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curl_easy_escape(3) libcurl Manual curl_easy_escape(3)
curl_easy_escape - URL encodes the given string
char *curl_easy_escape(CURL *curl, const char *string, int length);
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).
Since 7.82.0, the curl parameter is ignored. Prior to that there was
per-handle character conversion support for some very old operating
systems such as TPF, but it was otherwise ignored.
You must curl_free(3) the returned string when you are done with it.
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.
CURL *curl = curl_easy_init();
char *output = curl_easy_escape(curl, "data to convert", 15);
printf("Encoded: %s\n", output);
Added in 7.15.4 and replaces the old curl_escape(3) function.
A pointer to a null-terminated string or NULL if it failed.
curl_easy_unescape(3), curl_free(3), RFC3986
libcurl 7.87.0 September 20, 2022 curl_easy_escape(3)