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flags.c
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C/C++ Source or Header
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1991-06-05
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6KB
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220 lines
/* flags.c -- Everything about flags except the `set' command. That
is in builtins.c */
/* Copyright (C) 1987,1989 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Flags hacking. */
#define NULL 0x0
#include "flags.h"
#include "config.h"
#include "general.h"
#include "quit.h"
/* **************************************************************** */
/* */
/* The Standard Sh Flags. */
/* */
/* **************************************************************** */
/* Non-zero means automatically mark variables which are modified or created
as auto export variables. */
int mark_modified_vars = 0;
/* Non-zero means exit immediately if a command exits with a non-zero
exit status. */
int exit_immediately_on_error = 0;
/* Non-zero means disable filename globbing. */
int disallow_filename_globbing = 0;
/* Non-zero means to locate and remember function commands as functions are
defined. Function commands are normally located when the function is
executed. */
int locate_commands_in_functions = 0;
/* Non-zero means that all keyword arguments are placed into the environment
for a command, not just those that appear on the line before the command
name. */
int place_keywords_in_env = 0;
/* Non-zero means read commands, but don't execute tham. This is useful
for debugging shell scripts that should do something hairy and possibly
desctructive. */
int read_but_dont_execute = 0;
/* Non-zero means end of file is after one command. */
int just_one_command = 0;
/* Non-zero means trying to get the value of $i where $i is undefined
causes an error, instead of a null substitution. */
int unbound_vars_is_error = 0;
/* Non-zero means type out input lines after you read them. */
int echo_input_at_read = 0;
/* Non-zero means type out the command definition after reading, but
before executing. */
int echo_command_at_execute = 0;
/* Non-zero means turn off the job control features. */
int jobs_m_flag = 0;
/* Non-zero means this shell is interactive, even if running under a
pipe. */
int forced_interactive = 0;
/* **************************************************************** */
/* */
/* Non-Standard Flags Follow Here. */
/* */
/* **************************************************************** */
/* Non-zero means do lexical scoping in the body of a FOR command. */
int lexical_scoping = 0;
/* Non-zero means no such thing as invisible variables. */
int no_invisible_vars = 0;
/* Non-zero means don't look up or remember command names in a hash table, */
int hashing_disabled = 0;
/* Non-zero means that we are doing history expansion. The default.
This means !22 gets the 22nd line of history. */
int history_expansion = 1;
/* **************************************************************** */
/* */
/* The Flags ALIST. */
/* */
/* **************************************************************** */
struct flags_alist shell_flags[] = {
/* Standard sh flags. */
{"a", &mark_modified_vars},
{"e", &exit_immediately_on_error},
{"f", &disallow_filename_globbing},
{"h", &locate_commands_in_functions}, /* Oh, yeah, good mnemonic. */
{"i", &forced_interactive},
{"k", &place_keywords_in_env},
{"n", &read_but_dont_execute},
{"t", &just_one_command},
{"u", &unbound_vars_is_error},
{"v", &echo_input_at_read},
{"x", &echo_command_at_execute},
#ifdef JOB_CONTROL
{"m", &jobs_m_flag},
#endif
/* New flags that control non-standard things. */
{"l", &lexical_scoping},
{"I", &no_invisible_vars},
/* I want `h', but locate_commands_in_functions has it. Great. */
{"d", &hashing_disabled},
/* Once again, we don't have the right mnemonic. */
{"o", &history_expansion},
{(char *)NULL, (int *)NULL}
};
int *
find_flag (name)
char *name;
{
int i = 0;
while (shell_flags[i].name) {
if (strcmp (shell_flags[i].name, name) == 0)
return (shell_flags[i].value);
i++;
}
return ((int *)FLAG_ERROR);
}
/* Change the state of a flag, and return it's original value, or return
FLAG_ERROR if there is no flag called NAME. ON_OR_OFF should be one
of FLAG_ON or FLAG_OFF. */
/* With FLAG being a character. */
change_flag_char (flag, on_or_off)
int flag;
int on_or_off;
{
char name[2];
name[0] = flag; name[1] = '\0';
return (change_flag (name, on_or_off));
}
/* With FLAG being a string. */
change_flag (flag, on_or_off)
char *flag;
int on_or_off;
{
int *value = find_flag (flag);
int old_value;
if (value == (int *)FLAG_ERROR) return (FLAG_ERROR);
else old_value = *value;
if (on_or_off == FLAG_ON)
*value = 1;
else
{
if (on_or_off == FLAG_OFF)
*value = 0;
else
return (FLAG_ERROR);
}
#ifdef JOB_CONTROL
/* Special hack for the -m flag. */
if (value == &jobs_m_flag)
{
extern set_job_control ();
set_job_control (on_or_off == '-');
}
#endif /* JOB_CONTROL */
return (old_value);
}
/* Return a string which is the names of all the currently
set shell flags. */
char *
which_set_flags ()
{
char *temp =
(char *)xmalloc (1 + sizeof (shell_flags) / (2 * sizeof (char *)));
int index, string_index = 0;
for (index = 0; shell_flags[index].name; index++)
if (*(shell_flags[index].value))
temp[string_index++] = *(shell_flags[index].name);
temp[string_index] = '\0';
return (temp);
}