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This file is alias.def, from which is created alias.c
It implements the builtins "alias" and "unalias" in Bash.
Copyright (C) 1987-2020 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
$BUILTIN alias
$FUNCTION alias_builtin
$DEPENDS_ON ALIAS
$PRODUCES alias.c
$SHORT_DOC alias [-p] [name[=value] ... ]
Define or display aliases.
Without arguments, `alias' prints the list of aliases in the reusable
form `alias NAME=VALUE' on standard output.
Otherwise, an alias is defined for each NAME whose VALUE is given.
A trailing space in VALUE causes the next word to be checked for
alias substitution when the alias is expanded.
Options:
-p print all defined aliases in a reusable format
Exit Status:
alias returns true unless a NAME is supplied for which no alias has been
defined.
$END
#include <config.h>
#if defined (ALIAS)
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/types.h>
# endif
# include <unistd.h>
#endif
# include "../bashansi.h"
# include "../bashintl.h"
# include <stdio.h>
# include "../shell.h"
# include "../alias.h"
# include "common.h"
# include "bashgetopt.h"
/* Flags for print_alias */
#define AL_REUSABLE 0x01
static void print_alias PARAMS((alias_t *, int));
/* Hack the alias command in a Korn shell way. */
int
alias_builtin (list)
WORD_LIST *list;
{
int any_failed, offset, pflag, dflags;
alias_t **alias_list, *t;
char *name, *value;
dflags = posixly_correct ? 0 : AL_REUSABLE;
pflag = 0;
reset_internal_getopt ();
while ((offset = internal_getopt (list, "p")) != -1)
{
switch (offset)
{
case 'p':
pflag = 1;
dflags |= AL_REUSABLE;
break;
CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
if (list == 0 || pflag)
{
if (aliases == 0)
return (EXECUTION_SUCCESS);
alias_list = all_aliases ();
if (alias_list == 0)
return (EXECUTION_SUCCESS);
for (offset = 0; alias_list[offset]; offset++)
print_alias (alias_list[offset], dflags);
free (alias_list); /* XXX - Do not free the strings. */
if (list == 0)
return (sh_chkwrite (EXECUTION_SUCCESS));
}
any_failed = 0;
while (list)
{
name = list->word->word;
for (offset = 0; name[offset] && name[offset] != '='; offset++)
;
if (offset && name[offset] == '=')
{
name[offset] = '\0';
value = name + offset + 1;
if (legal_alias_name (name, 0) == 0)
{
builtin_error (_("`%s': invalid alias name"), name);
any_failed++;
}
else
add_alias (name, value);
}
else
{
t = find_alias (name);
if (t)
print_alias (t, dflags);
else
{
sh_notfound (name);
any_failed++;
}
}
list = list->next;
}
return (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}
#endif /* ALIAS */
$BUILTIN unalias
$FUNCTION unalias_builtin
$DEPENDS_ON ALIAS
$SHORT_DOC unalias [-a] name [name ...]
Remove each NAME from the list of defined aliases.
Options:
-a remove all alias definitions
Return success unless a NAME is not an existing alias.
$END
#if defined (ALIAS)
/* Remove aliases named in LIST from the aliases database. */
int
unalias_builtin (list)
register WORD_LIST *list;
{
register alias_t *alias;
int opt, aflag;
aflag = 0;
reset_internal_getopt ();
while ((opt = internal_getopt (list, "a")) != -1)
{
switch (opt)
{
case 'a':
aflag = 1;
break;
CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
if (aflag)
{
delete_all_aliases ();
return (EXECUTION_SUCCESS);
}
if (list == 0)
{
builtin_usage ();
return (EX_USAGE);
}
aflag = 0;
while (list)
{
alias = find_alias (list->word->word);
if (alias)
remove_alias (alias->name);
else
{
sh_notfound (list->word->word);
aflag++;
}
list = list->next;
}
return (aflag ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}
/* Output ALIAS in such a way as to allow it to be read back in. */
static void
print_alias (alias, flags)
alias_t *alias;
int flags;
{
char *value;
value = sh_single_quote (alias->value);
if (flags & AL_REUSABLE)
printf ("alias %s", (alias->name && alias->name[0] == '-') ? "-- " : "");
printf ("%s=%s\n", alias->name, value);
free (value);
fflush (stdout);
}
#endif /* ALIAS */
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