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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysys_priv.h"
#ifdef __WIN__
static int my_coninpfh= 0; /* console input */
#define pthread_auto_mutex_decl(name) \
HANDLE __h##name= NULL; \
char __p##name[sizeof(#name)+16];
#define pthread_auto_mutex_lock(name, proc, time) \
sprintf(__p##name, "%s-%08X", #name, (proc)); \
__h##name= CreateMutex(NULL, FALSE, __p##name); \
WaitForSingleObject(__h##name, (time));
#define pthread_auto_mutex_free(name) \
if (__h##name) \
{ \
ReleaseMutex(__h##name); \
CloseHandle(__h##name); \
}
/*
char* my_cgets(char *string, unsigned long clen, unsigned long* plen)
NOTES
Replaces _cgets from libc to support input of more than 255 chars.
Reads from the console via ReadConsole into buffer which
should be at least clen characters.
Actual length of string returned in plen.
WARNING
my_cgets() does NOT check the pushback character buffer (i.e., _chbuf).
Thus, my_cgets() will not return any character that is pushed back by
the _ungetch() call.
RETURN
string pointer ok
NULL Error
*/
char* my_cgets(char *buffer, unsigned long clen, unsigned long* plen)
{
ULONG state;
char *result;
CONSOLE_SCREEN_BUFFER_INFO csbi;
pthread_auto_mutex_decl(my_conio_mutex);
/* lock the console */
pthread_auto_mutex_lock(my_conio_mutex, GetCurrentProcessId(), INFINITE);
/* init console input */
if (my_coninpfh == 0)
{
/* same handle will be used until process termination */
my_coninpfh= (int)CreateFile("CONIN$", GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
}
if (my_coninpfh == -1)
{
/* unlock the console */
pthread_auto_mutex_free(my_conio_mutex);
return(NULL);
}
GetConsoleMode((HANDLE)my_coninpfh, &state);
SetConsoleMode((HANDLE)my_coninpfh, ENABLE_LINE_INPUT |
ENABLE_PROCESSED_INPUT | ENABLE_ECHO_INPUT);
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
/*
there is no known way to determine allowed buffer size for input
though it is known it should not be more than 64K
so we cut 64K and try first size of screen buffer
if it is still to large we cut half of it and try again
later we may want to cycle from min(clen, 65535) to allowed size
with small decrement to determine exact allowed buffer
*/
clen= min(clen, 65535);
do
{
clen= min(clen, (unsigned long)csbi.dwSize.X*csbi.dwSize.Y);
if (!ReadConsole((HANDLE)my_coninpfh, (LPVOID)buffer, clen - 1, plen, NULL))
{
result= NULL;
clen>>= 1;
}
else
{
result= buffer;
break;
}
}
while (GetLastError() == ERROR_NOT_ENOUGH_MEMORY);
if (result != NULL)
{
if (buffer[*plen - 2] == '\r')
{
*plen= *plen - 2;
}
else
{
if (buffer[*plen - 1] == '\r')
{
char tmp[3];
int tmplen= sizeof(tmp);
*plen= *plen - 1;
/* read /n left in the buffer */
ReadConsole((HANDLE)my_coninpfh, (LPVOID)tmp, tmplen, &tmplen, NULL);
}
}
buffer[*plen]= '\0';
}
SetConsoleMode((HANDLE)my_coninpfh, state);
/* unlock the console */
pthread_auto_mutex_free(my_conio_mutex);
return result;
}
#endif /* __WIN__ */
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