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This file is callerdef, from which is created callerc It implements the
builtin "caller" in Bash
Copyright (C) 2002-2003 Rocky Bernstein for 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 2, 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; see the file COPYING If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA
$PRODUCES callerc
$BUILTIN caller
$FUNCTION caller_builtin
$DEPENDS_ON DEBUGGER
$SHORT_DOC caller [EXPR]
Returns the context of the current subroutine call
Without EXPR, returns returns "$line $filename". With EXPR,
returns "$line $subroutine $filename"; this extra information
can be used 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
$END
#include <configh
#include <stdioh
#include "chartypesh"
#include "bashtypesh"
#if defined (HAVE_UNISTD_H)
# ifdef _MINIX
# include <sys/typesh
# endif
# include <unistdh
#endif
#include <errnoh
#include "../bashintlh"
#include "../shellh"
#include "commonh"
#include "builtexth"
#include "bashgetopth"
#ifdef LOADABLE_BUILTIN
# include "builtinsh"
#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;
ARRAY_ELEMENT *ae;
intmax_t num;
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 (EXECUTION_FAILURE);
}
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 returns \"$line $filename\". With EXPR,"),
N_("returns \"$line $subroutine $filename\"; this extra information"),
N_("can be used used to 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 */
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