mirror of https://github.com/curl/curl.git synced 2024-12-09 06:30:06 +08:00

Daniel Stenberg eefcc1bda4

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of leading headers with meta-data
- Supports a small subset of markdown
- Uses .md file extensions for editors/IDE/GitHub to treat them nicely
- Generates man pages very similar to the previous ones
- Generates man pages that still convert nicely to HTML on the website
- Detects and highlights mentions of curl symbols automatically (when
  their man page section is specified)

tools:

- cd2nroff: converts from curldown to nroff man page
- nroff2cd: convert an (old) nroff man page to curldown
- cdall: convert many nroff pages to curldown versions
- cd2cd: verifies and updates a curldown to latest curldown

This setup generates .3 versions of all the curldown versions at build time.

CI:

Since the documentation is now technically markdown in the eyes of many
things, the CI runs many more tests and checks on this documentation,
including proselint, link checkers and tests that make sure we capitalize the
first letter after a period...

Closes #12730

2024-01-23 00:29:02 +01:00

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SPDX-License-Identifier

Title

Section

Source

See-also

curl

CURLOPT_RANGE

libcurl

CURLOPT_LOW_SPEED_LIMIT (3)

CURLOPT_MAXFILESIZE_LARGE (3)

CURLOPT_MAX_RECV_SPEED_LARGE (3)

CURLOPT_RESUME_FROM (3)

NAME

CURLOPT_RANGE - byte range to request

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANGE, char *range);

DESCRIPTION

Pass a char pointer as parameter, which should contain the specified range you want to retrieve. It should be in the format "X-Y", where either X or Y may be left out and X and Y are byte indexes.

HTTP transfers also support several intervals, separated with commas as in "X-Y,N-M". Using this kind of multiple intervals causes the HTTP server to send the response document in pieces (using standard MIME separation techniques). Unfortunately, the HTTP standard (RFC 7233 section 3.1) allows servers to ignore range requests so even when you set CURLOPT_RANGE(3) for a request, you may end up getting the full response sent back.

For RTSP, the formatting of a range should follow RFC 2326 Section 12.29. For RTSP, byte ranges are not permitted. Instead, ranges should be given in npt, utc, or smpte formats.

For HTTP PUT uploads this option should not be used, since it may conflict with other options.

Pass a NULL to this option to disable the use of ranges.

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

DEFAULT

NULL

PROTOCOLS

HTTP, FTP, FILE, RTSP and SFTP.

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* get the first 200 bytes */
    curl_easy_setopt(curl, CURLOPT_RANGE, "0-199");

    /* Perform the request */
    curl_easy_perform(curl);
  }
}

AVAILABILITY

FILE since 7.18.0, RTSP since 7.20.0

RETURN VALUE

Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

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