shell.c revision 75409 
1/* $FreeBSD: head/contrib/libreadline/shell.c 75409 2001-04-11 03:15:56Z 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 "rlstdc.h"
54#include "rlshell.h"
55#include "xmalloc.h"
56
57#if !defined (HAVE_GETPW_DECLS)
58extern struct passwd *getpwuid __P((uid_t));
59#endif /* !HAVE_GETPW_DECLS */
60
61#ifndef NULL
62#  define NULL 0
63#endif
64
65/* All of these functions are resolved from bash if we are linking readline
66   as part of bash. */
67
68/* Does shell-like quoting using single quotes. */
69char *
70sh_single_quote (string)
71     char *string;
72{
73  register int c;
74  char *result, *r, *s;
75
76  result = (char *)xmalloc (3 + (4 * strlen (string)));
77  r = result;
78  *r++ = '\'';
79
80  for (s = string; s && (c = *s); s++)
81    {
82      *r++ = c;
83
84      if (c == '\'')
85	{
86	  *r++ = '\\';	/* insert escaped single quote */
87	  *r++ = '\'';
88	  *r++ = '\'';	/* start new quoted string */
89	}
90    }
91
92  *r++ = '\'';
93  *r = '\0';
94
95  return (result);
96}
97
98/* Set the environment variables LINES and COLUMNS to lines and cols,
99   respectively. */
100void
101sh_set_lines_and_columns (lines, cols)
102     int lines, cols;
103{
104  char *b;
105
106#if defined (HAVE_PUTENV)
107  b = xmalloc (24);
108  sprintf (b, "LINES=%d", lines);
109  putenv (b);
110  b = xmalloc (24);
111  sprintf (b, "COLUMNS=%d", cols);
112  putenv (b);
113#else /* !HAVE_PUTENV */
114#  if defined (HAVE_SETENV)
115  b = xmalloc (8);
116  sprintf (b, "%d", lines);
117  setenv ("LINES", b, 1);
118  b = xmalloc (8);
119  sprintf (b, "%d", cols);
120  setenv ("COLUMNS", b, 1);
121#  endif /* HAVE_SETENV */
122#endif /* !HAVE_PUTENV */
123}
124
125char *
126sh_get_env_value (varname)
127     const char *varname;
128{
129  return ((char *)getenv (varname));
130}
131
132char *
133sh_get_home_dir ()
134{
135  char *home_dir;
136  struct passwd *entry;
137
138  home_dir = (char *)NULL;
139  entry = getpwuid (getuid ());
140  if (entry)
141    home_dir = entry->pw_dir;
142  return (home_dir);
143}
144
145#if !defined (O_NDELAY)
146#  if defined (FNDELAY)
147#    define O_NDELAY FNDELAY
148#  endif
149#endif
150
151int
152sh_unset_nodelay_mode (fd)
153     int fd;
154{
155  int flags, bflags;
156
157  if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
158    return -1;
159
160  bflags = 0;
161
162#ifdef O_NONBLOCK
163  bflags |= O_NONBLOCK;
164#endif
165
166#ifdef O_NDELAY
167  bflags |= O_NDELAY;
168#endif
169
170  if (flags & bflags)
171    {
172      flags &= ~bflags;
173      return (fcntl (fd, F_SETFL, flags));
174    }
175
176  return 0;
177}
178