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_read(): In _O_TEXT mode make Readfile calls in chunks as big as 

possible.
This commit is contained in:
Uwe Bonnes 2003-10-07 03:33:58 +00:00 committed by Alexandre Julliard
parent d1fa4b2d73
commit 6fbcacbb92
1 changed files with 60 additions and 51 deletions
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111
dlls/msvcrt/file.c
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@ -1163,12 +1163,28 @@ int _rmtmp(void)
return num_removed;
}
/*********************************************************************
* (internal) remove_cr
*
* Remove all \r inplace.
* return the number of \r removed
*/
static unsigned int remove_cr(char *buf, unsigned int count)
{
unsigned int i, j;
for (i = 0; i < count; i++) if (buf[i] == '\r') break;
for (j = i + 1; j < count; j++) if (buf[j] != '\r') buf[i++] = buf[j];
return count - i;
}
/*********************************************************************
* _read (MSVCRT.@)
*/
int _read(int fd, void *buf, unsigned int count)
{
DWORD num_read;
DWORD num_read, all_read =0;
char *bufstart = buf;
HANDLE hand = msvcrt_fdtoh(fd);
/* Dont trace small reads, it gets *very* annoying */
@ -1177,56 +1193,49 @@ int _read(int fd, void *buf, unsigned int count)
if (hand == INVALID_HANDLE_VALUE)
return -1;
if (MSVCRT_flags[fd]& _O_BINARY)
{
if (ReadFile(hand, buf, count, &num_read, NULL))
{
if (num_read != count && MSVCRT_files[fd])
{
TRACE(":EOF\n");
MSVCRT_flags[fd] |= MSVCRT__IOEOF;
/*
MSVCRT_files[fd]->_flag |= MSVCRT__IOEOF;
*/
}
TRACE("%s\n",debugstr_an(buf,num_read));
return num_read;
}
TRACE(":failed-last error (%ld)\n",GetLastError());
if (MSVCRT_files[fd])
MSVCRT_files[fd]->_flag |= MSVCRT__IOERR;
return -1;
}
else
{
char cc, *s=(char*)buf,* buf_start=(char*)buf;
unsigned int i;
for (i = 0 , num_read = 1; i < count && (num_read == 1);)
{
if (ReadFile(hand, &cc, 1, &num_read, NULL))
if (num_read == 1)
if ((cc != '\r') || MSVCRT_flags[fd] & _O_BINARY)
{
*s++ = (char)cc;
i++;
}
}
if (num_read != 1)
{
TRACE(":EOF\n");
if (MSVCRT_files[fd])
MSVCRT_flags[fd] |= MSVCRT__IOEOF;
/*
MSVCRT_files[fd]->_flag |= MSVCRT__IOEOF;
*/
}
if (count > 4)
TRACE("%s\n",debugstr_an(buf_start, s-buf_start));
return s-buf_start;
}
return 0;
/* Reading single bytes in O_TEXT mode makes things slow
* So read big chunks, then remove the \r in memory and try reading
* the rest until the request is satisfied or EOF is met
*/
while ( all_read < count)
{
if (ReadFile(hand, bufstart+all_read, count - all_read, &num_read, NULL))
{
if (num_read != (count- all_read))
{
TRACE(":EOF\n");
if ( MSVCRT_files[fd])
{
MSVCRT_flags[fd] |= MSVCRT__IOEOF;
/*
MSVCRT_files[fd]->_flag |= MSVCRT__IOEOF;
*/
}
if ((MSVCRT_flags[fd]& _O_BINARY ) != _O_BINARY )
num_read -= remove_cr(bufstart+all_read,num_read);
all_read += num_read;
if (count > 4)
TRACE("%s\n",debugstr_an(buf,all_read));
return all_read;
}
if ((MSVCRT_flags[fd]& _O_BINARY ) != _O_BINARY )
{
num_read -= remove_cr(bufstart+all_read,num_read);
}
all_read += num_read;
}
else
{
TRACE(":failed-last error (%ld)\n",GetLastError());
if (MSVCRT_files[fd])
MSVCRT_files[fd]->_flag |= MSVCRT__IOERR;
return -1;
}
}
if (count > 4)
TRACE("%s\n",debugstr_an(buf, all_read));
return all_read;
}
/*********************************************************************