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Imported from ../bash-2.05.tar.gz.
[thirdparty/bash.git] / lib / readline / shell.c
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 #include <fcntl.h>
48 #include <pwd.h>
49
50 #include <stdio.h>
51
52 #include "rlstdc.h"
53 #include "rlshell.h"
54 #include "xmalloc.h"
55
56 #if !defined (HAVE_GETPW_DECLS)
57 extern struct passwd *getpwuid __P((uid_t));
58 #endif /* !HAVE_GETPW_DECLS */
59
60 #ifndef NULL
61 # define NULL 0
62 #endif
63
64 /* All of these functions are resolved from bash if we are linking readline
65 as part of bash. */
66
67 /* Does shell-like quoting using single quotes. */
68 char *
69 sh_single_quote (string)
70 char *string;
71 {
72 register int c;
73 char *result, *r, *s;
74
75 result = (char *)xmalloc (3 + (4 * strlen (string)));
76 r = result;
77 *r++ = '\'';
78
79 for (s = string; s && (c = *s); s++)
80 {
81 *r++ = c;
82
83 if (c == '\'')
84 {
85 *r++ = '\\'; /* insert escaped single quote */
86 *r++ = '\'';
87 *r++ = '\''; /* start new quoted string */
88 }
89 }
90
91 *r++ = '\'';
92 *r = '\0';
93
94 return (result);
95 }
96
97 /* Set the environment variables LINES and COLUMNS to lines and cols,
98 respectively. */
99 void
100 sh_set_lines_and_columns (lines, cols)
101 int lines, cols;
102 {
103 char *b;
104
105 #if defined (HAVE_PUTENV)
106 b = xmalloc (24);
107 sprintf (b, "LINES=%d", lines);
108 putenv (b);
109 b = xmalloc (24);
110 sprintf (b, "COLUMNS=%d", cols);
111 putenv (b);
112 #else /* !HAVE_PUTENV */
113 # if defined (HAVE_SETENV)
114 b = xmalloc (8);
115 sprintf (b, "%d", lines);
116 setenv ("LINES", b, 1);
117 b = xmalloc (8);
118 sprintf (b, "%d", cols);
119 setenv ("COLUMNS", b, 1);
120 # endif /* HAVE_SETENV */
121 #endif /* !HAVE_PUTENV */
122 }
123
124 char *
125 sh_get_env_value (varname)
126 const char *varname;
127 {
128 return ((char *)getenv (varname));
129 }
130
131 char *
132 sh_get_home_dir ()
133 {
134 char *home_dir;
135 struct passwd *entry;
136
137 home_dir = (char *)NULL;
138 entry = getpwuid (getuid ());
139 if (entry)
140 home_dir = entry->pw_dir;
141 return (home_dir);
142 }
143
144 #if !defined (O_NDELAY)
145 # if defined (FNDELAY)
146 # define O_NDELAY FNDELAY
147 # endif
148 #endif
149
150 int
151 sh_unset_nodelay_mode (fd)
152 int fd;
153 {
154 int flags, bflags;
155
156 if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
157 return -1;
158
159 bflags = 0;
160
161 #ifdef O_NONBLOCK
162 bflags |= O_NONBLOCK;
163 #endif
164
165 #ifdef O_NDELAY
166 bflags |= O_NDELAY;
167 #endif
168
169 if (flags & bflags)
170 {
171 flags &= ~bflags;
172 return (fcntl (fd, F_SETFL, flags));
173 }
174
175 return 0;
176 }