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/** \file validator.c
* Validators for misc textformats
*/
/* XTrackCAD - Model Railroad CAD
* Copyright (C) 2019 Martin Fischer
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "validator.h"
/**
* Simplistic checking of URL syntax validity. Checks:
* if scheme is present, it has to be terminated by double /
* hostname has at least 5 characters
*
* \param testString
* \return TRUE if valid, FALSE otherwise
*/
enum URLSCANSTATE { STATE_SCHEME, STATE_ENDOFSCHEME, STATE_HIER, STATE_PATH, STATE_ERROR };
#define MINURLLENGTH 5 /* 2 chars domain name, dot, 2 chars TLD */
bool
IsValidURL(const char *testString)
{
const char *result = testString;
const char *hostname = testString;
enum URLSCANSTATE state = STATE_SCHEME;
if (!*result) {
return(false);
}
while (*result && state != STATE_ERROR) {
switch (*result) {
case ':':
if (state == STATE_SCHEME) {
if (result == testString) {
state = STATE_ERROR;
} else {
state = STATE_ENDOFSCHEME;
}
}
break;
case '/':
if (state == STATE_ENDOFSCHEME) {
if (*(result + 1) == '/') {
state = STATE_HIER;
hostname = result + 2;
result++;
} else {
state = STATE_ERROR;
}
} else {
if (state == STATE_HIER || state == STATE_SCHEME) {
state = STATE_PATH;
if (result - hostname < MINURLLENGTH) {
state = STATE_ERROR;
}
}
}
break;
default:
break;
}
result++;
}
return (state != STATE_ERROR);
}
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