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/* Syntax "detectors"
*
* Copyright 2015 Rainer Gerhards
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include <stdio.h>
#include <stdint.h>
#include "syntaxes.h"
/* returns -1 if no integer found, else integer */
static int64_t
getPosInt(const char *const __restrict__ buf,
const size_t buflen,
size_t *const __restrict__ nprocessed)
{
int64_t val = 0;
size_t i;
for(i = 0 ; i < buflen ; ++i) {
if('0' <= buf[i] && buf[i] <= '9')
val = val*10 + buf[i]-'0';
else
break;
}
*nprocessed = i;
if(i == 0)
val = -1;
return val;
}
/* 1 - is IPv4, 0 not */
int
syntax_ipv4(const char *const __restrict__ buf,
const size_t buflen,
const char *extracted,
size_t *const __restrict__ nprocessed)
{
int64_t val;
size_t nproc;
size_t i;
int r = 0;
val = getPosInt(buf, buflen, &i);
if(val < 1 || val > 255)
goto done;
if(buf[i] != '.') goto done;
i++;
val = getPosInt(buf+i, buflen-i, &nproc);
if(val < 0 || val > 255)
goto done;
i += nproc;
if(buf[i] != '.') goto done;
i++;
val = getPosInt(buf+i, buflen-i, &nproc);
if(val < 0 || val > 255)
goto done;
i += nproc;
if(buf[i] != '.') goto done;
i++;
val = getPosInt(buf+i, buflen-i, &nproc);
if(val < 0 || val > 255)
goto done;
i += nproc;
//printf("IP Addr[%zd]: '%s'\n", i, buf);
*nprocessed = i;
r = 1;
done:
return r;
}
/* 1 - is positive integer, 0 not */
int
syntax_posint(const char *const __restrict__ buf,
const size_t buflen,
const char *extracted,
size_t *const __restrict__ nprocessed)
{
int64_t val;
size_t i;
int r = 0;
val = getPosInt(buf, buflen, &i);
if(val == -1)
goto done;
*nprocessed = i;
r = 1;
done:
return r;
}
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