Import sources from 2011-03-30 iso image

1 files changed, 95 insertions, 0 deletions

diff --git a/sys/src/libbio/brdline.c b/sys/src/libbio/brdline.c
new file mode 100755
index 000000000..c116e3859
--- /dev/null
+++ b/sys/src/libbio/brdline.c
@@ -0,0 +1,95 @@
+#include	<u.h>
+#include	<libc.h>
+#include	<bio.h>
+
+void*
+Brdline(Biobufhdr *bp, int delim)
+{
+	char *ip, *ep;
+	int i, j;
+
+	i = -bp->icount;
+	if(i == 0) {
+		/*
+		 * eof or other error
+		 */
+		if(bp->state != Bractive) {
+			if(bp->state == Bracteof)
+				bp->state = Bractive;
+			bp->rdline = 0;
+			bp->gbuf = bp->ebuf;
+			return 0;
+		}
+	}
+
+	/*
+	 * first try in remainder of buffer (gbuf doesn't change)
+	 */
+	ip = (char*)bp->ebuf - i;
+	ep = memchr(ip, delim, i);
+	if(ep) {
+		j = (ep - ip) + 1;
+		bp->rdline = j;
+		bp->icount += j;
+		return ip;
+	}
+
+	/*
+	 * copy data to beginning of buffer
+	 */
+	if(i < bp->bsize)
+		memmove(bp->bbuf, ip, i);
+	bp->gbuf = bp->bbuf;
+
+	/*
+	 * append to buffer looking for the delim
+	 */
+	ip = (char*)bp->bbuf + i;
+	while(i < bp->bsize) {
+		j = read(bp->fid, ip, bp->bsize-i);
+		if(j <= 0) {
+			/*
+			 * end of file with no delim
+			 */
+			memmove(bp->ebuf-i, bp->bbuf, i);
+			bp->rdline = i;
+			bp->icount = -i;
+			bp->gbuf = bp->ebuf-i;
+			return 0;
+		}
+		bp->offset += j;
+		i += j;
+		ep = memchr(ip, delim, j);
+		if(ep) {
+			/*
+			 * found in new piece
+			 * copy back up and reset everything
+			 */
+			ip = (char*)bp->ebuf - i;
+			if(i < bp->bsize){
+				memmove(ip, bp->bbuf, i);
+				bp->gbuf = (uchar*)ip;
+			}
+			j = (ep - (char*)bp->bbuf) + 1;
+			bp->rdline = j;
+			bp->icount = j - i;
+			return ip;
+		}
+		ip += j;
+	}
+
+	/*
+	 * full buffer without finding
+	 */
+	bp->rdline = bp->bsize;
+	bp->icount = -bp->bsize;
+	bp->gbuf = bp->bbuf;
+	return 0;
+}
+
+int
+Blinelen(Biobufhdr *bp)
+{
+
+	return bp->rdline;
+}