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cosmopolitan/third_party/bash/builtins_set.c
Justine Tunney f4a2a65cc8
Add bash 5.2 to third_party
2023-12-11 07:38:17 -08:00

890 lines
23 KiB
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/* set.c, created from set.def. */
#line 22 "./set.def"
#include "config.h"
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/types.h>
# endif
# include <unistd.h>
#endif
#include <stdio.h>
#include "bashansi.h"
#include "bashintl.h"
#include "shell.h"
#include "parser.h"
#include "flags.h"
#include "common.h"
#include "bashgetopt.h"
#if defined (READLINE)
# include "input.h"
# include "bashline.h"
# include "third_party/readline/readline.h"
#endif
#if defined (HISTORY)
# include "bashhist.h"
#endif
#line 153 "./set.def"
typedef int setopt_set_func_t PARAMS((int, char *));
typedef int setopt_get_func_t PARAMS((char *));
static int find_minus_o_option PARAMS((char *));
static void print_minus_o_option PARAMS((char *, int, int));
static void print_all_shell_variables PARAMS((void));
static int set_ignoreeof PARAMS((int, char *));
static int set_posix_mode PARAMS((int, char *));
#if defined (READLINE)
static int set_edit_mode PARAMS((int, char *));
static int get_edit_mode PARAMS((char *));
#endif
#if defined (HISTORY)
static int bash_set_history PARAMS((int, char *));
#endif
static const char * const on = "on";
static const char * const off = "off";
static int previous_option_value;
/* A struct used to match long options for set -o to the corresponding
option letter or internal variable. The functions can be called to
dynamically generate values. If you add a new variable name here
that doesn't have a corresponding single-character option letter, make
sure to set the value appropriately in reset_shell_options. */
const struct {
char *name;
int letter;
int *variable;
setopt_set_func_t *set_func;
setopt_get_func_t *get_func;
} o_options[] = {
{ "allexport", 'a', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#if defined (BRACE_EXPANSION)
{ "braceexpand",'B', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#endif
#if defined (READLINE)
{ "emacs", '\0', (int *)NULL, set_edit_mode, get_edit_mode },
#endif
{ "errexit", 'e', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "errtrace", 'E', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "functrace", 'T', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "hashall", 'h', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#if defined (BANG_HISTORY)
{ "histexpand", 'H', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#endif /* BANG_HISTORY */
#if defined (HISTORY)
{ "history", '\0', &enable_history_list, bash_set_history, (setopt_get_func_t *)NULL },
#endif
{ "ignoreeof", '\0', &ignoreeof, set_ignoreeof, (setopt_get_func_t *)NULL },
{ "interactive-comments", '\0', &interactive_comments, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "keyword", 'k', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#if defined (JOB_CONTROL)
{ "monitor", 'm', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#endif
{ "noclobber", 'C', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "noexec", 'n', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "noglob", 'f', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#if defined (HISTORY)
{ "nolog", '\0', &dont_save_function_defs, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#endif
#if defined (JOB_CONTROL)
{ "notify", 'b', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#endif /* JOB_CONTROL */
