Tribblix: manual page: curl_easy

curl_easy_escape(3) Introduction to Library Functions curl_easy_escape(3)

NAME

curl_easy_escape - URL encode a string

SYNOPSIS

#include <curl/curl.h>

char *curl_easy_escape(CURL *curl, const char *string, int length);

DESCRIPTION

This function converts the given input string to a URL encoded string
and returns that as a new allocated string. All input characters that
are not a-z, A-Z, 0-9, '-', '.', '_' or '~' are converted to their
"URL escaped" version (%NN where NN is a two-digit hexadecimal
number).

If length is set to 0 (zero), curl_easy_escape(3) uses strlen() on
the input string to find out the size. This function does not accept
input strings longer than CURL_MAX_INPUT_LENGTH (8 MB).

You must curl_free(3) the returned string when you are done with it.

ENCODING

libcurl is typically not aware of, nor does it care about, character
encodings. curl_easy_escape(3) encodes the data byte-by-byte into the
URL encoded version without knowledge or care for what particular
character encoding the application or the receiving server may assume
that the data uses.

The caller of curl_easy_escape(3) must make sure that the data passed
in to the function is encoded correctly.

URLs
URLs are by definition URL encoded. To create a proper URL from a set
of components that may not be URL encoded already, you cannot just
URL encode the entire URL string with curl_easy_escape(3), because it
then also converts colons, slashes and other symbols that you
probably want untouched.

To create a proper URL from strings that are not already URL encoded,
we recommend using libcurl's URL API: set the pieces with
curl_url_set(3) and get the final correct URL with curl_url_get(3).

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
char *output = curl_easy_escape(curl, "data to convert", 15);
if(output) {
printf("Encoded: %s\n", output);
curl_free(output);
}
curl_easy_cleanup(curl);
}
}

HISTORY

Since 7.82.0, the curl parameter is ignored. Prior to that there was
per-handle character conversion support for some old operating
systems such as TPF, but it was otherwise ignored.

AVAILABILITY

Added in curl 7.15.4

RETURN VALUE

A pointer to a null-terminated string or NULL if it failed.