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/*
* cook - file construction tool
* Copyright (C) 1997-1999, 2001, 2006, 2007 Peter Miller;
* All rights reserved.
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate errnos
*/
#include <common/ac/errno.h>
#include <common/ac/stdio.h> /* for sprintf */
#include <common/ac/string.h>
#include <pwd.h>
#include <grp.h>
#include <common/ac/unistd.h>
#include <common/str.h>
#include <common/sub/errno.h>
#include <common/sub/private.h>
#include <common/trace.h>
#include <common/wstr_list.h>
/*
* NAME
* sub_errno - the errno substitution
*
* SYNOPSIS
* wstring_ty *sub_errno(wstring_list_ty *arg);
*
* DESCRIPTION
* The sub_errno function implements the errno substitution. The
* errno substitution is replaced by the value if th errno variable
* provided by the system, as mapped through the strerror function.
*
* Requires exactly zero arguments.
*
* The sub_errno_set() function may be used to remember errno,
* and thus isolate the error from subsequest system calls.
*
* ARGUMENTS
* arg - list of arguments, including the function name as [0]
*
* RETURNS
* a pointer to a string in dynamic memory;
* or NULL on error, setting suberr appropriately.
*/
wstring_ty *
sub_errno(sub_context_ty *scp, wstring_list_ty *arg)
{
wstring_ty *result;
trace(("sub_errno()\n{\n"));
if (arg->nitems != 1)
{
sub_context_error_set(scp, i18n("requires zero arguments"));
result = 0;
}
else
{
int n;
n = sub_context_errno_get(scp);
if (n == EPERM || n == EACCES)
{
int uid;
struct passwd *pw;
char uidn[20];
int gid;
struct group *gr;
char gidn[20];
string_ty *s;
uid = geteuid();
pw = getpwuid(uid);
if (pw)
snprintf(uidn, sizeof(uidn), "user \"%.8s\"", pw->pw_name);
else
snprintf(uidn, sizeof(uidn), "uid %d", uid);
gid = getegid();
gr = getgrgid(gid);
if (gr)
snprintf(gidn, sizeof(gidn), "group \"%.8s\"", gr->gr_name);
else
snprintf(gidn, sizeof(gidn), "gid %d", gid);
s = str_format("%s [%s, %s]", strerror(n), uidn, gidn);
result = str_to_wstr(s);
str_free(s);
}
else
result = wstr_from_c(strerror(n));
}
trace(("return %8.8lX;\n", (long)result));
trace(("}\n"));
return result;
}
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