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curl_easy_escape(3) Library Functions Manual 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). Al- though not constrained by its type, the returned string may not be al- tered. If length is set to 0 (zero), curl_easy_escape(3) uses strlen() on the input string to find out the size. 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 char- acter 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 URL en- code 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. SEE ALSO curl_easy_unescape(3), curl_url_get(3), curl_url_set(3) libcurl 2026-06-11 curl_easy_escape(3)
NAME | SYNOPSIS | DESCRIPTION | ENCODING | URLs | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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