| 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) 1997-2009,2017 Free Software Foundation, Inc. |
| 5 | |
| 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. |
| 8 | |
| 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. |
| 13 | |
| 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. |
| 18 | |
| 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/>. |
| 21 | */ |
| 22 | |
| 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 | #if defined (HAVE_LIMITS_H) |
| 48 | # include <limits.h> |
| 49 | #endif |
| 50 | |
| 51 | #if defined (HAVE_FCNTL_H) |
| 52 | #include <fcntl.h> |
| 53 | #endif |
| 54 | #if defined (HAVE_PWD_H) |
| 55 | #include <pwd.h> |
| 56 | #endif |
| 57 | |
| 58 | #include <stdio.h> |
| 59 | |
| 60 | #include "rlstdc.h" |
| 61 | #include "rlshell.h" |
| 62 | #include "rldefs.h" |
| 63 | |
| 64 | #include "xmalloc.h" |
| 65 | |
| 66 | #if defined (HAVE_GETPWUID) && !defined (HAVE_GETPW_DECLS) |
| 67 | extern struct passwd *getpwuid PARAMS((uid_t)); |
| 68 | #endif /* HAVE_GETPWUID && !HAVE_GETPW_DECLS */ |
| 69 | |
| 70 | #ifndef NULL |
| 71 | # define NULL 0 |
| 72 | #endif |
| 73 | |
| 74 | #ifndef CHAR_BIT |
| 75 | # define CHAR_BIT 8 |
| 76 | #endif |
| 77 | |
| 78 | /* Nonzero if the integer type T is signed. */ |
| 79 | #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) |
| 80 | |
| 81 | /* Bound on length of the string representing an integer value of type T. |
| 82 | Subtract one for the sign bit if T is signed; |
| 83 | 302 / 1000 is log10 (2) rounded up; |
| 84 | add one for integer division truncation; |
| 85 | add one more for a minus sign if t is signed. */ |
| 86 | #define INT_STRLEN_BOUND(t) \ |
| 87 | ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \ |
| 88 | + 1 + TYPE_SIGNED (t)) |
| 89 | |
| 90 | /* All of these functions are resolved from bash if we are linking readline |
| 91 | as part of bash. */ |
| 92 | |
| 93 | /* Does shell-like quoting using single quotes. */ |
| 94 | char * |
| 95 | sh_single_quote (char *string) |
| 96 | { |
| 97 | register int c; |
| 98 | char *result, *r, *s; |
| 99 | |
| 100 | result = (char *)xmalloc (3 + (4 * strlen (string))); |
| 101 | r = result; |
| 102 | *r++ = '\''; |
| 103 | |
| 104 | for (s = string; s && (c = *s); s++) |
| 105 | { |
| 106 | *r++ = c; |
| 107 | |
| 108 | if (c == '\'') |
| 109 | { |
| 110 | *r++ = '\\'; /* insert escaped single quote */ |
| 111 | *r++ = '\''; |
| 112 | *r++ = '\''; /* start new quoted string */ |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | *r++ = '\''; |
| 117 | *r = '\0'; |
| 118 | |
| 119 | return (result); |
| 120 | } |
| 121 | |
| 122 | /* Set the environment variables LINES and COLUMNS to lines and cols, |
| 123 | respectively. */ |
| 124 | static char setenv_buf[INT_STRLEN_BOUND (int) + 1]; |
| 125 | static char putenv_buf1[INT_STRLEN_BOUND (int) + 6 + 1]; /* sizeof("LINES=") == 6 */ |
| 126 | static char putenv_buf2[INT_STRLEN_BOUND (int) + 8 + 1]; /* sizeof("COLUMNS=") == 8 */ |
| 127 | |
| 128 | void |
| 129 | sh_set_lines_and_columns (int lines, int cols) |
| 130 | { |
| 131 | #if defined (HAVE_SETENV) |
| 132 | sprintf (setenv_buf, "%d", lines); |
| 133 | setenv ("LINES", setenv_buf, 1); |
| 134 | |
| 135 | sprintf (setenv_buf, "%d", cols); |
| 136 | setenv ("COLUMNS", setenv_buf, 1); |
| 137 | #else /* !HAVE_SETENV */ |
| 138 | # if defined (HAVE_PUTENV) |
| 139 | sprintf (putenv_buf1, "LINES=%d", lines); |
| 140 | putenv (putenv_buf1); |
| 141 | |
| 142 | sprintf (putenv_buf2, "COLUMNS=%d", cols); |
| 143 | putenv (putenv_buf2); |
| 144 | # endif /* HAVE_PUTENV */ |
| 145 | #endif /* !HAVE_SETENV */ |
| 146 | } |
| 147 | |
| 148 | char * |
| 149 | sh_get_env_value (const char *varname) |
| 150 | { |
| 151 | return ((char *)getenv (varname)); |
| 152 | } |
| 153 | |
| 154 | char * |
| 155 | sh_get_home_dir (void) |
| 156 | { |
| 157 | static char *home_dir = (char *)NULL; |
| 158 | struct passwd *entry; |
| 159 | |
| 160 | if (home_dir) |
| 161 | return (home_dir); |
| 162 | |
| 163 | home_dir = (char *)NULL; |
| 164 | #if defined (HAVE_GETPWUID) |
| 165 | # if defined (__TANDEM) |
| 166 | entry = getpwnam (getlogin ()); |
| 167 | # else |
| 168 | entry = getpwuid (getuid ()); |
| 169 | # endif |
| 170 | if (entry) |
| 171 | home_dir = savestring (entry->pw_dir); |
| 172 | #endif |
| 173 | |
| 174 | #if defined (HAVE_GETPWENT) |
| 175 | endpwent (); /* some systems need this */ |
| 176 | #endif |
| 177 | |
| 178 | return (home_dir); |
| 179 | } |
| 180 | |
| 181 | #if !defined (O_NDELAY) |
| 182 | # if defined (FNDELAY) |
| 183 | # define O_NDELAY FNDELAY |
| 184 | # endif |
| 185 | #endif |
| 186 | |
| 187 | int |
| 188 | sh_unset_nodelay_mode (int fd) |
| 189 | { |
| 190 | #if defined (HAVE_FCNTL) |
| 191 | int flags, bflags; |
| 192 | |
| 193 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) |
| 194 | return -1; |
| 195 | |
| 196 | bflags = 0; |
| 197 | |
| 198 | #ifdef O_NONBLOCK |
| 199 | bflags |= O_NONBLOCK; |
| 200 | #endif |
| 201 | |
| 202 | #ifdef O_NDELAY |
| 203 | bflags |= O_NDELAY; |
| 204 | #endif |
| 205 | |
| 206 | if (flags & bflags) |
| 207 | { |
| 208 | flags &= ~bflags; |
| 209 | return (fcntl (fd, F_SETFL, flags)); |
| 210 | } |
| 211 | #endif |
| 212 | |
| 213 | return 0; |
| 214 | } |