77 lines
2.9 KiB
Groff
77 lines
2.9 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl_easy_unescape 3 "September 07, 2023" "libcurl 8.3.0" "libcurl"
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.SH NAME
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curl_easy_unescape - URL decodes the given string
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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char *curl_easy_unescape(CURL *curl, const char *input,
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int inlength, int *outlength);
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.fi
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.SH DESCRIPTION
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This function converts the URL encoded string \fBinput\fP to a "plain string"
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and returns that in an allocated memory area. All input characters that are URL
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encoded (%XX where XX is a two-digit hexadecimal number) are converted to their
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binary versions.
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If the \fBlength\fP argument is set to 0 (zero), \fIcurl_easy_unescape(3)\fP
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uses strlen() on \fBinput\fP to find out the size.
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If \fBoutlength\fP is non-NULL, the function writes the length of the returned
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string in the integer it points to. This allows proper handling even for
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strings containing %00. Since this is a pointer to an \fIint\fP type, it can
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only return a value up to \fIINT_MAX\fP so no longer string can be returned in
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this parameter.
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Since 7.82.0, the \fBcurl\fP parameter is ignored. Prior to that there was
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per-handle character conversion support for some old operating systems such as
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TPF, but it was otherwise ignored.
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You must \fIcurl_free(3)\fP the returned string when you are done with it.
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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int decodelen;
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char *decoded = curl_easy_unescape(curl, "%63%75%72%6c", 12, &decodelen);
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if(decoded) {
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/* do not assume printf() works on the decoded data! */
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printf("Decoded: ");
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/* ... */
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curl_free(decoded);
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}
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.15.4 and replaces the old \fIcurl_unescape(3)\fP function.
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.SH RETURN VALUE
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A pointer to a null-terminated string or NULL if it failed.
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.SH "SEE ALSO"
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.BR curl_easy_escape "(3), " curl_free "(3)," RFC 3986
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