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#include <stdio.h> 31 32#if defined (HAVE_UNISTD_H) 33# include <unistd.h> 34#endif /* HAVE_UNISTD_H */ 35 36#if defined (HAVE_STDLIB_H) 37# include <stdlib.h> 38#else 39# include "ansi_stdlib.h" 40#endif /* HAVE_STDLIB_H */ 41 42#if defined (HAVE_STRING_H) 43# include <string.h> 44#else 45# include <strings.h> 46#endif /* !HAVE_STRING_H */ 47 48#if defined (HAVE_LIMITS_H) 49# include <limits.h> 50#endif 51 52#include <fcntl.h> 53#include <pwd.h> 54 55#include <stdio.h> 56 57#include "rlstdc.h" 58#include "rlshell.h" 59#include "xmalloc.h" 60 61#if !defined (HAVE_GETPW_DECLS) 62extern struct passwd *getpwuid PARAMS((uid_t)); 63#endif /* !HAVE_GETPW_DECLS */ 64 65#ifndef NULL 66# define NULL 0 67#endif 68 69#ifndef CHAR_BIT 70# define CHAR_BIT 8 71#endif 72 73/* Nonzero if the integer type T is signed. */ 74#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) 75 76/* Bound on length of the string representing an integer value of type T. 77 Subtract one for the sign bit if T is signed; 78 302 / 1000 is log10 (2) rounded up; 79 add one for integer division truncation; 80 add one more for a minus sign if t is signed. */ 81#define INT_STRLEN_BOUND(t) \ 82 ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \ 83 + 1 + TYPE_SIGNED (t)) 84 85/* All of these functions are resolved from bash if we are linking readline 86 as part of bash. */ 87 88/* Does shell-like quoting using single quotes. */ 89char * 90sh_single_quote (string) 91 char *string; 92{ 93 register int c; 94 char *result, *r, *s; 95 96 result = (char *)xmalloc (3 + (4 * strlen (string))); 97 r = result; 98 *r++ = '\''; 99 100 for (s = string; s && (c = *s); s++) 101 { 102 *r++ = c; 103 104 if (c == '\'') 105 { 106 *r++ = '\\'; /* insert escaped single quote */ 107 *r++ = '\''; 108 *r++ = '\''; /* start new quoted string */ 109 } 110 } 111 112 *r++ = '\''; 113 *r = '\0'; 114 115 return (result); 116} 117 118/* Set the environment variables LINES and COLUMNS to lines and cols, 119 respectively. */ 120void 121sh_set_lines_and_columns (lines, cols) 122 int lines, cols; 123{ 124 char *b; 125 126#if defined (HAVE_PUTENV) 127 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("LINES=") + 1); 128 sprintf (b, "LINES=%d", lines); 129 putenv (b); 130 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + sizeof ("COLUMNS=") + 1); 131 sprintf (b, "COLUMNS=%d", cols); 132 putenv (b); 133#else /* !HAVE_PUTENV */ 134# if defined (HAVE_SETENV) 135 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1); 136 sprintf (b, "%d", lines); 137 setenv ("LINES", b, 1); 138 b = (char *)xmalloc (INT_STRLEN_BOUND (int) + 1); 139 sprintf (b, "%d", cols); 140 setenv ("COLUMNS", b, 1); 141# endif /* HAVE_SETENV */ 142#endif /* !HAVE_PUTENV */ 143} 144 145char * 146sh_get_env_value (varname) 147 const char *varname; 148{ 149 return ((char *)getenv (varname)); 150} 151 152char * 153sh_get_home_dir () 154{ 155 char *home_dir; 156 struct passwd *entry; 157 158 home_dir = (char *)NULL; 159 entry = getpwuid (getuid ()); 160 if (entry) 161 home_dir = entry->pw_dir; 162 return (home_dir); 163} 164 165#if !defined (O_NDELAY) 166# if defined (FNDELAY) 167# define O_NDELAY FNDELAY 168# endif 169#endif 170 171int 172sh_unset_nodelay_mode (fd) 173 int fd; 174{ 175 int flags, bflags; 176 177 if ((flags = fcntl (fd, F_GETFL, 0)) < 0) 178 return -1; 179 180 bflags = 0; 181 182#ifdef O_NONBLOCK 183 bflags |= O_NONBLOCK; 184#endif 185 186#ifdef O_NDELAY 187 bflags |= O_NDELAY; 188#endif 189 190 if (flags & bflags) 191 { 192 flags &= ~bflags; 193 return (fcntl (fd, F_SETFL, flags)); 194 } 195 196 return 0; 197} 198