156 lines
4.1 KiB
Modula-2
156 lines
4.1 KiB
Modula-2
This file is caller.def, from which is created caller.c. It implements the
|
|
builtin "caller" in Bash.
|
|
|
|
Copyright (C) 2002-2008 Rocky Bernstein for Free Software Foundation, Inc.
|
|
Copyright (C) 2008-2013 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 caller.c
|
|
|
|
$BUILTIN caller
|
|
$FUNCTION caller_builtin
|
|
$DEPENDS_ON DEBUGGER
|
|
$SHORT_DOC caller [expr]
|
|
Return the context of the current subroutine call.
|
|
|
|
Without EXPR, returns "$line $filename". With EXPR, returns
|
|
"$line $subroutine $filename"; this extra information can be used to
|
|
provide a stack trace.
|
|
|
|
The value of EXPR indicates how many call frames to go back before the
|
|
current one; the top frame is frame 0.
|
|
|
|
Exit Status:
|
|
Returns 0 unless the shell is not executing a shell function or EXPR
|
|
is invalid.
|
|
$END
|
|
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include "chartypes.h"
|
|
#include "bashtypes.h"
|
|
|
|
#if defined (HAVE_UNISTD_H)
|
|
# ifdef _MINIX
|
|
# include <sys/types.h>
|
|
# endif
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
|
|
#include "../bashintl.h"
|
|
|
|
#include "../shell.h"
|
|
#include "common.h"
|
|
#include "builtext.h"
|
|
#include "bashgetopt.h"
|
|
|
|
#ifdef LOADABLE_BUILTIN
|
|
# include "builtins.h"
|
|
#endif
|
|
|
|
#if !defined (errno)
|
|
extern int errno;
|
|
#endif /* !errno */
|
|
|
|
int
|
|
caller_builtin (list)
|
|
WORD_LIST *list;
|
|
{
|
|
#if !defined (ARRAY_VARS)
|
|
printf ("1 NULL\n");
|
|
return (EXECUTION_FAILURE);
|
|
#else
|
|
SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
|
|
ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
|
|
char *funcname_s, *source_s, *lineno_s;
|
|
intmax_t num;
|
|
|
|
CHECK_HELPOPT (list);
|
|
|
|
GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
|
|
GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
|
|
GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
|
|
|
|
if (bash_lineno_a == 0 || array_empty (bash_lineno_a))
|
|
return (EXECUTION_FAILURE);
|
|
|
|
if (bash_source_a == 0 || array_empty (bash_source_a))
|
|
return (EXECUTION_FAILURE);
|
|
|
|
if (no_options (list))
|
|
return (EX_USAGE);
|
|
list = loptend; /* skip over possible `--' */
|
|
|
|
/* If there is no argument list, then give short form: line filename. */
|
|
if (list == 0)
|
|
{
|
|
lineno_s = array_reference (bash_lineno_a, 0);
|
|
source_s = array_reference (bash_source_a, 1);
|
|
printf("%s %s\n", lineno_s ? lineno_s : "NULL", source_s ? source_s : "NULL");
|
|
return (EXECUTION_SUCCESS);
|
|
}
|
|
|
|
if (funcname_a == 0 || array_empty (funcname_a))
|
|
return (EXECUTION_FAILURE);
|
|
|
|
if (legal_number (list->word->word, &num))
|
|
{
|
|
lineno_s = array_reference (bash_lineno_a, num);
|
|
source_s = array_reference (bash_source_a, num+1);
|
|
funcname_s = array_reference (funcname_a, num+1);
|
|
|
|
if (lineno_s == NULL|| source_s == NULL || funcname_s == NULL)
|
|
return (EXECUTION_FAILURE);
|
|
|
|
printf("%s %s %s\n", lineno_s, funcname_s, source_s);
|
|
}
|
|
else
|
|
{
|
|
sh_invalidnum (list->word->word);
|
|
builtin_usage ();
|
|
return (EX_USAGE);
|
|
}
|
|
|
|
return (EXECUTION_SUCCESS);
|
|
#endif
|
|
}
|
|
|
|
#ifdef LOADABLE_BUILTIN
|
|
static char *caller_doc[] = {
|
|
N_("Returns the context of the current subroutine call.\n\
|
|
\n\
|
|
Without EXPR, returns "$line $filename". With EXPR, returns\n\
|
|
"$line $subroutine $filename"; this extra information can be used to\n\
|
|
provide a stack trace.\n\
|
|
\n\
|
|
The value of EXPR indicates how many call frames to go back before the\n\
|
|
current one; the top frame is frame 0."),
|
|
(char *)NULL
|
|
};
|
|
|
|
struct builtin caller_struct = {
|
|
"caller",
|
|
caller_builtin,
|
|
BUILTIN_ENABLED,
|
|
caller_doc,
|
|
"caller [EXPR]",
|
|
0
|
|
};
|
|
|
|
#endif /* LOADABLE_BUILTIN */
|