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-rw-r--r--src/tool_cb_wrt.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/tool_cb_wrt.c b/src/tool_cb_wrt.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+#include <curl/curl.h>
+
+#define ENABLE_CURLX_PRINTF
+/* use our own printf() functions */
+#include "curlx.h"
+
+#include "tool_cfgable.h"
+#include "tool_msgs.h"
+#include "tool_cb_wrt.h"
+
+#include "memdebug.h" /* keep this as LAST include */
+
+/*
+** callback for CURLOPT_WRITEFUNCTION
+*/
+
+size_t tool_write_cb(void *buffer, size_t sz, size_t nmemb, void *userdata)
+{
+ size_t rc;
+ struct OutStruct *out = userdata;
+ struct Configurable *config = out->config;
+
+ /*
+ * Once that libcurl has called back tool_write_cb() the returned value
+ * is checked against the amount that was intended to be written, if
+ * it does not match then it fails with CURLE_WRITE_ERROR. So at this
+ * point returning a value different from sz*nmemb indicates failure.
+ */
+ const size_t err_rc = (sz * nmemb) ? 0 : 1;
+
+ if(!out->stream) {
+ out->bytes = 0; /* nothing written yet */
+ if(!out->filename) {
+ warnf(config, "Remote filename has no length!\n");
+ return err_rc; /* Failure */
+ }
+
+ if(config->content_disposition) {
+ /* don't overwrite existing files */
+ FILE* f = fopen(out->filename, "r");
+ if(f) {
+ fclose(f);
+ warnf(config, "Refusing to overwrite %s: %s\n", out->filename,
+ strerror(EEXIST));
+ return err_rc; /* Failure */
+ }
+ }
+
+ /* open file for writing */
+ out->stream = fopen(out->filename, "wb");
+ if(!out->stream) {
+ warnf(config, "Failed to create the file %s: %s\n", out->filename,
+ strerror(errno));
+ return err_rc; /* failure */
+ }
+ }
+
+ rc = fwrite(buffer, sz, nmemb, out->stream);
+
+ if((sz * nmemb) == rc)
+ /* we added this amount of data to the output */
+ out->bytes += (sz * nmemb);
+
+ if(config->readbusy) {
+ config->readbusy = FALSE;
+ curl_easy_pause(config->easy, CURLPAUSE_CONT);
+ }
+
+ if(config->nobuffer) {
+ /* disable output buffering */
+ int res = fflush(out->stream);
+ if(res) {
+ /* return a value that isn't the same as sz * nmemb */
+ return err_rc; /* failure */
+ }
+ }
+
+ return rc;
+}
+