builtins/evalfile.c

   1 /* Copyright (C) 1996-2003 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 #include "../bashintl.h"
  35
  36 #include "../shell.h"
  37 #include "../jobs.h"
  38 #include "../builtins.h"
  39 #include "../flags.h"
  40 #include "../input.h"
  41 #include "../execute_cmd.h"
  42
  43 #if defined (HISTORY)
  44 #  include "../bashhist.h"
  45 #endif
  46
  47 #include "common.h"
  48
  49 #if !defined (errno)
  50 extern int errno;
  51 #endif
  52
  53 /* Flags for _evalfile() */
  54 #define FEVAL_ENOENTOK          0x001
  55 #define FEVAL_BUILTIN           0x002
  56 #define FEVAL_UNWINDPROT        0x004
  57 #define FEVAL_NONINT            0x008
  58 #define FEVAL_LONGJMP           0x010
  59 #define FEVAL_HISTORY           0x020
  60 #define FEVAL_CHECKBINARY       0x040
  61 #define FEVAL_REGFILE           0x080
  62 #define FEVAL_NOPUSHARGS        0x100
  63
  64 extern int posixly_correct;
  65 extern int indirection_level, startup_state, subshell_environment;
  66 extern int return_catch_flag, return_catch_value;
  67 extern int last_command_exit_value;
  68
  69 /* How many `levels' of sourced files we have. */
  70 int sourcelevel = 0;
  71
  72 static int
  73 _evalfile (filename, flags)
  74      const char *filename;
  75      int flags;
  76 {
  77   volatile int old_interactive;
  78   procenv_t old_return_catch;
  79   int return_val, fd, result, pflags;
  80   char *string;
  81   struct stat finfo;
  82   size_t file_size;
  83   sh_vmsg_func_t *errfunc;
  84 #if defined (ARRAY_VARS)
  85   SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
  86   ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
  87 #  if defined (DEBUGGER)
  88   SHELL_VAR *bash_argv_v, *bash_argc_v;
  89   ARRAY *bash_argv_a, *bash_argc_a;
  90 #  endif
  91   char *t, tt[2];
  92 #endif
  93
  94   USE_VAR(pflags);
  95
  96 #if defined (ARRAY_VARS)
  97   GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
  98   GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
  99   GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
 100 #  if defined (DEBUGGER)
 101   GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
 102   GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
 103 #  endif
 104 #endif
 105
 106   fd = open (filename, O_RDONLY);
 107
 108   if (fd < 0 || (fstat (fd, &finfo) == -1))
 109     {
 110 file_error_and_exit:
 111       if (((flags & FEVAL_ENOENTOK) == 0) || errno != ENOENT)
 112         file_error (filename);
 113
 114       if (flags & FEVAL_LONGJMP)
 115         {
 116           last_command_exit_value = 1;
 117           jump_to_top_level (EXITPROG);
 118         }
 119
 120       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE
 121                                       : ((errno == ENOENT) ? 0 : -1));
 122     }
 123
 124   errfunc = ((flags & FEVAL_BUILTIN) ? builtin_error : internal_error);
 125
 126   if (S_ISDIR (finfo.st_mode))
 127     {
 128       (*errfunc) (_("%s: is a directory"), filename);
 129       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 130     }
 131   else if ((flags & FEVAL_REGFILE) && S_ISREG (finfo.st_mode) == 0)
 132     {
 133       (*errfunc) (_("%s: not a regular file"), filename);
 134       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 135     }
 136
 137   file_size = (size_t)finfo.st_size;
 138   /* Check for overflow with large files. */
 139   if (file_size != finfo.st_size || file_size + 1 < file_size)
 140     {
 141       (*errfunc) (_("%s: file is too large"), filename);
 142       return ((flags & FEVAL_BUILTIN) ? EXECUTION_FAILURE : -1);
 143     }
 144
 145 #if defined (__CYGWIN__) && defined (O_TEXT)
 146   setmode (fd, O_TEXT);
 147 #endif
 148
 149   string = (char *)xmalloc (1 + file_size);
 150   result = read (fd, string, file_size);
 151   string[result] = '\0';
 152
 153   return_val = errno;
 154   close (fd);
 155   errno = return_val;
 156
 157   if (result < 0)               /* XXX was != file_size, not < 0 */
 158     {
 159       free (string);
 160       goto file_error_and_exit;
 161     }
 162
 163   if (result == 0)
 164     {
 165       free (string);
 166       return ((flags & FEVAL_BUILTIN) ? EXECUTION_SUCCESS : 1);
