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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, 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 https://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 "tool_setup.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 */
/* create a local file for writing, return TRUE on success */
bool tool_create_output_file(struct OutStruct *outs,
bool append)
{
struct GlobalConfig *global = outs->config->global;
FILE *file;
if(!outs->filename || !*outs->filename) {
warnf(global, "Remote filename has no length!\n");
return FALSE;
}
if(outs->is_cd_filename && !append) {
/* don't overwrite existing files */
file = fopen(outs->filename, "rb");
if(file) {
fclose(file);
warnf(global, "Refusing to overwrite %s: %s\n", outs->filename,
strerror(EEXIST));
return FALSE;
}
}
/* open file for writing */
file = fopen(outs->filename, append?"ab":"wb");
if(!file) {
warnf(global, "Failed to create the file %s: %s\n", outs->filename,
strerror(errno));
return FALSE;
}
outs->s_isreg = TRUE;
outs->fopened = TRUE;
outs->stream = file;
outs->bytes = 0;
outs->init = 0;
return TRUE;
}
/*
** callback for CURLOPT_WRITEFUNCTION
*/
size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
{
size_t rc;
struct OutStruct *outs = userdata;
struct OperationConfig *config = outs->config;
size_t bytes = sz * nmemb;
bool is_tty = config->global->isatty;
/*
* 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 failure = bytes ? 0 : 1;
#ifdef DEBUGBUILD
{
char *tty = curlx_getenv("CURL_ISATTY");
if(tty) {
is_tty = TRUE;
curl_free(tty);
}
}
if(config->show_headers) {
if(bytes > (size_t)CURL_MAX_HTTP_HEADER) {
warnf(config->global, "Header data size exceeds single call write "
"limit!\n");
return failure;
}
}
else {
if(bytes > (size_t)CURL_MAX_WRITE_SIZE) {
warnf(config->global, "Data size exceeds single call write limit!\n");
return failure;
}
}
{
/* Some internal congruency checks on received OutStruct */
bool check_fails = FALSE;
if(outs->filename) {
/* regular file */
if(!*outs->filename)
check_fails = TRUE;
if(!outs->s_isreg)
check_fails = TRUE;
if(outs->fopened && !outs->stream)
check_fails = TRUE;
if(!outs->fopened && outs->stream)
check_fails = TRUE;
if(!outs->fopened && outs->bytes)
check_fails = TRUE;
}
else {
/* standard stream */
if(!outs->stream || outs->s_isreg || outs->fopened)
check_fails = TRUE;
if(outs->alloc_filename || outs->is_cd_filename || outs->init)
check_fails = TRUE;
}
if(check_fails) {
warnf(config->global, "Invalid output struct data for write callback\n");
return failure;
}
}
#endif
if(!outs->stream && !tool_create_output_file(outs, FALSE))
return failure;
if(is_tty && (outs->bytes < 2000) && !config->terminal_binary_ok) {
/* binary output to terminal? */
if(memchr(buffer, 0, bytes)) {
warnf(config->global, "Binary output can mess up your terminal. "
"Use \"--output -\" to tell curl to output it to your terminal "
"anyway, or consider \"--output <FILE>\" to save to a file.\n");
config->synthetic_error = ERR_BINARY_TERMINAL;
return failure;
}
}
rc = fwrite(buffer, sz, nmemb, outs->stream);
if(bytes == rc)
/* we added this amount of data to the output */
outs->bytes += bytes;
if(config->readbusy) {
config->readbusy = FALSE;
curl_easy_pause(config->easy, CURLPAUSE_CONT);
}
if(config->nobuffer) {
/* output buffering disabled */
int res = fflush(outs->stream);
if(res)
return failure;
}
return rc;
}
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