rb_fopen         1733 io.c               fptr->f = rb_fopen(fname, mode);
rb_fopen         2304 io.c           	fptr->f = rb_fopen(RSTRING(fname)->ptr, mode);
rb_fopen         2834 io.c           		FILE *fr = rb_fopen(fn, "r");
rb_fopen         2856 io.c           			fr = rb_fopen(RSTRING(str)->ptr, "r");
rb_fopen         2878 io.c           		    fw = rb_fopen(fn, "w");