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Include getpagesize.h.

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(main): Align I/O buffers to page boundaries.
This commit is contained in:
Jim Meyering
2004-04-15 10:52:04 +00:00
parent 0adee504ff
commit 65816f395e
1 changed files with 17 additions and 7 deletions
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src/cat.c
+17 -7
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@@ -33,6 +33,7 @@
#include "system.h"
#include "error.h"
#include "full-write.h"
#include "getpagesize.h"
#include "safe-read.h"
/* The official name of this program (e.g., no `g' prefix). */
@@ -504,6 +505,8 @@ main (int argc, char **argv)
/* Optimal size of i/o operations of input. */
size_t insize;
size_t page_size = getpagesize ();
/* Pointer to the input buffer. */
char *inbuf;
@@ -806,15 +809,16 @@ main (int argc, char **argv)
if (options == 0)
{
insize = max (insize, outsize);
inbuf = xmalloc (insize);
inbuf = xmalloc (insize + page_size - 1);
simple_cat (inbuf, insize);
simple_cat (ptr_align (inbuf, page_size), insize);
}
else
{
inbuf = xmalloc (insize + 1);
inbuf = xmalloc (insize + 1 + page_size - 1);
/* Why are (OUTSIZE - 1 + INSIZE * 4 + LINE_COUNTER_BUF_LEN)
/* Why are
(OUTSIZE - 1 + INSIZE * 4 + LINE_COUNTER_BUF_LEN + PAGE_SIZE - 1)
bytes allocated for the output buffer?
A test whether output needs to be written is done when the input
@@ -829,11 +833,17 @@ main (int argc, char **argv)
options) as the first thing in the output buffer. (Done after the
new input is read, but before processing of the input begins.)
A line number requires seldom more than LINE_COUNTER_BUF_LEN
positions. */
positions.
outbuf = xmalloc (outsize - 1 + insize * 4 + LINE_COUNTER_BUF_LEN);
Align the output buffer to a page size boundary, for efficency on
some paging implementations, so add PAGE_SIZE - 1 bytes to the
request to make room for the alignment. */
cat (inbuf, insize, outbuf, outsize, quote,
outbuf = xmalloc (outsize - 1 + insize * 4 + LINE_COUNTER_BUF_LEN
+ page_size - 1);
cat (ptr_align (inbuf, page_size), insize,
ptr_align (outbuf, page_size), outsize, quote,
output_tabs, numbers, numbers_at_empty_lines, mark_line_ends,
squeeze_empty_lines);