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docs: add CURLOPT type change history, drop casts where present

Some CURLOPT constants defined in the curl public headers were initially
enums (= ints), or macros with bare numeric values. Recent curl releases
upgraded them to `long` constants, to make them pass correctly to
`curl_easy_setop()` by default, i.e. without requiring a `(long)` cast.

This patch drops such casts from the examples embedded in the docs. At
the same time it documents which curl release made them `long` types,
to keep them useful when working with previous libcurl versions.

Also:
- drop a `(long)` cast that was never necessary.
- CURLOPT_ALTSVC_CTRL.md: bump local copy of macros to long.
- test1119: make it ignore symbols ending with an underscore, to skip
  wildcard, e.g. `**CURLAUTH_***`.

Closes #18130

2025-08-02 00:05:33 +02:00

1.6 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

Added-in

curl

CURLOPT_NETRC_FILE

libcurl

CURLOPT_NETRC (3)

CURLOPT_PASSWORD (3)

CURLOPT_USERNAME (3)

All

7.11.0

NAME

CURLOPT_NETRC_FILE - filename to read .netrc info from

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NETRC_FILE, char *file);

DESCRIPTION

Pass a char pointer as parameter, pointing to a null-terminated string containing the full path name to the file you want libcurl to use as .netrc file. If this option is omitted, and CURLOPT_NETRC(3) is set, libcurl checks for a .netrc file in the current user's home directory.

The application does not have to keep the string around after setting this option.

Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again.

DEFAULT

NULL

%PROTOCOLS%

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode ret;
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/");
    curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
    curl_easy_setopt(curl, CURLOPT_NETRC_FILE, "/tmp/magic-netrc");
    ret = curl_easy_perform(curl);
  }
}

HISTORY

CURL_NETRC_* enums became long types in 8.13.0, prior to this version a long cast was necessary when passed to curl_easy_setopt(3).

%AVAILABILITY%

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

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