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 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #define READLINE_LIBRARY
24
25 #if defined (HAVE_CONFIG_H)
26 # include "config_readline.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)
65 extern 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. */
92 char *
sh_single_quote(string)93 sh_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. */
123 void
sh_set_lines_and_columns(lines,cols)124 sh_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
152 char *
sh_get_env_value(varname)153 sh_get_env_value (varname)
154 const char *varname;
155 {
156 return ((char *)getenv (varname));
157 }
158
159 char *
sh_get_home_dir()160 sh_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
180 int
sh_unset_nodelay_mode(fd)181 sh_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