| #include "lib9.h" |
| #include <bio.h> |
| |
| long |
| Bread(Biobuf *bp, void *ap, long count) |
| { |
| long c; |
| unsigned char *p; |
| int i, n, ic; |
| |
| p = ap; |
| c = count; |
| ic = bp->icount; |
| |
| while(c > 0) { |
| n = -ic; |
| if(n > c) |
| n = c; |
| if(n == 0) { |
| if(bp->state != Bractive) |
| break; |
| i = read(bp->fid, bp->bbuf, bp->bsize); |
| if(i <= 0) { |
| bp->state = Bracteof; |
| if(i < 0) |
| bp->state = Binactive; |
| break; |
| } |
| bp->gbuf = bp->bbuf; |
| bp->offset += i; |
| if(i < bp->bsize) { |
| memmove(bp->ebuf-i, bp->bbuf, i); |
| bp->gbuf = bp->ebuf-i; |
| } |
| ic = -i; |
| continue; |
| } |
| memmove(p, bp->ebuf+ic, n); |
| c -= n; |
| ic += n; |
| p += n; |
| } |
| bp->icount = ic; |
| return count-c; |
| } |