625 lines
14 KiB
C
625 lines
14 KiB
C
/* Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <sys/types.h>
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#if defined (HAVE_VPRINTF)
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#include <varargs.h>
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#endif /* VPRINTF */
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#include "../shell.h"
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#include "../unwind_prot.h"
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#include "../maxpath.h"
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#include "../jobs.h"
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#include "../builtins.h"
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#include "hashcom.h"
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void no_args (), remember_args (), parse_and_execute_cleanup ();
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extern int follow_symbolic_links, interactive;
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/* Read a numeric arg for this_command_name, the name of the shell builtin
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that wants it. LIST is the word list that the arg is to come from. */
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int
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get_numeric_arg (list)
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WORD_LIST *list;
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{
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int count = 1;
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if (list)
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{
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if (sscanf (list->word->word, "%d", &count) != 1)
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{
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builtin_error ("bad non-numeric arg `%s'", list->word->word);
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throw_to_top_level ();
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}
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no_args (list->next);
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}
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return (count);
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}
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/* This is a lot like report_error (), but it is for shell builtins
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instead of shell control structures, and it won't ever exit the
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shell. */
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#if defined (HAVE_VPRINTF)
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/* VARARGS */
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builtin_error (va_alist)
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va_dcl
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{
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extern char *this_command_name;
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char *format;
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va_list args;
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if (this_command_name && *this_command_name)
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fprintf (stderr, "%s: ", this_command_name);
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va_start (args);
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format = va_arg (args, char *);
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vfprintf (stderr, format, args);
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va_end (args);
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fprintf (stderr, "\n");
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}
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#else /* Without VARARGS. */
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builtin_error (format, arg1, arg2, arg3, arg4, arg5)
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char *format, *arg1, *arg2, *arg3, *arg4, *arg5;
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{
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extern char *this_command_name;
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if (this_command_name && *this_command_name)
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fprintf (stderr, "%s: ", this_command_name);
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fprintf (stderr, format, arg1, arg2, arg3, arg4, arg5);
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fprintf (stderr, "\n");
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fflush (stderr);
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}
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#endif /* HAVE_VPRINTF */
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/* Remember LIST in $0 ... $9, and REST_OF_ARGS. If DESTRUCTIVE is
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non-zero, then discard whatever the existing arguments are, else
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only discard the ones that are to be replaced. */
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void
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remember_args (list, destructive)
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WORD_LIST *list;
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int destructive;
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{
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register int i;
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extern WORD_LIST *copy_word_list ();
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for (i = 1; i < 10; i++)
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{
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if (destructive && dollar_vars[i])
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{
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free (dollar_vars[i]);
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dollar_vars[i] = (char *)NULL;
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}
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if (list)
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{
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if (!destructive && dollar_vars[i])
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free (dollar_vars[i]);
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dollar_vars[i] = savestring (list->word->word);
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list = list->next;
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}
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}
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/* If arguments remain, assign them to REST_OF_ARGS. */
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if (!list)
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{
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dispose_words (rest_of_args);
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rest_of_args = NULL;
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}
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else
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{
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rest_of_args = (WORD_LIST *)copy_word_list (list);
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}
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}
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/* Return if LIST is NULL else barf and jump to top_level. */
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void
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no_args (list)
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WORD_LIST *list;
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{
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if (list)
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{
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builtin_error ("extra arguments");
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longjmp (top_level, DISCARD);
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}
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}
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/* Return the octal number parsed from STRING, or -1 to indicate
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that the string contained a bad number. */
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int
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read_octal (string)
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char *string;
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{
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int result = 0;
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int digits = 0;
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while (*string && *string >= '0' && *string < '8')
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{
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digits++;
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result = (result * 8) + *string++ - '0';
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}
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if (!digits || result > 0777 || *string)
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result = -1;
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return (result);
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}
