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| -rw-r--r-- | builtins/alias.def | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/builtins/alias.def b/builtins/alias.def new file mode 100644 index 0000000..0ab9069 --- /dev/null +++ b/builtins/alias.def @@ -0,0 +1,241 @@ +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 */ |