From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- sys/fio/fnullfile.x | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 sys/fio/fnullfile.x (limited to 'sys/fio/fnullfile.x') diff --git a/sys/fio/fnullfile.x b/sys/fio/fnullfile.x new file mode 100644 index 00000000..4080a03b --- /dev/null +++ b/sys/fio/fnullfile.x @@ -0,0 +1,38 @@ +# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc. + +# FNULLFILE -- Determine if the named file is the null file. + +bool procedure fnullfile (fname) + +char fname[ARB] # null file candidate + +pointer sp, osfn +bool first_time, bval +char nullpath[SZ_FNAME] +int strmatch() +bool streq() + +data first_time /true/ +string nullfile "dev$null" + +begin + # Some simple, fast tests first. + if (streq (fname, nullfile)) + return (true) + else if (strmatch (fname, "{null}") == 0) + return (false) + + call smark (sp) + call salloc (osfn, SZ_PATHNAME, TY_CHAR) + + if (first_time) { + call fpathname (nullfile, nullpath, SZ_FNAME) + first_time = false + } + + call fpathname (fname, Memc[osfn], SZ_PATHNAME) + bval = streq (Memc[osfn], nullpath) + + call sfree (sp) + return (bval) +end -- cgit