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/* Temporary static. */
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char *dotted_filename = (char *)NULL;
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/* Return the full pathname that FILENAME hashes to. If FILENAME
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is hashed, but data->check_dot is non-zero, check ./FILENAME
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and return that if it is executable. */
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char *
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find_hashed_filename (filename)
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char *filename;
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{
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extern HASH_TABLE *hashed_filenames;
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extern int hashing_disabled;
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register BUCKET_CONTENTS *item;
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if (hashing_disabled)
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return ((char *)NULL);
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item = find_hash_item (filename, hashed_filenames);
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if (item)
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{
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/* If this filename is hashed, but `.' comes before it in the path,
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then see if `./filename' is an executable. */
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if (pathdata(item)->check_dot)
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{
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if (dotted_filename)
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free (dotted_filename);
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dotted_filename = (char *)xmalloc (3 + strlen (filename));
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strcpy (dotted_filename, "./");
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strcat (dotted_filename, filename);
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if (executable_file (dotted_filename))
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return (dotted_filename);
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/* Watch out. If this file was hashed to "./filename", and
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"./filename" is not executable, then return NULL. */
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/* Since we already know "./filename" is not executable, what
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we're really interested in is whether or not the `path'
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portion of the hashed filename is equivalent to the current
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directory, but only if it starts with a `.'. (This catches
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./. and so on.) same_file () is in execute_cmd.c; it tests
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general Unix file equivalence -- same device and inode. */
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{
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char *path = pathdata (item)->path;
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if (*path == '.')
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{
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int same = 0;
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char *rindex (), *tail;
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tail = rindex (path, '/');
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if (tail)
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{
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*tail = '\0';
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same = same_file
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(".", path, (struct stat *)NULL, (struct stat *)NULL);
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*tail = '/';
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}
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if (same)
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return ((char *)NULL);
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}
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}
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}
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return (pathdata (item)->path);
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}
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else
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return ((char *)NULL);
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}
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/* **************************************************************** */
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/* */
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/* Pushing and Popping a Context */
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/* */
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/* **************************************************************** */
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WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL;
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int dollar_arg_stack_slots = 0;
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int dollar_arg_stack_index = 0;
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void push_dollar_vars (), pop_dollar_vars ();
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void
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push_context ()
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{
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extern int variable_context;
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push_dollar_vars ();
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variable_context++;
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}
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void
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pop_context ()
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{
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extern int variable_context;
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pop_dollar_vars ();
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kill_all_local_variables ();
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variable_context--;
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}
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/* Save the existing positional parameters on a stack. */
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void
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push_dollar_vars ()
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{
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extern WORD_LIST *list_rest_of_args ();
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if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots)
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{
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if (!dollar_arg_stack)
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{
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dollar_arg_stack =
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(WORD_LIST **)xrealloc (dollar_arg_stack,
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(dollar_arg_stack_slots += 10)
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* sizeof (WORD_LIST **));
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}
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}
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dollar_arg_stack[dollar_arg_stack_index] = list_rest_of_args ();
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dollar_arg_stack[++dollar_arg_stack_index] = (WORD_LIST *)NULL;
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}
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/* Restore the positional parameters from our stack. */
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void
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pop_dollar_vars ()
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{
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if (!dollar_arg_stack || !dollar_arg_stack_index)
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return;
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remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1);
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dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
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dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
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}
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/* Function called when one of the builtin commands detects a bad
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option. */
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bad_option (s)
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char *s;
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{
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builtin_error ("unknown option: %s", s);
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}
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/* Return a consed string which is the current working directory.
