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   VFunction *errfunc;
  79
  80   fd = open (filename, O_RDONLY);
  81
  82   if (fd < 0 || (fstat (fd, &finfo) == -1))
  83     {
  84 file_error_and_exit:
  85       if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
  86         file_error (filename);
  87
  88       if (flags & FEVAL_LONGJMP)
  89         {
  90           last_command_exit_value = 1;
  91           jump_to_top_level (EXITPROG);
  92         }
  93
  94       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
  95                                       : ((errno == ENOENT) ? 0 : -1));
  96     }
  97
  98   errfunc = (VFunction *)((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
  99
 100   if (S_ISDIR (finfo.st_mode))
 101     {
 102       (*errfunc) ("%s: is a directory", filename);
 103       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 104     }
 105   else if (S_ISREG (finfo.st_mode) == 0)
 106     {
 107       (*errfunc) ("%s: not a regular file", filename);
 108       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 109     }
 110
 111   string = xmalloc (1 + (int)finfo.st_size);
 112   result = read (fd, string, finfo.st_size);
 113   string[result] = '\0';
 114
 115   return_val = errno;
 116   close (fd);
 117   errno = return_val;
 118
 119   if (result != (int)finfo.st_size)
 120     {
 121       free (string);
 122       goto file_error_and_exit;
 123     }
 124
 125   if (check_binary_file ((unsigned char *)string, (result > 80) ? 80 : result))
 126     {
 127       free (string);
 128       (*errfunc) ("%s: cannot execute binary file", filename);
 129       return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
 130     }
 131
 132   if (flags & FEVAL_UNWINDPROT)
 133     {
 134       begin_unwind_frame ("_evalfile");
 135
 136       unwind_protect_int (return_catch_flag);
 137       unwind_protect_jmp_buf (return_catch);
 138       if (flags & FEVAL_NONINT)
 139         unwind_protect_int (interactive);
 140       unwind_protect_int (sourcelevel);
 141     }
 142   else
 143     {
 144       COPY_PROCENV (return_catch, old_return_catch);
 145       if (flags & FEVAL_NONINT)
 146         old_interactive = interactive;
 147     }
 148
 149   if (flags & FEVAL_NONINT)
 150     interactive = 0;
 151
 152   return_catch_flag++;
 153   sourcelevel++;
 154
 155   /* set the flags to be passed to parse_and_execute */
 156   pflags = (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
 157
 158   if (flags & FEVAL_BUILTIN)
 159     result = EXECUTION_SUCCESS;
 160
 161   return_val = setjmp (return_catch);
 162
 163   /* If `return' was seen outside of a function, but in the script, then
 164      force parse_and_execute () to clean up. */
 165   if (return_val)
 166     {
 167       parse_and_execute_cleanup ();
 168       result = return_catch_value;
 169     }
 170   else
 171     result = parse_and_execute (string, filename, pflags);
 172
 173   if (flags & FEVAL_UNWINDPROT)
 174     run_unwind_frame ("_evalfile");
 175   else
 176     {
 177       if (flags & FEVAL_NONINT)
 178         interactive = old_interactive;
 179       return_catch_flag--;
 180       sourcelevel--;
 181       COPY_PROCENV (old_return_catch, return_catch);
 182     }
 183
 184   return ((flags & FEVAL_BUILTIN) ? result : 1);
 185 }
 186
 187 int
 188 maybe_execute_file (fname, force_noninteractive)
 189      char *fname;
 190      int force_noninteractive;
 191 {
 192   char *filename;
 193   int result, flags;
 194
 195   filename = bash_tilde_expand (fname);
 196   flags = FEVAL_ENOENTOK;
 197   if (force_noninteractive)
 198     flags |= FEVAL_NONINT;
 199   result = _evalfile (filename, flags);
 200   free (filename);
 201   return result;
 202 }
 203
 204 #if defined (HISTORY)
 205 int
 206 fc_execute_file (filename)
 207      char *filename;
 208 {
 209   int flags;
 210
 211   /* We want these commands to show up in the history list if
 212      remember_on_history is set. */
 213   flags = FEVAL_ENOENTOK|FEVAL_HISTORY;
 214   return (_evalfile (filename, flags));
 215 }
 216 #endif /* HISTORY */
 217
 218 int
 219 source_file (filename)
 220      char *filename;
 221 {
 222   int flags;
 223
 224   flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
 225   /* POSIX shells exit if non-interactive and file error. */
 226   if (posixly_correct && !interactive_shell)
 227     flags |= FEVAL_LONGJMP;
 228   return (_evalfile (filename, flags));
 229 }