- fnidx = (char*)calloc(strlen(fn) + 5, 1);
- strcpy(fnidx, fn); strcat(fnidx, ".bai");
- assert(fpidx = fopen(fnidx, "w"));
+ if (_fnidx == 0) {
+ fnidx = (char*)calloc(strlen(fn) + 5, 1);
+ strcpy(fnidx, fn); strcat(fnidx, ".bai");
+ } else fnidx = strdup(_fnidx);
+ fpidx = fopen(fnidx, "w");
+ if (fpidx == 0) {
+ fprintf(stderr, "[bam_index_build2] fail to create the index file.\n");
+ free(fnidx);
+ return 1;
+ }