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tool_cb_wrt: fix writing to Windows null device NUL

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- Improve console detection.

Prior to this change WriteConsole could be called to write to a handle
that may not be a console, which would cause an error. This issue is
limited to character devices that are not also consoles such as the null
device NUL.

Bug: https://github.com/curl/curl/issues/3175#issuecomment-439068724
Reported-by: Gisle Vanem
This commit is contained in:
Jay Satiro 2019-03-26 03:31:30 -04:00
parent 2bcdf722b8
commit f5bc578f4c
1 changed files with 6 additions and 1 deletions
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7
src/tool_cb_wrt.c
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@ -79,6 +79,9 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
struct OperationConfig *config = outs->config;
size_t bytes = sz * nmemb;
bool is_tty = config->global->isatty;
#ifdef WIN32
CONSOLE_SCREEN_BUFFER_INFO console_info;
#endif
/*
* Once that libcurl has called back tool_write_cb() the returned value
@ -156,7 +159,9 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
}
#ifdef _WIN32
if(isatty(fileno(outs->stream))) {
if(isatty(fileno(outs->stream)) &&
GetConsoleScreenBufferInfo(
(HANDLE)_get_osfhandle(fileno(outs->stream)), &console_info)) {
DWORD in_len = (DWORD)(sz * nmemb);
wchar_t* wc_buf;
DWORD wc_len;