Tor 0.4.9.0-alpha-dev
keyval.c
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1/* Copyright (c) 2003, Roger Dingledine
2 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
3 * Copyright (c) 2007-2021, The Tor Project, Inc. */
4/* See LICENSE for licensing information */
5
6/**
7 * \file keyval.c
8 *
9 * \brief Handle data encoded as a key=value pair.
10 **/
11
12#include "orconfig.h"
13#include "lib/encoding/keyval.h"
14#include "lib/log/escape.h"
15#include "lib/log/log.h"
16#include "lib/log/util_bug.h"
17
18#include <stdlib.h>
19#include <string.h>
20
21/** Return true if <b>string</b> is a valid 'key=[value]' string.
22 * "value" is optional, to indicate the empty string. Log at logging
23 * <b>severity</b> if something ugly happens. */
24int
25string_is_key_value(int severity, const char *string)
26{
27 /* position of equal sign in string */
28 const char *equal_sign_pos = NULL;
29
30 tor_assert(string);
31
32 if (strlen(string) < 2) { /* "x=" is shortest args string */
33 tor_log(severity, LD_GENERAL, "'%s' is too short to be a k=v value.",
34 escaped(string));
35 return 0;
36 }
37
38 equal_sign_pos = strchr(string, '=');
39 if (!equal_sign_pos) {
40 tor_log(severity, LD_GENERAL, "'%s' is not a k=v value.", escaped(string));
41 return 0;
42 }
43
44 /* validate that the '=' is not in the beginning of the string. */
45 if (equal_sign_pos == string) {
46 tor_log(severity, LD_GENERAL, "'%s' is not a valid k=v value.",
47 escaped(string));
48 return 0;
49 }
50
51 return 1;
52}
const char * escaped(const char *s)
Definition: escape.c:126
Header for escape.c.
int string_is_key_value(int severity, const char *string)
Definition: keyval.c:25
Header for keyval.c.
void tor_log(int severity, log_domain_mask_t domain, const char *format,...)
Definition: log.c:591
Headers for log.c.
#define LD_GENERAL
Definition: log.h:62
Macros to manage assertions, fatal and non-fatal.
#define tor_assert(expr)
Definition: util_bug.h:103