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