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

2.6 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

curl

CURLOPT_CONV_FROM_UTF8_FUNCTION

libcurl

CURLOPT_CONV_FROM_NETWORK_FUNCTION (3)

CURLOPT_CONV_TO_NETWORK_FUNCTION (3)

NAME

CURLOPT_CONV_FROM_UTF8_FUNCTION - convert data from UTF8 to host encoding

SYNOPSIS

#include <curl/curl.h>

CURLcode conv_callback(char *ptr, size_t length);

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                          conv_callback);

DESCRIPTION

Pass a pointer to your callback function, which should match the prototype shown above.

Applies to non-ASCII platforms. curl_version_info(3) returns the CURL_VERSION_CONV feature bit set if this option is provided.

The data to be converted is in a buffer pointed to by the ptr parameter. The amount of data to convert is indicated by the length parameter. The converted data overlays the input data in the buffer pointed to by the ptr parameter. CURLE_OK must be returned upon successful conversion. A CURLcode return value defined by curl.h, such as CURLE_CONV_FAILED, should be returned if an error was encountered.

CURLOPT_CONV_FROM_UTF8_FUNCTION(3) converts to host encoding from UTF8 encoding. It is required only for SSL processing.

If you set a callback pointer to NULL, or do not set it at all, the built-in libcurl iconv functions are used. If HAVE_ICONV was not defined when libcurl was built, and no callback has been established, the conversion returns the CURLE_CONV_REQD error code.

If HAVE_ICONV is defined, CURL_ICONV_CODESET_OF_HOST must also be defined. For example:

 #define CURL_ICONV_CODESET_OF_HOST "IBM-1047"

The iconv code in libcurl defaults the network and UTF8 codeset names as follows:

#define CURL_ICONV_CODESET_OF_NETWORK "ISO8859-1"

#define CURL_ICONV_CODESET_FOR_UTF8   "UTF-8"

You need to override these definitions if they are different on your system.

DEFAULT

NULL

PROTOCOLS

TLS-based protocols.

EXAMPLE

static CURLcode my_conv_from_utf8_to_ebcdic(char *buffer, size_t length)
{
  int rc = 0;
  /* in-place convert 'buffer' from UTF-8 to EBCDIC */
  if(rc == 0) {
    /* success */
    return CURLE_OK;
  }
  else {
    return CURLE_CONV_FAILED;
  }
}

int main(void)
{
  CURL *curl = curl_easy_init();
  curl_easy_setopt(curl, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                   my_conv_from_utf8_to_ebcdic);
}

AVAILABILITY

Not available and deprecated since 7.82.0.

Available only if CURL_DOES_CONVERSIONS was defined when libcurl was built.

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

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