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FOR_WHOM is the name of the caller for error printing. */
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char *the_current_working_directory = (char *)NULL;
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char *
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get_working_directory (for_whom)
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char *for_whom;
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{
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if (!follow_symbolic_links)
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{
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if (the_current_working_directory)
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free (the_current_working_directory);
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the_current_working_directory = (char *)NULL;
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}
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if (!the_current_working_directory)
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{
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char *directory, *getwd ();
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the_current_working_directory = (char *)xmalloc (MAXPATHLEN);
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directory = getwd (the_current_working_directory);
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if (!directory)
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{
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fprintf (stderr, "%s: %s\n\r",
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for_whom, the_current_working_directory);
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free (the_current_working_directory);
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the_current_working_directory = (char *)NULL;
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return (char *)NULL;
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}
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}
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return (savestring (the_current_working_directory));
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}
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#if defined (JOB_CONTROL)
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/* Return the job spec found in LIST. */
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get_job_spec (list)
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WORD_LIST *list;
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{
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register char *word;
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int job = NO_JOB;
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int substring = 0;
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if (!list)
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return (current_job);
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word = list->word->word;
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if (!*word)
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return (current_job);
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if (*word == '%')
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word++;
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if (digit (*word) && (sscanf (word, "%d", &job) == 1))
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return (job - 1);
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switch (*word)
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{
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case 0:
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case '%':
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case '+':
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return (current_job);
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case '-':
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return (previous_job);
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case '?': /* Substring search requested. */
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substring++;
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word++;
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goto find_string;
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default:
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find_string:
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{
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register int i, wl = strlen (word);
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for (i = 0; i < job_slots; i++)
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{
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if (jobs[i])
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{
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register PROCESS *p = jobs[i]->pipe;
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extern char *strindex ();
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do
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{
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if ((substring && strindex (p->command, word)) ||
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(strncmp (p->command, word, wl) == 0))
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if (job != NO_JOB)
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{
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builtin_error ("ambigious job spec: %s", word);
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return (DUP_JOB);
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}
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else
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job = i;
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p = p->next;
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}
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while (p != jobs[i]->pipe);
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}
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}
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return (job);
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}
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}
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}
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#endif /* JOB_CONTROL */
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/* The command name of the currently running function. */
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extern char *this_command_name;
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int parse_and_execute_level = 0;
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/* How to force parse_and_execute () to clean up after itself. */
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void
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parse_and_execute_cleanup ()
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{
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run_unwind_frame ("parse_and_execute_top");
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}
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/* Parse and execute the commands in STRING. Returns whatever
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execute_command () returns. This frees STRING. */
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int
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parse_and_execute (string, from_file)
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char *string;
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char *from_file;
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{
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extern int remember_on_history;
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extern int history_expansion_inhibited;
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extern int indirection_level;
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extern int builtin_pipe_in, builtin_pipe_out;
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extern COMMAND *global_command;
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extern char *indirection_level_string ();
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extern int pop_stream (), free ();
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int last_result = EXECUTION_SUCCESS;
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int code, jump_to_top_level = 0;
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char *orig_string = string;
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/* Unwind protect this invocation of parse_and_execute (). */
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begin_unwind_frame ("parse_and_execute_top");
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unwind_protect_int (parse_and_execute_level);
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unwind_protect_jmp_buf (top_level);
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unwind_protect_int (indirection_level);
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unwind_protect_int (interactive);
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unwind_protect_int (remember_on_history);
