diff options
Diffstat (limited to 'src/libbio/bread.c')
-rw-r--r-- | src/libbio/bread.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/libbio/bread.c b/src/libbio/bread.c new file mode 100644 index 00000000..0254d017 --- /dev/null +++ b/src/libbio/bread.c @@ -0,0 +1,45 @@ +#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; +} |