mirror of
https://github.com/moparisthebest/curl
synced 2024-08-13 17:03:50 -04:00
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/***************************************************************************
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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) 1998 - 2011, 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 http://curl.haxx.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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***************************************************************************/
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#include "setup.h"
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#include <curl/curl.h>
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#define ENABLE_CURLX_PRINTF
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/* use our own printf() functions */
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#include "curlx.h"
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#include "tool_cfgable.h"
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#include "tool_msgs.h"
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#include "tool_cb_wrt.h"
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#include "memdebug.h" /* keep this as LAST include */
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/*
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** callback for CURLOPT_WRITEFUNCTION
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*/
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size_t tool_write_cb(void *buffer, size_t sz, size_t nmemb, void *userdata)
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{
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size_t rc;
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struct OutStruct *out = userdata;
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struct Configurable *config = out->config;
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/*
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* Once that libcurl has called back tool_write_cb() the returned value
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* is checked against the amount that was intended to be written, if
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* it does not match then it fails with CURLE_WRITE_ERROR. So at this
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* point returning a value different from sz*nmemb indicates failure.
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*/
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const size_t err_rc = (sz * nmemb) ? 0 : 1;
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#ifdef DEBUGBUILD
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if(sz * nmemb > (size_t)CURL_MAX_WRITE_SIZE) {
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warnf(config, "Data size exceeds single call write limit!\n");
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return err_rc; /* Failure */
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}
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#endif
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if(!out->stream) {
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out->bytes = 0; /* nothing written yet */
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if(!out->filename) {
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warnf(config, "Remote filename has no length!\n");
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return err_rc; /* Failure */
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}
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if(config->content_disposition) {
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/* don't overwrite existing files */
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FILE* f = fopen(out->filename, "r");
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if(f) {
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fclose(f);
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warnf(config, "Refusing to overwrite %s: %s\n", out->filename,
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strerror(EEXIST));
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return err_rc; /* Failure */
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}
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}
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/* open file for writing */
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out->stream = fopen(out->filename, "wb");
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if(!out->stream) {
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warnf(config, "Failed to create the file %s: %s\n", out->filename,
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strerror(errno));
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return err_rc; /* failure */
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}
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}
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rc = fwrite(buffer, sz, nmemb, out->stream);
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if((sz * nmemb) == rc)
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/* we added this amount of data to the output */
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out->bytes += (sz * nmemb);
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if(config->readbusy) {
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config->readbusy = FALSE;
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curl_easy_pause(config->easy, CURLPAUSE_CONT);
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}
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if(config->nobuffer) {
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/* disable output buffering */
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int res = fflush(out->stream);
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if(res) {
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/* return a value that isn't the same as sz * nmemb */
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return err_rc; /* failure */
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}
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}
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return rc;
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}
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