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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include "stf.h"
# STF_ACCESS -- Test the accessibility or existence of an existing image, or
# the legality of the name of a new image.
procedure stf_access (kernel, root, extn, acmode, status)
int kernel #I IKI kernel
char root[ARB] #I root filename
char extn[ARB] #I extension (SET on output if none specified)
int acmode #I access mode (0 to test only existence)
int status #O return value
int i
pointer sp, fname, kextn
int access(), iki_validextn(), iki_getextn(), btoi()
begin
call smark (sp)
call salloc (fname, SZ_PATHNAME, TY_CHAR)
call salloc (kextn, MAX_LENEXTN, TY_CHAR)
# If new image, test only the legality of the given extension.
# This is used to select a kernel given the imagefile extension.
if (acmode == NEW_IMAGE || acmode == NEW_COPY) {
status = btoi (iki_validextn (kernel, extn) > 0)
call sfree (sp)
return
}
status = NO
# If no extension was given, look for a file with the default
# extension, and return the actual extension if an image with the
# default extension is found.
if (extn[1] == EOS) {
do i = 1, ARB {
if (iki_getextn (kernel, i, Memc[kextn], MAX_LENEXTN) <= 0)
break
call iki_mkfname (root, Memc[kextn], Memc[fname], SZ_PATHNAME)
if (access (Memc[fname], acmode, 0) == YES) {
call strcpy (Memc[kextn], extn, MAX_LENEXTN)
status = YES
break
}
}
} else if (iki_validextn (kernel, extn) == kernel) {
call iki_mkfname (root, extn, Memc[fname], SZ_PATHNAME)
if (access (Memc[fname], acmode, 0) == YES)
status = YES
}
call sfree (sp)
end
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