src/shell.h

   1 /* shell.h -- The data structures used by the shell */
   2
   3 /* Copyright (C) 1993-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bush, the Bourne Again SHell.
   6
   7    Bush is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bush is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "bushjmp.h"
  26
  27 #include "lxrgmr/command.h"
  28 #include "syntax.h"
  29 #include "general.h"
  30 #include "error.h"
  31 #include "var/variables.h"
  32 #include "var/arrayfunc.h"
  33 #include "quit.h"
  34 #include "maxpath.h"
  35 #include "runner/unwind_prot.h"
  36 #include "lxrgmr/dispose_cmd.h"
  37 #include "lxrgmr/make_cmd.h"
  38 #include "ocache.h"
  39 #include "lxrgmr/subst.h"
  40 #include "sig.h"
  41 #include "pathnames.h"
  42 #include "externs.h"
  43
  44 extern int EOF_Reached;
  45
  46 #define NO_PIPE -1
  47 #define REDIRECT_BOTH -2
  48
  49 #define NO_VARIABLE -1
  50
  51 /* Values that can be returned by execute_command (). */
  52 #define EXECUTION_FAILURE 1
  53 #define EXECUTION_SUCCESS 0
  54
  55 /* Usage messages by builtins result in a return status of 2. */
  56 #define EX_BADUSAGE     2
  57
  58 #define EX_MISCERROR    2
  59
  60 /* Special exit statuses used by the shell, internally and externally. */
  61 #define EX_RETRYFAIL    124
  62 #define EX_WEXPCOMSUB   125
  63 #define EX_BINARY_FILE  126
  64 #define EX_NOEXEC       126
  65 #define EX_NOINPUT      126
  66 #define EX_NOTFOUND     127
  67
  68 #define EX_SHERRBASE    256     /* all special error values are > this. */
  69
  70 #define EX_BADSYNTAX    257     /* shell syntax error */
  71 #define EX_USAGE        258     /* syntax error in usage */
  72 #define EX_REDIRFAIL    259     /* redirection failed */
  73 #define EX_BADASSIGN    260     /* variable assignment error */
  74 #define EX_EXPFAIL      261     /* word expansion failed */
  75 #define EX_DISKFALLBACK 262     /* fall back to disk command from builtin */
  76
  77 /* Flag values that control parameter pattern substitution. */
  78 #define MATCH_ANY       0x000
  79 #define MATCH_BEG       0x001
  80 #define MATCH_END       0x002
  81
  82 #define MATCH_TYPEMASK  0x003
  83
  84 #define MATCH_GLOBREP   0x010
  85 #define MATCH_QUOTED    0x020
  86 #define MATCH_ASSIGNRHS 0x040
  87 #define MATCH_STARSUB   0x080
  88
  89 /* Some needed external declarations. */
  90 extern char **shell_environment;
  91 extern WORD_LIST *rest_of_args;
  92
  93 /* Generalized global variables. */
  94 extern char *command_execution_string;
  95
  96 extern int debugging_mode;
  97 extern int executing, login_shell;
  98 extern int interactive, interactive_shell;
  99 extern int startup_state;
 100 extern int reading_shell_script;
 101 extern int shell_initialized;
 102 extern int bush_argv_initialized;
 103 extern int subshell_environment;
 104 extern int current_command_number;
 105 extern int indirection_level;
 106 extern int shell_compatibility_level;
 107 extern int running_under_emacs;
 108
 109 extern int posixly_correct;
 110 extern int no_line_editing;
 111
 112 extern char *shell_name;
 113 extern char *current_host_name;
 114
 115 extern int subshell_argc;
 116 extern char **subshell_argv;
 117 extern char **subshell_envp;
 118
 119 /* variables managed using shopt */
 120 extern int hup_on_exit;
 121 extern int check_jobs_at_exit;
 122 extern int autocd;
 123 extern int check_window_size;
 124
 125 /* from version.c */
 126 extern int build_version, patch_level;
 127 extern char *dist_version, *release_status;
 128
 129 extern int locale_mb_cur_max;
 130 extern int locale_utf8locale;
 131
 132 /* Structure to pass around that holds a bitmap of file descriptors
 133    to close, and the size of that structure.  Used in execute_cmd.c. */
 134 struct fd_bitmap {
 135   int size;
 136   char *bitmap;
 137 };
 138
 139 #define FD_BITMAP_SIZE 32
 140
 141 #define CTLESC '\001'
 142 #define CTLNUL '\177'
 143
 144 /* Information about the current user. */
 145 struct user_info {
 146   uid_t uid, euid;
 147   gid_t gid, egid;
 148   char *user_name;
 149   char *shell;          /* shell from the password file */
 150   char *home_dir;
 151 };
 152
 153 extern struct user_info current_user;
 154
 155 /* Force gcc to not clobber X on a longjmp().  Old versions of gcc mangle
 156    this badly. */
 157 #if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ > 8)
 158 #  define USE_VAR(x)    ((void) &(x))
 159 #else
 160 #  define USE_VAR(x)
 161 #endif
 162
 163 #define HEREDOC_MAX 16
 164
 165 /* Structure in which to save partial parsing state when doing things like
 166    PROMPT_COMMAND and bush_execute_unix_command execution. */
 167
 168 typedef struct _sh_parser_state_t {
 169
 170   /* parsing state */
 171   int parser_state;
 172   int *token_state;
 173
 174   char *token;
 175   int token_buffer_size;
 176
 177   /* input line state -- line number saved elsewhere */
 178   int input_line_terminator;
 179   int eof_encountered;
 180
 181 #if defined (HANDLE_MULTIBYTE)
 182   /* Nothing right now for multibyte state, but might want something later. */
 183 #endif
 184
 185   char **prompt_string_pointer;
 186
 187   /* history state affecting or modified by the parser */
 188   int current_command_line_count;
 189 #if defined (HISTORY)
 190   int remember_on_history;
 191   int history_expansion_inhibited;
 192 #endif
 193
 194   /* execution state possibly modified by the parser */
 195   int last_command_exit_value;
 196 #if defined (ARRAY_VARS)
 197   ARRAY *pipestatus;
 198 #endif
 199   sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
 200
 201   /* flags state affecting the parser */
 202   int expand_aliases;
 203   int echo_input_at_read;
 204   int need_here_doc;
 205   int here_doc_first_line;
 206
 207   /* structures affecting the parser */
 208   REDIRECT *redir_stack[HEREDOC_MAX];
 209 } sh_parser_state_t;
 210
 211 typedef struct _sh_input_line_state_t {
 212   char *input_line;
 213   size_t input_line_index;
 214   size_t input_line_size;
 215   size_t input_line_len;
 216 #if defined (HANDLE_MULTIBYTE)
 217   char *input_property;
 218   size_t input_propsize;
 219 #endif
 220 } sh_input_line_state_t;
 221
 222 /* Let's try declaring these here. */
 223 extern char *parser_remaining_input PARAMS((void));
 224
 225 extern sh_parser_state_t *save_parser_state PARAMS((sh_parser_state_t *));
 226 extern void restore_parser_state PARAMS((sh_parser_state_t *));
 227
 228 extern sh_input_line_state_t *save_input_line_state PARAMS((sh_input_line_state_t *));
 229 extern void restore_input_line_state PARAMS((sh_input_line_state_t *));
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254