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curl_url_get(3) libcurl curl_url_get(3)
NAME
curl_url_get - extract a part from a URL
SYNOPSIS
#include <curl/curl.h>
CURLUcode curl_url_get(const CURLU *url,
CURLUPart part,
char **content,
unsigned int flags);
DESCRIPTION
Given a url handle of a URL object, this function extracts an
individual piece or the full URL from it.
The part argument specifies which part to extract (see list below) and
content points to a 'char *' to get updated to point to a newly
allocated string with the contents.
The flags argument is a bitmask with individual features.
The returned content pointer must be freed with curl_free(3) after use.
FLAGS
The flags argument is zero, one or more bits set in a bitmask.
CURLU_DEFAULT_PORT
If the handle has no port stored, this option makes
curl_url_get(3) return the default port for the used scheme.
CURLU_DEFAULT_SCHEME
If the handle has no scheme stored, this option makes
curl_url_get(3) return the default scheme instead of error.
CURLU_NO_DEFAULT_PORT
Instructs curl_url_get(3) to not return a port number if it
matches the default port for the scheme.
CURLU_URLDECODE
Asks curl_url_get(3) to URL decode the contents before returning
it. It does not decode the scheme, the port number or the full
URL.
The query component also gets plus-to-space conversion as a
bonus when this bit is set.
Note that this URL decoding is charset unaware and you get a
zero terminated string back with data that could be intended for
a particular encoding.
If there are byte values lower than 32 in the decoded string,
the get operation returns an error instead.
CURLU_URLENCODE
If set, curl_url_get(3) URL encodes the host name part when a
CURLU_PUNYCODE
If set and CURLU_URLENCODE is not set, and asked to retrieve the
CURLUPART_HOST or CURLUPART_URL parts, libcurl returns the host
name in its punycode version if it contains any non-ASCII octets
(and is an IDN name).
If libcurl is built without IDN capabilities, using this bit
makes curl_url_get(3) return CURLUE_LACKS_IDN if the host name
contains anything outside the ASCII range.
(Added in curl 7.88.0)
CURLU_PUNY2IDN
If set and asked to retrieve the CURLUPART_HOST or CURLUPART_URL
parts, libcurl returns the host name in its IDN (International
Domain Name) UTF-8 version if it otherwise is a punycode
version. If the punycode name cannot be converted to IDN
correctly, libcurl returns CURLUE_BAD_HOSTNAME.
If libcurl is built without IDN capabilities, using this bit
makes curl_url_get(3) return CURLUE_LACKS_IDN if the host name
is using punycode.
(Added in curl 8.3.0)
PARTS
CURLUPART_URL
When asked to return the full URL, curl_url_get(3) returns a
normalized and possibly cleaned up version using all available
URL parts.
We advise using the CURLU_PUNYCODE option to get the URL as
"normalized" as possible since IDN allows host names to be
written in many different ways that still end up the same
punycode version.
CURLUPART_SCHEME
Scheme cannot be URL decoded on get.
CURLUPART_USER
CURLUPART_PASSWORD
CURLUPART_OPTIONS
The options field is an optional field that might follow the
password in the userinfo part. It is only recognized/used when
parsing URLs for the following schemes: pop3, smtp and imap. The
URL API still allows users to set and get this field
independently of scheme when not parsing full URLs.
CURLUPART_HOST
The host name. If it is an IPv6 numeric address, the zone id is
not part of it but is provided separately in CURLUPART_ZONEID.
IPv6 numerical addresses are returned within brackets ([]).
IPv6 names are normalized when set, which should make them as
short as possible while maintaining correct syntax.
hold a valid port number in ASCII using base 10.
CURLUPART_PATH
The part is always at least a slash ('/') even if no path was
supplied in the URL. A URL path always starts with a slash.
CURLUPART_QUERY
The initial question mark that denotes the beginning of the
query part is a delimiter only. It is not part of the query
contents.
A not-present query returns part set to NULL. A zero-length
query returns part as a zero-length string.
The query part gets pluses converted to space when asked to URL
decode on get with the CURLU_URLDECODE bit.
CURLUPART_FRAGMENT
The initial hash sign that denotes the beginning of the fragment
is a delimiter only. It is not part of the fragment contents.
EXAMPLE
int main(void)
{
CURLUcode rc;
CURLU *url = curl_url();
rc = curl_url_set(url, CURLUPART_URL, "https://example.com", 0);
if(!rc) {
char *scheme;
rc = curl_url_get(url, CURLUPART_SCHEME, &scheme, 0);
if(!rc) {
printf("the scheme is %s\n", scheme);
curl_free(scheme);
}
curl_url_cleanup(url);
}
}
AVAILABILITY
Added in 7.62.0. CURLUPART_ZONEID was added in 7.65.0.
RETURN VALUE
Returns a CURLUcode error value, which is CURLUE_OK (0) if everything
went fine. See the libcurl-errors(3) man page for the full list with
descriptions.
If this function returns an error, no URL part is returned.
SEE ALSO
curl_url(3), curl_url_cleanup(3), curl_url_dup(3), curl_url_set(3),
curl_url_strerror(3), CURLOPT_CURLU(3)
libcurl 8.5.0 December 4, 2023 curl_url_get(3)