vf_sexp_read	1171 src/drv_jtex.c	  if ((s = vf_sexp_read(fp)) ==	NULL)
vf_sexp_read	 254 src/vflibcap.c	  if ((sexp = vf_sexp_read(fp))	== NULL)
vf_sexp_read	  59 src/vflpp.c	while ((s = vf_sexp_read(fp_in)) != NULL){