26 struct ifile {  struct
27 	struct ifile *h_next;           /* Links for command line list */  argument
28 	struct ifile *h_prev;  argument
44 #define int_ifile(h)    ((struct ifile *)(h))  argument
50 static struct ifile anchor = { &anchor, &anchor, NULL, NULL, NULL, 0, 0, '\0',
54 static void incr_index(struct ifile *p, int incr)  in incr_index()
63 static void link_ifile(struct ifile *p, struct ifile *prev)  in link_ifile()
86 static void unlink_ifile(struct ifile *p)  in unlink_ifile()
100 static struct ifile * new_ifile(constant char *filename, struct ifile *prev)  in new_ifile()
102 	struct ifile *p;  in new_ifile()
107 	p = (struct ifile *) ecalloc(1, sizeof(struct ifile));  in new_ifile()
131 	struct ifile *p;  in del_ifile()
154 	struct ifile *p;  in next_ifile()
167 	struct ifile *p;  in prev_ifile()
178 public IFILE getoff_ifile(IFILE ifile)  in getoff_ifile()  argument
182 	if ((newifile = prev_ifile(ifile)) != NULL_IFILE)  in getoff_ifile()
184 	if ((newifile = next_ifile(ifile)) != NULL_IFILE)  in getoff_ifile()
200 static struct ifile * find_ifile(constant char *filename)  in find_ifile()
202 	struct ifile *p;  in find_ifile()
234 	struct ifile *p;  in get_ifile()
244 public constant char * get_filename(IFILE ifile)  in get_filename()  argument
246 	if (ifile == NULL)  in get_filename()
248 	return (int_ifile(ifile)->h_filename);  in get_filename()
254 public constant char * get_real_filename(IFILE ifile)  in get_real_filename()  argument
256 	if (ifile == NULL)  in get_real_filename()
258 	return (int_ifile(ifile)->h_rfilename);  in get_real_filename()
264 public int get_index(IFILE ifile)  in get_index()  argument
266 	return (int_ifile(ifile)->h_index);   in get_index()
272 public void store_pos(IFILE ifile, struct scrpos *scrpos)  in store_pos()  argument
274 	int_ifile(ifile)->h_scrpos = *scrpos;  in store_pos()
281 public void get_pos(IFILE ifile, struct scrpos *scrpos)  in get_pos()  argument
283 	*scrpos = int_ifile(ifile)->h_scrpos;  in get_pos()
289 public void set_open(IFILE ifile)  in set_open()  argument
291 	int_ifile(ifile)->h_opened = 1;  in set_open()
297 public int opened(IFILE ifile)  in opened()  argument
299 	return (int_ifile(ifile)->h_opened);  in opened()
302 public void hold_ifile(IFILE ifile, int incr)  in hold_ifile()  argument
304 	int_ifile(ifile)->h_hold += incr;  in hold_ifile()
307 public int held_ifile(IFILE ifile)  in held_ifile()  argument
309 	return (int_ifile(ifile)->h_hold);  in held_ifile()
312 public void * get_filestate(IFILE ifile)  in get_filestate()  argument
314 	return (int_ifile(ifile)->h_filestate);  in get_filestate()
317 public void set_filestate(IFILE ifile, void *filestate)  in set_filestate()  argument
319 	int_ifile(ifile)->h_filestate = filestate;  in set_filestate()
322 public void set_altpipe(IFILE ifile, void *p)  in set_altpipe()  argument
324 	int_ifile(ifile)->h_altpipe = p;  in set_altpipe()
327 public void *get_altpipe(IFILE ifile)  in get_altpipe()  argument
329 	return (int_ifile(ifile)->h_altpipe);  in get_altpipe()
332 public void set_altfilename(IFILE ifile, char *altfilename)  in set_altfilename()  argument
334 	struct ifile *p = int_ifile(ifile);  in set_altfilename()
344 public char * get_altfilename(IFILE ifile)  in get_altfilename()  argument
346 	return (int_ifile(ifile)->h_altfilename);  in get_altfilename()
352 	struct ifile *p;