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/*
* arp-scan is Copyright (C) 2005-2022 Roy Hills
*
* This file is part of arp-scan.
*
* arp-scan 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.
*
* arp-scan 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 arp-scan. If not, see <http://www.gnu.org/licenses/>.
*
* error.c -- error routines for arp-scan
*
* Author: Roy Hills
* Date: 1 December 2001
*/
#include "arp-scan.h"
int daemon_proc; /* Non-zero if process is a daemon */
/*
* Function to handle fatal system call errors.
*/
void
err_sys(const char *fmt,...) {
va_list ap;
va_start(ap, fmt);
err_print(1, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
/*
* Function to handle non-fatal system call errors.
*/
void
warn_sys(const char *fmt,...) {
va_list ap;
va_start(ap, fmt);
err_print(1, fmt, ap);
va_end(ap);
}
/*
* Function to handle fatal errors not from system calls.
*/
void
err_msg(const char *fmt,...) {
va_list ap;
va_start(ap, fmt);
err_print(0, fmt, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
/*
* Function to handle non-fatal errors not from system calls.
*/
void
warn_msg(const char *fmt,...) {
va_list ap;
va_start(ap, fmt);
err_print(0, fmt, ap);
va_end(ap);
}
/*
* General error printing function used by all the above
* functions.
*/
void
err_print (int errnoflag, const char *fmt, va_list ap) {
int n = 0;
size_t size = 0;
int errno_save;
char *buf;
va_list ap_copy;
char *cp;
errno_save=errno;
/*
* Determine required size for the resultant string using copy
* arg ptr.
*/
va_copy(ap_copy, ap);
n = vsnprintf(NULL, 0, fmt, ap_copy);
va_end(ap_copy);
if (n < 0)
return; /* vsnprintf output error */
size = (size_t) n + 1; /* One extra byte for '\0' */
buf = Malloc(size);
vsnprintf(buf, size, fmt, ap);
size=strlen(buf);
cp = buf;
if (errnoflag) {
buf = make_message("%s: %s\n", cp, strerror(errno_save));
} else {
buf = make_message("%s\n", cp);
}
free(cp);
fflush(stdout); /* In case stdout and stderr are the same */
fputs(buf, stderr);
fflush(stderr);
}
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