Fixes bug #12929. Uses my_cgets instead of _cgets function, thus eliminating

a restriction to 255 chars for editable buffer.


VC++Files/mysys/mysys.dsp:
  Added my_conio.c
VC++Files/mysys/mysys_ia64.dsp:
  Added my_conio.c
include/my_sys.h:
  Added declarations for my_conio.c functions
mysys/my_conio.c:
  Added _cgets() replacement that is not limited to 255 chars retrieval
  from win32 console.

1 files changed, 146 insertions, 0 deletions

diff --git a/mysys/my_conio.c b/mysys/my_conio.c
new file mode 100644
index 00000000000..2bf2c1cf1c0
--- /dev/null
+++ b/mysys/my_conio.c
@@ -0,0 +1,146 @@
+/* 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__ */