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

curl_easy_escape

libcurl

curl_easy_unescape (3)

curl_free (3)

NAME

curl_easy_escape - URL encodes the given 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).

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 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.

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 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.

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);
  }
}

AVAILABILITY

Added in 7.15.4 and replaces the old curl_escape(3) function.

RETURN VALUE

A pointer to a null-terminated string or NULL if it failed.

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