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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 */