initial import from bash_3.1dfsg.orig.tar.gz

1 files changed, 353 insertions, 0 deletions

diff --git a/builtins/evalstring.c b/builtins/evalstring.c
new file mode 100644
index 0000000..04afac3
--- /dev/null
+++ b/builtins/evalstring.c
@@ -0,0 +1,353 @@
+/* Evaluate a string as one or more shell commands.
+
+   Copyright (C) 1996-2005 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 2, or (at your option) any later
+   version.
+
+   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+   
+   You should have received a copy of the GNU General Public License along
+   with Bash; see the file COPYING.  If not, write to the Free Software
+   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+#  ifdef _MINIX
+#    include <sys/types.h>
+#  endif
+#  include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <signal.h>
+
+#include <errno.h>
+
+#include "filecntl.h"
+#include "../bashansi.h"
+
+#include "../shell.h"
+#include "../jobs.h"
+#include "../builtins.h"
+#include "../flags.h"
+#include "../input.h"
+#include "../execute_cmd.h"
+#include "../redir.h"
+#include "../trap.h"
+
+#if defined (HISTORY)
+#  include "../bashhist.h"
+#endif
+
+#include "common.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#define IS_BUILTIN(s)	(builtin_address_internal(s, 0) != (struct builtin *)NULL)
+
+extern int indirection_level, startup_state, subshell_environment;
+extern int line_number;
+extern int last_command_exit_value;
+extern int running_trap;
+extern int loop_level;
+extern int posixly_correct;
+
+int parse_and_execute_level = 0;
+
+static int cat_file __P((REDIRECT *));
+
+/* How to force parse_and_execute () to clean up after itself. */
+void
+parse_and_execute_cleanup ()
+{
+  if (running_trap)
+    {
+      run_trap_cleanup (running_trap - 1);
+      unfreeze_jobs_list ();
+    }
+  run_unwind_frame ("parse_and_execute_top");
+}
+
+/* Parse and execute the commands in STRING.  Returns whatever
+   execute_command () returns.  This frees STRING.  FLAGS is a
+   flags word; look in common.h for the possible values.  Actions
+   are:
+   	(flags & SEVAL_NONINT) -> interactive = 0;
+   	(flags & SEVAL_INTERACT) -> interactive = 1;
+   	(flags & SEVAL_NOHIST) -> call bash_history_disable ()
+   	(flags & SEVAL_NOFREE) -> don't free STRING when finished
+   	(flags & SEVAL_RESETLINE) -> reset line_number to 1
+*/
+
+int
+parse_and_execute (string, from_file, flags)
+     char *string;
+     const char *from_file;
+     int flags;
+{
+  int code, x, lreset;
+  volatile int should_jump_to_top_level, last_result;
+  char *orig_string;
+  COMMAND *volatile command;
+
+  orig_string = string;
+  /* Unwind protect this invocation of parse_and_execute (). */
+  begin_unwind_frame ("parse_and_execute_top");
+  unwind_protect_int (parse_and_execute_level);
+  unwind_protect_jmp_buf (top_level);
+  unwind_protect_int (indirection_level);
+  unwind_protect_int (line_number);
+  unwind_protect_int (loop_level);
+  if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
+    unwind_protect_int (interactive);
+
+  lreset = flags & SEVAL_RESETLINE;
+
+#if defined (HISTORY)
+  unwind_protect_int (remember_on_history);	/* can be used in scripts */
+#  if defined (BANG_HISTORY)
+  if (interactive_shell)
+    {
+      unwind_protect_int (history_expansion_inhibited);
+    }
+#  endif /* BANG_HISTORY */
+#endif /* HISTORY */
+
+  if (interactive_shell)
+    {
+      x = get_current_prompt_level ();
+      add_unwind_protect (set_current_prompt_level, x);
+    }
+  
+  add_unwind_protect (pop_stream, (char *)NULL);
+  if (orig_string && ((flags & SEVAL_NOFREE) == 0))
+    add_unwind_protect (xfree, orig_string);
+  end_unwind_frame ();
+
+  parse_and_execute_level++;
+
+  /* Reset the line number if the caller wants us to.  If we don't reset the
+     line number, we have to subtract one, because we will add one just
+     before executing the next command (resetting the line number sets it to
+     0; the first line number is 1). */
+  push_stream (lreset);
+  if (lreset == 0)
+    line_number--;
+    
+  indirection_level++;
+  if (flags & (SEVAL_NONINT|SEVAL_INTERACT))
+    interactive = (flags & SEVAL_NONINT) ? 0 : 1;
+
+#if defined (HISTORY)
+  if (flags & SEVAL_NOHIST)
+    bash_history_disable ();
+#endif /* HISTORY */
+
+  code = should_jump_to_top_level = 0;
+  last_result = EXECUTION_SUCCESS;
+
+  with_input_from_string (string, from_file);
+  while (*(bash_input.location.string))
+    {
+      command = (COMMAND *)NULL;
+
+      if (interrupt_state)
+	{
+	  last_result = EXECUTION_FAILURE;
+	  break;
+	}
+
+      /* Provide a location for functions which `longjmp (top_level)' to
+	 jump to.  This prevents errors in substitution from restarting
+	 the reader loop directly, for example. */
+      code = setjmp (top_level);
+
+      if (code)
