+
+int vi_buf_write(struct vi_buffer *vb, const char *path)
+{
+ int i, wbuf_count;
+ struct visor *vi = vb->vi;
+ vi_file *fp;
+ static char wbuf[512];
+
+ if(!path) path = vb->path;
+ if(!path) {
+ vi_error(vi, "failed to write buffer, unknown path\n");
+ return -1;
+ }
+
+ if(!(fp = vi_open(path, VI_WRONLY | VI_CREAT))) {
+ vi_error(vi, "failed to open %s for writing\n", path);
+ return -1;
+ }
+
+ wbuf_count = 0;
+ for(i=0; i<vb->num_spans; i++) {
+ struct vi_span *sp = vb->spans + i;
+ const char *sptxt = vi_buf_span_text(vb, sp);
+ int n, count = 0;
+ while(count < sp->size) {
+ n = sp->size - count;
+ if(n > sizeof wbuf - wbuf_count) {
+ n = sizeof wbuf - wbuf_count;
+ }
+ memcpy(wbuf + wbuf_count, sptxt + count, n);
+ count += n;
+ wbuf_count += n;
+ }
+
+ if(wbuf_count >= sizeof wbuf) {
+ vi_write(fp, wbuf, wbuf_count);
+ }
+ }
+
+ if(wbuf_count > 0) {
+ vi_write(fp, wbuf, wbuf_count);
+ }
+ vi_close(fp);
+ return 0;
+}
+
+long vi_buf_size(struct vi_buffer *vb)
+{
+ int i;
+ long sz = 0;
+
+ for(i=0; i<vb->num_spans; i++) {
+ sz += vb->spans[i].size;
+ }
+ return sz;
+}
+
+struct vi_span *vi_buf_find_span(struct vi_buffer *vb, vi_addr at, vi_addr *soffs)
+{
+ int i;
+ long sz = 0, prev_sz;
+
+ for(i=0; i<vb->num_spans; i++) {
+ prev_sz = sz;
+ sz += vb->spans[i].size;
+ if(sz > at) {
+ if(soffs) *soffs = at - prev_sz;
+ return vb->spans + i;
+ }
+ }
+ return 0;
+}
+
+const char *vi_buf_span_text(struct vi_buffer *vb, struct vi_span *sp)
+{
+ const char *buf = sp->src == SPAN_ORIG ? vb->orig : vb->add;
+ return buf + sp->start;
+}