0c35a965fc
copystring -> strdup. Some int's changed to track_t. But I need to be careful *not* to change cdda_interface.h.
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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$Id: buffering_write.c,v 1.2 2004/12/19 01:43:38 rocky Exp $
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Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
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Copyright (C) 1998, 1999 Monty <xiphmont@mit.edu>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Eliminate teeny little writes. patch submitted by
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Rob Ross <rbross@parl.ces.clemson.edu> --Monty 19991008 */
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#define OUTBUFSZ 32*1024
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#include "utils.h"
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#include "buffering_write.h"
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/* GLOBALS FOR BUFFERING CALLS */
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static int bw_fd = -1;
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static long bw_pos = 0;
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static char bw_outbuf[OUTBUFSZ];
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long int
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blocking_write(int outf, char *buffer, long num){
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long int words=0,temp;
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while(words<num){
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temp=write(outf,buffer+words,num-words);
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if(temp==-1){
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if(errno!=EINTR && errno!=EAGAIN)
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return(-1);
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temp=0;
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}
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words+=temp;
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}
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return(0);
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}
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/** buffering_write() - buffers data to a specified size before writing.
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*
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* Restrictions:
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* - MUST CALL BUFFERING_CLOSE() WHEN FINISHED!!!
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*
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*/
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long int
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buffering_write(int fd, char *buffer, long num)
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{
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if (fd != bw_fd) {
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/* clean up after buffering for some other file */
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if (bw_fd >= 0 && bw_pos > 0) {
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if (blocking_write(bw_fd, bw_outbuf, bw_pos)) {
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perror("write (in buffering_write, flushing)");
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}
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}
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bw_fd = fd;
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bw_pos = 0;
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}
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if (bw_pos + num > OUTBUFSZ) {
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/* fill our buffer first, then write, then modify buffer and num */
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memcpy(&bw_outbuf[bw_pos], buffer, OUTBUFSZ - bw_pos);
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if (blocking_write(fd, bw_outbuf, OUTBUFSZ)) {
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perror("write (in buffering_write, full buffer)");
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return(-1);
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}
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num -= (OUTBUFSZ - bw_pos);
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buffer += (OUTBUFSZ - bw_pos);
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bw_pos = 0;
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}
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/* save data */
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memcpy(&bw_outbuf[bw_pos], buffer, num);
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bw_pos += num;
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return(0);
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}
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/** buffering_close() - writes out remaining buffered data before
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* closing file.
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*
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*/
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int
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buffering_close(int fd)
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{
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if (fd == bw_fd && bw_pos > 0) {
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/* write out remaining data and clean up */
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if (blocking_write(fd, bw_outbuf, bw_pos)) {
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perror("write (in buffering_close)");
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}
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bw_fd = -1;
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bw_pos = 0;
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}
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return(close(fd));
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}
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