+	{
+	  should_jump_to_top_level = 0;
+	  switch (code)
+	    {
+	    case FORCE_EOF:
+	    case ERREXIT:
+	    case EXITPROG:
+	      if (command)
+		run_unwind_frame ("pe_dispose");
+	      /* Remember to call longjmp (top_level) after the old
+		 value for it is restored. */
+	      should_jump_to_top_level = 1;
+	      goto out;
+
+	    case DISCARD:
+	      if (command)
+		run_unwind_frame ("pe_dispose");
+	      last_result = last_command_exit_value = EXECUTION_FAILURE; /* XXX */
+	      if (subshell_environment)
+		{
+		  should_jump_to_top_level = 1;
+		  goto out;
+		}
+	      else
+		{
+#if 0
+		  dispose_command (command);	/* pe_dispose does this */
+#endif
+		  continue;
+		}
+
+	    default:
+	      command_error ("parse_and_execute", CMDERR_BADJUMP, code, 0);
+	      break;
+	    }
+	}
+	  
+      if (parse_command () == 0)
+	{
+	  if (interactive_shell == 0 && read_but_dont_execute)
+	    {
+	      last_result = EXECUTION_SUCCESS;
+	      dispose_command (global_command);
+	      global_command = (COMMAND *)NULL;
+	    }
+	  else if (command = global_command)
+	    {
+	      struct fd_bitmap *bitmap;
+
+	      bitmap = new_fd_bitmap (FD_BITMAP_SIZE);
+	      begin_unwind_frame ("pe_dispose");
+	      add_unwind_protect (dispose_fd_bitmap, bitmap);
+	      add_unwind_protect (dispose_command, command);	/* XXX */
+
+	      global_command = (COMMAND *)NULL;
+
+#if defined (ONESHOT)
+	      /*
+	       * IF
+	       *   we were invoked as `bash -c' (startup_state == 2) AND
+	       *   parse_and_execute has not been called recursively AND
+	       *   we're not running a trap AND
+	       *   we have parsed the full command (string == '\0') AND
+	       *   we have a simple command without redirections AND
+	       *   the command is not being timed AND
+	       *   the command's return status is not being inverted
+	       * THEN
+	       *   tell the execution code that we don't need to fork
+	       */
+	      if (startup_state == 2 && parse_and_execute_level == 1 &&
+		  running_trap == 0 &&
+		  *bash_input.location.string == '\0' &&
+		  command->type == cm_simple &&
+		  !command->redirects && !command->value.Simple->redirects &&
+		  ((command->flags & CMD_TIME_PIPELINE) == 0) &&
+		  ((command->flags & CMD_INVERT_RETURN) == 0))
+		{
+		  command->flags |= CMD_NO_FORK;
+		  command->value.Simple->flags |= CMD_NO_FORK;
+		}
+#endif /* ONESHOT */
+
+	      /* See if this is a candidate for $( <file ). */
+	      if (startup_state == 2 &&
+		  (subshell_environment & SUBSHELL_COMSUB) &&
+		  *bash_input.location.string == '\0' &&
+		  command->type == cm_simple && !command->redirects &&
+		  (command->flags & CMD_TIME_PIPELINE) == 0 &&
+		  command->value.Simple->words == 0 &&
+		  command->value.Simple->redirects &&
+		  command->value.Simple->redirects->next == 0 &&
+		  command->value.Simple->redirects->instruction == r_input_direction)
+		{
+		  int r;
+		  r = cat_file (command->value.Simple->redirects);
+		  last_result = (r < 0) ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
+		}
+	      else
+		last_result = execute_command_internal
+				(command, 0, NO_PIPE, NO_PIPE, bitmap);
+
+	      dispose_command (command);
+	      dispose_fd_bitmap (bitmap);
+	      discard_unwind_frame ("pe_dispose");
+	    }
+	}
+      else
+	{
+	  last_result = EXECUTION_FAILURE;
+
+	  /* Since we are shell compatible, syntax errors in a script
+	     abort the execution of the script.  Right? */
+	  break;
+	}
+    }
+
+ out:
+
+  run_unwind_frame ("parse_and_execute_top");
+
+  if (interrupt_state && parse_and_execute_level == 0)
+    {
+      /* An interrupt during non-interactive execution in an
+	 interactive shell (e.g. via $PROMPT_COMMAND) should
+	 not cause the shell to exit. */
+      interactive = interactive_shell;
+      throw_to_top_level ();
+    }
+
+  if (should_jump_to_top_level)
+    jump_to_top_level (code);
+
+  return (last_result);
+}
+
+/* Handle a $( < file ) command substitution.  This expands the filename,
+   returning errors as appropriate, then just cats the file to the standard
+   output. */
+static int
+cat_file (r)
+     REDIRECT *r;
+{
+  char lbuf[128], *fn;
+  int fd, rval;
+  ssize_t nr;
+
+  if (r->instruction != r_input_direction)
+    return -1;
+
+  /* Get the filename. */
+  if (posixly_correct && !interactive_shell)
+    disallow_filename_globbing++;
+  fn = redirection_expand (r->redirectee.filename);
+  if (posixly_correct && !interactive_shell)
+    disallow_filename_globbing--;
+
+  if (fn == 0)
+    {
+      redirection_error (r, AMBIGUOUS_REDIRECT);
+      return -1;
+    }
+
+  fd = open(fn, O_RDONLY);
+  if (fd < 0)
+    {
+      file_error (fn);
+      free (fn);
+      return -1;
+    }
+
+  rval = zcatfd (fd, 1, fn);
+
+  free (fn);
+  close (fd);
+
+  return (rval);
+}