bwrite.c (554B)
1 #include "plan9.h" 2 #include <bio.h> 3 4 long 5 Bwrite(Biobuf *bp, void *ap, long count) 6 { 7 long c; 8 unsigned char *p; 9 int i, n, oc; 10 11 p = ap; 12 c = count; 13 oc = bp->ocount; 14 15 while(c > 0) { 16 n = -oc; 17 if(n > c) 18 n = c; 19 if(n == 0) { 20 if(bp->state != Bwactive) 21 return Beof; 22 i = write(bp->fid, bp->bbuf, bp->bsize); 23 if(i != bp->bsize) { 24 bp->state = Binactive; 25 return Beof; 26 } 27 bp->offset += i; 28 oc = -bp->bsize; 29 continue; 30 } 31 memmove(bp->ebuf+oc, p, n); 32 oc += n; 33 c -= n; 34 p += n; 35 } 36 bp->ocount = oc; 37 return count-c; 38 }