{ "nounset", 'u', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "onecmd", 't', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "physical", 'P', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "pipefail", '\0', &pipefail_opt, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "posix", '\0', &posixly_correct, set_posix_mode, (setopt_get_func_t *)NULL },
{ "privileged", 'p', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{ "verbose", 'v', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
#if defined (READLINE)
{ "vi", '\0', (int *)NULL, set_edit_mode, get_edit_mode },
#endif
{ "xtrace", 'x', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
{(char *)NULL, 0 , (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
};
#define N_O_OPTIONS (sizeof (o_options) / sizeof (o_options[0]))
#define GET_BINARY_O_OPTION_VALUE(i, name) \
((o_options[i].get_func) ? (*o_options[i].get_func) (name) \
: (*o_options[i].variable))
#define SET_BINARY_O_OPTION_VALUE(i, onoff, name) \
((o_options[i].set_func) ? (*o_options[i].set_func) (onoff, name) \
: (*o_options[i].variable = (onoff == FLAG_ON)))
static int
find_minus_o_option (name)
char *name;
{
register int i;
for (i = 0; o_options[i].name; i++)
if (STREQ (name, o_options[i].name))
return i;
return -1;
}
int
minus_o_option_value (name)
char *name;
{
register int i;
int *on_or_off;
i = find_minus_o_option (name);
if (i < 0)
return (-1);
if (o_options[i].letter)
{
on_or_off = find_flag (o_options[i].letter);
return ((on_or_off == FLAG_UNKNOWN) ? -1 : *on_or_off);
}
else
return (GET_BINARY_O_OPTION_VALUE (i, name));
}
#define MINUS_O_FORMAT "%-15s\t%s\n"
static void
print_minus_o_option (name, value, pflag)
char *name;
int value, pflag;
{
if (pflag == 0)
printf (MINUS_O_FORMAT, name, value ? on : off);
else
printf ("set %co %s\n", value ? '-' : '+', name);
}
void
list_minus_o_opts (mode, reusable)
int mode, reusable;
{
register int i;
int *on_or_off, value;
for (i = 0; o_options[i].name; i++)
{
if (o_options[i].letter)
{
value = 0;
on_or_off = find_flag (o_options[i].letter);
if (on_or_off == FLAG_UNKNOWN)
on_or_off = &value;
if (mode == -1 || mode == *on_or_off)
print_minus_o_option (o_options[i].name, *on_or_off, reusable);
}
else
{
value = GET_BINARY_O_OPTION_VALUE (i, o_options[i].name);
if (mode == -1 || mode == value)
print_minus_o_option (o_options[i].name, value, reusable);
}
}
}
char **
get_minus_o_opts ()
{
char **ret;
int i;
ret = strvec_create (N_O_OPTIONS + 1);
for (i = 0; o_options[i].name; i++)
ret[i] = o_options[i].name;
ret[i] = (char *)NULL;
return ret;
}
char *
get_current_options ()
{
char *temp;
int i, posixopts;
posixopts = num_posix_options (); /* shopts modified by posix mode */
/* Make the buffer big enough to hold the set -o options and the shopt
options modified by posix mode. */
temp = (char *)xmalloc (1 + N_O_OPTIONS + posixopts);
for (i = 0; o_options[i].name; i++)
{
if (o_options[i].letter)
temp[i] = *(find_flag (o_options[i].letter));
else
temp[i] = GET_BINARY_O_OPTION_VALUE (i, o_options[i].name);
}
/* Add the shell options that are modified by posix mode to the end of the
bitmap. They will be handled in set_current_options() */
get_posix_options (temp+i);
temp[i+posixopts] = '\0';
return (temp);
}
void
set_current_options (bitmap)
const char *bitmap;
{
int i, v, cv, *on_or_off;
if (bitmap == 0)
return;
for (i = 0; o_options[i].name; i++)
{
v = bitmap[i] ? FLAG_ON : FLAG_OFF;
if (o_options[i].letter)
{
/* We should not get FLAG_UNKNOWN here */
on_or_off = find_flag (o_options[i].letter);
