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iconv: add an optional filename argument

--- a/iconv.c

+++ b/iconv.c

@@ -33,7 +33,7 @@

 void

 main(int argc, char **argv)

 {

-	int ci, raw, uncomp;

+	int ci, raw, uncomp, fd;

 	Memimage *a, *b;

 	char *s;

@@ -64,8 +64,15 @@

 		usage();

 	}ARGEND

+	fd = 0;

+	if(argc == 1){

+		if((fd = open(*argv, OREAD)) < 0)

+			sysfatal("%r");

+	}else if(argc != 0)

+		usage();

+

 	memimageinit();

-	if((a = readmemimage(0)) == nil)

+	if((a = readmemimage(fd)) == nil)

 		sysfatal("memory");

 	if(ci >= 0 && a->chan != chans[ci].chan){

 		if((b = allocmemimage(a->r, chans[ci].chan)) == nil)