builtins/evalfile.c

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2
   3    This file is part of GNU Bash, the Bourne Again SHell.
   4
   5    Bash is free software; you can redistribute it and/or modify it under
   6    the terms of the GNU General Public License as published by the Free
   7    Software Foundation; either version 1, or (at your option) any later
   8    version.
   9
  10    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  11    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13    for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with Bash; see the file COPYING.  If not, write to the Free Software
  17    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  18
  19 #include <config.h>
  20
  21 #if defined (HAVE_UNISTD_H)
  22 #  include <unistd.h>
  23 #endif
  24
  25 #include "../bashtypes.h"
  26 #include "../posixstat.h"
  27 #include "../filecntl.h"
  28
  29 #include <stdio.h>
  30 #include <signal.h>
  31 #include <errno.h>
  32
  33 #include "../bashansi.h"
  34
  35 #include "../shell.h"
  36 #include "../jobs.h"
  37 #include "../builtins.h"
  38 #include "../flags.h"
  39 #include "../input.h"
  40 #include "../execute_cmd.h"
  41
  42 #if defined (HISTORY)
  43 #  include "../bashhist.h"
  44 #endif
  45
  46 #include "common.h"
  47
  48 #if !defined (errno)
  49 extern int errno;
  50 #endif
  51
  52 /* Flags for _evalfile() */
  53 #define FEVAL_ENOENTOK          0x001
  54 #define FEVAL_BUILTIN           0x002
  55 #define FEVAL_UNWINDPROT        0x004
  56 #define FEVAL_NONINT            0x008
  57 #define FEVAL_LONGJMP           0x010
  58 #define FEVAL_HISTORY           0x020
  59
  60 extern int interactive, interactive_shell, posixly_correct;
  61 extern int indirection_level, startup_state, subshell_environment;
  62 extern int return_catch_flag, return_catch_value;
  63 extern int last_command_exit_value;
  64
  65 /* How many `levels' of sourced files we have. */
  66 int sourcelevel = 0;
  67
  68 static int
  69 _evalfile (filename, flags)
  70      char *filename;
  71      int flags;
  72 {
  73   volatile int old_interactive;
  74   procenv_t old_return_catch;
  75   int return_val, fd, result, pflags;
  76   char *string;
  77   struct stat finfo;
  78   size_t file_size;
  79   VFunction *errfunc;
  80
  81   fd = open (filename, O_RDONLY);
  82
  83   if (fd < 0 || (fstat (fd, &finfo) == -1))
  84     {
  85 file_error_and_exit:
  86       if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
  87         file_error (filename);
  88
  89       if (flags & FEVAL_LONGJMP)
  90         {
  91           last_command_exit_value = 1;
  92           jump_to_top_level (EXITPROG);
  93         }
  94
  95       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
  96                                       : ((errno == ENOENT) ? 0 : -1));
  97     }
  98
  99   errfunc = (VFunction *)((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
 100
 101   if (S_ISDIR (finfo.st_mode))
 102     {
 103       (*errfunc) ("%s: is a directory", filename);
 104       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 105     }
 106   else if (S_ISREG (finfo.st_mode) == 0)
 107     {
 108       (*errfunc) ("%s: not a regular file", filename);
 109       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 110     }
 111
 112   file_size = (size_t)finfo.st_size;
 113   /* Check for overflow with large files. */
 114   if (file_size != finfo.st_size || file_size + 1 < file_size)
 115     {
 116       (*errfunc) ("%s: file is too large", filename);
 117       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 118     }
 119   string = xmalloc (1 + file_size);
 120   result = read (fd, string, file_size);
 121   string[result] = '\0';
 122
 123   return_val = errno;
 124   close (fd);
 125   errno = return_val;
 126
 127   if (result < 0)               /* XXX was != file_size, not < 0 */
 128     {
 129       free (string);
 130       goto file_error_and_exit;
 131     }
 132
 133   if (result == 0)
 134     {
 135       free (string);
 136       return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
 137     }
 138
 139   if (check_binary_file ((unsigned char *)string, (result > 80) ? 80 : result))
 140     {
 141       free (string);
 142       (*errfunc) ("%s: cannot execute binary file", filename);
 143       return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
 144     }
 145
 146   if (flags & FEVAL_UNWINDPROT)
 147     {
 148       begin_unwind_frame ("_evalfile");
 149
 150       unwind_protect_int (return_catch_flag);
 151       unwind_protect_jmp_buf (return_catch);
 152       if (flags & FEVAL_NONINT)
 153         unwind_protect_int (interactive);
 154       unwind_protect_int (sourcelevel);
 155     }
 156   else
 157     {
 158       COPY_PROCENV (return_catch, old_return_catch);
 159       if (flags & FEVAL_NONINT)
 160         old_interactive = interactive;
 161     }
 162
 163   if (flags & FEVAL_NONINT)
 164     interactive = 0;
 165
 166   return_catch_flag++;
 167   sourcelevel++;
 168
 169   /* set the flags to be passed to parse_and_execute */
 170   pflags = (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
 171
 172   if (flags & FEVAL_BUILTIN)
 173     result = EXECUTION_SUCCESS;
 174
 175   return_val = setjmp (return_catch);
 176
 177   /* If `return' was seen outside of a function, but in the script, then
 178      force parse_and_execute () to clean up. */
 179   if (return_val)
 180     {
 181       parse_and_execute_cleanup ();
 182       result = return_catch_value;
 183     }
 184   else
 185     result = parse_and_execute (string, filename, pflags);
 186
 187   if (flags & FEVAL_UNWINDPROT)
 188     run_unwind_frame ("_evalfile");
 189   else
 190     {
 191       if (flags & FEVAL_NONINT)
 192         interactive = old_interactive;
 193       return_catch_flag--;
 194       sourcelevel--;
 195       COPY_PROCENV (old_return_catch, return_catch);
 196     }
 197
 198   return ((flags & FEVAL_BUILTIN) ? result : 1);
 199 }
 200
 201 int
 202 maybe_execute_file (fname, force_noninteractive)
 203      char *fname;
 204      int force_noninteractive;
 205 {
 206   char *filename;
 207   int result, flags;
 208
 209   filename = bash_tilde_expand (fname);
 210   flags = FEVAL_ENOENTOK;
 211   if (force_noninteractive)
 212     flags |= FEVAL_NONINT;
 213   result = _evalfile (filename, flags);
 214   free (filename);
 215   return result;
 216 }
 217
 218 #if defined (HISTORY)
 219 int
 220 fc_execute_file (filename)
 221      char *filename;
 222 {
 223   int flags;
 224
 225   /* We want these commands to show up in the history list if
 226      remember_on_history is set. */
 227   flags = FEVAL_ENOENTOK|FEVAL_HISTORY;
 228   return (_evalfile (filename, flags));
 229 }
 230 #endif /* HISTORY */
 231
 232 int
 233 source_file (filename)
 234      char *filename;
 235 {
 236   int flags;
 237
 238   flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
 239   /* POSIX shells exit if non-interactive and file error. */
 240   if (posixly_correct && !interactive_shell)
 241     flags |= FEVAL_LONGJMP;
 242   return (_evalfile (filename, flags));
 243 }