %s [-p prompt] [-u unit] [-d default] [-n nchars]\n",
		progname, progname);
}

int
main (argc, argv)
     int argc;
     char **argv;
{
  char *temp, *prompt;
  struct stat sb;
  int opt, fd, nch;
  FILE *ifp;

  progname = strrchr(argv[0], '/');
  if (progname == 0)
    progname = argv[0];
  else
    progname++;

  /* defaults */
  prompt = "readline$ ";
  fd = nch = 0;
  deftext = (char *)0;

  while ((opt = getopt(argc, argv, "p:u:d:n:")) != EOF)
    {
      switch (opt)
	{
	case 'p':
	  prompt = optarg;
	  break;
	case 'u':
	  fd = atoi(optarg);
	  if (fd < 0)
	    {
	      fprintf (stderr, "%s: bad file descriptor `%s'\n", progname, optarg);
	      exit (2);
	    }
	  break;
	case 'd':
	  deftext = optarg;
	  break;
	case 'n':
	  nch = atoi(optarg);
	  if (nch < 0)
	    {
	      fprintf (stderr, "%s: bad value for -n: `%s'\n", progname, optarg);
	      exit (2);
	    }
	  break;
	default:
	  usage ();
	  exit (2);
	}
    }

  if (fd != 0)
    {
      if (fstat (fd, &sb) < 0)
	{
	  fprintf (stderr, "%s: %d: bad file descriptor\n", progname, fd);
	  exit (1);
	}
      ifp = fdopen (fd, "r");
      rl_instream = ifp;
    }

  if (deftext && *deftext)
    rl_startup_hook = set_deftext;

  if (nch > 0)
    rl_num_chars_to_read = nch;

  temp = readline (prompt);

  /* Test for EOF. */
  if (temp == 0)
    exit (1);

  printf ("%s\n", temp);
  exit (0);
}