Merge svlasenko@bk-internal.mysql.com:/home/bk/mysql-4.1

into  selena.:H:/MYSQL/src/#12929-mysql-4.1


include/my_sys.h:
  Auto merged

1 files changed, 217 insertions, 0 deletions

diff --git a/mysys/my_conio.c b/mysys/my_conio.c
new file mode 100644
index 00000000000..e381f9f23ef
--- /dev/null
+++ b/mysys/my_conio.c
@@ -0,0 +1,217 @@
+/* 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 HANDLE my_coninpfh= 0;     /* console input */
+
+/*
+  functions my_pthread_auto_mutex_lock & my_pthread_auto_mutex_free
+  are experimental at this moment, they are intended to bring
+  ability of protecting code sections without necessity to explicitly
+  initialize synchronization object in one of threads
+
+  if found useful they are to be exported in mysys
+*/
+
+/*
+  int my_pthread_auto_mutex_lock(HANDLE* ph, const char* name, 
+                                 int id, int time)
+
+  NOTES
+    creates a mutex with given name and tries to lock it time msec.
+    mutex name is appended with id to allow system wide or process wide
+    locks. Handle to created mutex returned in ph argument.
+
+  RETURN
+    0	              thread owns mutex
+    <>0	            error
+
+*/
+static
+int my_pthread_auto_mutex_lock(HANDLE* ph, const char* name, int id, int time)
+{
+  int res;
+  char tname[FN_REFLEN];
+  
+  sprintf(tname, "%s-%08X", name, id);
+  
+  *ph= CreateMutex(NULL, FALSE, tname);
+  if (*ph == NULL)
+    return GetLastError();
+
+  res= WaitForSingleObject(*ph, time);
+  
+  if (res == WAIT_TIMEOUT)
+    return ERROR_SEM_TIMEOUT;
+
+  if (res == WAIT_FAILED)
+    return GetLastError();
+
+  return 0;
+}
+
+/*
+  int my_pthread_auto_mutex_free(HANDLE* ph)
+
+
+  NOTES
+    releases a mutex.
+
+  RETURN
+    0	              thread released mutex
+    <>0	            error
+
+*/
+static
+int my_pthread_auto_mutex_free(HANDLE* ph)
+{
+  if (*ph)
+  {
+    ReleaseMutex(*ph);
+    CloseHandle(*ph);
+    *ph= NULL;
+  }
+
+  return 0;
+}
+
+
+#define pthread_auto_mutex_decl(name)                           \
+  HANDLE __h##name= NULL;
+
+#define pthread_auto_mutex_lock(name, proc, time)               \
+  my_pthread_auto_mutex_lock(&__h##name, #name, (proc), (time))
+
+#define pthread_auto_mutex_free(name)                           \
+  my_pthread_auto_mutex_free(&__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_cs);
+ 
+  /* lock the console for the current process*/
+  if (pthread_auto_mutex_lock(my_conio_cs, GetCurrentProcessId(), INFINITE))
+  {
+    /* can not lock console */
+    pthread_auto_mutex_free(my_conio_cs);  
+    return NULL;
+  }
+
+  /* init console input */
+  if (my_coninpfh == 0)
+  {
+    /* same handle will be used until process termination */
+    my_coninpfh= CreateFile("CONIN$", GENERIC_READ | GENERIC_WRITE,
+                            FILE_SHARE_READ | FILE_SHARE_WRITE,
+                            NULL, OPEN_EXISTING, 0, NULL);
+  }
+
+  if (my_coninpfh == INVALID_HANDLE_VALUE) 
+  {
+    /* unlock the console */
+    pthread_auto_mutex_free(my_conio_cs);  
+    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_cs);  
+
+  return result;
+}
+
+#endif /* __WIN__ */