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 2, 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, 59 Temple Place, Suite 330, Boston, MA 02111 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 #define FEVAL_CHECKBINARY       0x040
  60
  61 extern int interactive, interactive_shell, posixly_correct;
  62 extern int indirection_level, startup_state, subshell_environment;
  63 extern int return_catch_flag, return_catch_value;
  64 extern int last_command_exit_value;
  65
  66 /* How many `levels' of sourced files we have. */
  67 int sourcelevel = 0;
  68
  69 static int
  70 _evalfile (filename, flags)
  71      char *filename;
  72      int flags;
  73 {
  74   volatile int old_interactive;
  75   procenv_t old_return_catch;
  76   int return_val, fd, result, pflags;
  77   char *string;
  78   struct stat finfo;
  79   size_t file_size;
  80   VFunction *errfunc;
  81
  82   fd = open (filename, O_RDONLY);
  83
  84   if (fd < 0 || (fstat (fd, &finfo) == -1))
  85     {
  86 file_error_and_exit:
  87       if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
  88         file_error (filename);
  89
  90       if (flags & FEVAL_LONGJMP)
  91         {
  92           last_command_exit_value = 1;
  93           jump_to_top_level (EXITPROG);
  94         }
  95
  96       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
  97                                       : ((errno == ENOENT) ? 0 : -1));
  98     }
  99
 100   errfunc = (VFunction *)((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
 101
 102   if (S_ISDIR (finfo.st_mode))
 103     {
 104       (*errfunc) ("%s: is a directory", filename);
 105       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 106     }
 107   else if (S_ISREG (finfo.st_mode) == 0)
 108     {
 109       (*errfunc) ("%s: not a regular file", filename);
 110       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 111     }
 112
 113   file_size = (size_t)finfo.st_size;
 114   /* Check for overflow with large files. */
 115   if (file_size != finfo.st_size || file_size + 1 < file_size)
 116     {
 117       (*errfunc) ("%s: file is too large", filename);
 118       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 119     }
 120
 121 #if defined (__CYGWIN__) && defined (O_TEXT)
 122   setmode (fd, O_TEXT);
 123 #endif
 124
 125   string = xmalloc (1 + file_size);
 126   result = read (fd, string, file_size);
 127   string[result] = '\0';
 128
 129   return_val = errno;
 130   close (fd);
 131   errno = return_val;
 132
 133   if (result < 0)               /* XXX was != file_size, not < 0 */
 134     {
 135       free (string);
 136       goto file_error_and_exit;
 137     }
 138
 139   if (result == 0)
 140     {
 141       free (string);
 142       return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
 143     }
 144
 145   if ((flags & FEVAL_CHECKBINARY) &&
 146       check_binary_file ((unsigned char *)string, (result > 80) ? 80 : result))
 147     {
 148       free (string);
 149       (*errfunc) ("%s: cannot execute binary file", filename);
 150       return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
 151     }
 152
 153   if (flags & FEVAL_UNWINDPROT)
 154     {
 155       begin_unwind_frame ("_evalfile");
 156
 157       unwind_protect_int (return_catch_flag);
 158       unwind_protect_jmp_buf (return_catch);
 159       if (flags & FEVAL_NONINT)
 160         unwind_protect_int (interactive);
 161       unwind_protect_int (sourcelevel);
 162     }
 163   else
 164     {
 165       COPY_PROCENV (return_catch, old_return_catch);
 166       if (flags & FEVAL_NONINT)
 167         old_interactive = interactive;
 168     }
 169
 170   if (flags & FEVAL_NONINT)
 171     interactive = 0;
 172
 173   return_catch_flag++;
 174   sourcelevel++;
 175
 176   /* set the flags to be passed to parse_and_execute */
 177   pflags = (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
 178
 179   if (flags & FEVAL_BUILTIN)
 180     result = EXECUTION_SUCCESS;
 181
 182   return_val = setjmp (return_catch);
 183
 184   /* If `return' was seen outside of a function, but in the script, then
 185      force parse_and_execute () to clean up. */
 186   if (return_val)
 187     {
 188       parse_and_execute_cleanup ();
 189       result = return_catch_value;
 190     }
 191   else
 192     result = parse_and_execute (string, filename, pflags);
 193
 194   if (flags & FEVAL_UNWINDPROT)
 195     run_unwind_frame ("_evalfile");
 196   else
 197     {
 198       if (flags & FEVAL_NONINT)
 199         interactive = old_interactive;
 200       return_catch_flag--;
 201       sourcelevel--;
 202       COPY_PROCENV (old_return_catch, return_catch);
 203     }
 204
 205   return ((flags & FEVAL_BUILTIN) ? result : 1);
 206 }
 207
 208 int
 209 maybe_execute_file (fname, force_noninteractive)
 210      char *fname;
 211      int force_noninteractive;
 212 {
 213   char *filename;
 214   int result, flags;
 215
 216   filename = bash_tilde_expand (fname);
 217   flags = FEVAL_ENOENTOK;
 218   if (force_noninteractive)
 219     flags |= FEVAL_NONINT;
 220   result = _evalfile (filename, flags);
 221   free (filename);
 222   return result;
 223 }
 224
 225 #if defined (HISTORY)
 226 int
 227 fc_execute_file (filename)
 228      char *filename;
 229 {
 230   int flags;
 231
 232   /* We want these commands to show up in the history list if
 233      remember_on_history is set. */
 234   flags = FEVAL_ENOENTOK|FEVAL_HISTORY;
 235   return (_evalfile (filename, flags));
 236 }
 237 #endif /* HISTORY */
 238
 239 int
 240 source_file (filename)
 241      char *filename;
 242 {
 243   int flags;
 244
 245   flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
 246   /* POSIX shells exit if non-interactive and file error. */
 247   if (posixly_correct && !interactive_shell)
 248     flags |= FEVAL_LONGJMP;
 249   return (_evalfile (filename, flags));
 250 }