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* libc/stdio/fvwrite.c: Allow writing in larger chunks for fully 

buffered and unbuffered files, to improve write performance.
This commit is contained in:
Corinna Vinschen 2013-11-04 14:18:44 +00:00
parent 5b312b4747
commit 2a98b3363e
2 changed files with 20 additions and 18 deletions
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5
newlib/ChangeLog
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@ -1,3 +1,8 @@
2013-11-04 Terraneo Federico <fede.tft@hotmail.it>
* libc/stdio/fvwrite.c: Allow writing in larger chunks for fully
buffered and unbuffered files, to improve write performance.
2013-10-31 Terraneo Federico <fede.tft@hotmail.it>
* libc/stdio/fvwrite.h: change type of uio_resid from int to size_t to

33
newlib/libc/stdio/fvwrite.c
View File

@ -21,6 +21,7 @@
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include "local.h"
#include "fvwrite.h"
@ -89,12 +90,14 @@ _DEFUN(__sfvwrite_r, (ptr, fp, uio),
if (fp->_flags & __SNBF)
{
/*
* Unbuffered: write up to BUFSIZ bytes at a time.
* Unbuffered: Split buffer in the largest multiple of BUFSIZ < INT_MAX
* as some legacy code may expect int instead of size_t.
*/
do
{
GETIOV (;);
w = fp->_write (ptr, fp->_cookie, p, MIN (len, BUFSIZ));
w = fp->_write (ptr, fp->_cookie, p,
MIN (len, INT_MAX - INT_MAX % BUFSIZ));
if (w <= 0)
goto err;
p += w;
@ -177,29 +180,23 @@ _DEFUN(__sfvwrite_r, (ptr, fp, uio),
fp->_p += w;
w = len; /* but pretend copied all */
}
else if (fp->_p > fp->_bf._base && len > w)
else if (fp->_p > fp->_bf._base || len < fp->_bf._size)
{
/* fill and flush */
/* pass through the buffer */
w = MIN (len, w);
COPY (w);
/* fp->_w -= w; *//* unneeded */
fp->_w -= w;
fp->_p += w;
if (_fflush_r (ptr, fp))
goto err;
}
else if (len >= (w = fp->_bf._size))
{
/* write directly */
w = fp->_write (ptr, fp->_cookie, p, w);
if (w <= 0)
if (fp->_w == 0 && _fflush_r (ptr, fp))
goto err;
}
else
{
/* fill and done */
w = len;
COPY (w);
fp->_w -= w;
fp->_p += w;
/* write directly */
w = ((int)MIN (len, INT_MAX)) / fp->_bf._size * fp->_bf._size;
w = fp->_write (ptr, fp->_cookie, p, w);
if (w <= 0)
goto err;
}
p += w;
len -= w;