 167     }
 168
 169   if ((flags & FEVAL_CHECKBINARY) &&
 170       check_binary_file (string, (result > 80) ? 80 : result))
 171     {
 172       free (string);
 173       (*errfunc) ("%s: cannot execute binary file", filename);
 174       return ((flags & FEVAL_BUILTIN) ? EX_BINARY_FILE : -1);
 175     }
 176
 177   if (flags & FEVAL_UNWINDPROT)
 178     {
 179       begin_unwind_frame ("_evalfile");
 180
 181       unwind_protect_int (return_catch_flag);
 182       unwind_protect_jmp_buf (return_catch);
 183       if (flags & FEVAL_NONINT)
 184         unwind_protect_int (interactive);
 185       unwind_protect_int (sourcelevel);
 186     }
 187   else
 188     {
 189       COPY_PROCENV (return_catch, old_return_catch);
 190       if (flags & FEVAL_NONINT)
 191         old_interactive = interactive;
 192     }
 193
 194   if (flags & FEVAL_NONINT)
 195     interactive = 0;
 196
 197   return_catch_flag++;
 198   sourcelevel++;
 199
 200 #if defined (ARRAY_VARS)
 201   array_push (bash_source_a, (char *)filename);
 202   t = itos (executing_line_number ());
 203   array_push (bash_lineno_a, t);
 204   free (t);
 205   array_push (funcname_a, "source");    /* not exactly right */
 206 #  if defined (DEBUGGER)
 207   /* Have to figure out a better way to do this when `source' is supplied
 208      arguments */
 209   if ((flags & FEVAL_NOPUSHARGS) == 0)
 210     {
 211       array_push (bash_argv_a, (char *)filename);
 212       tt[0] = '1'; tt[1] = '\0';
 213       array_push (bash_argc_a, tt);
 214     }
 215 #  endif
 216 #endif
 217
 218   /* set the flags to be passed to parse_and_execute */
 219   pflags = SEVAL_RESETLINE;
 220   pflags |= (flags & FEVAL_HISTORY) ? 0 : SEVAL_NOHIST;
 221
 222   if (flags & FEVAL_BUILTIN)
 223     result = EXECUTION_SUCCESS;
 224
 225   return_val = setjmp (return_catch);
 226
 227   /* If `return' was seen outside of a function, but in the script, then
 228      force parse_and_execute () to clean up. */
 229   if (return_val)
 230     {
 231       parse_and_execute_cleanup ();
 232       result = return_catch_value;
 233     }
 234   else
 235     result = parse_and_execute (string, filename, pflags);
 236
 237   if (flags & FEVAL_UNWINDPROT)
 238     run_unwind_frame ("_evalfile");
 239   else
 240     {
 241       if (flags & FEVAL_NONINT)
 242         interactive = old_interactive;
 243       return_catch_flag--;
 244       sourcelevel--;
 245       COPY_PROCENV (old_return_catch, return_catch);
 246     }
 247
 248 #if defined (ARRAY_VARS)
 249   array_pop (bash_source_a);
 250   array_pop (bash_lineno_a);
 251   array_pop (funcname_a);
 252 #  if defined (DEBUGGER)
 253   if ((flags & FEVAL_NOPUSHARGS) == 0)
 254     {
 255       array_pop (bash_argc_a);
 256       array_pop (bash_argv_a);
 257     }
 258 #  endif
 259 #endif
 260
 261   return ((flags & FEVAL_BUILTIN) ? result : 1);
 262 }
 263
 264 int
 265 maybe_execute_file (fname, force_noninteractive)
 266      const char *fname;
 267      int force_noninteractive;
 268 {
 269   char *filename;
 270   int result, flags;
 271
 272   filename = bash_tilde_expand (fname, 0);
 273   flags = FEVAL_ENOENTOK;
 274   if (force_noninteractive)
 275     flags |= FEVAL_NONINT;
 276   result = _evalfile (filename, flags);
 277   free (filename);
 278   return result;
 279 }
 280
 281 #if defined (HISTORY)
 282 int
 283 fc_execute_file (filename)
 284      const char *filename;
 285 {
 286   int flags;
 287
 288   /* We want these commands to show up in the history list if
 289      remember_on_history is set. */
 290   flags = FEVAL_ENOENTOK|FEVAL_HISTORY|FEVAL_REGFILE;
 291   return (_evalfile (filename, flags));
 292 }
 293 #endif /* HISTORY */
 294
 295 int
 296 source_file (filename, sflags)
 297      const char *filename;
 298      int sflags;
 299 {
 300   int flags, rval;
 301
 302   flags = FEVAL_BUILTIN|FEVAL_UNWINDPROT|FEVAL_NONINT;
 303   if (sflags)
 304     flags |= FEVAL_NOPUSHARGS;
 305   /* POSIX shells exit if non-interactive and file error. */
 306   if (posixly_correct && !interactive_shell)
 307     flags |= FEVAL_LONGJMP;
 308   rval = _evalfile (filename, flags);
 309
 310   run_return_trap ();
 311   return rval;
 312 }