ref: 3e0e77a8521331412c96b6371622aa2f76d7aefc
dir: /sys/src/libbio/bwrite.c/
#include <u.h> #include <libc.h> #include <bio.h> long Bwrite(Biobufhdr *bp, void *ap, long count) { long c; uchar *p; int i, n, oc; char errbuf[ERRMAX]; p = ap; c = count; oc = bp->ocount; while(c > 0) { n = -oc; if(n > c) n = c; if(n == 0) { if(bp->state != Bwactive) return Beof; i = write(bp->fid, bp->bbuf, bp->bsize); if(i != bp->bsize) { errstr(errbuf, sizeof errbuf); if(strstr(errbuf, "interrupt") == nil) { bp->state = Binactive; Berror(bp, "write error: %s", errbuf); } errstr(errbuf, sizeof errbuf); return Beof; } bp->offset += i; oc = -bp->bsize; continue; } memmove(bp->ebuf+oc, p, n); oc += n; c -= n; p += n; } bp->ocount = oc; return count-c; }