# Install bcftools, its manpage, bcf-fix.pl, vcfutils.pl, and new examples.

[samtools.git] / bam_index.c

diff --git a/bam_index.c b/bam_index.c
index 4152f2022f3178ef4fd0ee6b6001effae8f2ce3c..1ad2e93e5051972b084513d5d7391c45c6cf7bf2 100644 (file)
--- a/bam_index.c
+++ b/bam_index.c
@@ -656,17 +656,17 @@ void bam_iter_destroy(bam_iter_t iter)
 
 int bam_iter_read(bamFile fp, bam_iter_t iter, bam1_t *b)
 {
-       if (iter->finished) return -1;
-       if (iter->from_first) {
-               int ret = bam_read1(fp, b);
-               if (ret < 0) iter->finished = 1;
+       int ret;
+       if (iter && iter->finished) return -1;
+       if (iter == 0 || iter->from_first) {
+               ret = bam_read1(fp, b);
+               if (ret < 0 && iter) iter->finished = 1;
                return ret;
        }
        if (iter->off == 0) return -1;
        for (;;) {
-               int ret;
                if (iter->curr_off == 0 || iter->curr_off >= iter->off[iter->i].v) { // then jump to the next chunk
-                       if (iter->i == iter->n_off - 1) break; // no more chunks
+                       if (iter->i == iter->n_off - 1) { ret = -1; break; } // no more chunks
                        if (iter->i >= 0) assert(iter->curr_off == iter->off[iter->i].v); // otherwise bug
                        if (iter->i < 0 || iter->off[iter->i].v != iter->off[iter->i+1].u) { // not adjacent chunks; then seek
                                bam_seek(fp, iter->off[iter->i+1].u, SEEK_SET);
@@ -674,23 +674,27 @@ int bam_iter_read(bamFile fp, bam_iter_t iter, bam1_t *b)
                        }
                        ++iter->i;
                }
-               if ((ret = bam_read1(fp, b)) > 0) {
+               if ((ret = bam_read1(fp, b)) >= 0) {
                        iter->curr_off = bam_tell(fp);
-                       if (b->core.tid != iter->tid || b->core.pos >= iter->end) break; // no need to proceed
+                       if (b->core.tid != iter->tid || b->core.pos >= iter->end) { // no need to proceed
+                               ret = bam_validate1(NULL, b)? -1 : -5; // determine whether end of region or error
+                               break;
+                       }
                        else if (is_overlap(iter->beg, iter->end, b)) return ret;
-               } else break; // end of file
+               } else break; // end of file or error
        }
        iter->finished = 1;
-       return -1;
+       return ret;
 }
 
 int bam_fetch(bamFile fp, const bam_index_t *idx, int tid, int beg, int end, void *data, bam_fetch_f func)
 {
+       int ret;
        bam_iter_t iter;
        bam1_t *b;
        b = bam_init1();
        iter = bam_iter_query(idx, tid, beg, end);
-       while (bam_iter_read(fp, iter, b) >= 0) func(b, data);
+       while ((ret = bam_iter_read(fp, iter, b)) >= 0) func(b, data);
        bam_destroy1(b);
-       return 0;
+       return (ret == -1)? 0 : ret;
 }