1/* $FreeBSD$ */
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#if defined (HAVE_LIMITS_H)
49#  include <limits.h>
50#endif
51
52#if defined (HAVE_FCNTL_H)
53#include <fcntl.h>
54#endif
55#if defined (HAVE_PWD_H)
56#include <pwd.h>
57#endif
58
59#include <stdio.h>
60
61#include "rlstdc.h"
62#include "rlshell.h"
63#include "xmalloc.h"
64
65#if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS)
66extern struct passwd *getpwuid PARAMS((uid_t));
67#endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */
68
69#ifndef NULL
70#  define NULL 0
71#endif
72
73#ifndef CHAR_BIT
74#  define CHAR_BIT 8
75#endif
76
77/* Nonzero if the integer type T is signed.  */
78#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
79
80/* Bound on length of the string representing an integer value of type T.
81   Subtract one for the sign bit if T is signed;
82   302 / 1000 is log10 (2) rounded up;
83   add one for integer division truncation;
84   add one more for a minus sign if t is signed.  */
85#define INT_STRLEN_BOUND(t) \
86  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
87   + 1 + TYPE_SIGNED (t))
88
89/* All of these functions are resolved from bash if we are linking readline
90   as part of bash. */
91
92/* Does shell-like quoting using single quotes. */
93char *
94sh_single_quote (string)
95     char *string;
96{
97  register int c;
98  char *result, *r, *s;
99
100  result = (char *)xmalloc (3 + (4 * strlen (string)));
101  r = result;
102  *r++ = '\'';
103
104  for (s = string; s && (c = *s); s++)
105    {
106      *r++ = c;
107
108      if (c == '\'')
109	{
110	  *r++ = '\\';	/* insert escaped single quote */
111	  *r++ = '\'';
112	  *r++ = '\'';	/* start new quoted string */
113	}
114    }
115
116  *r++ = '\'';
117  *r = '\0';
118
119  return (result);
120}
121
122/* Set the environment variables LINES and COLUMNS to lines and cols,
123   respectively. */
124void
125sh_set_lines_and_columns (lines, cols)
126     int lines, cols;
127{
128  char *b;
129
130#if defined (HAVE_SETENV)
131  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
132  sprintf (b, "%d", lines);
133  setenv ("LINES", b, 1);
134  free (b);
135
136  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
137  sprintf (b, "%d", cols);
138  setenv ("COLUMNS", b, 1);
139  free (b);
140#else /* !HAVE_SETENV */
141#  if defined (HAVE_PUTENV)
142  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("LINES=") + 1);
143  sprintf (b, "LINES=%d", lines);
144  putenv (b);
145
146  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1);
147  sprintf (b, "COLUMNS=%d", cols);
148  putenv (b);
149#  endif /* HAVE_PUTENV */
150#endif /* !HAVE_SETENV */
151}
152
153char *
154sh_get_env_value (varname)
155     const char *varname;
156{
157  return ((char *)getenv (varname));
158}
159
160char *
161sh_get_home_dir ()
162{
163  char *home_dir;
164  struct passwd *entry;
165
166  home_dir = (char *)NULL;
167#if defined (HAVE_GETPWUID)
168  entry = getpwuid (getuid ());
169  if (entry)
170    home_dir = entry->pw_dir;
171#endif
172  return (home_dir);
173}
174
175#if !defined (O_NDELAY)
176#  if defined (FNDELAY)
177#    define O_NDELAY FNDELAY
178#  endif
179#endif
180
181int
182sh_unset_nodelay_mode (fd)
183     int fd;
184{
185#if defined (HAVE_FCNTL)
186  int flags, bflags;
187
188  if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
189    return -1;
190
191  bflags = 0;
192
193#ifdef O_NONBLOCK
194  bflags |= O_NONBLOCK;
195#endif
196
197#ifdef O_NDELAY
198  bflags |= O_NDELAY;
199#endif
200
201  if (flags & bflags)
202    {
203      flags &= ~bflags;
204      return (fcntl (fd, F_SETFL, flags));
205    }
206#endif
207
208  return 0;
209}
210