+++ /dev/null
-/*
- $Id: buffering_write.c,v 1.2 2004/12/19 01:43:38 rocky Exp $
-
- Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
- Copyright (C) 1998, 1999 Monty <xiphmont@mit.edu>
-
- 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- */
-/* Eliminate teeny little writes. patch submitted by
- Rob Ross <rbross@parl.ces.clemson.edu> --Monty 19991008 */
-
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdio.h>
-
-#define OUTBUFSZ 32*1024
-
-#include "utils.h"
-#include "buffering_write.h"
-
-
-/* GLOBALS FOR BUFFERING CALLS */
-static int bw_fd = -1;
-static long bw_pos = 0;
-static char bw_outbuf[OUTBUFSZ];
-
-
-
-long int
-blocking_write(int outf, char *buffer, long num){
- long int words=0,temp;
-
- while(words<num){
- temp=write(outf,buffer+words,num-words);
- if(temp==-1){
- if(errno!=EINTR && errno!=EAGAIN)
- return(-1);
- temp=0;
- }
- words+=temp;
- }
- return(0);
-}
-
-/** buffering_write() - buffers data to a specified size before writing.
- *
- * Restrictions:
- * - MUST CALL BUFFERING_CLOSE() WHEN FINISHED!!!
- *
- */
-long int
-buffering_write(int fd, char *buffer, long num)
-{
- if (fd != bw_fd) {
- /* clean up after buffering for some other file */
- if (bw_fd >= 0 && bw_pos > 0) {
- if (blocking_write(bw_fd, bw_outbuf, bw_pos)) {
- perror("write (in buffering_write, flushing)");
- }
- }
- bw_fd = fd;
- bw_pos = 0;
- }
-
- if (bw_pos + num > OUTBUFSZ) {
- /* fill our buffer first, then write, then modify buffer and num */
- memcpy(&bw_outbuf[bw_pos], buffer, OUTBUFSZ - bw_pos);
- if (blocking_write(fd, bw_outbuf, OUTBUFSZ)) {
- perror("write (in buffering_write, full buffer)");
- return(-1);
- }
- num -= (OUTBUFSZ - bw_pos);
- buffer += (OUTBUFSZ - bw_pos);
- bw_pos = 0;
- }
- /* save data */
- memcpy(&bw_outbuf[bw_pos], buffer, num);
- bw_pos += num;
-
- return(0);
-}
-
-/** buffering_close() - writes out remaining buffered data before
- * closing file.
- *
- */
-int
-buffering_close(int fd)
-{
- if (fd == bw_fd && bw_pos > 0) {
- /* write out remaining data and clean up */
- if (blocking_write(fd, bw_outbuf, bw_pos)) {
- perror("write (in buffering_close)");
- }
- bw_fd = -1;
- bw_pos = 0;
- }
- return(close(fd));
-}