1/* shell.c -- readline utility functions that are normally provided by
2	      bash when readline is linked as part of the shell. */
3
4/* Copyright (C) 1997 Free Software Foundation, Inc.
5
6   This file is part of the GNU Readline Library, a library for
7   reading lines of text with interactive input and history editing.
8
9   The GNU Readline Library is free software; you can redistribute it
10   and/or modify it under the terms of the GNU General Public License
11   as published by the Free Software Foundation; either version 2, or
12   (at your option) any later version.
13
14   The GNU Readline Library is distributed in the hope that it will be
15   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   The GNU General Public License is often shipped with GNU software, and
20   is generally kept in a file called COPYING or LICENSE.  If you do not
21   have a copy of the license, write to the Free Software Foundation,
22   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23#define READLINE_LIBRARY
24
25#if defined (HAVE_CONFIG_H)
26#  include <config.h>
27#endif
28
29#include <sys/types.h>
30
31#if defined (HAVE_UNISTD_H)
32#  include <unistd.h>
33#endif /* HAVE_UNISTD_H */
34
35#if defined (HAVE_STDLIB_H)
36#  include <stdlib.h>
37#else
38#  include "ansi_stdlib.h"
39#endif /* HAVE_STDLIB_H */
40
41#if defined (HAVE_STRING_H)
42#  include <string.h>
43#else
44#  include <strings.h>
45#endif /* !HAVE_STRING_H */
46
47#if defined (HAVE_LIMITS_H)
48#  include <limits.h>
49#endif
50
51#if defined (HAVE_FCNTL_H)
52#include <fcntl.h>
53#endif
54#if defined (HAVE_PWD_H)
55#include <pwd.h>
56#endif
57
58#include <stdio.h>
59
60#include "rlstdc.h"
61#include "rlshell.h"
62#include "xmalloc.h"
63
64#if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS)
65extern struct passwd *getpwuid PARAMS((uid_t));
66#endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */
67
68#ifndef NULL
69#  define NULL 0
70#endif
71
72#ifndef CHAR_BIT
73#  define CHAR_BIT 8
74#endif
75
76/* Nonzero if the integer type T is signed.  */
77#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
78
79/* Bound on length of the string representing an integer value of type T.
80   Subtract one for the sign bit if T is signed;
81   302 / 1000 is log10 (2) rounded up;
82   add one for integer division truncation;
83   add one more for a minus sign if t is signed.  */
84#define INT_STRLEN_BOUND(t) \
85  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
86   + 1 + TYPE_SIGNED (t))
87
88/* All of these functions are resolved from bash if we are linking readline
89   as part of bash. */
90
91/* Does shell-like quoting using single quotes. */
92char *
93sh_single_quote (string)
94     char *string;
95{
96  register int c;
97  char *result, *r, *s;
98
99  result = (char *)xmalloc (3 + (4 * strlen (string)));
100  r = result;
101  *r++ = '\'';
102
103  for (s = string; s && (c = *s); s++)
104    {
105      *r++ = c;
106
107      if (c == '\'')
108	{
109	  *r++ = '\\';	/* insert escaped single quote */
110	  *r++ = '\'';
111	  *r++ = '\'';	/* start new quoted string */
112	}
113    }
114
115  *r++ = '\'';
116  *r = '\0';
117
118  return (result);
119}
120
121/* Set the environment variables LINES and COLUMNS to lines and cols,
122   respectively. */
123void
124sh_set_lines_and_columns (lines, cols)
125     int lines, cols;
126{
127  char *b;
128
129#if defined (HAVE_SETENV)
130  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
131  sprintf (b, "%d", lines);
132  setenv ("LINES", b, 1);
133  free (b);
134
135  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
136  sprintf (b, "%d", cols);
137  setenv ("COLUMNS", b, 1);
138  free (b);
139#else /* !HAVE_SETENV */
140#  if defined (HAVE_PUTENV)
141  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("LINES=") + 1);
142  sprintf (b, "LINES=%d", lines);
143  putenv (b);
144
145  b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1);
146  sprintf (b, "COLUMNS=%d", cols);
147  putenv (b);
148#  endif /* HAVE_PUTENV */
149#endif /* !HAVE_SETENV */
150}
151
152char *
153sh_get_env_value (varname)
154     const char *varname;
155{
156  return ((char *)getenv (varname));
157}
158
159char *
160sh_get_home_dir ()
161{
162  char *home_dir;
163  struct passwd *entry;
164
165  home_dir = (char *)NULL;
166#if defined (HAVE_GETPWUID)
167  entry = getpwuid (getuid ());
168  if (entry)
169    home_dir = entry->pw_dir;
170#endif
171  return (home_dir);
172}
173
174#if !defined (O_NDELAY)
175#  if defined (FNDELAY)
176#    define O_NDELAY FNDELAY
177#  endif
178#endif
179
180int
181sh_unset_nodelay_mode (fd)
182     int fd;
183{
184#if defined (HAVE_FCNTL)
185  int flags, bflags;
186
187  if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
188    return -1;
189
190  bflags = 0;
191
192#ifdef O_NONBLOCK
193  bflags |= O_NONBLOCK;
194#endif
195
196#ifdef O_NDELAY
197  bflags |= O_NDELAY;
198#endif
199
200  if (flags & bflags)
201    {
202      flags &= ~bflags;
203      return (fcntl (fd, F_SETFL, flags));
204    }
205#endif
206
207  return 0;
208}
209