les@unicads.UUCP (Les Milash) (07/14/89)
i have a thing called CScheme, which i love. i have a manual called RRRS. i have a problem. i'm trying to write a program that's c-preprocessor compatable, in that it takes a -I/parameter -I/that/lists/a/bunch -I/of/directories/that include files might be in. so when the code includes foo.h i have to find the first one of /parameter/foo.h /that/lists/a/bunch/foo.h /of/directories/that/foo.h that exists. RRRS talks about (open-input-file "filename") but if the file doesn't exist i get an "out of range with "filename"" error and the program stops. is there a way to figure out if some file exists without crashing? or some way to substitute some better error behaviour (i'd just as soon have it return '() or #!the-you-screwed-up-object or something). i have the CScheme source and am not adverse to making myself un-scheme- compatable (but i imagine that scheme can do what i want somehow (else what good is it?)) thanks in advance for the assistance! Les Milash wow! with a language like this, i might even be able to handle a shared-memory multiprocessor!
cph@ALTDORF.AI.MIT.EDU (Chris Hanson) (07/14/89)
Date: 13 Jul 89 18:36:08 GMT From: Les Milash <unicads!les@boulder.colorado.edu> i have a thing called CScheme, which i love. i have a manual called RRRS. i have a problem. is there a way to figure out if some file exists without crashing? The procedure `file-exists?' does what you want. It takes a single argument which is a filename.
les@unicads.UUCP (Les Milash) (07/15/89)
thanks, everyhody, for telling me about the function `file-exists?'. you can stop now :-) you've been overwhelmingly helpful. ya know, i've never gotten more code working faster than with this wierd Scheme stuff! i guess that's what it's all about, huh?