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| -rw-r--r-- | builtins/command.def | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/builtins/command.def b/builtins/command.def new file mode 100644 index 0000000..acd46cc --- /dev/null +++ b/builtins/command.def @@ -0,0 +1,145 @@ +This file is command.def, from which is created command.c. +It implements the builtin "command" 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/>. + +$PRODUCES command.c + +$BUILTIN command +$FUNCTION command_builtin +$SHORT_DOC command [-pVv] command [arg ...] +Execute a simple command or display information about commands. + +Runs COMMAND with ARGS suppressing shell function lookup, or display +information about the specified COMMANDs. Can be used to invoke commands +on disk when a function with the same name exists. + +Options: + -p use a default value for PATH that is guaranteed to find all of + the standard utilities + -v print a description of COMMAND similar to the `type' builtin + -V print a more verbose description of each COMMAND + +Exit Status: +Returns exit status of COMMAND, or failure if COMMAND is not found. +$END + +#include <config.h> + +#if defined (HAVE_UNISTD_H) +# ifdef _MINIX +# include <sys/types.h> +# endif +# include <unistd.h> +#endif + +#include "../bashansi.h" + +#include "../shell.h" +#include "../execute_cmd.h" +#include "../flags.h" +#include "bashgetopt.h" +#include "common.h" + +#if defined (_CS_PATH) && defined (HAVE_CONFSTR) && !HAVE_DECL_CONFSTR +extern size_t confstr PARAMS((int, char *, size_t)); +#endif + +/* Run the commands mentioned in LIST without paying attention to shell + functions. */ +int +command_builtin (list) + WORD_LIST *list; +{ + int result, verbose, use_standard_path, opt; + COMMAND *command; + + verbose = use_standard_path = 0; + reset_internal_getopt (); + while ((opt = internal_getopt (list, "pvV")) != -1) + { + switch (opt) + { + case 'p': + use_standard_path = CDESC_STDPATH; + break; + case 'V': + verbose = CDESC_SHORTDESC|CDESC_ABSPATH; /* look in common.h for constants */ + break; + case 'v': + verbose = CDESC_REUSABLE; /* ditto */ + break; + CASE_HELPOPT; + default: + builtin_usage (); + return (EX_USAGE); + } + } + list = loptend; + + if (list == 0) + return (EXECUTION_SUCCESS); + +#if defined (RESTRICTED_SHELL) + if (use_standard_path && restricted) + { + sh_restricted ("-p"); + return (EXECUTION_FAILURE); + } +#endif + + if (verbose) + { + int found, any_found; + + for (any_found = 0; list; list = list->next) + { + found = describe_command (list->word->word, verbose|use_standard_path); + + if (found == 0 && verbose != CDESC_REUSABLE) + sh_notfound (list->word->word); + + any_found += found; + } + + return (any_found ? EXECUTION_SUCCESS : EXECUTION_FAILURE); + } + + begin_unwind_frame ("command_builtin"); + +#define COMMAND_BUILTIN_FLAGS (CMD_NO_FUNCTIONS | CMD_INHIBIT_EXPANSION | CMD_COMMAND_BUILTIN | (use_standard_path ? CMD_STDPATH : 0)) + +#ifdef DEBUG + itrace("command_builtin: running execute_command for `%s'", list->word->word); +#endif + + /* We don't want this to be reparsed (consider command echo 'foo &'), so + just make a simple_command structure and call execute_command with it. */ + command = make_bare_simple_command (); + command->value.Simple->words = (WORD_LIST *)copy_word_list (list); + command->value.Simple->redirects = (REDIRECT *)NULL; + command->flags |= COMMAND_BUILTIN_FLAGS; + command->value.Simple->flags |= COMMAND_BUILTIN_FLAGS; + + add_unwind_protect ((char *)dispose_command, command); + result = execute_command (command); + + run_unwind_frame ("command_builtin"); + + return (result); +} |