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/* shell.c -- readline utility functions that are normally provided by
bash when readline is linked as part of the shell. */
/* Copyright (C) 1997-2009,2017 Free Software Foundation, Inc.
This file is part of the GNU Readline Library (Readline), a library
for reading lines of text with interactive input and history editing.
Readline is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Readline is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Readline. If not, see <http://www.gnu.org/licenses/>.
*/
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <sys/types.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#if defined (HAVE_STRING_H)
# include <string.h>
#else
# include <strings.h>
#endif /* !HAVE_STRING_H */
#if defined (HAVE_LIMITS_H)
# include <limits.h>
#endif
#if defined (HAVE_FCNTL_H)
#include <fcntl.h>
#endif
#if defined (HAVE_PWD_H)
#include <pwd.h>
#endif
#include <stdio.h>
#include "rlstdc.h"
#include "rlshell.h"
#include "rldefs.h"
#include "xmalloc.h"
#if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS)
extern struct passwd *getpwuid PARAMS((uid_t));
#endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */
#ifndef NULL
# define NULL 0
#endif
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
/* Nonzero if the integer type T is signed. */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* Bound on length of the string representing an integer value of type T.
Subtract one for the sign bit if T is signed;
302 / 1000 is log10 (2) rounded up;
add one for integer division truncation;
add one more for a minus sign if t is signed. */
#define INT_STRLEN_BOUND(t) \
((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
+ 1 + TYPE_SIGNED (t))
/* All of these functions are resolved from bash if we are linking readline
as part of bash. */
/* Does shell-like quoting using single quotes. */
char *
sh_single_quote (char *string)
{
register int c;
char *result, *r, *s;
result = (char *)xmalloc (3 + (4 * strlen (string)));
r = result;
*r++ = '\'';
for (s = string; s && (c = *s); s++)
{
*r++ = c;
if (c == '\'')
{
*r++ = '\\'; /* insert escaped single quote */
*r++ = '\'';
*r++ = '\''; /* start new quoted string */
}
}
*r++ = '\'';
*r = '\0';
return (result);
}
/* Set the environment variables LINES and COLUMNS to lines and cols,
respectively. */
static char setenv_buf[INT_STRLEN_BOUND (int) + 1];
static char putenv_buf1[INT_STRLEN_BOUND (int) + 6 + 1]; /* sizeof("LINES=") == 6 */
static char putenv_buf2[INT_STRLEN_BOUND (int) + 8 + 1]; /* sizeof("COLUMNS=") == 8 */
void
sh_set_lines_and_columns (int lines, int cols)
{
#if defined (HAVE_SETENV)
sprintf (setenv_buf, "%d", lines);
setenv ("LINES", setenv_buf, 1);
sprintf (setenv_buf, "%d", cols);
setenv ("COLUMNS", setenv_buf, 1);
#else /* !HAVE_SETENV */
# if defined (HAVE_PUTENV)
sprintf (putenv_buf1, "LINES=%d", lines);
putenv (putenv_buf1);
sprintf (putenv_buf2, "COLUMNS=%d", cols);
putenv (putenv_buf2);
# endif /* HAVE_PUTENV */
#endif /* !HAVE_SETENV */
}
char *
sh_get_env_value (const char *varname)
{
return ((char *)getenv (varname));
}
char *
sh_get_home_dir (void)
{
static char *home_dir = (char *)NULL;
struct passwd *entry;
if (home_dir)
return (home_dir);
home_dir = (char *)NULL;
#if defined (HAVE_GETPWUID)
# if defined (__TANDEM)
entry = getpwnam (getlogin ());
# else
entry = getpwuid (getuid ());
# endif
if (entry)
home_dir = savestring (entry->pw_dir);
#endif
#if defined (HAVE_GETPWENT)
endpwent (); /* some systems need this */
#endif
return (home_dir);
}
#if !defined (O_NDELAY)
# if defined (FNDELAY)
# define O_NDELAY FNDELAY
# endif
#endif
int
sh_unset_nodelay_mode (int fd)
{
#if defined (HAVE_FCNTL)
int flags, bflags;
if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
return -1;
bflags = 0;
#ifdef O_NONBLOCK
bflags |= O_NONBLOCK;
#endif
#ifdef O_NDELAY
bflags |= O_NDELAY;
#endif
if (flags & bflags)
{
flags &= ~bflags;
return (fcntl (fd, F_SETFL, flags));
}
#endif
return 0;
}
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