mirror of
https://github.com/golang/go
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69b74c3953
remove the dependency on /home/r. SVN=122482
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/*
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http://code.google.com/p/inferno-os/source/browse/libbio/brdline.c
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Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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void*
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Brdline(Biobuf *bp, int delim)
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{
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char *ip, *ep;
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int i, j;
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i = -bp->icount;
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if(i == 0) {
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/*
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* eof or other error
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*/
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if(bp->state != Bractive) {
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if(bp->state == Bracteof)
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bp->state = Bractive;
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bp->rdline = 0;
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bp->gbuf = bp->ebuf;
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return 0;
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}
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}
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/*
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* first try in remainder of buffer (gbuf doesn't change)
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*/
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ip = (char*)bp->ebuf - i;
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ep = memchr(ip, delim, i);
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if(ep) {
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j = (ep - ip) + 1;
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bp->rdline = j;
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bp->icount += j;
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return ip;
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}
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/*
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* copy data to beginning of buffer
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*/
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if(i < bp->bsize)
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memmove(bp->bbuf, ip, i);
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bp->gbuf = bp->bbuf;
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/*
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* append to buffer looking for the delim
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*/
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ip = (char*)bp->bbuf + i;
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while(i < bp->bsize) {
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j = read(bp->fid, ip, bp->bsize-i);
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if(j <= 0) {
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/*
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* end of file with no delim
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*/
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memmove(bp->ebuf-i, bp->bbuf, i);
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bp->rdline = i;
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bp->icount = -i;
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bp->gbuf = bp->ebuf-i;
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return 0;
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}
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bp->offset += j;
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i += j;
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ep = memchr(ip, delim, j);
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if(ep) {
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/*
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* found in new piece
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* copy back up and reset everything
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*/
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ip = (char*)bp->ebuf - i;
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if(i < bp->bsize){
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memmove(ip, bp->bbuf, i);
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bp->gbuf = (unsigned char*)ip;
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}
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j = (ep - (char*)bp->bbuf) + 1;
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bp->rdline = j;
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bp->icount = j - i;
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return ip;
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}
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ip += j;
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}
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/*
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* full buffer without finding
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*/
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bp->rdline = bp->bsize;
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bp->icount = -bp->bsize;
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bp->gbuf = bp->bbuf;
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return 0;
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}
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int
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Blinelen(Biobuf *bp)
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{
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return bp->rdline;
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}
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