shell.c revision 58314 
1/* $FreeBSD: head/contrib/libreadline/shell.c 58314 2000-03-19 22:00:57Z ache $ */
2/* shell.c -- readline utility functions that are normally provided by
3	      bash when readline is linked as part of the shell. */
4
5/* Copyright (C) 1997 Free Software Foundation, Inc.
6
7   This file is part of the GNU Readline Library, a library for
8   reading lines of text with interactive input and history editing.
9
10   The GNU Readline Library is free software; you can redistribute it
11   and/or modify it under the terms of the GNU General Public License
12   as published by the Free Software Foundation; either version 2, or
13   (at your option) any later version.
14
15   The GNU Readline Library is distributed in the hope that it will be
16   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
17   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18   GNU General Public License for more details.
19
20   The GNU General Public License is often shipped with GNU software, and
21   is generally kept in a file called COPYING or LICENSE.  If you do not
22   have a copy of the license, write to the Free Software Foundation,
23   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
24#define READLINE_LIBRARY
25
26#if defined (HAVE_CONFIG_H)
27#  include <config.h>
28#endif
29
30#include <sys/types.h>
31
32#if defined (HAVE_UNISTD_H)
33#  include <unistd.h>
34#endif /* HAVE_UNISTD_H */
35
36#if defined (HAVE_STDLIB_H)
37#  include <stdlib.h>
38#else
39#  include "ansi_stdlib.h"
40#endif /* HAVE_STDLIB_H */
41
42#if defined (HAVE_STRING_H)
43#  include <string.h>
44#else
45#  include <strings.h>
46#endif /* !HAVE_STRING_H */
47
48#include <fcntl.h>
49#include <pwd.h>
50
51#include <stdio.h>
52
53#include "rlshell.h"
54#include "xmalloc.h"
55
56#if !defined (HAVE_GETPW_DECLS)
57extern struct passwd *getpwuid ();
58#endif /* !HAVE_GETPW_DECLS */
59
60#ifndef NULL
61#  define NULL 0
62#endif
63
64/* All of these functions are resolved from bash if we are linking readline
65   as part of bash. */
66
67/* Does shell-like quoting using single quotes. */
68char *
69single_quote (string)
70     char *string;
71{
72  register int c;
73  char *result, *r, *s;
74
75  result = (char *)xmalloc (3 + (4 * strlen (string)));
76  r = result;
77  *r++ = '\'';
78
79  for (s = string; s && (c = *s); s++)
80    {
81      *r++ = c;
82
83      if (c == '\'')
84	{
85	  *r++ = '\\';	/* insert escaped single quote */
86	  *r++ = '\'';
87	  *r++ = '\'';	/* start new quoted string */
88	}
89    }
90
91  *r++ = '\'';
92  *r = '\0';
93
94  return (result);
95}
96
97/* Set the environment variables LINES and COLUMNS to lines and cols,
98   respectively. */
99void
100set_lines_and_columns (lines, cols)
101     int lines, cols;
102{
103  char *b;
104
105#if defined (HAVE_PUTENV)
106  b = xmalloc (24);
107  sprintf (b, "LINES=%d", lines);
108  putenv (b);
109  b = xmalloc (24);
110  sprintf (b, "COLUMNS=%d", cols);
111  putenv (b);
112#else /* !HAVE_PUTENV */
113#  if defined (HAVE_SETENV)
114  b = xmalloc (8);
115  sprintf (b, "%d", lines);
116  setenv ("LINES", b, 1);
117  b = xmalloc (8);
118  sprintf (b, "%d", cols);
119  setenv ("COLUMNS", b, 1);
120#  endif /* HAVE_SETENV */
121#endif /* !HAVE_PUTENV */
122}
123
124char *
125get_env_value (varname)
126     char *varname;
127{
128  return ((char *)getenv (varname));
129}
130
131char *
132get_home_dir ()
133{
134  char *home_dir;
135  struct passwd *entry;
136
137  home_dir = (char *)NULL;
138  entry = getpwuid (getuid ());
139  if (entry)
140    home_dir = entry->pw_dir;
141  return (home_dir);
142}
143
144#if !defined (O_NDELAY)
145#  if defined (FNDELAY)
146#    define O_NDELAY FNDELAY
147#  endif
148#endif
149
150int
151unset_nodelay_mode (fd)
152     int fd;
153{
154  int flags, bflags;
155
156  if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
157    return -1;
158
159  bflags = 0;
160
161#ifdef O_NONBLOCK
162  bflags |= O_NONBLOCK;
163#endif
164
165#ifdef O_NDELAY
166  bflags |= O_NDELAY;
167#endif
168
169  if (flags & bflags)
170    {
171      flags &= ~bflags;
172      return (fcntl (fd, F_SETFL, flags));
173    }
174
175  return 0;
176}
177