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)
66 extern 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. */
93 char *
sh_single_quote(string)94 sh_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. */
124 void
sh_set_lines_and_columns(lines,cols)125 sh_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
153 char *
sh_get_env_value(varname)154 sh_get_env_value (varname)
155 const char *varname;
156 {
157 return ((char *)getenv (varname));
158 }
159
160 char *
sh_get_home_dir()161 sh_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
181 int
sh_unset_nodelay_mode(fd)182 sh_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