cv = *on_or_off ? FLAG_ON : FLAG_OFF;
if (v != cv)
change_flag (o_options[i].letter, v);
}
else
{
cv = GET_BINARY_O_OPTION_VALUE (i, o_options[i].name);
cv = cv ? FLAG_ON : FLAG_OFF;
if (v != cv)
SET_BINARY_O_OPTION_VALUE (i, v, o_options[i].name);
}
}
/* Now reset the variables changed by posix mode */
set_posix_options (bitmap+i);
}
static int
set_ignoreeof (on_or_off, option_name)
int on_or_off;
char *option_name;
{
ignoreeof = on_or_off == FLAG_ON;
unbind_variable_noref ("ignoreeof");
if (ignoreeof)
bind_variable ("IGNOREEOF", "10", 0);
else
unbind_variable_noref ("IGNOREEOF");
sv_ignoreeof ("IGNOREEOF");
return 0;
}
static int
set_posix_mode (on_or_off, option_name)
int on_or_off;
char *option_name;
{
/* short-circuit on no-op */
if ((on_or_off == FLAG_ON && posixly_correct) ||
(on_or_off == FLAG_OFF && posixly_correct == 0))
return 0;
posixly_correct = on_or_off == FLAG_ON;
if (posixly_correct == 0)
unbind_variable_noref ("POSIXLY_CORRECT");
else
bind_variable ("POSIXLY_CORRECT", "y", 0);
sv_strict_posix ("POSIXLY_CORRECT");
return (0);
}
#if defined (READLINE)
/* Magic. This code `knows' how readline handles rl_editing_mode. */
static int
set_edit_mode (on_or_off, option_name)
int on_or_off;
char *option_name;
{
int isemacs;
if (on_or_off == FLAG_ON)
{
rl_variable_bind ("editing-mode", option_name);
if (interactive)
with_input_from_stdin ();
no_line_editing = 0;
}
else
{
isemacs = rl_editing_mode == 1;
if ((isemacs && *option_name == 'e') || (!isemacs && *option_name == 'v'))
{
if (interactive)
with_input_from_stream (stdin, "stdin");
no_line_editing = 1;
}
}
return 1-no_line_editing;
}
static int
get_edit_mode (name)
char *name;
{
return (*name == 'e' ? no_line_editing == 0 && rl_editing_mode == 1
: no_line_editing == 0 && rl_editing_mode == 0);
}
#endif /* READLINE */
#if defined (HISTORY)
static int
bash_set_history (on_or_off, option_name)
int on_or_off;
char *option_name;
{
if (on_or_off == FLAG_ON)
{
enable_history_list = 1;
bash_history_enable ();
if (history_lines_this_session == 0)
load_history ();
}
else
{
enable_history_list = 0;
bash_history_disable ();
}
return (1 - enable_history_list);
}
#endif
int
set_minus_o_option (on_or_off, option_name)
int on_or_off;
char *option_name;
{
register int i;
i = find_minus_o_option (option_name);
if (i < 0)
{
sh_invalidoptname (option_name);
return (EX_USAGE);
}
if (o_options[i].letter == 0)
{
previous_option_value = GET_BINARY_O_OPTION_VALUE (i, o_options[i].name);
SET_BINARY_O_OPTION_VALUE (i, on_or_off, option_name);
return (EXECUTION_SUCCESS);
}
else
{
if ((previous_option_value = change_flag (o_options[i].letter, on_or_off)) == FLAG_ERROR)
{
sh_invalidoptname (option_name);
return (EXECUTION_FAILURE);
}
else
return (EXECUTION_SUCCESS);
}
}
static void
print_all_shell_variables ()
{
SHELL_VAR **vars;
vars = all_shell_variables ();
if (vars)
{
print_var_list (vars);
free (vars);
}
/* POSIX.2 does not allow function names and definitions to be output when
`set' is invoked without options (PASC Interp #202). */
if (posixly_correct == 0)
{
vars = all_shell_functions ();
if (vars)
{
print_func_list (vars);
free (vars);
}
}
}
void
set_shellopts ()
{
char *value;
char tflag[N_O_OPTIONS];
int vsize, i, vptr, *ip, exported;
SHELL_VAR *v;
for (vsize = i = 0; o_options[i].name; i++)
{
tflag[i] = 0;
if (o_options[i].letter)
{
ip = find_flag (o_options[i].letter);
if (ip && *ip)
{
vsize += strlen (o_options[i].name) + 1;
tflag[i] = 1;
}
}
else if (GET_BINARY_O_OPTION_VALUE (i, o_options[i].name))
