163 lines
2.6 KiB
C
163 lines
2.6 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <bio.h>
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static Biobufhdr* wbufs[20];
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static int atexitflag;
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static
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void
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batexit(void)
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{
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Biobufhdr *bp;
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int i;
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for(i=0; i<nelem(wbufs); i++) {
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bp = wbufs[i];
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if(bp != 0) {
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wbufs[i] = 0;
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Bflush(bp);
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}
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}
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}
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static
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void
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deinstall(Biobufhdr *bp)
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{
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int i;
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for(i=0; i<nelem(wbufs); i++)
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if(wbufs[i] == bp)
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wbufs[i] = 0;
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}
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static
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void
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install(Biobufhdr *bp)
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{
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int i;
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deinstall(bp);
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for(i=0; i<nelem(wbufs); i++)
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if(wbufs[i] == 0) {
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wbufs[i] = bp;
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break;
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}
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if(atexitflag == 0) {
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atexitflag = 1;
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atexit(batexit);
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}
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}
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int
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Binits(Biobufhdr *bp, int f, int mode, uint8_t *p, int size)
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{
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p += Bungetsize; /* make room for Bungets */
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size -= Bungetsize;
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switch(mode&~(OCEXEC|ORCLOSE|OTRUNC)) {
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default:
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fprint(2, "Binits: unknown mode %d\n", mode);
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return Beof;
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case OREAD:
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bp->state = Bractive;
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bp->ocount = 0;
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break;
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case OWRITE:
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install(bp);
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bp->state = Bwactive;
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bp->ocount = -size;
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break;
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}
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bp->bbuf = p;
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bp->ebuf = p+size;
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bp->bsize = size;
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bp->icount = 0;
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bp->gbuf = bp->ebuf;
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bp->fid = f;
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bp->flag = 0;
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bp->rdline = 0;
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bp->offset = 0;
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bp->runesize = 0;
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return 0;
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}
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int
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Binit(Biobuf *bp, int f, int mode)
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{
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return Binits(bp, f, mode, bp->b, sizeof(bp->b));
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}
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Biobuf*
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Bfdopen(int fd, int mode)
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{
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Biobuf *bp;
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bp = malloc(sizeof(Biobuf));
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if(bp == nil)
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return nil;
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if(Binits(bp, fd, mode, bp->b, sizeof(bp->b)) != 0){
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free(bp);
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return nil;
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}
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bp->flag = Bmagic; /* mark bp open & malloced */
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setmalloctag(bp, getcallerpc());
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return bp;
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}
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Biobuf*
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Bopen(char *name, int mode)
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{
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Biobuf *bp;
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int f;
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switch(mode&~(OCEXEC|ORCLOSE|OTRUNC)) {
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default:
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fprint(2, "Bopen: unknown mode %#x\n", mode);
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return 0;
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case OREAD:
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f = open(name, mode);
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break;
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case OWRITE:
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f = ocreate(name, mode, 0666);
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break;
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}
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if(f < 0)
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return 0;
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bp = malloc(sizeof(Biobuf));
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Binits(bp, f, mode, bp->b, sizeof(bp->b));
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bp->flag = Bmagic; /* mark bp open & malloced */
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return bp;
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}
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int
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Bterm(Biobufhdr *bp)
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{
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int r;
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deinstall(bp);
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r = Bflush(bp);
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if(bp->flag == Bmagic) {
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bp->flag = 0;
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close(bp->fid);
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bp->fid = -1; /* prevent accidents */
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free(bp);
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}
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/* otherwise opened with Binit(s) */
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return r;
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}
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