1 /* shell.c -- readline utility functions that are normally provided by
2 bash when readline is linked as part of the shell. */
4 /* Copyright (C) 1997-2009 Free Software Foundation, Inc.
6 This file is part of the GNU Readline Library (Readline), a library
7 for reading lines of text with interactive input and history editing.
9 Readline is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 Readline is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with Readline. If not, see <http://www.gnu.org/licenses/>.
23 #define READLINE_LIBRARY
25 #if defined (HAVE_CONFIG_H)
29 #include <sys/types.h>
31 #if defined (HAVE_UNISTD_H)
33 #endif /* HAVE_UNISTD_H */
35 #if defined (HAVE_STDLIB_H)
38 # include "ansi_stdlib.h"
39 #endif /* HAVE_STDLIB_H */
41 #if defined (HAVE_STRING_H)
45 #endif /* !HAVE_STRING_H */
47 #if defined (HAVE_LIMITS_H)
51 #if defined (HAVE_FCNTL_H)
54 #if defined (HAVE_PWD_H)
64 #if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS)
65 extern struct passwd
*getpwuid
PARAMS((uid_t
));
66 #endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */
76 /* Nonzero if the integer type T is signed. */
77 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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))
88 /* All of these functions are resolved from bash if we are linking readline
91 /* Does shell-like quoting using single quotes. */
93 sh_single_quote (string
)
99 result
= (char *)xmalloc (3 + (4 * strlen (string
)));
103 for (s
= string
; s
&& (c
= *s
); s
++)
109 *r
++ = '\\'; /* insert escaped single quote */
111 *r
++ = '\''; /* start new quoted string */
121 /* Set the environment variables LINES and COLUMNS to lines and cols,
124 sh_set_lines_and_columns (lines
, cols
)
129 #if defined (HAVE_SETENV)
130 b
= (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
131 sprintf (b
, "%d", lines
);
132 setenv ("LINES", b
, 1);
135 b
= (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
136 sprintf (b
, "%d", cols
);
137 setenv ("COLUMNS", b
, 1);
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
);
145 b
= (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1);
146 sprintf (b
, "COLUMNS=%d", cols
);
148 # endif /* HAVE_PUTENV */
149 #endif /* !HAVE_SETENV */
153 sh_get_env_value (varname
)
156 return ((char *)getenv (varname
));
163 struct passwd
*entry
;
165 home_dir
= (char *)NULL
;
166 #if defined (HAVE_GETPWUID)
167 entry
= getpwuid (getuid ());
169 home_dir
= entry
->pw_dir
;
174 #if !defined (O_NDELAY)
175 # if defined (FNDELAY)
176 # define O_NDELAY FNDELAY
181 sh_unset_nodelay_mode (fd
)
184 #if defined (HAVE_FCNTL)
187 if ((flags
= fcntl (fd
, F_GETFL
, 0)) < 0)
193 bflags
|= O_NONBLOCK
;
203 return (fcntl (fd
, F_SETFL
, flags
));
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