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 Free Software Foundation, Inc.
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
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.
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.
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
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)
60 #if !defined (HAVE_GETPW_DECLS)
61 extern struct passwd *getpwuid PARAMS((uid_t));
62 #endif /* !HAVE_GETPW_DECLS */
72 /* Nonzero if the integer type T is signed. */
73 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
75 /* Bound on length of the string representing an integer value of type T.
76 Subtract one for the sign bit if T is signed;
77 302 / 1000 is log10 (2) rounded up;
78 add one for integer division truncation;
79 add one more for a minus sign if t is signed. */
80 #define INT_STRLEN_BOUND(t) \
81 ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
82 + 1 + TYPE_SIGNED (t))
84 /* All of these functions are resolved from bash if we are linking readline
87 /* Does shell-like quoting using single quotes. */
89 sh_single_quote (string)
95 result = (char *)xmalloc (3 + (4 * strlen (string)));
99 for (s = string; s && (c = *s); s++)
105 *r++ = '\\'; /* insert escaped single quote */
107 *r++ = '\''; /* start new quoted string */
117 /* Set the environment variables LINES and COLUMNS to lines and cols,
120 sh_set_lines_and_columns (lines, cols)
125 #if defined (HAVE_PUTENV)
126 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("LINES=") + 1);
127 sprintf (b, "LINES=%d", lines);
129 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1);
130 sprintf (b, "COLUMNS=%d", cols);
132 #else /* !HAVE_PUTENV */
133 # if defined (HAVE_SETENV)
134 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
135 sprintf (b, "%d", lines);
136 setenv ("LINES", b, 1);
137 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1);
138 sprintf (b, "%d", cols);
139 setenv ("COLUMNS", b, 1);
140 # endif /* HAVE_SETENV */
141 #endif /* !HAVE_PUTENV */
145 sh_get_env_value (varname)
148 return ((char *)getenv (varname));
155 struct passwd *entry;
157 home_dir = (char *)NULL;
158 entry = getpwuid (getuid ());
160 home_dir = entry->pw_dir;
164 #if !defined (O_NDELAY)
165 # if defined (FNDELAY)
166 # define O_NDELAY FNDELAY
171 sh_unset_nodelay_mode (fd)
176 if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
182 bflags |= O_NONBLOCK;
192 return (fcntl (fd, F_SETFL, flags));