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Improve url_host_is_ip_address

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svn path=/trunk/netsurf/; revision=10951
This commit is contained in:
Vincent Sanders 2010-11-26 15:36:27 +00:00
parent c14f335454
commit 18196e6692
1 changed files with 17 additions and 27 deletions
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44
utils/url.c
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@ -77,39 +77,29 @@ void url_init(void)
/**
* Check whether a host is an IP address
* Check whether a host string is an IPv4 dotted quad address of the
* format XXX.XXX.XXX.XXX
*
* \param host a hostname terminated by '\0' or '/'
* @todo This *should* be implemented with inet_pton but that requires
* implementing compatability glue for several operating systems.
*
* \param host a hostname terminated by '\0' or '/'
* \return true if the hostname is an IP address, false otherwise
*/
bool url_host_is_ip_address(const char *host) {
int b;
bool n;
unsigned int b1, b2, b3, b4;
unsigned char c;
assert(host);
if (strspn(host, "0123456789.") < strlen(host))
return false;
/* an IP address is of the format XXX.XXX.XXX.XXX, ie totally
* numeric with 3 full stops between the numbers */
b = 0; // number of breaks
n = false; // number present
do {
if (*host == '.') {
if (!n)
return false;
b++;
n = false;
} else if ((*host == '\0') || (*host == '/')) {
if (!n)
return false;
/* todo: check the values are in 0-255 range */
return (b == 3);
} else if (*host < '0' || *host > '9') {
return false;
} else {
n = true;
}
host++;
} while (1);
if (sscanf(host, "%3u.%3u.%3u.%3u%c", &b1, &b2, &b3, &b4, &c) != 4)
return false;
if ((b1 > 255) || (b2 > 255) || (b3 > 255) || (b4 > 255))
return false;
return true;
}
/**