{
vsize += strlen (o_options[i].name) + 1;
tflag[i] = 1;
}
}
value = (char *)xmalloc (vsize + 1);
for (i = vptr = 0; o_options[i].name; i++)
{
if (tflag[i])
{
strcpy (value + vptr, o_options[i].name);
vptr += strlen (o_options[i].name);
value[vptr++] = ':';
}
}
if (vptr)
vptr--; /* cut off trailing colon */
value[vptr] = '\0';
v = find_variable ("SHELLOPTS");
/* Turn off the read-only attribute so we can bind the new value, and
note whether or not the variable was exported. */
if (v)
{
VUNSETATTR (v, att_readonly);
exported = exported_p (v);
}
else
exported = 0;
v = bind_variable ("SHELLOPTS", value, 0);
/* Turn the read-only attribute back on, and turn off the export attribute
if it was set implicitly by mark_modified_vars and SHELLOPTS was not
exported before we bound the new value. */
VSETATTR (v, att_readonly);
if (mark_modified_vars && exported == 0 && exported_p (v))
VUNSETATTR (v, att_exported);
free (value);
}
void
parse_shellopts (value)
char *value;
{
char *vname;
int vptr;
vptr = 0;
while (vname = extract_colon_unit (value, &vptr))
{
set_minus_o_option (FLAG_ON, vname);
free (vname);
}
}
void
initialize_shell_options (no_shellopts)
int no_shellopts;
{
char *temp;
SHELL_VAR *var;
if (no_shellopts == 0)
{
var = find_variable ("SHELLOPTS");
/* set up any shell options we may have inherited. */
if (var && imported_p (var))
{
temp = (array_p (var) || assoc_p (var)) ? (char *)NULL : savestring (value_cell (var));
if (temp)
{
parse_shellopts (temp);
free (temp);
}
}
}
/* Set up the $SHELLOPTS variable. */
set_shellopts ();
}
/* Reset the values of the -o options that are not also shell flags. This is
called from execute_cmd.c:initialize_subshell() when setting up a subshell
to run an executable shell script without a leading `#!'. */
void
reset_shell_options ()
{
pipefail_opt = 0;
ignoreeof = 0;
#if defined (STRICT_POSIX)
posixly_correct = 1;
#else
posixly_correct = 0;
#endif
#if defined (HISTORY)
dont_save_function_defs = 0;
remember_on_history = enable_history_list = 1; /* XXX */
#endif
}
/* Set some flags from the word values in the input list. If LIST is empty,
then print out the values of the variables instead. If LIST contains
non-flags, then set $1 - $9 to the successive words of LIST. */
int
set_builtin (list)
WORD_LIST *list;
{
int on_or_off, flag_name, force_assignment, opts_changed, rv, r;
register char *arg;
char s[3];
if (list == 0)
{
print_all_shell_variables ();
return (sh_chkwrite (EXECUTION_SUCCESS));
}
/* Check validity of flag arguments. */
rv = EXECUTION_SUCCESS;
reset_internal_getopt ();
while ((flag_name = internal_getopt (list, optflags)) != -1)
{
switch (flag_name)
{
case 'i': /* don't allow set -i */
s[0] = list_opttype;
s[1] = 'i';
s[2] = '\0';
sh_invalidopt (s);
builtin_usage ();
return (EX_USAGE);
CASE_HELPOPT;
case '?':
builtin_usage ();
return (list_optopt == '?' ? EXECUTION_SUCCESS : EX_USAGE);
default:
break;
}
}
/* Do the set command. While the list consists of words starting with
'-' or '+' treat them as flags, otherwise, start assigning them to
$1 ... $n. */
for (force_assignment = opts_changed = 0; list; )
{
arg = list->word->word;
/* If the argument is `--' or `-' then signal the end of the list
and remember the remaining arguments. */
if (arg[0] == '-' && (!arg[1] || (arg[1] == '-' && !arg[2])))
{
list = list->next;
/* `set --' unsets the positional parameters. */
if (arg[1] == '-')
force_assignment = 1;
/* Until told differently, the old shell behaviour of
`set - [arg ...]' being equivalent to `set +xv [arg ...]'
