summaryrefslogtreecommitdiff
path: root/app/bin/validator.c
blob: c415471105307f08c1838c0f14cf4a169324c318 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
/** \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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <stdbool.h>
#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(char *testString)
{
	char *result = testString;
	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);
}