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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/>.
*
* You are encouraged to send comments, improvements or suggestions
* at the github repository https://github.com/royhills/arp-scan
*
* Author: Roy Hills
* Date: 24 October 2022
*
* This file contains output format functions, which were adapted
* from the dpkg Debian package formatting functions in pkg-format.c.
*/
#include "arp-scan.h"
static format_element *
format_element_new(void) {
format_element *buf;
buf = Malloc(sizeof(*buf));
buf->type = FORMAT_INVALID;
buf->next = NULL;
buf->data = NULL;
buf->width = 0;
return buf;
}
static void
parsefield(format_element *node, const char *fmt, const char *fmtend) {
int len;
const char *ws;
len = fmtend - fmt + 1;
ws = memchr(fmt, ';', len);
if (ws) {
char *endptr;
long w;
errno = 0;
w = strtol(ws + 1, &endptr, 0);
if (endptr[0] != '}') {
err_msg("ERROR: incorrect show format: invalid character '%c' in "
"field width", *endptr);
}
if (w < INT_MIN || w > INT_MAX || errno == ERANGE) {
err_msg("ERROR: incorrect show format: field width is out of range");
}
node->width = w;
len = ws - fmt;
}
node->type = FORMAT_FIELD;
node->data = Malloc(len + 1);
memcpy(node->data, fmt, len);
node->data[len] = '\0';
}
static void
parsestring(format_element *node, const char *fmt, const char *fmtend) {
int len;
char *write;
len = fmtend - fmt + 1;
node->type = FORMAT_STRING;
node->data = write = Malloc(len + 1);
while (fmt <= fmtend) {
if (*fmt == '\\') {
fmt++;
switch (*fmt) {
case 'n':
*write = '\n';
break;
case 't':
*write = '\t';
break;
case 'r':
*write = '\r';
break;
case '\\':
default:
*write = *fmt;
break;
}
} else {
*write = *fmt;
}
write++;
fmt++;
}
*write = '\0';
}
format_element *
format_parse(const char *fmt) {
format_element *head, *node;
const char *fmtend;
const char *cp;
head = node = NULL;
while (*fmt) {
if (node)
node = node->next = format_element_new();
else
head = node = format_element_new();
if (fmt[0] == '$' && fmt[1] == '{') { /* Field starting ${ */
fmtend = strchr(fmt, '}'); /* Check for closing brace */
if (!fmtend)
err_msg("ERROR: incorrect show format: missing closing brace");
parsefield(node, fmt + 2, fmtend - 1);
fmt = fmtend + 1;
} else { /* Not a field so presumably a string */
fmtend = fmt;
do {
fmtend += 1;
cp = strchr(fmtend, '$');
if (!cp)
fmtend = strchr(fmtend, '\0');
} while (fmtend[0] && fmtend[1] != '{');
parsestring(node, fmt, fmtend - 1);
fmt = fmtend;
}
}
if (!head)
err_msg("ERROR: output format may not be empty string");
return head;
}
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