stands. Posix.2 says the behaviour is marked as obsolescent. */
else
{
change_flag ('x', '+');
change_flag ('v', '+');
opts_changed = 1;
}
break;
}
if ((on_or_off = *arg) && (on_or_off == '-' || on_or_off == '+'))
{
while (flag_name = *++arg)
{
if (flag_name == '?')
{
builtin_usage ();
return (EXECUTION_SUCCESS);
}
else if (flag_name == 'o') /* -+o option-name */
{
char *option_name;
WORD_LIST *opt;
opt = list->next;
if (opt == 0)
{
list_minus_o_opts (-1, (on_or_off == '+'));
rv = sh_chkwrite (rv);
continue;
}
option_name = opt->word->word;
if (option_name == 0 || *option_name == '\0' ||
*option_name == '-' || *option_name == '+')
{
list_minus_o_opts (-1, (on_or_off == '+'));
continue;
}
list = list->next; /* Skip over option name. */
opts_changed = 1;
if ((r = set_minus_o_option (on_or_off, option_name)) != EXECUTION_SUCCESS)
{
set_shellopts ();
return (r);
}
}
else if (change_flag (flag_name, on_or_off) == FLAG_ERROR)
{
s[0] = on_or_off;
s[1] = flag_name;
s[2] = '\0';
sh_invalidopt (s);
builtin_usage ();
set_shellopts ();
return (EXECUTION_FAILURE);
}
opts_changed = 1;
}
}
else
{
break;
}
list = list->next;
}
/* Assigning $1 ... $n */
if (list || force_assignment)
remember_args (list, 1);
/* Set up new value of $SHELLOPTS */
if (opts_changed)
set_shellopts ();
return (rv);
}
#line 830 "./set.def"
#define NEXT_VARIABLE() any_failed++; list = list->next; continue;
int
unset_builtin (list)
WORD_LIST *list;
{
int unset_function, unset_variable, unset_array, opt, nameref, any_failed;
int global_unset_func, global_unset_var, vflags, base_vflags, valid_id;
char *name, *tname;
unset_function = unset_variable = unset_array = nameref = any_failed = 0;
global_unset_func = global_unset_var = 0;
reset_internal_getopt ();
while ((opt = internal_getopt (list, "fnv")) != -1)
{
switch (opt)
{
case 'f':
global_unset_func = 1;
break;
case 'v':
global_unset_var = 1;
break;
case 'n':
nameref = 1;
break;
CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
if (global_unset_func && global_unset_var)
{
builtin_error (_("cannot simultaneously unset a function and a variable"));
return (EXECUTION_FAILURE);
}
else if (unset_function && nameref)
nameref = 0;
#if defined (ARRAY_VARS)
base_vflags = assoc_expand_once ? VA_NOEXPAND : 0;
#endif
while (list)
{
SHELL_VAR *var;
int tem;
#if defined (ARRAY_VARS)
char *t;
#endif
name = list->word->word;
unset_function = global_unset_func;
unset_variable = global_unset_var;
#if defined (ARRAY_VARS)
vflags = builtin_arrayref_flags (list->word, base_vflags);
#endif
#if defined (ARRAY_VARS)
unset_array = 0;
/* XXX valid array reference second arg was 0 */
if (!unset_function && nameref == 0 && tokenize_array_reference (name, vflags, &t))
unset_array = 1;
#endif
/* Get error checking out of the way first. The low-level functions
just perform the unset, relying on the caller to verify. */
valid_id = legal_identifier (name);
/* Whether or not we are in posix mode, if neither -f nor -v appears,
skip over trying to unset variables with invalid names and just
treat them as potential shell function names. */
if (global_unset_func == 0 && global_unset_var == 0 && valid_id == 0)
{
unset_variable = unset_array = 0;
unset_function = 1;
}
/* Bash allows functions with names which are not valid identifiers
to be created when not in posix mode, so check only when in posix
