1 /* evalfile.c - read and evaluate commands from a file or file descriptor */
3 /* Copyright (C) 1996-2009 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash 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.
12 Bash 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.
17 You should have received a copy of the GNU General Public License
18 along with Bash. If not, see <http://www.gnu.org/licenses/>.
23 #if defined (HAVE_UNISTD_H)
27 #include "../bashtypes.h"
28 #include "posixstat.h"
35 #include "../bashansi.h"
36 #include "../bashintl.h"
40 #include "../builtins.h"
43 #include "../execute_cmd.h"
47 # include "../bashhist.h"
58 /* Flags for _evalfile() */
59 #define FEVAL_ENOENTOK 0x001
60 #define FEVAL_BUILTIN 0x002
61 #define FEVAL_UNWINDPROT 0x004
62 #define FEVAL_NONINT 0x008
63 #define FEVAL_LONGJMP 0x010
64 #define FEVAL_HISTORY 0x020
65 #define FEVAL_CHECKBINARY 0x040
66 #define FEVAL_REGFILE 0x080
67 #define FEVAL_NOPUSHARGS 0x100
69 extern int posixly_correct;
70 extern int indirection_level, subshell_environment;
71 extern int return_catch_flag, return_catch_value;
72 extern int last_command_exit_value;
73 extern int executing_command_builtin;
75 /* How many `levels' of sourced files we have. */
79 _evalfile (filename, flags)
83 volatile int old_interactive;
84 procenv_t old_return_catch;
85 int return_val, fd, result, pflags, i, nnull;
86 ssize_t nr; /* return value from read(2) */
90 sh_vmsg_func_t *errfunc;
91 #if defined (ARRAY_VARS)
92 SHELL_VAR *funcname_v, *nfv, *bash_source_v, *bash_lineno_v;
93 ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
94 # if defined (DEBUGGER)
95 SHELL_VAR *bash_argv_v, *bash_argc_v;
96 ARRAY *bash_argv_a, *bash_argc_a;
103 #if defined (ARRAY_VARS)
104 GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
105 GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
106 GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
107 # if defined (DEBUGGER)
108 GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
109 GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
113 fd = open (filename, O_RDONLY);
115 if (fd < 0 || (fstat (fd, &finfo) == -1))
118 if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
119 file_error (filename);
121 if (flags & FEVAL_LONGJMP)
123 last_command_exit_value = 1;
124 jump_to_top_level (EXITPROG);
127 return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
128 : ((errno == ENOENT) ? 0 : -1));
131 errfunc = ((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
133 if (S_ISDIR (finfo.st_mode))
135 (*errfunc) (_("%s: is a directory"), filename);
136 return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
138 else if ((flags & FEVAL_REGFILE) && S_ISREG (finfo.st_mode) == 0)
140 (*errfunc) (_("%s: not a regular file"), filename);
141 return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
144 file_size = (size_t)finfo.st_size;
145 /* Check for overflow with large files. */
146 if (file_size != finfo.st_size || file_size + 1 < file_size)
148 (*errfunc) (_("%s: file is too large"), filename);
149 return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
152 if (S_ISREG (finfo.st_mode) && file_size <= SSIZE_MAX)
154 string = (char *)xmalloc (1 + file_size);
155 nr = read (fd, string, file_size);
160 nr = zmapfd (fd, &string, 0);
166 if (nr < 0) /* XXX was != file_size, not < 0 */
169 goto file_error_and_exit;
175 return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
178 if ((flags & FEVAL_CHECKBINARY) &&
179 check_binary_file (string, (nr > 80) ? 80 : nr))
182 (*errfunc) (_("%s: cannot execute binary file"), filename);
183 return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
189 for (nnull = i = 0; i < nr; i++)
190 if (string[i] == '\0')
192 memmove (string+i, string+i+1, nr - i);
194 /* Even if the `check binary' flag is not set, we want to avoid
195 sourcing files with more than 256 null characters -- that
196 probably indicates a binary file. */
197 if ((flags & FEVAL_BUILTIN) && ++nnull > 256)
200 (*errfunc) (_("%s: cannot execute binary file"), filename);
201 return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
206 if (flags & FEVAL_UNWINDPROT)
208 begin_unwind_frame ("_evalfile");
210 unwind_protect_int (return_catch_flag);
211 unwind_protect_jmp_buf (return_catch);
212 if (flags & FEVAL_NONINT)
213 unwind_protect_int (interactive);
214 unwind_protect_int (sourcelevel);
218 COPY_PROCENV (return_catch, old_return_catch);
219 if (flags & FEVAL_NONINT)
220 old_interactive = interactive;
223 if (flags & FEVAL_NONINT)
229 #if defined (ARRAY_VARS)
230 array_push (bash_source_a, (char *)filename);
231 t = itos (executing_line_number ());
232 array_push (bash_lineno_a, t);
234 array_push (funcname_a, "source"); /* not exactly right */
235 # if defined (DEBUGGER)
236 /* Have to figure out a better way to do this when `source' is supplied
238 if ((flags & FEVAL_NOPUSHARGS) == 0)
240 array_push (bash_argv_a, (char *)filename);
241 tt[0] = '1'; tt[1] = '\0';
242 array_push (bash_argc_a, tt);
247 /* set the flags to be passed to parse_and_execute */
248 pflags = SEVAL_RESETLINE;
249 pflags |= (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
251 if (flags & FEVAL_BUILTIN)
252 result = EXECUTION_SUCCESS;
254 return_val = setjmp (return_catch);
256 /* If `return' was seen outside of a function, but in the script, then
257 force parse_and_execute () to clean up. */
260 parse_and_execute_cleanup ();
261 result = return_catch_value;
264 result = parse_and_execute (string, filename, pflags);
266 if (flags & FEVAL_UNWINDPROT)
267 run_unwind_frame ("_evalfile");
270 if (flags & FEVAL_NONINT)
271 interactive = old_interactive;
274 COPY_PROCENV (old_return_catch, return_catch);
277 #if defined (ARRAY_VARS)
278 /* These two variables cannot be unset, and cannot be affected by the
280 array_pop (bash_source_a);
281 array_pop (bash_lineno_a);
283 /* FUNCNAME can be unset, and so can potentially be changed by the
285 GET_ARRAY_FROM_VAR ("FUNCNAME", nfv, funcname_a);
286 if (nfv == funcname_v)
287 array_pop (funcname_a);
288 # if defined (DEBUGGER)
289 if ((flags & FEVAL_NOPUSHARGS) == 0)
291 array_pop (bash_argc_a);
292 array_pop (bash_argv_a);
297 return ((flags & FEVAL_BUILTIN) ? result : 1);
301 maybe_execute_file (fname, force_noninteractive)
303 int force_noninteractive;
308 filename = bash_tilde_expand (fname, 0);
309 flags = FEVAL_ENOENTOK;
310 if (force_noninteractive)
311 flags |= FEVAL_NONINT;
312 result = _evalfile (filename, flags);
317 #if defined (HISTORY)
319 fc_execute_file (filename)
320 const char *filename;
324 /* We want these commands to show up in the history list if
325 remember_on_history is set. */
326 flags = FEVAL_ENOENTOK|FEVAL_HISTORY|FEVAL_REGFILE;
327 return (_evalfile (filename, flags));
332 source_file (filename, sflags)
333 const char *filename;
338 flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
340 flags |= FEVAL_NOPUSHARGS;
341 /* POSIX shells exit if non-interactive and file error. */
342 if (posixly_correct && interactive_shell == 0 && executing_command_builtin == 0)
343 flags |= FEVAL_LONGJMP;
344 rval = _evalfile (filename, flags);