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unwind_protect_int (history_expansion_inhibited);
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add_unwind_protect (pop_stream, (char *)NULL);
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if (orig_string)
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add_unwind_protect (free, orig_string);
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end_unwind_frame ();
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parse_and_execute_level++;
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push_stream ();
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interactive = 0;
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indirection_level++;
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/* We don't remember text read by the shell this way on
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the history list, and we don't use !$ in shell scripts. */
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remember_on_history = 0;
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history_expansion_inhibited = 1;
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with_input_from_string (string, from_file);
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{
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extern char *yy_input_dev;
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COMMAND *command;
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while (*yy_input_dev)
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{
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if (interrupt_state)
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{
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last_result = EXECUTION_FAILURE;
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break;
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}
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/* Provide a location for functions which `longjmp (top_level)' to
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jump to. This prevents errors in substitution from restarting
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the reader loop directly, for example. */
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if (code = setjmp (top_level))
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{
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switch (code)
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{
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case FORCE_EOF:
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case EXITPROG:
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run_unwind_frame ("pe_dispose");
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/* Remember to call longjmp (top_level) after the old
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value for it is restored. */
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jump_to_top_level = 1;
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goto out;
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case DISCARD:
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run_unwind_frame ("pe_dispose");
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continue;
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default:
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programming_error ("bad jump to top_level: %d", code);
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break;
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}
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}
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if (parse_command () == 0)
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{
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if ((command = global_command) != (COMMAND *)NULL)
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{
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extern struct fd_bitmap *new_fd_bitmap ();
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extern void dispose_fd_bitmap ();
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struct fd_bitmap *bitmap;
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bitmap = new_fd_bitmap (FD_BITMAP_SIZE);
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begin_unwind_frame ("pe_dispose");
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add_unwind_protect (dispose_fd_bitmap, bitmap);
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global_command = (COMMAND *)NULL;
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if (builtin_pipe_in != NO_PIPE)
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bitmap->bitmap[builtin_pipe_in] = 1;
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if (builtin_pipe_out != NO_PIPE)
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bitmap->bitmap[builtin_pipe_out] = 1;
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last_result =
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execute_command_internal
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(command, 0, NO_PIPE, NO_PIPE, bitmap);
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dispose_command (command);
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run_unwind_frame ("pe_dispose");
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}
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}
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else
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{
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last_result = EXECUTION_FAILURE;
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/* Since we are shell compatible, syntax errors in a script
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abort the execution of the script. Right? */
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break;
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}
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}
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}
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out:
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run_unwind_frame ("parse_and_execute_top");
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if (interrupt_state && parse_and_execute_level == 0)
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throw_to_top_level ();
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if (jump_to_top_level)
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longjmp (top_level, code);
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return (last_result);
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}
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/* Return the address of the builtin named NAME.
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DISABLED_OKAY means find it even if the builtin is disabled. */
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Function *
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builtin_address_internal (name, disabled_okay)
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char *name;
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int disabled_okay;
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{
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int hi, lo, mid, j;
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hi = num_shell_builtins - 1;
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lo = 0;
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while (lo <= hi)
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{
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mid = (lo + hi) / 2;
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j = strcmp (shell_builtins[mid].name, name);
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if (j == 0)
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{
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if (shell_builtins[mid].function &&
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(shell_builtins[mid].enabled || disabled_okay))
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|
return (shell_builtins[mid].function);
|
|
else
|
|
return ((Function *)NULL);
|
|
}
|
|
if (j > 0)
|
|
hi = mid - 1;
|
|
else
|
|
lo = mid + 1;
|
|
}
|
|
return ((Function *)NULL);
|
|
}
|
|
|
|
/* Perform a binary search and return the address of the builtin function
|
|
whose name is NAME. If the function couldn't be found, or the builtin
|
|
is disabled or has no function associated with it, return NULL. */
|
|
Function *
|
|
find_shell_builtin (name)
|
|
char *name;
|
|
{
|
|
return (builtin_address_internal (name, 0));
|
|
}
|
|
|
|
/* Return the address of builtin with NAME, irregardless of its state of
|
|
enableness. */
|
|
Function *
|
|
builtin_address (name)
|
|
char *name;
|
|
{
|
|
return (builtin_address_internal (name, 1));
|
|
}
|
|
|
|
static int
|
|
shell_builtin_compare (sbp1, sbp2)
|
|
struct builtin *sbp1, *sbp2;
|
|
{
|
|
return (strcmp (sbp1->name, sbp2->name));
|
|
}
|
|
|
|
/* Sort the table of shell builtins so that the binary search will work
|
|
in find_shell_builtin. */
|
|
initialize_shell_builtins ()
|
|
{
|
|
qsort (shell_builtins, num_shell_builtins, sizeof (struct builtin),
|
|
shell_builtin_compare);
|
|
}
|