mode when unsetting a function. */
if (unset_function == 0 && valid_id == 0)
{
sh_invalidid (name);
NEXT_VARIABLE ();
}
/* Search for functions here if -f supplied or if NAME cannot be a
variable name. */
var = unset_function ? find_function (name)
: (nameref ? find_variable_last_nameref (name, 0) : find_variable (name));
/* Some variables (but not functions yet) cannot be unset, period. */
if (var && unset_function == 0 && non_unsettable_p (var))
{
builtin_error (_("%s: cannot unset"), name);
NEXT_VARIABLE ();
}
/* if we have a nameref we want to use it */
if (var && unset_function == 0 && nameref == 0 && STREQ (name, name_cell(var)) == 0)
name = name_cell (var);
/* Posix.2 says try variables first, then functions. If we would
find a function after unsuccessfully searching for a variable,
note that we're acting on a function now as if -f were
supplied. The readonly check below takes care of it. */
if (var == 0 && nameref == 0 && unset_variable == 0 && unset_function == 0)
{
if (var = find_function (name))
unset_function = 1;
}
/* Posix.2 says that unsetting readonly variables is an error. */
if (var && readonly_p (var))
{
builtin_error (_("%s: cannot unset: readonly %s"),
var->name, unset_function ? "function" : "variable");
NEXT_VARIABLE ();
}
/* Unless the -f option is supplied, the name refers to a variable. */
#if defined (ARRAY_VARS)
if (var && unset_array)
{
if (shell_compatibility_level <= 51)
vflags |= VA_ALLOWALL;
/* Let unbind_array_element decide what to do with non-array vars */
tem = unbind_array_element (var, t, vflags); /* XXX new third arg */
if (tem == -2 && array_p (var) == 0 && assoc_p (var) == 0)
{
builtin_error (_("%s: not an array variable"), var->name);
NEXT_VARIABLE ();
}
else if (tem < 0)
any_failed++;
}
else
#endif /* ARRAY_VARS */
/* If we're trying to unset a nameref variable whose value isn't a set
variable, make sure we still try to unset the nameref's value */
if (var == 0 && nameref == 0 && unset_function == 0)
{
var = find_variable_last_nameref (name, 0);
if (var && nameref_p (var))
{
#if defined (ARRAY_VARS)
if (valid_array_reference (nameref_cell (var), 0))
{
int len;
tname = savestring (nameref_cell (var));
if (var = array_variable_part (tname, 0, &t, &len))
{
/* change to what unbind_array_element now expects */
if (t[len - 1] == ']')
t[len - 1] = 0;
tem = unbind_array_element (var, t, vflags); /* XXX new third arg */
}
free (tname);
}
else
#endif
tem = unbind_variable (nameref_cell (var));
}
else
tem = unbind_variable (name);
}
else
tem = unset_function ? unbind_func (name) : (nameref ? unbind_nameref (name) : unbind_variable (name));
/* This is what Posix.2 says: ``If neither -f nor -v
is specified, the name refers to a variable; if a variable by
that name does not exist, a function by that name, if any,
shall be unset.'' */
if (tem == -1 && nameref == 0 && unset_function == 0 && unset_variable == 0)
tem = unbind_func (name);
name = list->word->word; /* reset above for namerefs */
/* SUSv3, POSIX.1-2001 say: ``Unsetting a variable or function that
was not previously set shall not be considered an error.'' */
if (unset_function == 0)
stupidly_hack_special_variables (name);
list = list->next;
}
return (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}
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